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  Subjects -> ELECTRONICS (Total: 188 journals)
Showing 1 - 200 of 277 Journals sorted alphabetically
Acta Electronica Malaysia     Open Access  
Advances in Electrical and Electronic Engineering     Open Access   (Followers: 7)
Advances in Electronics     Open Access   (Followers: 90)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Power Electronics     Open Access   (Followers: 38)
Advancing Microelectronics     Hybrid Journal  
Aerospace and Electronic Systems, IEEE Transactions on     Hybrid Journal   (Followers: 335)
American Journal of Electrical and Electronic Engineering     Open Access   (Followers: 26)
Annals of Telecommunications     Hybrid Journal   (Followers: 9)
APSIPA Transactions on Signal and Information Processing     Open Access   (Followers: 9)
Archives of Electrical Engineering     Open Access   (Followers: 14)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 30)
Bioelectronics in Medicine     Hybrid Journal  
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 20)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 38)
Biomedical Instrumentation & Technology     Hybrid Journal   (Followers: 6)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 13)
BULLETIN of National Technical University of Ukraine. Series RADIOTECHNIQUE. RADIOAPPARATUS BUILDING     Open Access   (Followers: 1)
Bulletin of the Polish Academy of Sciences : Technical Sciences     Open Access   (Followers: 1)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 47)
China Communications     Full-text available via subscription   (Followers: 9)
Chinese Journal of Electronics     Hybrid Journal  
Circuits and Systems     Open Access   (Followers: 15)
Consumer Electronics Times     Open Access   (Followers: 5)
Control Systems     Hybrid Journal   (Followers: 293)
ECTI Transactions on Computer and Information Technology (ECTI-CIT)     Open Access  
ECTI Transactions on Electrical Engineering, Electronics, and Communications     Open Access  
Edu Elektrika Journal     Open Access   (Followers: 1)
Electrica     Open Access  
Electronic Design     Partially Free   (Followers: 117)
Electronic Markets     Hybrid Journal   (Followers: 7)
Electronic Materials Letters     Hybrid Journal   (Followers: 4)
Electronics     Open Access   (Followers: 97)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 10)
Electronics For You     Partially Free   (Followers: 100)
Electronics Letters     Hybrid Journal   (Followers: 26)
Elkha : Jurnal Teknik Elektro     Open Access  
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 55)
Energy Harvesting and Systems     Hybrid Journal   (Followers: 4)
Energy Storage Materials     Full-text available via subscription   (Followers: 3)
EPJ Quantum Technology     Open Access   (Followers: 1)
EURASIP Journal on Embedded Systems     Open Access   (Followers: 11)
Facta Universitatis, Series : Electronics and Energetics     Open Access  
Foundations and Trends® in Communications and Information Theory     Full-text available via subscription   (Followers: 6)
Foundations and Trends® in Signal Processing     Full-text available via subscription   (Followers: 10)
Frequenz     Hybrid Journal   (Followers: 1)
Frontiers of Optoelectronics     Hybrid Journal   (Followers: 1)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 204)
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 4)
IACR Transactions on Symmetric Cryptology     Open Access  
IEEE Antennas and Propagation Magazine     Hybrid Journal   (Followers: 99)
IEEE Antennas and Wireless Propagation Letters     Hybrid Journal   (Followers: 80)
IEEE Journal of Emerging and Selected Topics in Power Electronics     Hybrid Journal   (Followers: 49)
IEEE Journal of the Electron Devices Society     Open Access   (Followers: 9)
IEEE Journal on Exploratory Solid-State Computational Devices and Circuits     Hybrid Journal   (Followers: 1)
IEEE Power Electronics Magazine     Full-text available via subscription   (Followers: 72)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 71)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 58)
IEEE Transactions on Circuits and Systems for Video Technology     Hybrid Journal   (Followers: 26)
IEEE Transactions on Consumer Electronics     Hybrid Journal   (Followers: 42)
IEEE Transactions on Electron Devices     Hybrid Journal   (Followers: 19)
IEEE Transactions on Information Theory     Hybrid Journal   (Followers: 26)
IEEE Transactions on Power Electronics     Hybrid Journal   (Followers: 78)
IEEE Transactions on Signal and Information Processing over Networks     Full-text available via subscription   (Followers: 12)
IEICE - Transactions on Electronics     Full-text available via subscription   (Followers: 12)
IEICE - Transactions on Information and Systems     Full-text available via subscription   (Followers: 5)
IET Cyber-Physical Systems : Theory & Applications     Open Access   (Followers: 1)
IET Energy Systems Integration     Open Access  
IET Microwaves, Antennas & Propagation     Hybrid Journal   (Followers: 35)
IET Nanodielectrics     Open Access  
IET Power Electronics     Hybrid Journal   (Followers: 55)
IET Smart Grid     Open Access  
IET Wireless Sensor Systems     Hybrid Journal   (Followers: 18)
IETE Journal of Education     Open Access   (Followers: 4)
IETE Journal of Research     Open Access   (Followers: 11)
IETE Technical Review     Open Access   (Followers: 13)
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)     Open Access   (Followers: 3)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 70)
Industrial Technology Research Journal Phranakhon Rajabhat University     Open Access  
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 35)
Informatik-Spektrum     Hybrid Journal   (Followers: 2)
Instabilities in Silicon Devices     Full-text available via subscription   (Followers: 1)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 13)
International Journal of Advanced Research in Computer Science and Electronics Engineering     Open Access   (Followers: 18)
International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems     Open Access   (Followers: 11)
International Journal of Antennas and Propagation     Open Access   (Followers: 11)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 4)
International Journal of Computational Vision and Robotics     Hybrid Journal   (Followers: 6)
International Journal of Control     Hybrid Journal   (Followers: 11)
International Journal of Electronics     Hybrid Journal   (Followers: 7)
International Journal of Electronics and Telecommunications     Open Access   (Followers: 13)
International Journal of Granular Computing, Rough Sets and Intelligent Systems     Hybrid Journal   (Followers: 3)
International Journal of High Speed Electronics and Systems     Hybrid Journal  
International Journal of Hybrid Intelligence     Hybrid Journal  
International Journal of Image, Graphics and Signal Processing     Open Access   (Followers: 16)
International Journal of Microwave and Wireless Technologies     Hybrid Journal   (Followers: 10)
International Journal of Nanoscience     Hybrid Journal   (Followers: 1)
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields     Hybrid Journal   (Followers: 4)
International Journal of Power Electronics     Hybrid Journal   (Followers: 25)
International Journal of Review in Electronics & Communication Engineering     Open Access   (Followers: 4)
International Journal of Sensors, Wireless Communications and Control     Hybrid Journal   (Followers: 10)
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 4)
International Journal of Wireless and Microwave Technologies     Open Access   (Followers: 6)
International Transaction of Electrical and Computer Engineers System     Open Access   (Followers: 2)
JAREE (Journal on Advanced Research in Electrical Engineering)     Open Access  
Journal of Biosensors & Bioelectronics     Open Access   (Followers: 3)
Journal of Advanced Dielectrics     Open Access   (Followers: 1)
Journal of Artificial Intelligence     Open Access   (Followers: 11)
Journal of Circuits, Systems, and Computers     Hybrid Journal   (Followers: 4)
Journal of Computational Intelligence and Electronic Systems     Full-text available via subscription   (Followers: 1)
Journal of Electrical and Electronics Engineering Research     Open Access   (Followers: 32)
Journal of Electrical Bioimpedance     Open Access  
Journal of Electrical Bioimpedance     Open Access   (Followers: 2)
Journal of Electrical Engineering & Electronic Technology     Hybrid Journal   (Followers: 7)
Journal of Electrical, Electronics and Informatics     Open Access  
Journal of Electromagnetic Analysis and Applications     Open Access   (Followers: 8)
Journal of Electromagnetic Waves and Applications     Hybrid Journal   (Followers: 9)
Journal of Electronic Design Technology     Full-text available via subscription   (Followers: 6)
Journal of Electronics (China)     Hybrid Journal   (Followers: 5)
Journal of Energy Storage     Full-text available via subscription   (Followers: 4)
