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  Subjects -> ELECTRONICS (Total: 186 journals)
Showing 1 - 200 of 277 Journals sorted alphabetically
Acta Electronica Malaysia     Open Access  
Advances in Electrical and Electronic Engineering     Open Access   (Followers: 6)
Advances in Electronics     Open Access   (Followers: 89)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Power Electronics     Open Access   (Followers: 35)
Advancing Microelectronics     Hybrid Journal  
Aerospace and Electronic Systems, IEEE Transactions on     Hybrid Journal   (Followers: 331)
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: 29)
Bioelectronics in Medicine     Hybrid Journal  
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 19)
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: 8)
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: 289)
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: 116)
Electronic Markets     Hybrid Journal   (Followers: 7)
Electronic Materials Letters     Hybrid Journal   (Followers: 4)
Electronics     Open Access   (Followers: 96)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 10)
Electronics For You     Partially Free   (Followers: 99)
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: 202)
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: 71)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 70)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 57)
IEEE Transactions on Circuits and Systems for Video Technology     Hybrid Journal   (Followers: 26)
IEEE Transactions on Consumer Electronics     Hybrid Journal   (Followers: 41)
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: 75)
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: 51)
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: 69)
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: 10)
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: 15)
International Journal of Microwave and Wireless Technologies     Hybrid Journal   (Followers: 8)
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: 31)
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: 7)
Journal of Electromagnetic Waves and Applications     Hybrid Journal   (Followers: 8)
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: 171)
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: 7)
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  
Journal of Microwaves, Optoelectronics and Electromagnetic Applications     Open Access   (Followers: 10)
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: 5)
Microelectronics and Solid State Electronics     Open Access   (Followers: 26)
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: 8)
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: 1)
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: 55)
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: 77)
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)
Universal Journal of Electrical and Electronic Engineering     Open Access   (Followers: 6)
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
    • Abstract: Presents a listing of the editorial board, board of governors, current staff, committee members, and/or society editors for this issue of the publication.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Broadband Stable-Gain Multiresonance Antenna Using Nonperiodic Square-Ring
    • Authors: Dongxu Chen;Wanchen Yang;Wenquan Che;Quan Xue;
      Pages: 1537 - 1541
      Abstract: A multiresonance antenna based on a nonperiodic square-ring metasurface (MS) is proposed, which has large bandwidth and stable radiation gain. The nonperiodic MS radiator is formed by several adjustable square-ring patches and fed by a microstrip line through a coupling slot. By properly adjusting the widths of these square rings, different resonance modes can be inspired for the MS according to the characteristic mode analysis. Combined with the resonance mode of the coupling slot, multiple adjacent resonance frequencies occur and thus realize a wideband and consistent radiation. For demonstration, a C-band wideband antenna based on the proposed 4 × 4 square-ring MS units with a low profile of 0.06λ0 is accordingly designed and fabricated. The measured results indicate a large impedance bandwidth of 54% (4–7 GHz) and an extremely stable gain with 2 dB gain bandwidth of 32% (4.76–6.54 GHz).