Journal of Engineered Fibers and Fabrics     Open Access   (Followers: 2)
Journal of Field Robotics     Hybrid Journal   (Followers: 3)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 173)
Journal of Information and Telecommunication     Open Access   (Followers: 1)
Journal of Intelligent Procedures in Electrical Technology     Open Access   (Followers: 3)
Journal of Low Power Electronics     Full-text available via subscription   (Followers: 10)
Journal of Low Power Electronics and Applications     Open Access   (Followers: 10)
Journal of Microelectronics and Electronic Packaging     Hybrid Journal  
Journal of Microwave Power and Electromagnetic Energy     Hybrid Journal   (Followers: 3)
Journal of Microwaves, Optoelectronics and Electromagnetic Applications     Open Access   (Followers: 11)
Journal of Nuclear Cardiology     Hybrid Journal  
Journal of Optoelectronics Engineering     Open Access   (Followers: 4)
Journal of Physics B: Atomic, Molecular and Optical Physics     Hybrid Journal   (Followers: 29)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 11)
Journal of Semiconductors     Full-text available via subscription   (Followers: 5)
Journal of Sensors     Open Access   (Followers: 26)
Journal of Signal and Information Processing     Open Access   (Followers: 9)
Jurnal ELTIKOM : Jurnal Teknik Elektro, Teknologi Informasi dan Komputer     Open Access  
Jurnal Rekayasa Elektrika     Open Access  
Jurnal Teknik Elektro     Open Access  
Jurnal Teknologi Elektro     Open Access  
Kinetik : Game Technology, Information System, Computer Network, Computing, Electronics, and Control     Open Access  
Learning Technologies, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Magnetics Letters, IEEE     Hybrid Journal   (Followers: 7)
Majalah Ilmiah Teknologi Elektro : Journal of Electrical Technology     Open Access   (Followers: 2)
Metrology and Measurement Systems     Open Access   (Followers: 6)
Microelectronics and Solid State Electronics     Open Access   (Followers: 27)
Nanotechnology Magazine, IEEE     Full-text available via subscription   (Followers: 41)
Nanotechnology, Science and Applications     Open Access   (Followers: 6)
Nature Electronics     Hybrid Journal   (Followers: 1)
Networks: an International Journal     Hybrid Journal   (Followers: 5)
Open Electrical & Electronic Engineering Journal     Open Access  
Open Journal of Antennas and Propagation     Open Access   (Followers: 9)
Optical Communications and Networking, IEEE/OSA Journal of     Full-text available via subscription   (Followers: 15)
Paladyn. Journal of Behavioral Robotics     Open Access   (Followers: 1)
Power Electronics and Drives     Open Access   (Followers: 2)
Problemy Peredachi Informatsii     Full-text available via subscription  
Progress in Quantum Electronics     Full-text available via subscription   (Followers: 7)
Pulse     Full-text available via subscription   (Followers: 5)
Radiophysics and Quantum Electronics     Hybrid Journal   (Followers: 2)
Recent Advances in Communications and Networking Technology     Hybrid Journal   (Followers: 3)
Recent Advances in Electrical & Electronic Engineering     Hybrid Journal   (Followers: 9)
Research & Reviews : Journal of Embedded System & Applications     Full-text available via subscription   (Followers: 5)
Revue Méditerranéenne des Télécommunications     Open Access  
Security and Communication Networks     Hybrid Journal   (Followers: 2)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 56)
Semiconductors and Semimetals     Full-text available via subscription   (Followers: 1)
Sensing and Imaging : An International Journal     Hybrid Journal   (Followers: 2)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 4)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 78)
Solid State Electronics Letters     Open Access  
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 13)
Solid-State Electronics     Hybrid Journal   (Followers: 9)
Superconductor Science and Technology     Hybrid Journal   (Followers: 3)
Synthesis Lectures on Power Electronics     Full-text available via subscription   (Followers: 3)
Technical Report Electronics and Computer Engineering     Open Access  
TELE     Open Access  
Telematique     Open Access  
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)     Open Access   (Followers: 9)
Transactions on Electrical and Electronic Materials     Hybrid Journal  
Universal Journal of Electrical and Electronic Engineering     Open Access   (Followers: 6)
Ural Radio Engineering Journal     Open Access  
Visión Electrónica : algo más que un estado sólido     Open Access   (Followers: 1)
Wireless and Mobile Technologies     Open Access   (Followers: 6)
Wireless Power Transfer     Full-text available via subscription   (Followers: 4)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 11)
Електротехніка і Електромеханіка     Open Access  

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Similar Journals
Journal Cover
IEEE Antennas and Wireless Propagation Letters
Journal Prestige (SJR): 1.047
Citation Impact (citeScore): 4
Number of Followers: 80  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1536-1225
Published by IEEE Homepage  [191 journals]
  • IEEE Antennas and Wireless Propagation Letters
    • PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Efficient Electromagnetic Analysis for Complex Planar Thin-Layer Composite
           Objects by a Hybrid Method
    • Authors: Xianjin Li;Lin Lei;Yongpin Chen;Ming Jiang;Zaiping Nie;Jun Hu;
      Pages: 1706 - 1710
      Abstract: The previously developed volume-surface integral equation-based domain decomposition method (VSIE-DDM) generally requires huge matrix filling time. To alleviate this issue, the equivalent dipole-moment (EDM) method is applied to the VSIE-DDM for complex electricallylarge planar thin-layer composite objects. Therefore, an efficient hybrid VSIE-DDM-EDM method is developed, in which the EDM technique remarkably saves the calculation time of the VSIE-DDM matrix. In this hybrid method, a new simplified prism vector basis-based dipole model is proposed. Compared with the Schaubert–Wilton–Glisson basis-based dipole model, the proposed model significantly reduces the number of numerical integrations within the threshold for planar thin dielectrics. Furthermore, to ensure the flexibility of the solution for a variety of electromagnetic problems, two strategies for solving equations (inner–outer iteration scheme and direct-iterative hybrid method) are, respectively, adopted. Finally, the multilevel fast multipole algorithm (MLFMA) is utilized for iteration procedure. Numerical examples are shown to validate the accuracy and efficiency of the proposed method.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • An Accurate Three-Dimensional FDTD(2,4) Method on Face-Centered Cubic
           Grids With Low Numerical Dispersion
    • Authors: Guangzhi Chen;Shunchuan Yang;Donglin Su;
      Pages: 1711 - 1715
      Abstract: In this letter, a three-dimensional finite-difference time-domain (FDTD) method that is second-order in time and fourth-order in space on a face-centered cubic (FCC) grid, termed as FCC-FDTD(2,4), is proposed to solve the time-domain Maxwell's equations. The proposed method shows a much lower numerical dispersion error compared with the errors of other FDTD schemes, such as the FCC-FDTD(2,2) method, the FDTD(2,2) method, and the FDTD(2,4) method. This improvement in the numerical dispersion results from the FCC grid and the fourth-order scheme in space used in the proposed FCC-FDTD(2,4) method. Then, the Courant–Friedrichs–Lewy condition is given through spectral analysis, and an analytical numerical dispersion relation is obtained and comprehensively studied through numerical results with the FCC-FDTD(2,2) method, the FDTD(2,2) method, and the FDTD(2,4) method. Compared with the other three FDTD methods, the proposed method has much smaller numerical dispersion errors. Finally, the accuracy of the proposed method is further validated with other numerical examples.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Experimental Study on a Modified Method for Propagation
           Delay of Long Wave Signal
    • Authors: Yun Li;Yu Hua;Baorong Yan;Wei Guo;
      Pages: 1716 - 1720
      Abstract: The propagation of a long wave signal is influenced by many factors, such as topography, geology, and weather. How to get the accuracy signal propagation delay has always been the bottleneck restricting the realization of high-precision timing of a long wave system. Now, there are two methods to obtain the signal delay, the calculation and the measurement. The error of the calculation value is caused by the propagation path condition including of topography, geology, and weather. For users in a range, the conditions are similar on the path, and there is the correlation in the error. The relevance of the error is analyzed in theory, and a correction method of signal propagation delay is proposed. Similar to the local area differential Global Position System (GPS), in the reference station, we measure time delay, calculate the error, and send to users. The users around the reference station receive the value and modify the calculation value to get the accuracy delay. The results show that it can effectively improve the accuracy of propagation delay. For the users, the closer it is to the differential station, the higher the correction accuracy is. For the reference stations, if it is farther away from the transmitter, the users’ correction accuracy around it will be higher than others users around with the same distance.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Design of a Compact Multielement Monopulse Feed for Ground-Station
           Satellite Tracking Applications
    • Authors: Sandip Sankar Roy;Chinmoy Saha;Tammana Nagasekhar;Sandesh Bhimrao Mane;C. S. Padmavathy;G. Umadevi;Mallenahalli Naresh Kumar;
      Pages: 1721 - 1725
      Abstract: This letter presents design and realization of a five-element compact dual-polarized feed for a 4.5 m Cassegrain ground-station reflector antenna. The realized monopulse feed is being used to track remote sensing satellites and receive imagery data in X-band frequencies (8–8.5 GHz). The multielement feed consists of one large-aperture corrugated horn acting as main element to extract the communication (sum port) signal and four side-launched circular waveguide elements around the central corrugated horn acting as tracking elements by extracting error signals in both azimuth and elevation. Various design issues of five-element communication/tracking feed assembly are presented along with simulation and measured results. The designed feed assembly satisfies the gain requirements of sum-and-difference pattern and serves as the most simple and compact design.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • A Wideband Dual-Circular-Polarization Horn Antenna for mmWave Wireless
    • Authors: Chao Shu;Junbo Wang;Shaoqing Hu;Yuan Yao;Junsheng Yu;Yasir Alfadhl;Xiaodong Chen;
      Pages: 1726 - 1730
      Abstract: This letter presents our design and experimental verification of a wideband dual-circular-polarized antenna operating in the W-band based on an optimized waveguide septum polarizer and a profiled smooth-wall horn. This antenna is capable of transmitting and receiving two orthogonal circular-polarized signals [left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP)] simultaneously to achieve full-duplex, hence, twofold spectrum efficiency for millimeter-wave (mmWave) wireless communications. The fabricated antenna shows 21% relative bandwidth from 76.8 to 94.7 GHz with axial ratio 20 dB for both LHCP and RHCP.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • An Overlapping Domain Decomposition Method Based on Calderón
           Preconditioned CFIE
    • Authors: Guang-Yu Zhu;Hou-Xing Zhou;Wei Hong;
      Pages: 1731 - 1735
      Abstract: In this letter, an overlapping domain decomposition method (ODDM) based on the Calderón preconditioned combined field integral equation (CP-CFIE) is proposed. In contrast to previous ODDM using the combined field integral equation (CFIE), the proposed method possesses excellent robustness in the case of multiscale discretization. Several numerical examples are provided to demonstrate the correctness and performance of the proposed method.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Dual-Polarized Planar Phased Array Antenna With Cavity-Backed Elements
    • Authors: Peng Zhang;Shi-Wei Qu;Shiwen Yang;
      Pages: 1736 - 1740
      Abstract: A planar dual-polarized phased array antenna with cavity-backed elements is proposed in this letter. The array antenna is designed based on a dual-polarized patch antenna element with vertical orthogonal baluns. The antenna element is backed by a compact cavity to reduce the interelement mutual coupling and enhance the scanning performance of the planar array. The proposed array achieves a wide fractional bandwidth of over 20% when scanning up to ±45° in the E- and H-planes. The isolation between the two orthogonal ports in the same element is higher than 30 dB. The validity of a design is verified by simulation and measurements of a 10 × 10 array prototype.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Range-Angle-Dependent Beampattern Synthesis With Null Depth Control for
           Joint Radar Communication
    • Authors: Abdul Basit;Wen-Qin Wang;Shaddrack Yaw Nusenu;Shunsheng Zhang;
      Pages: 1741 - 1745
      Abstract: In this letter, we present an analytical method to design a range-angle-dependent beampattern using frequency diverse array (FDA) with null depth control (NDC) for joint radar and communication applications. A slow time-dependent nonuniform frequency offset is used to lock the phase of transmitted signal at a specific time instant to achieve the objective. Moreover, we introduce range-angle-dependent NDC for the joint radar and communication functionalities. That is, we design two transmit beamspace matrices for the subaperturing FDA to generate a similar main lobe toward the target for radar functionality but distinct null depth levels for communication purpose, so that the transmitted information can be efficiently detected by the intended communication receiver. The performance of the proposed design is evaluated using the bit error rate for communication and using the signal-to-interference-plus-noise ratio for radar.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Series-Fed Dual-Polarized Single-Layer Linear Patch Array With High
           Polarization Purity
    • Authors: Changjiang Deng;Behzad Yektakhah;Kamal Sarabandi;
      Pages: 1746 - 1750
      Abstract: In this letter, a novel dual-polarized 1 × 4 patch array using proximity feed technique is presented. The proposed single-layer antenna consists of four square patch elements, two short-terminated parallel coupled microstrip lines, and a rat-race incorporated in the feed network. The patches are placed at the inner space between the two parallel microstrip feedlines. Horizontal and vertical polarizations of the patch array are excited by the even and odd modes of the two microstrip lines, respectively. The rat-race structure is used to provide in-phase and 180° out-of-phase feeds for the two modes. A prototype operating at 3.5 GHz is fabricated and measured. The measured overlapping bandwidth of the two ports is 81 MHz, also with port isolation higher than 40 dB. Owing to the symmetry of the structure and balanced excitations, the measured cross polarizations are all below −29 dB in E- and H-planes.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • $H$ -Plane+Horn+Antenna+Array+at+ $Ka$ -Band&rft.title=IEEE+Antennas+and+Wireless+Propagation+Letters&rft.issn=1536-1225&;&rft.aufirst=Zihang&;Xiuping+Li;Jun+Xiao;Hua+Zhu;">Dielectric-Slab-Loaded Hollow Substrate-Integrated Waveguide $H$ -Plane
           Horn Antenna Array at $Ka$ -Band
    • Authors: Zihang Qi;Xiuping Li;Jun Xiao;Hua Zhu;
      Pages: 1751 - 1755
      Abstract: A dielectric-slab-loaded hollow substrate-integrated waveguide (HSIW) $H$-plane horn antenna with improved impedance matching is proposed based on printed circuit board material FR-4. HSIW is utilized to avoid high dielectric loss. Apart from that, a dielectric slab is added by directly extending the substrates for gain improvement. Moreover, two coupling lines are added above and below the horn aperture for better impedance matching. The proposed HSIW $H$-plane horn antenna shows a maximum realized gain of 11.2 dBi with 77.6% radiation efficiency and 32.9% bandwidth (27.7–38.6 GHz). Based on the antenna element, a $1times 4$ HSIW $H$-plane horn antenna array is proposed. The array shows a maximum realized gain of 17.2 dBi with 66.5% radiation efficiency and 31.9% bandwidth (27.6–38.1 GHz). Good agreements of the measured and simulated results are achieved for both designs. The proposed antenna and array can be good candidates for low-cost millimeter-wave wireless communication systems.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • A Compressed Sensing-Based Element Failure Diagnosis Method for Phased
           Array Antenna During Beam Steering
    • Authors: Can Xiong;Gaobiao Xiao;Yibei Hou;Musab Hameed;
      Pages: 1756 - 1760
      Abstract: A novel diagnosis method for phased array antenna element failure using near-field measurements based on compressed sensing is proposed. In consideration of the beam steering property of phased arrays, sampling of the radiated field is performed with fixed probes. The independence of received field data is attained in the phase domain instead of the conventional spatial domain. It yields a new way to construct the sensing matrix and, hence, the measurement vector. This strategy enables onsite diagnosis while the array under test is still scanning regularly. The reconstruction of antenna element excitations is achieved via sparse approximation methods. A nonconvex optimization algorithm is utilized to reconstruct the unknown excitation amplitudes in consideration of noise. The detection area of a single probe is limited. Arrays consisting of isotropic antennas and Hertzian dipoles are tested to verify the effectiveness of the proposed method.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • A Dielectric-Loaded Dual-Broadband Printed Dipole Antenna With Stable