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Chinese Character-Shaped Artistic Patch Antenna
    • Authors: Kwok L. Chung;Wen Li;Yansheng Li;Ruiqi Liu;Peng Zhang;
      Pages: 1542 - 1546
      Abstract: This contribution presents a novel design of a circularly polarized (CP) array antenna composed of the Chinese character-shaped artistic patches: Zhong and Guo. Namely, the CP Zhong-shaped patch and the Guo-shaped patch join together via a feeding network to form a two-element antenna array. This is the Chinese country name of China printed in the boldfaced SimHei font. Attributed to its artistic nature, this is the first design that breaks the design principles of CP antenna array, wherein, first, nonidentical radiating elements are used, and second, nonrotated elements are excited with quadrature phases. The experimental results in combination with simulations validate that the Zhong–Guo artistic antenna exhibits a unidirectional gain of 8.2 dBic with an operating bandwidth of 0.72 GHz. The achieved bandwidth sufficiently covers the 14 channels of IEEE 802.11 at 2.4 GHz wireless local area network band.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Ultrawideband Anisotropic Glide-Symmetric Metasurfaces
    • Authors: Mahsa Ebrahimpouri;Oscar Quevedo-Teruel;
      Pages: 1547 - 1551
      Abstract: This letter presents a method to realize anisotropic two-dimensional designs with wideband operation. Glide symmetry has been proven to increase the bandwidth and equivalent refractive index of periodic structures. Here, two anisotropic glide-symmetric unit cells are proposed and characterized. Our simulated results prove that these unit cells follow the general behavior of periodic structures possessing glide symmetry. Moreover, we demonstrate that higher level of anisotropy can also be achieved by glide symmetry. Combining our proposed anisotropic glide-symmetric unit cell and transformation optics, a $text{30}%$ compressed Luneburg lens is designed. The lens operates from 1 to 13 GHz.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • FSS-Based Spatially Decoupled Back-to-Back Four-Port MIMO DRA With
           Multidirectional Pattern Diversity
    • Authors: Gourab Das;Nikesh Kumar Sahu;Anand Sharma;Ravi Kumar Gangwar;Mohammad S. Sharawi;
      Pages: 1552 - 1556
      Abstract: This letter presents a frequency selective surface (FSS)-based four-port multiple-input–multiple-output cylindrical dielectric resonator antenna (cDRA) system that supports multidirectional pattern diversity characteristics. The back-to-back arrangements of the cDRA as well as the use of an FSS are some of the features of the proposed antenna design. The cDRAs are positioned over a substrate through a common ground plane. The top side has two oppositely faced cDRAs that are excited with the help of ports-1 and 2, via coplanar waveguide-fed conformal striplines. Similar cDRA orientations also exist at the bottom side and are excited by microstrip-line-fed conformal striplines through ports-3 and 4, respectively. To improve isolation and correlation, similar phase-gradient FSSs are placed at the two sides of the substrate. As a result, four diverse radiation patterns are obtained from four ports, which ensure multidirectional pattern diversity characteristics of the proposed antenna. The proposed technique offers more than 10 dB and 75% improvement in isolation and correlation values, respectively. By observing the measured results, it is confirmed that the proposed structure is useful for WLAN access point (5.15–5.35 GHz) applications.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • A Sidelobe Level Reduction Method for mm-Wave Substrate Integrated
           Waveguide Slot Array Antenna
    • Authors: Aulia Dewantari;Jaeheung Kim;Igor Scherbatko;Min-Ho Ka;
      Pages: 1557 - 1561
      Abstract: A new method of sidelobe level (SLL) reduction for a substrate integrated waveguide (SIW) slot array antenna is presented. In this method, amplitude distribution is assigned to the slots by tapering the SIW width. The SIW with tapered width can be efficiently manufactured by varying the position of the side-wall vias. In this letter, the new method is verified on a 12-element SIW slot array antenna operating at 94 GHz to achieve SLL around –30 dB. The antenna design procedure as well as simulation and measurement results are presented.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Beam-Scanning Lens Antenna Based on Elliptical Paraboloid Phase
           Distribution Metasurfaces
    • Authors: Hao-Fang Wang;Zheng-Bin Wang;Zhi-Hang Wu;Ye-Rong Zhang;
      Pages: 1562 - 1566