           Radiation Pattern in the H-Plane
    • Authors: Xiongzhi Zhu;Jinling Zhang;Tong Cui;Zhanqi Zheng;
      Pages: 1761 - 1765
      Abstract: This letter proposes a new method of maintaining the half-power beamwidth (HPBW) in the H-plane for printed-strip dual-broadband dipole antenna by loading dielectric lens. The lens is perpendicularly placed in the direction of radiation from the antenna. In order to reduce the dielectric loss and volume, the Fresnel structure is used for the dielectric lens. The solution is broadband, covering the entire 2G/3G/LTE spectrum of 690–1000 MHz and 1710–2770 MHz. The measured results show that by loading lens, the HPBW is maintained at 120° without affecting the working frequency range of the antenna, and the gain is increased by about 1 dB.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • An Array Position Refinement Algorithm for Pencil Beam Pattern Synthesis
           With High-Order Taylor Expansion
    • Authors: Shiwen Lei;Haoquan Hu;Bo Chen;Pu Tang;Jing Tian;Xiangdong Qiu;
      Pages: 1766 - 1770
      Abstract: In this letter, the array position refinement for low peak sidelobe level (PSLL) generation utilizing uniform element excitation is investigated. The array beam pattern is expressed as a polynomial function with respect to (w.r.t.) the array position variation, i.e., $Delta {bf x}$, via the high-order Taylor expansion. An iterative algorithm is proposed to solve the optimization problem w.r.t. $Delta {bf x}$ to achieve the low PSLL. The algorithm, first, converts the original nonconvex problem into a convex one; thus, the problem can be solved efficiently by readily available tools. The array position is, thereafter, updated iteratively by adjusting $Delta {bf x}$ with a convex technique. Numerical simulations with both linear and planar array antennas are carried out to validate the effectiveness of the proposed algorithm. Compared with the existing algorithms, the proposed algorithm can further suppress the PSLLs with 0.9 and 0.4/1.2 dB for linear and planar array antennas, respectively.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Directive Wideband Cavity Antenna With Single-Layer Meta-Superstrate
    • Authors: Mohammed Amin Meriche;Hussein Attia;Abderraouf Messai;Sheikh Sharif Iqbal Mitu;Tayeb Ahmed Denidni;
      Pages: 1771 - 1774
      Abstract: A new wideband and enhanced gain Fabry–Pérot cavity antenna is presented in this letter. The Fabry–Pérot cavity is established between a single-layer metamaterial-based partially reflective surface (PRS) and a simple feeding slot antenna. The unit cell of the PRS consists of printed and etched square rings on both sides of the superstrate. A 6 × 6 array of the unit cells is optimized to produce a positive reflection phase gradient required for the gain enhancement. Simulated results of the designed Ku-band antenna demonstrate an impedance bandwidth of 13.1–15.3 GHz (15.5%) with a gain enhancement up to 8.2 dB (i.e., 150% gain increase above the feeding antenna) and a 3 dB radiation bandwidth of 18.7%. Experimentally observed reflection and radiation responses of the fabricated prototype validate the simulated results.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • High-Order Unconditionally Stable Time-Domain Finite-Element Method
    • Authors: Karanvir Taggar;Emad Gad;Derek McNamara;
      Pages: 1775 - 1779
      Abstract: This letter presents a new approach for finite-element time-domain electromagnetic analysis. The new method combines the property of high-order approximation in the time domain with the crucial property of unconditional stability. The proposed method has been used in circuit simulation and relies on employing a specific formulation of the numerical inversion of the Laplace transform. The method is validated using one- and two-dimensional scattering from a dielectric object.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Field-Strength Variations of LF One-Hop Sky Waves Propagation in the
           Earth–Ionosphere Waveguide at Short Ranges
    • Authors: Lili Zhou;Jingjing Yan;Zhonglin Mu;Yurong Pu;Qiaoqiao Wang;Lifeng He;
      Pages: 1780 - 1783
      Abstract: One-hop sky-wave signals in the Earth–ionosphere waveguide are studied based on the traditional wave-hop theory and the finite-difference time-domain (FDTD) method. Field-strength variations of 100 kHz one-hop sky waves are given under three different waveguide models. The great-circle distance between the transmitter and the receiver is within 200 km. Together with a sky- and ground-wave separation technique in time domain, the narrowband Loran-C signals are employed in the FDTD method. Compared to the results of wave-hop theory, field-strength variations of low-frequency one-hop sky waves are better characterized by the FDTD method as the waves propagate in an irregular Earth–ionosphere waveguide.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Characteristic Mode Cancellation Method and Its Application for Antenna
           RCS Reduction
    • Authors: Yan Shi;Zan Kui Meng;Wen Yue Wei;Wei Zheng;Long Li;
      Pages: 1784 - 1788
      Abstract: This letter proposed a characteristic mode cancellation method for design of an antenna radar cross section (RCS) reduction. Two kinds of subarrays whose unit cells are composed of a square patch with a circle hole and a cross patch, respectively, are designed. With the characteristic mode theory, the currents represented by the characteristic modes of two subarrays flow in an opposite direction. By arranging two subarrays into a checkerboard patterned array, cancellation of their characteristic modes is achieved and, thus, the resultant RCS of the whole array is greatly reduced. The checkerboard array is integrated with a microstrip antenna to reduce its RCS. The simulated and measured results are in good agreement and show that with the checkerboard array, the operating band of the reference microstrip antenna covering 8.32–9.32 GHz keeps unchanged, and the −10 dB broadband RCS reduction both in band and out of band of the microstrip antenna is from 6.4 to 21.4 GHz with an in-band gain increase of 1 dB.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Low-Impedance Flexible Archimedean-Equiangular Spiral Antenna
    • Authors: Taisong Pan;Lingliang Dai;Sihong Chen;Zhuocheng Yan;Yuan Lin;
      Pages: 1789 - 1793
      Abstract: A flexible low-impedance wideband antenna with a hybrid structure of Archimedean spiral and equiangular spiral is presented in this letter. The input impedance of the antenna is reduced to about 75 Ω by the attenuation effect of the equiangular spiral connected to the Archimedean spiral. The prototypes of the designed flexible antennas with and without polydimethylsiloxane encapsulation were fabricated with the copper-clad polyimide film and the transfer-printing technique. The simulation results of impedance and voltage standing-wave ratio show the fabricated antenna can be operated over the frequency range of 2.5–4.5 GHz. The S-parameters of the antennas were measured before and after applying uniaxially tensile strain and complex strain induced by balloon. The results show that S11 parameter of the antennas maintains less than –10 dB in the operating frequency band with deformation. The mechanical reliability of the antennas was also confirmed by the finite-element analysis of the strain in the copper layer.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • A Low-Profile Design of Polarization Rotation Reflective Surface for
           Wideband RCS Reduction
    • Authors: Reza Zaker;Arezoo Sadeghzadeh;
      Pages: 1794 - 1798
      Abstract: A novel compact ultrawideband polarization rotation reflective surface (PRRS) with a high polarization conversion ratio (PCR) is proposed. The 90° polarization rotation (PR) is achieved by employing a PRRS-based diagonally symmetric unit cell including two L-shaped strips with two vias and a centered via-less square patch. The air-based substrate of the structure and its overall dimensions equal to 6 × 6 × 3.3 mm3 (i.e., $0.128{boldsymbol{lambda }_0} times 0.128{boldsymbol{lambda }_0} times 0.07{boldsymbol{lambda }_0} $ based on the lowest frequency of the band) provide a low-profile PRRS with a considerable reduction in thickness. The PR bandwidth of the proposed PRRS is 111% with a PCR over 90%. This PRRS is also applied for radar cross section reduction (RCSR), which provides a measured 10 dB RCSR in an ultrawide bandwidth of about 114.4% (6.4∼23.5 GHz, covering C-, X-, Ku-, and K-bands). A good agreement between the simulated and measured results and a fair comparison with the state-of-the-art approaches prove the accuracy and efficiency of the proposed design.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Isolation Enhancement of Wideband Vehicular Antenna Array Using Fractal
           Decoupling Structure
    • Authors: Xiao-Lai Li;Guo-Min Yang;Ya-Qiu Jin;
      Pages: 1799 - 1803
      Abstract: Wideband vehicular planar inverted-F antenna (PIFA) array with high isolation by using a fractal structure is presented in this letter. The PIFA antenna elements are placed face to face, and the decoupling structure (DS) consisting of four fractal unit slots and a narrow line slot is inserted between elements to reduce the mutual coupling. The proposed structure is fabricated, and the suppression effect of mutual coupling is verified by both the simulation and measurement. Measured results show that the impedance bandwidth is from 3.02 to 3.96 GHz, which covers the 5G working frequency. An enhanced isolation of 8–32 dB in the frequency band of 3.17–4.15 GHz is obtained compared to without DS when the distance is only 0.17λ0 (λ0 is the free-space wavelength at the center frequency of 3.5 GHz) between two PIFA elements.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Measurement-Based Modeling and Analysis of UAV Air-Ground Channels at 1
           and 4 GHz
    • Authors: Zhuangzhuang Cui;César Briso-Rodríguez;Ke Guan;César Calvo-Ramírez;Bo Ai;Zhangdui Zhong;
      Pages: 1804 - 1808
      Abstract: In the design of unmanned aerial vehicle (UAV) wireless communications, a better understanding of propagation characteristics and an accurate channel model are required. Measurements and comprehensive analysis for the UAV-based air-ground (AG) propagation channel in the vertical dimension are presented in this letter. Based on the measurement data at 1 and 4 GHz, the large-scale and small-scale channel parameters are extracted in the line-of-sight (LOS) and nonLOS case, respectively. The altitude-dependent path loss model is proposed herein. Furthermore, shadow fading and fast fading are statistically analyzed for comprehensively describing the fading behavior. Our results will be useful in the modeling of AG channels and the performance analysis for UAV-enabled wireless communication systems.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Printed Leaky-Wave Antenna With Aperture Control Using Width-Modulated
           Microstrip Lines and TM Surface-Wave Feeding by SIW Technology
    • Authors: Maksim V. Kuznetcov;Victoria Gómez-Guillamón Buendía;Zain Shafiq;Ladislau Matekovits;Dimitris E. Anagnostou;Symon K. Podilchak;
      Pages: 1809 - 1813
      Abstract: This letter presents a width-modulated microstrip line leaky-wave antenna (LWA) with substrate-integrated waveguide and microstrip feeding. In particular, the planar antenna system consists of an integrated surface-wave launcher and three identical rows of quasi-periodic width-modulated microstrip lines for TM leaky-wave excitation, which produces a tailored binomial-like aperture distribution on the guiding surface. The behavior of the antenna when changing the width-modulated lines for different aperture distributions is also analyzed and presented. The measured LWA demonstrates a fan beam pattern in the far field with realized gain values greater than 10 dBi and with a beam direction of about $-$20$^circ$ from broadside at 23 GHz. Also, far-field measurements and near-field data indicate that the half-power beamwidth is below 10$^circ$, and the position of the main beam maximum is relatively stable, i.e., ranging from about $-$23$^circ$ to $-$15$^circ$ between 23 and 24 GHz. The measured prototype is also well matched over these frequencies and $ S_{11} < $ $-$20 dB at 23.5 GHz.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Improvement in Computation Time of the Finite Multipole Method by Using
           K-Means Clustering
    • Authors: Dal-Jae Yun;In Il Jung;Haewon Jung;Hoon Kang;Woo-Yong Yang;In Yong Park;
      Pages: 1814 - 1817
      Abstract: K-means algorithm is one of the most widely used clustering algorithms in unsupervised machine learning. In the K-means clustering, input data are classified into the corresponding cluster based on the nearest mean criteria. We utilize the K-means clustering to create groups of basis functions in the finite multipole method. By replacing the conventional cube grouping with the K-means clustering, convergence rate in an iterative solver is improved. The computation time is thus alleviated without loss of the calculation accuracy. The performance of the proposed scheme is demonstrated by using both canonical and realistic computer-aided design models.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Dual-Loop Antenna for 4G LTE MIMO Smart Glasses Applications
    • Authors: Yan-Yan Wang;Yong-Ling Ban;Zaiping Nie;Chow-Yen-Desmond Sim;
      Pages: 1818 - 1822
      Abstract: A dual-loop antenna with massive-input–massive-output (MIMO) operation within the fourth-generation Long Term Evolution (LTE) bands for smart glasses applications is proposed. The 2 × 2 MIMO antenna array is formed by converting the glasses frame into two symmetrical single-loop antenna structures and using the glasses “temple” region as a common ground plane. For each single-loop antenna to excite four resonant modes so that it can yield a desirable −6 dB impedance matching across the desired low band (LB), 824–960 MHz, and high band (HB), 1710–2690 MHz, of LTE operations, a simple matching circuit is loaded into the open section of the loop antenna. Further measurements show good efficiency and isolation across the LB and HB for the dual-loop antenna. Finally, the calculated envelope correlation coefficient and ergodic channel capacity of the 2 × 2 MIMO antenna are also discussed.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Wireless Power Transfer System Based on Magnetic Dipole Coupling With High
           Permittivity Metamaterials
    • Authors: Tarakeswar Shaw;Debasis Mitra;
      Pages: 1823 - 1827
      Abstract: In this letter, we present a new approach for the performance improvement of a wireless power transfer (WPT) system by utilizing the high permittivity property of metamaterials (MTMs). Here, fully planar structures are considered to design the transmitting (Tx) and receiving (Rx) sections of the WPT system. The performance of the proposed system is enhanced by placing the MTM slabs at both sides of the Tx and Rx elements. The high permittivity property of MTM generates a strong magnetic dipole behavior, which increases the magnetic coupling between the Tx and Rx sections. As a result, the efficiency of the proposed system is improved significantly along with the transmission distance. The lateral and angular misalignments are also studied for the presented system. Finally, the prototypes of the proposed configuration are fabricated, and measurements are performed. The measured result confirms that a considerable amount of efficiency improvement is obtained from the proposed WPT system by the virtue of MTM usage.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Characterization of Mesoscopic Dielectric Cuboid Antenna at
           Millimeter-Wave Band
    • Authors: Yuuto Samura;Kazuki Horio;Vladimir B. Antipov;Sergey E. Shipilov;Aleksandr I. Eremeev;Oleg V. Minin;Igor V. Minin;Shintaro Hisatake;
      Pages: 1828 - 1832
      Abstract: A mesoscopic dielectric cuboid antenna (DCA), which can be connected to a standard waveguide, is proposed to achieve high directivity with a simple-structure and low-profile antenna compared with that of a horn antenna of same dimensions. We optimized the antenna dimensions based on simulation to maximize the antenna gain of 14.22 dBi, which is 1.9 dB higher than that of the horn antenna with the same dimensions. Simulation was performed both at 300 and 24 GHz. As a proof of concept, we designed and fabricated a scaled DCA with dimensions of 1.2$lambda ,times ,1.2lambda ,times ,1.36lambda$ and experimentally evaluated the radiation pattern at 24 GHz band. The full-width at half-maximum (FWHM) values were approximately 21% and 34% narrower than those of the horn antenna in the E-plane and H-plane, respectively. The frequency characteristic of sensitivity enhancement using the DCA as the reception antenna shows that the DCA is a nonresonant antenna with a wide bandwidth. Narrower FWHMs of the DCA have been discussed with respect to a two-dimensional near-field phase distribution measured using the electrooptic sensing technique.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • A Miniaturized High-Selectivity Frequency Selective Rasorber Based on
           Subwavelength Resonance and Interdigital Resonator
    • Authors: Qiming Yu;Shaobin Liu;Agostino Monorchio;Xiangkun Kong;Yongdiao Wen;Zhengyu Huang;
      Pages: 1833 - 1837