      Abstract: A two-dimensional (2-D) beam-scanning lens antenna is proposed for Ka-band satellite applications, which is composed of a feed horn that can move in plane and a metasurface lens with elliptical paraboloid phase distribution. Due to the paraboloid phase compensation, the lens antenna possesses wide scanning angles in the azimuth and elevation. The fabricated lens has a size of 10.5λ0 × 10.5λ0 × 0.2λ0 (λ0 is wavelength at the center frequency of 30 GHz) and the focal-to-diameter ratio of 0.2. The total system can realize the boresight gain of 18.5 dB, and the scanning coverage of ±60° with a gain tolerance of 3.7 dB. The design methodology features the advantages of low cost, compact size, and light weight. It can find potential applications in multibeam or beam-scanning antenna systems that are comparable with array antennas.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • K/Ka Dual-Band Reflectarray Subreflector for Ring-Focus Reflector
    • Authors: Shi-Wei Qu;Senlin Lu;Chao Ma;Shiwen Yang;
      Pages: 1567 - 1571
      Abstract: A dual-band ring-focus reflector antenna with a reflectarray subreflector is proposed in this letter. Reflectarray elements present rotationally symmetric structure and a phase range of approximately 360° in the two frequency bands simultaneously. Parabolic reflector is chosen as the main reflector, and a polygonal reflectarray aperture consisting of 137 elements is designed to emulate a metal subreflector. A ring-focus reflector prototype with subreflectarrays was fabricated and measured. The simulated and measured results of the reflector antenna demonstrate a good availability of the design method for utilizing subreflectarrays into the ring-focus reflector antenna, and a good dual-band performance is shown in gain and bandwidths.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Wideband Vector Antenna for Dual-Polarized and Three-Dimensional
           Direction-Finding Applications
    • Authors: Johan Duplouy;Christophe Morlaas;Hervé Aubert;Patrick Potier;Philippe Pouliguen;
      Pages: 1572 - 1575
      Abstract: A wideband and reconfigurable radiation pattern vector antenna is proposed for dual-polarized and three-dimensional direction-finding applications. Compared with the state of the art, this antenna achieves the accurate estimation of the direction of arrival of an incoming vertically or horizontally polarized electromagnetic field over a wider bandwidth (7:1). Measurement results are in good agreement with the simulated results obtained from full-wave electromagnetic simulations.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Efficient Direction-of-Arrival Estimation Method Based on
           Variable-Step-Size LMS Algorithm
    • Authors: Babur Jalal;Xiaopeng Yang;Xuchen Wu;Teng Long;Tapan K. Sarkar;
      Pages: 1576 - 1580
      Abstract: Conventional direction-of-arrival (DOA) estimation methods based on subspace decomposition are computationally complex and difficult to implement in practical applications. Although a fixed-step-size least mean square (FSS-LMS) algorithm for DOA estimation has overcome the complexity problem; however, the manual selection of suitable step size is difficult. In this letter, a variable-step-size LMS algorithm is proposed for DOA estimation. In the proposed method, the step size is updated by using the estimated signal power and the cumulative sum of squared instantaneous error, and the spatial spectrum is obtained by the reciprocal of array pattern, where the peak values indicate the estimated DOAs of signals. The proposed method can choose step size adaptively and provide better performance with low computational complexity. The performance of proposed method is verified by the numerical simulations and compared with some existing methods.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • A Hybrid Taguchi Binary Particle Swarm Optimization for Antenna Designs
    • Authors: Xingning Jia;Guizhen Lu;
      Pages: 1581 - 1585
      Abstract: A hybrid Taguchi binary particle swarm optimization (HTBPSO) is proposed in this letter for electromagnetic optimization problems. The proposed algorithm combines the better properties of Taguchi method for updating the optimum positions of particles and improving the local search ability. To avoid premature convergence during the solution process, catfish effect operation is performed to alter the last 10% worse particle positions. Three examples, including the designs of linear and planar thinned arrays and planar triband monopole, are presented to demonstrate the efficiency of HTBPSO. As expected, experimental results show that HTBPSO achieves not only better solutions but also a faster convergence speed compared with the other two algorithms
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • A Quad-Antenna System for 4G/5G/GPS Metal Frame Mobile
    • Authors: Daiwei Huang;Zhengwei Du;Yan Wang;
      Pages: 1586 - 1590
      Abstract: This letter presents a wideband/multiband quad-antenna system for 4G/5G/GPS metal-frame mobile phones. The quad-antenna system has two kinds of antenna elements and four antenna elements. The merit of the proposed antenna system is that a quad-antenna system is achieved under the condition of metal frame, and without using any decoupling structure, the desired bands for 4G/5G/GPS are covered. A prototype was fabricated and measured. For the first kind of antenna elements (including two antenna elements), the bands of 698–960, 1710–2690, and 3400–3600 MHz are covered, and the LTE700/GSM850/GSM900/GSM1800/GSM1900/LTE2300/LTE2500/3.5 GHz bands all are covered. For the second kind of antenna elements (including two antenna elements), the bands of 1440–2690 and 3400–3600 MHz are covered, and the GPS, GSM1800/GSM1900/LTE2300/LTE2500/3.5 GHz bands are covered. The measured isolations are bigger than 10 dB. The measured efficiencies are bigger than 40% at all the working bands. The measured envelope correlation coefficients are very suitable for multiple-input--multiple-output (MIMO) communication systems.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Dual-Frequency Reflectarray Cell to Provide Opposite Phase Shift in Dual
           Circular Polarization With Application in Multibeam Satellite Antennas
    • Authors: Daniel Martinez-de-Rioja;Rafael Florencio;Jose A. Encinar;Eduardo Carrasco;Rafael R. Boix;
      Pages: 1591 - 1595
      Abstract: A new reflectarray cell is proposed to simultaneously provide opposite phase shifts between orthogonal circular polarizations at two frequencies (19.7 and 29.5 GHz) by applying a variable rotation technique independently at each frequency. The reflectarray cell, which consists of two dielectric layers with two levels of printed elements (dipoles and arcs), has been characterized for both circular and linear polarizations at each frequency. Apart from the implementation of the variable rotation technique at each frequency, the reflectarray cell provides an additional phase adjustment at the higher frequency, which can be used to shape the beam. This concept applied to multiple spot satellites in Ka-band will allow to produce two adjacent beams per feed in orthogonal circular polarizations at transmission and reception frequency bands.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Increasing Efficiency of Leaky-Wave Antenna by Using Substrate Integrated
           Slab Waveguide
    • Authors: Enrico Massoni;Maurizio Bozzi;Ke Wu;
      Pages: 1596 - 1600
      Abstract: This letter presents a possibility of increasing the radiation efficiency of double-sided leaky-wave antennas (LWAs) by using the substrate integrated slab waveguide (SISW). The idea originates from the fact that double-sided LWAs usually operate on the second mode, and the attenuation constant of the second mode in the SISW is smaller than that in the standard substrate integrated waveguide (SIW). This inherently leads to an increase of antenna radiation efficiency, as less power is dissipated by the traveling wave. In order to prove this concept, two antennas have been designed with the same characteristics (central frequency of 28 GHz, pointing angle of 50°, and beamwidth of 10°), one based on SIW and the other based on SISW. Our experimental verification yields 64% radiation efficiency for the SIW LWA and 80% radiation efficiency for the SISW LWA, thus proving the theoretical and simulated predictions.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Modal Impedance Expansion Method Using Loop-Star Basis Functions
    • Authors: Nozomi Haga;Masaharu Takahashi;
      Pages: 1601 - 1605
      Abstract: The impedance expansion method (IEM) is a circuit modeling technique for electrically very small devices based on the method of moments. In the authors’ previous work, a circuit model of a wireless power transfer system was developed using the modal IEM, which utilizes the IEM and eigenmode analysis, wherein the currents on the coils were expanded into thin-wire basis functions. However, surface basis functions are required to apply the modal IEM to arbitrarily shaped conductors. In this letter, the problems arising when the surface basis functions are applied to the modal IEM are pointed out, and the cause of these problems is clarified. Then, the resolvability of these problems is demonstrated using the loop-star basis functions.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • An Axial Compression Planar Lens Antenna Based on Discrete Transformation
           Electromagnetics Using High-Impedance Surface Cells
    • Authors: Yonghong Zhou;Xin Duan;Lin Zhou;Xing Chen;Pan Feng;
      Pages: 1606 - 1610