      Abstract: A miniaturized high-selectivity frequency selective rasorber (FSR) with subwavelength resonance and interdigital resonator, which exhibits low insertions loss in passband and two high absorption bands at both sides of one passband, is investigated. The FSR consists of a lossless layer and a lossy layer. The lossy layer is made by a periodic arrangement of cross-dipoles with resistive sheets loaded on both sides of the interdigital resonator. The lossless layer is a bandpass, subwavelength resonant, frequency selective surface composed of three layers of metal in the shape of squares and crosses. An equivalent circuit model is proposed to analyze its operating principle. A meandering procedure is used in conjunction with subwavelength resonance and interdigital resonator to achieve miniaturization of the FSR. The unit cell dimensions are $0.087lambda _{L}times 0.087lambda _{L}times 0.1lambda _{L}$ ($lambda _{L}$ being the free-space wavelength at the lowest operating frequency). Additionally, the designed rasorber has the property of high selectivity due to the subwavelength resonance. Under normal incidence, an insertion loss of about 0.21 dB is obtained at 10.25 GHz, the fractional bandwidth for −10 dB reflection is about 94.5%, and the −3 dB transmission relative bandwidth is 15.7%. The FSR shows a stable response over a wide range of incidence angle of 30° for both transverse electric (TE) and transverse magnetic (TM) polarizations. A prototype of designed FSR has been manufactured and measured, showing a reasonable agreement with simulations.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • A Fast Pattern Computation Method for Deformed Antenna Arrays
    • Authors: Shunxi Lou;Wei Wang;Sihao Qian;Chaoliu Ge;
      Pages: 1838 - 1842
      Abstract: In this letter, we propose a fast method to analyze the radiation patterns of deformed antenna arrays. The mutual coupling effect is characterized by the perspective of modal coupling between different radiating elements based on the theory of characteristic modes. The structural error term is extracted from the reaction integral operation using the Taylor expansion, so that the modal coupling coefficients could be quickly analyzed when structural deformations exist in the antenna arrays. Numerical examples are investigated to demonstrate the effectiveness of the proposed method.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Design of Dual-Absorptive-Bands Frequency Selective Rasorber With
           Minkowski Loop Arrays
    • Authors: Ximeng Zhang;Weiwei Wu;Lei Huang;Yuhong Ma;Naichang Yuan;
      Pages: 1843 - 1847
      Abstract: A dual-absorptive-bands frequency selective rasorber with Minkowski loop arrays is proposed in this letter, which has a passband and two absorptive bands on either side of the passband. In our design, this structure consists of a lossy layer and a frequency selective surface (FSS) layer. These two layers are isolated by air. The lossy layer is composed of Minkowski loop arrays with branches and resistors loaded on the loop, and the FSS layer is a metallic array composed of grids and square loops. Based on the equivalent circuit model and the surface current distribution, the electromagnetic characteristics of the frequency selective rasorber (FSR) are studied, and the simulation results show that the structure has a passband with an insertion loss of 0.36 dB at 7.65 GHz. Additionally, the fractional bandwidth of $-$10 dB reflection reaches up to 119.3% under normal incidence and has good stability under oblique incidence. Furthermore, the FSR is fabricated and measured to verify our design and demonstrates good agreement with the simulations.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Design Method for Modulated Metasurface Antennas Composed of Anisotropic
           Elements Based on Generalized Boundary Conditions
    • Authors: Xiao Liu;Fan Yang;Shenheng Xu;Maokun Li;
      Pages: 1848 - 1852
      Abstract: A novel and efficient design method for modulated metasurface antennas composed of anisotropic elements is proposed in this letter, based on generalized boundary conditions. An analytical model of surface impedance is derived with the effective surface susceptibilities of the patch layer, an equivalent circuit model of the element, and the transverse resonance technique. The analysis method of elements is then utilized to design modulated metasurface antennas with desired radiation patterns. A linearly polarized antenna prototype with a circular aperture of 180 mm in diameter is designed and measured to demonstrate the effectiveness of this approach. The prototype shows good radiation characteristics at 9.75 GHz with the measured gain of 21.77 dB and the aperture efficiency of 44.5%.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Detecting and Receiving Phase-Modulated Signals With a Rydberg Atom-Based
    • Authors: Christopher L. Holloway;Matthew T. Simons;Joshua A. Gordon;David Novotny;
      Pages: 1853 - 1857
      Abstract: The recent developments of Rydberg atom-based sensors with the ability to measure phase have made it possible to receive digital phase-modulated signals. In this letter, we demonstrate the reception of binary phase-shift keying, quadrature phase-shift keying, and quadrature amplitude modulation signals with an atom-based receiver. We present measured values of error vector magnitude as a function of symbol rate for various modulation schemes and discuss the bandwidth of a Rydberg atom-based receiver system. The results show that we can now interrogate ensembles of atoms to such extent that we can use them to receive data from a phase-modulated communication signal.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Temporal Focusing Effects of Time-Reversal Frequency Diverse Array Antenna
    • Authors: Jie Cheng;Wen-Qin Wang;Hui Chen;Shilong Ji;
      Pages: 1858 - 1862
      Abstract: Omnidirectional or the phased-array antenna is usually adopted in the time-reversal literature, but it cannot focus the power of the transmitted signals in both time- and space-domains. In this letter, we propose the hybridization of time reversal and frequency diverse array (FDA), which transmits the signal with a small frequency offset across the array to generate both angle- and range-dependent beampattern, for temporal focusing. The time-reversal FDA channel is modeled in multipath scenarios. For the given parameters with 12 transmit elements spaced by half-wavelength, carrier frequency $1,$GHz, and frequency offset $1,$kHz, the peak of time-reversal FDA focusing is $18.7%$ higher than that of a standard FDA. Both theoretic analysis and simulation results verify that, while maintaining FDA angular-time periodicity, the FDA range periodicity is eliminated and the energy is focused at the target position by the use of time-reversal processing.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Nonuniform Fabry–Perot Leaky-Wave Antenna With Flat-Topped Radiation
           Patterns for Microwave Wireless Power Transmission
    • Authors: Cheng Chen;Bing Zhang;Kama Huang;
      Pages: 1863 - 1867
      Abstract: The uniform Fabry–Perot leaky-wave antennas (LWAs) achieve pattern shaping due to a controlled aperture phase field, which is implemented by using a partially reflective surface (PRS) with a variable propagation constant on a ground plane. The uniform PRS can convert the radiation pattern from a pencil beam to a flat-topped beam when tuning the phase constant. Meanwhile, the beamwidth of the flat-topped uniform LWA becomes inevitably wide. The nonuniform LWA, which can provide nonlinearly variant phase aperture field, is thus proposed to narrow the beamwidth of the flat-topped pattern. The concentrated flat-topped radiation pattern is much preferred in microwave wireless power transmission. The synthesis of a flat-topped nonuniform LWA with a concentrated pattern is proposed. A nonuniform LWA with a periodic mesh grid has been fabricated and measured for verification. Compared with the uniform LWA, the measured results indicate 1.7 dB gain increment and 10° beamwith shrinkage, which proves the effectiveness of the proposed method.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Transient Plane-Wave Transmission Through an N-Layer Structure by the
           Method of Subregions
    • Authors: Ugur Cem Hasar;Yunus Kaya;Joaquim J. Barroso;
      Pages: 1868 - 1872
      Abstract: The temporal transmission properties of an N-layer structure under planar wave incidence are investigated by the method of subregions via the wave matrix approach. The transmission coefficient expression is first expressed in the frequency-domain by reduced transmission coefficients and then transformed into the time domain, which includes unit step functions with different effective time periods and weightings. The analysis is validated by numerical computations and three-dimensional electromagnetic simulations at gigahertz frequencies.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Miniature Dual-Band Meander-Line Monopole Chip Antenna With Independent
           Band Control
    • Authors: Zhen-Xing Xia;Kwok Wa Leung;Mike W. K. Lee;Nan Yang;