      Abstract: A two-dimensional (2-D) convex lens is reshaped and compressed into a 2-D flat lens with a compression ratio of 52.6% by discrete transformation electromagnetics. The single-layer high-impedance surface cells are used to fill with the compressed zone to form a planar flat lens. A parallel-plate waveguide and a 1/4 λ reflector are used to ensure that the electromagnetic energy generated by the monopole flows to the lens. The planar lens antenna, 4.35 λ × 4 λ on the lens plane and 0.375 λ tall, is fabricated and measured in TM mode at 7.5 GHz. The measured data indicate that the proposed planar lens antenna achieves an 11.3 dBi gain, 16.7° half-power beamwidth on H-plane, and almost 260 MHz impedance bandwidth for S11. The joint design of discrete transform electromagnetics and high-impedance surface cells is a new method, which has strong reference value for the miniaturization of other lens antennas.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • On Special Functions for Radiation From Sources Close to an Electrically
           Large Convex Surface
    • Authors: Babajide A. Salau;Çağatay Tokgöz;Nuri Yilmazer;
      Pages: 1611 - 1615
      Abstract: Several high frequency asymptotic methods in electromagnetics include Fock-type functions. Acoustic hard and soft Fock functions are used as special functions in asymptotic solutions for radiation from sources on an electrically large conducting convex surface. Formulations are available for accurate evaluation of these functions. Asymptotic solutions for radiation from sources close to an electrically large conducting convex surface include the derivatives of these Fock functions as well. However, the existing formulations for the functions do not yield accurate and continuous results for their derivatives. In this letter, the existing formulations are modified to adjust the boundaries between separate intervals for efficient and accurate evaluation of the Fock functions and their derivatives, and to assess continuity across the boundaries for different numbers of terms. The modified formulations are used in the extended uniform geometrical theory of diffraction solution to predict the radiation pattern of a quarter wavelength monopole antenna, which is validated in comparison with the results of the multilevel fast multipole method (MLFMM).
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • V-Band Wideband Circularly Polarized Endfire Multibeam Antenna With Wide
           Beam Coverage
    • Authors: Fei Yang Xia;Yu Jian Cheng;Ya Fei Wu;Yong Fan;
      Pages: 1616 - 1620
      Abstract: A V-band wideband circularly polarized (CP) endfire multibeam antenna array with the wide beam coverage is presented in this letter. First, a wideband compact endfire CP element with the wide axial ratio (AR) beamwidth is proposed. The design procedure and working principle of the element are discussed in detail. Besides, connected holes are used to reduce the mutual coupling and improve the AR performance. After that, a wideband substrate integrated waveguide Butler matrix is designed to feed the antenna array. Finally, the multibeam antenna is fabricated, measured and investigated. The measured results demonstrated that the proposed multibeam antenna provides a wide −10 dB impedance bandwidth of 28.5% (55.5 to 74 GHz) and a wide 3 dB AR bandwidth of 24.6% (57 to 73 GHz). Additionally, a wide beam coverage ranging from 45°–66° is achieved. Good agreement achieves between measured results and simulated ones.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Design of Diffusive Modified Chessboard Metasurface
    • Authors: Mustafa K. Taher Al-Nuaimi;Wei Hong;Yejun He;
      Pages: 1621 - 1625
      Abstract: In this letter, the design of ultrathin diffusive modified chessboard metasurface at microwave band is presented. Each quadrant of the conventional 2 × 2 chessboard is replaced by a small size 1-bit reflectarray exhibiting an optimized diffusive 1-bit quantized phase distribution. Furthermore, the proposed chessboard metasurface is designed in such a way to also have 180° phase shift between any adjacent quadrants (reflectarrays). A subwavelength-spaced cross-polarization rotating anisotropic unit cell, which can rotate the polarization of a linearly polarized incident wave to its orthogonal (cross polarized) component with 99% polarization conversion efficiency from 7 to 16 GHz, is used to compose a two small size 1-bit reflectarrays. The proposed unit cell and its mirror image are used to provide the required 1-bit phase states (“0°” and “180°”) of the 8 × 8 unit cells reflectarrays. The proposed diffusive metasurface is composed of four reflectarrays and has an aperture dimensions of 160 × 160 × 3.04 mm3. Both simulation and measurement results show that the proposed metasurface can diffuse the incident electromagnetic wave regardless of the polarization of the incident wave and under wide angle of incidence (up to 60°) with 10 dB radar cross reduction when compared to a PEC plate of same size.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Design of Off-Center Fed Windmill Loop for Pattern Reconfiguration
    • Authors: Hui Li;Miao Wu;Shanshan Yuan;Changfei Zhou;
      Pages: 1626 - 1630
      Abstract: In this letter, a low-profile pattern-reconfigurable antenna has been designed. The antenna is modified from a conventional windmill loop antenna, with the radial arms disconnected at the center and a shorting via added between the top and bottom layers. Three different patterns are controlled by three p-i-n diodes, which are located at the center of the bottom layer and operate as switches. A half-wavelength bent dipole with a reflector provides a boresight radiation with directional pattern on the azimuth plane. The second boresight pattern is obtained by a coupled fed half-wavelength dipole together with another one-wavelength dipole. The radiation nulls of the two boresight patterns are complementary to each other on the azimuth plane. A third pattern with omnidirectional radiation on the azimuth plane is obtained when the current is uniformly distributed along the arcs, forming a typical magnetic dipole. The antenna operates at 2.4 GHz wireless local area network (WLAN) band (2.40–2.485 GHz), with the measured average efficiencies of 82%, 82%, and 80% for the three modes, respectively.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Method for Scattering of Electromagnetic Waves From the Human Body Based
           on Truncated Norton Surface Wave Approximation
    • Authors: Nikolai Simonov;Seong-Ho Son;Min-Ho Ka;
      Pages: 1631 - 1635
      Abstract: The interaction of millimeter waves with lossy bodies is of interest for applications such as remote sensing, imaging, security screening, and military applications. A new approximate simulation method is proposed for the electromagnetic (EM) scattering of millimeter waves from lossy bodies. This truncated Norton surface wave approximation (TSWA) is based on the application of a generalized transition matrix that describes the excitation of Norton surface waves by point sources, which are placed at the body interface for homogeneous lossy materials. The interface is represented by overlapped square patches, which playing role of supports of spline basis functions. The patch size can be of the order of the incident wavelength or larger, enabling the number of variables to be reduced. The total scattered EM field is defined as a superposition of scattered waves from all patches. Verification was performed by comparing the results of simulations using the TSWA method with those of an exact EM solver. The TSWA method was also applied to simulate the multifrequency scattering from a whole human body using a multistatic array.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Excess Attenuation Caused by Antenna Wetting of Terrestrial Microwave
           Links at 32 GHz
    • Authors: Pavel Valtr;Martin Fencl;Vojtěch Bareš;
      Pages: 1636 - 1640
      Abstract: Excess attenuation of microwave radio links caused by the wet antenna effect is addressed. Long-term measured attenuation of two commercial microwave links (816 m 611 m long) at 32 GHz is compared to theoretically predicted rain attenuation. The theoretical prediction is calculated using a kRα relationship where k and α are constants derived from a local disdrometer measurement, and rain rate R is available from rain gauges placed at both ends of the links to obtain the distribution of rain rate along the path length. From this comparison, excess attenuation caused by antenna wetting is derived. A new model describing wet antenna attenuation (WAA) as a function of rain rate is suggested where excess attenuation reaches approx. 3 dB per antenna for a rain rate of 100 mm/h. Statistics of theoretically predicted rain attenuation, including the WAA term, is compared with statistics of measured attenuation on a set of three other links working at the same frequency. Adding the wet antenna term to the rain attenuation calculation significantly improves the accuracy of the rain attenuation prediction.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Compact UWB MIMO Antenna With High Isolation Using Fence-Type Decoupling
    • Authors: Lili Wang;Zhonghong Du;Hailong Yang;Ruoyan Ma;Yuchen Zhao;Xueqi Cui;Xiaoli Xi;
      Pages: 1641 - 1645
      Abstract: In this letter, an ultrawideband (UWB) multiple-input–multiple-output (MIMO) antenna using a novel fence-type decoupling structure, which has high isolation in the UWB, is presented. The MIMO design consists of two half-cutting UWB antenna units that have good low-frequency impedance-matching performance because of the use of a rectangular slot on the radiation patch. Meanwhile, the isolation in the operating band is enhanced by introducing the fence-type decoupling structure at the ground of the antenna. Furthermore, the L-shaped parasitic branches are designed to heighten the impedance bandwidth and isolation in the low-frequency band, i.e., 3–3.4 GHz. The simulation and experiments show that the antenna has low mutual coupling (S21 < –25 dB) and a low envelope correlation coefficient (ECC < 0.004) in the UWB.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Design of Low-Cost, Flexible, Uniplanar, Electrically Small,