      Pages: 1873 - 1877
      Abstract: A dual-band monopole chip antenna with an overall size of 5 × 3 × 2.1 mm3 is investigated for 2.4/5.2/5.8 GHz WLAN applications. The chip antenna has three substrates with four copper layers in total. It deploys a modified nonuniform folded meander line and capacitive loading patches to reduce the antenna size. A fundamental monopole mode and a higher order mode are excited to obtain the 2.4 GHz (2.40–2.48 GHz) and 5 GHz (5.150–5.350 GHz and 5.725–5.875 GHz) WLAN bands, respectively. The lower and upper bands can be independently controlled by the widths of the meander lines on the first and third layers, respectively. A prototype was fabricated and measured to verify the idea. A reasonable agreement between the measured and simulated results is observed. The measured 10 dB impedance bandwidths of the lower and upper bands are 5.3% (2.38–2.51 GHz) and 19.3% (5.14–6.24 GHz), respectively, fully covering the 2.4/5.2/5.8 GHz WLAN bands. The measured efficiency of the chip antenna is higher than 60% for the two bands.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • An Improved Random Taguchi's Method Based on Swarm Intelligence and
           Dynamic Reduced Rate for Electromagnetic Optimization
    • Authors: Xingning Jia;Guizhen Lu;
      Pages: 1878 - 1881
      Abstract: To avoid being easily trapped in a local optimal solution of Taguchi's method, an improved random Taguchi's method (IRTM) based on swarm intelligence and dynamic reduced rate (DRR) function is presented in this letter. The DRR is linked to the design parameter's percentage contribution toward performance variance obtained from the analysis of variance. To demonstrate the efficiency of the IRTM, four test function benchmarks and the design of an aperiodic planar array are investigated. Moreover, the results of the IRTM are compared with that of the classic meta-heuristic algorithms. From the comparison results, the IRTM is more efficient in that better performance could be obtained with less experiment times.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • A Ka-Band Circularly Polarized Substrate Integrated Cavity-Backed Antenna
    • Authors: Wenxun Li;Xiao Hong Tang;Yang Yang;
      Pages: 1882 - 1886
      Abstract: A high-gain 4 × 4 substrate integrated waveguide (SIW) circularly polarized (CP) antenna array at a Ka-band with a quadruple-ridge waveguide polarizer is proposed in this letter. The antenna array consists of 16 cavity-backed slot antenna elements, quadruple ridge waveguide polarizers, and SIW T-type power dividers. Dominant resonant mode TE110 is excited in the cavity-backed slot antenna element. The measured impedance bandwidth (S11 < –10 dB) is from 35.3 to 35.55 GHz, and 3 dB axial-ratio bandwidth is from 35.24 to 35.57 GHz. In addition, the maximum measured gain of 18.14 dBi at the boresight is experimentally obtained at 35.42 GHz. The antenna prototype was fabricated by a multilayer printed circuit board technology. To the best of our knowledge, the quadruple-ridge waveguide is used as polarizer to produce CP signals for the first time. Compared with an aperture antenna with a conventional rectangle or a circular waveguide polarizer, this work has high aperture radiation efficiency as well as compact size. This design idea may open a new way for development of millimeter-wave high-efficiency arrays.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Ultrawideband Electromagnetic Absorber Using Sandwiched Broadband
    • Authors: Daecheon Lim;Sungjoon Lim;
      Pages: 1887 - 1891
      Abstract: In this letter, we propose an ultrawideband electromagnetic absorber using sandwiched broadband metasurfaces. The proposed absorber consists of three layers. The broadband metasurface for high frequencies is loaded on the upper layer. Another broadband metasurface for low frequencies is loaded on the lower layer. The two broadband metasurfaces form a sandwich with the air space in the middle layer. Each metasurface is realized by a periodic array of circular sector patterns with chip resistors. The fabricated absorber shows higher than 90% absorptivity from 3.87 to 14.84 GHz. Under oblique incidence, the absorber shows higher than 80% absorptivity from 3.78 to 15.63 GHz when the incident angle is less than 40° in the transverse electric mode. In the transverse magnetic mode, the absorber shows higher than 80% absorptivity from 5.11 to 15.13 GHz when the incident angle is less than 50°.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Physically Controlled CubeSat Antennas With an Adaptive Frequency
    • Authors: Youssef Tawk;
      Pages: 1892 - 1896
      Abstract: This letter advocates the use of mechanical actuation to alter the electrical length of components within antenna elements proposed for implementation onto a CubeSat platform. Such electrical length alteration reconfigures the antenna's frequency operation without affecting its polarization scheme. This concept is first demonstrated on a reconfigurable quadrifilar helix that reconfigures its frequency operation between 750 MHz and 1 GHz, while maintaining a circular polarization behavior. As a second demonstration, a Yagi–Uda antenna is reconfigured by changing the electrical length of its reflector, fed elements, and two directors. Such alteration results in a frequency reconfiguration between 1.2 and 1.5 GHz, while preserving the linear polarization behavior of the antenna array. For both antenna examples, the reconfiguration is implemented through the appropriate mechanical actuators that are integrated within the CubeSat's cavity. As a proof of concept, both structures are fabricated and integrated on the outside chassis of a 6U CubeSat $(text{10}times text{20}times text{30},text{cm}^{3})$, where measured results greatly match the simulated data.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • SIW-Based Self-Oscillating Concurrent Dual-Frequency Active Integrated
    • Authors: Moitreya Adhikary;Sunil Kumar Sahoo;Animesh Biswas;M. Jaleel Akhtar;
      Pages: 1897 - 1901
      Abstract: In this letter, a self-oscillating concurrent dual-frequency active integrated antenna (DFAIA) is proposed. The proposed circuit is designed based on substrate-integrated waveguide technology, where the concurrent dual-frequency feature is realized by the use of a miniaturized self-oscillating/self-diplexing antenna. The feedback paths on either side of the diplexing antenna, comprising a main port and an auxiliary port, are employed to design the concurrent dual-frequency oscillator. The proposed DFAIA transmits 7.97 and 8.9 GHz signals simultaneously, having effective isotropic radiated power level of 5.3 and 6.41 dBm for the 7.97 and 8.9 GHz signals, respectively. The measured phase noise is approximately −90 and −110 dBc/Hz at 100 kHz and 1 MHz offset, respectively for both the lower and the higher frequencies. The overall circuit footprint is $mathbf {text{1.33}lambda _{g}times text{2.26}lambda _{g}}$ at the mean frequency of 8.4 GHz.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Bifunctional Broadband Zone Plate for Highly Directive Broadside Emissions
           and Endfire Radiations
    • Authors: Shiyi Yan;Rui Yang;Jinbiao Zhu;
      Pages: 1902 - 1906
      Abstract: Zone plate reflectors for the highly directive broadside radiations are investigated in this letter, where we show that such a reflector could also function as a lens with endfire emissions when integrated with a dielectric phase compensation layer. More specifically, we employ additional dielectrics to collimate electromagnetic fields radiating through the radial direction of the original zone plate reflector, and obtain well-collimated beams as a lens without degrading the performances of the zone plate as a reflector. We practically implement the proposed design through drilling subwavelength holes with different sizes in a dielectric host medium, and the perforated zone plate demonstrates the functionalities of generating both broadside and endfire radiations in a broadband frequency range.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • An Adaptive Proper Orthogonal Decomposition Method for Evaluating
           Variability Bounds of Antenna Responses
    • Authors: Jinzhu Zhou;Xingfan Wu;Le Kang;Mei Wang;Jin Huang;
      Pages: 1907 - 1911
      Abstract: Parameter uncertainties introduced by the manufacturing process will lead to the fluctuation of an actual antenna response. Efficient methods are, thus, required during the design phase to evaluate the variability bounds. This letter proposes an adaptive proper orthogonal decomposition (APOD) method to estimate the variability bounds of the radiation patterns and reflection coefficients of the antenna with uncertain parameters. In this method, a parameterized reduced order model (PROM), as a function of the uncertain parameters, is automatically constructed using a Voronoi diagrams-based multipoint sampling algorithm. Then, the PROM-based Monte Carlo analysis is applied to obtain the variability bounds of the antenna responses. Numerical simulations and experimental tests are conducted, and the results show that the proposed APOD method can obtain comparable accuracy, but achieve a fast speed enhancement, compared with the existing methods.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Wideband Circularly Polarized Waveguide-Fed Antipodal Exponential Tapered