           Quasi-Isotropic Antenna
    • Authors: Yang Wang;Ming-Chun Tang;Shanyong Chen;Lu Li;Dajiang Li;Kun-Zhi Hu;Mei Li;
      Pages: 1646 - 1650
      Abstract: A low-cost, flexible, uniplanar, electrically small, quasi-isotropic antenna with considerably simple structure is proposed and experimentally investigated in this letter. The antenna is composed of a pair of driven striplines and a split-ring resonator (SRR) with two extended strips on the same side of the substrate. The equivalent electric and magnetic dipoles generated by the SRR could realize omnidirectional radiation patterns oriented to x- and y-axis, respectively, with nearly the same amplitude of the realized gains. With the orthogonalized radiation patterns between the equivalent electric and magnetic dipoles, the measured results, in good agreement with the simulation values, demonstrated that the antenna has a quasi-isotropic radiation pattern with maximum gain difference around 3 dB in the whole sphere, an electrically small size (0.154 × 0.154 × 0.0004 λ3, ka = 0.68), and an overall efficiency 77%. Moreover, the performance characteristics of the antenna remains unchanged even when bending the antenna in different ways by conforming it on cylinders of various radii, proving its suitability for conformal applications.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Fast Green Function Evaluation for Method of Moment
    • Authors: Shunchuan Yang;Donglin Su;
      Pages: 1651 - 1655
      Abstract: In this letter, an approach to accelerate the matrix filling in the method of moment (MOM) is presented. Based on the fact that the Green function is dependent on the Euclidean distance between the source and the observation points, we constructed an efficient adaptive one-dimensional interpolation approach to fast calculate the $Exp$-type function values. In the proposed method, several adaptive interpolation tables are constructed based on the maximum and minimum distances between any two integration points with local refinement near zero function values to minimize the relative error. An efficient approach to obtain the sampling points used in the interpolation phase is carefully designed. Then, any function values can be efficiently calculated through a linear interpolation method for $Exp$ and a Lagrange polynomial interpolation method for the Green function. In addition, the error bound of the proposed method is rigorously investigated. The proposed method can be quite easily integrated into the available MOM codes for different integration equation (IE) formulations with few efforts. Comprehensive numerical experiments validate its accuracy and efficiency through several IE formulations. Results show that over 20% efficiency improvement can be achieved without sacrificing the accuracy.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Design of Bidirectional Antenna Array With Adjustable Endfire Gains
    • Authors: Huadong Guo;Wen Geyi;
      Pages: 1656 - 1660
      Abstract: The endfire gains of bidirectional antenna arrays reported previously are not adjustable. A method for controlling the gain distribution of bidirectional antenna array is presented in this letter. By introducing a weighted diagonal matrix into the method of maximum power transmission efficiency, the optimized excitations for the antenna elements can be obtained to realize the desired distribution for the endfire gains in the two opposite directions of a bidirectional antenna array. To demonstrate the feasibility of the method, a four-element printed bidirectional dipole array is designed and fabricated. Compared with the conventional designs using dipole elements, the optimized dipole antenna array can achieve a desired distribution of endfire gains with reduced size and enhanced gain. The simulated and measured results show that the endfire gain in one direction varies from 1.5 to 10.2 dBi at 2.45 GHz as the ratio of weights changes from 0 to 1. The endfire gain reaches 9.3 dBi when the radiation patterns are equally excited in both directions.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • A Dipole-Moment-Based Formulation for Numerically Efficient Analysis of
           Scattering From Truncated Periodic Structures
    • Authors: Kapil Sharma;Raj Mittra;
      Pages: 1661 - 1665