           Slot Antenna
    • Authors: Jiashan Liu;Hongda Lu;Zihao Li;Zhipeng Liu;Zhiyong Dong;Changjiang Deng;Xin Lv;Yong Liu;
      Pages: 1912 - 1916
      Abstract: A novel waveguide-fed antipodal exponential tapered slot antenna (AETSA) is investigated to achieve wideband circular polarization. The proposed AETSA is fed by double-ridge waveguide and loaded with antipodal exponential tapered slots. The wideband axial ratio (AR) performance is discussed in detail. It is noted that this AETSA has a right-hand circularly polarized AR lower than 3 dB in 94.5% bandwidth, from 12.4 to 34.6 GHz, illustrating AETSAs potential in a wideband application. The measured VSWR is lower than 2.1 in the operating band. Gain varies from 8.3 to 18.3 dBi. This AETSA is suitable for millimeter-wave and terahertz wideband circular polarization applications.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Polarization-Insensitive and Angularly Stable Compact Ultrawide Stop-Band
           Frequency Selective Surface
    • Authors: Gouri Shankar Paul;Kaushik Mandal;
      Pages: 1917 - 1921
      Abstract: In this letter, a compact ultrawide stop-band frequency selective surface (FSS) with polarization-insensitive and higher level of angular stability property is presented. It consists of a very simple modified square-ring unit cell that exhibits excellent wideband rejection over the entire ultrawideband (UWB) 2.72–13 GHz range. For TE incident wave, the
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Active Frequency Diverse Array Counteracting Interferometry-Based DOA
    • Authors: Yudian Hou;Wen-Qin Wang;
      Pages: 1922 - 1925
      Abstract: In order to counter passive direction-of-arrival (DOA) reconnaissance for unintended eavesdroppers, this letter proposes the use of frequency diverse array (FDA) to counteract passive DOA reconnaissance using a virtual baseline interferometer. FDA applies a small frequency offset across its array elements to generate an angle-range-dependent and time-variant transmit beampattern, which provides a potential capability to achieve radio frequency (RF) stealth and localization deception for eavesdropping receivers. We analyzed the DOA localization deception of FDA transmitting signal, together with simulation examples. The results show that, while compared to conventional phased-array transmitting signal, RF localization deception of DOA estimation is indeed achieved for the FDA transmitted signals, which provides promising potentials for future secure radar and communication applications.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Accelerated Sherman–Morrison–Woodbury Formula-Based Preconditioner
           With Characteristic Basis Function Method
    • Authors: Xiaoxing Fang;Xinlei Chen;Qunsheng Cao;Yi Wang;
      Pages: 1926 - 1930
      Abstract: Based on the Sherman–Morrison–Woodbury (SMW) formula and the characteristic basis function method (CBFM) in the iterative solution of the electric field integral equation, a fast preconditioner algorithm is proposed in this letter. The SMW preconditioner is an improved version of the conventional block diagonal preconditioner and can be constructed as a sparse approximate inverse matrix of the impedance matrix to reduce the number of iterations. The CBFM is applied to reduce the storage costs of the compressed impedance and the preconditioner. The reduced preconditioner can efficiently accelerate the matrix-vector product. For validation, the numerical results of several perfect electric conductor objects are obtained to demonstrate the performance of the iterative solution time and the memory requirement of the preconditioner.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Uncertainty Analysis in Dispersive and Lossy Media for Ground-Penetrating
           Radar Modeling
    • Authors: Xi Cheng;Wei Shao;Kai Wang;Bing-Zhong Wang;
      Pages: 1931 - 1935
      Abstract: The uncertainty analysis (UA) in simulation results is essential when the acceptability of the results is considered. This letter introduces an improved intrusive generalized polynomial chaos expansion (gPCE) method for UA in ground-penetrating radar modeling. The uncertainty in simulation results induced by the uncertain parameters of two-dimensional dispersive and lossy media is quantified with the auxiliary differential equation finite-difference time-domain method combined with gPCE. The results from the new method are compared against the Monte Carlo method. The new method shows its considerable advantage in the computational expense and speed.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Linear Array Thinning Using Probability Density Tapering Approach
    • Authors: Li Gu;Yan-Wen Zhao;Zhi-Peng Zhang;Li-Feng Wu;Qiang-Ming Cai;Jun Hu;
      Pages: 1936 - 1940
      Abstract: In this letter, a novel synthesis algorithm is presented by using a probability density tapering approach in determining element distributions in a thinned array. The probability density tapering is carried out with the iterative Fourier technique (IFT) in array thinning, since the IFT method is proved effective in large array thinning, but the traditional IFT often easily gets trapped in local optima. In the proposed method, namely the probability tapering IFT (PTIFT), the element locations are determined by probability estimation. Then, a probability density taper is used to model the element distributions across the aperture. With iterations, the probability model taper is optimized to approach the global optimal solution. The efficiency of the PTIFT method was validated by some representative examples of array thinning with minimum peak sidelobe level. In addition, null placement in the uniformly illuminated thinned array with low sidelobes was investigated by utilizing the PTIFT.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • A Four-Mode OAM Antenna Array With Equal Divergence Angle
    • Authors: Fan Qin;Lihong Li;Yi Liu;Wenchi Cheng;Hailin Zhang;
      Pages: 1941 - 1945
      Abstract: Orbital angular momentum (OAM) waves with different modes usually perform different divergence angles, leading to a big challenge and high complexity for signal receiving. To address this issue, this letter presents a novel antenna array generating four-mode OAM waves with equal divergence angle. In the proposed antenna, a center patch antenna and three concentric uniform circular arrays (UCAs) are employed to carry 0, −1, −2, and −3 OAM modes from center to outer rings, respectively. Each UCA is carefully optimized to control the different mode OAM waves to propagate along the same divergence angle. To validate the design, a C-band prototype generating 0, −1, −2, and −3 modes is fabricated and measured. Measured results show that the proposed four-mode OAM waves can be well generated. More importantly, the equal divergence angle for −1, −2, and −3 mode OAM waves is obtained as expected. This antenna array can provide equal divergence angle multimode OAM waves, which simplifies the receiving side in an OAM wireless communication system.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
  • Near-Field Synthetic Spectrum Imaging Algorithm Based on Single-Frequency
           Sparse MIMO Array
    • Authors: Hui Wang;Shiyou Wu;Chao Li;Xiaojun Liu;Guangyou Fang;
      Pages: 1946 - 1950
      Abstract: This letter presents a two-dimensional near-field synthetic spectrum imaging algorithm based on a single-frequency sparse multiple-input–multiple-output (MIMO) array. By using an especially defined backward spreading function, the proposed algorithm migrates the scattered wave field under different illuminations. A synthetic spectrum can be obtained by synthesizing the spectrums of these migration results and then interpreted to the final reconstruction. The migration processing enables the algorithm to adapt to arbitrary apertures. Meanwhile, the influences of the limited aperture, the spreading loss, and the wavefront curvature in the near field are considered and compensated. High processing speed is achieved by using a large interpixel spacing during the migration processing and by the fast Fourier transform in the frequency-wavenumber (f-w) domain. Simulations and experiments are carried out, and the results demonstrate both the high-computational efficiency and the high flexibility for arbitrary sparse MIMO array apertures.
      PubDate: Sept. 2019
      Issue No: Vol. 18, No. 9 (2019)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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Fax: +00 44 (0)131 4513327
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