      Abstract: Numerical analysis of truncated periodic structures by utilizing conventional method of moments (MoM) technique is challenging because the number of unknowns involved is often very large; hence, the computational cost is high. This letter presents a novel approach, based on the dipole moment (DM) method, for analyzing electromagnetic scattering from truncated periodic structures whose geometrical and/or material properties vary locally from those of a strictly doubly infinite periodic structure. The main advantage of using the DM method is that it provides convenient closed-form expressions for the scattered fields, facilitating the matrix computation in the context of the MoM much more efficiently than when the conventional Rao–Wilton–Glisson (RWG) type of basis functions are used for the same computation. Numerical results obtained by using the proposed approach are compared with those derived from a commercial MoM software package, and good agreement is found. The time advantage is clearly evident from this comparison.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • An Integrated Shark-Fin Antenna for MIMO-LTE, FM, and GPS Applications
    • Authors: Ying Liu;Zhuang Ai;Guifeng Liu;Yongtao Jia;
      Pages: 1666 - 1670
      Abstract: A roof automobile antenna for Long Term Evolution, navigation system, and frequency modulation (FM) applications is presented. The proposed antenna is installed in shark-fin housing on the roof of a car, which includes a 4G (the fourth generation mobile communication system) main antenna, 4G diversity antenna, navigation antenna, and FM antenna. Some miniaturization and multiband techniques are utilized to fit the available space of the shark-fin housing, such as the grounded and parasitic radiating elements, meandered radiating elements, and lumped elements. It is worth noting that the proposed 4G main antenna with a compact size of 55 mm × 25 mm × 2 mm can cover two wide bands including 698–960 MHz and 1710–2690 MHz. Both the main antenna and diversity antenna have omnidirectional radiation patterns in the azimuthal plane. All the designs are planar printed antennas fully integrated into the printed circuit board, which significantly reduces the cost. The simulation and measurement results are in good agreement.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • A Miniaturized Microstrip Antenna Array at 5G Millimeter-Wave Band
    • Authors: Xiumei Shen;Yujia Liu;Luyu Zhao;Guan-Long Huang;Xiaowei Shi;Qiulin Huang;
      Pages: 1671 - 1675
      Abstract: A miniaturized two-element microstrip antenna array is proposed for the millimeter-wave band of fifth generation (5G) wireless communication systems. A surface of electromagnetic bandgap structures (EBG) is applied as the ground for two closely packed patch antennas operating in 5G New Radio (26 500–29 500 MHz) frequency band. With the help of the proposed EBG ground, the two E-shaped microstrip antenna elements can be placed in close proximity to each other by 0.3 wavelength center to center distance in free space at the center frequency, yet the mutual coupling between them can still reach to more than 23 dB within the whole band of interest, which is about 10 dB larger than that on normal ground. All major radiation characteristics of the two-element array are well reserved with the EBG ground. The proposed design can be used in multiple-input-multiple-output applications or as the building subarray of larger phased arrays at millimeter-wave bands for mobile communication systems.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • A Wideband Low-Profile Monopulse Feeder Based on Silicon Micromachining
           Technology for W-Band High-Resolution System
    • Authors: Fan Zhao;Yu Jian Cheng;Peng Fei Kou;Shi Sen Yao;
      Pages: 1676 - 1680
      Abstract: A wideband low-profile monopulse feeder at the W-band based on the silicon micromachining technology is investigated in this letter. The proposed monopulse feeder consists of four stepped horn elements as the radiating antenna array and four Magic-Tees as the comparator network for generating SUM and DIFF beams. In order to achieve the features of wide working bandwidth and low profile, a series of special structures are employed, such as a ridged structure and a metallic reduced-height waveguide, in Magic-Tees. The total thickness of this feeder is 2.65 mm (0.80λ), which includes six metallic layers. Then, the feeder is fabricated and experimented. This feeder has a working bandwidth of 21.7% (from 80.4 to 100 GHz) for ports 1 and 2, while a working bandwidth of 15% for port 3. More than 13.5 dBi is maintained for the gain of SUM patterns, and all gain ratios of SUM and DIFF beams are within 3.2 dB in the working bandwidth. The result indicates that this kind of feeder can be an excellent candidate for the W-band high-resolution system.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Wideband Millimeter-Wave Antenna With Low Cross Polarization Based on
           Spoof Surface Plasmon Polaritons
    • Authors: Qing-Le Zhang;Bao-Jie Chen;Qian Zhu;Ka Fai Chan;Chi Hou Chan;
      Pages: 1681 - 1685
      Abstract: A novel wideband millimeter-wave antenna with low cross polarization based on spoof surface plasmon polaritons (SPPs) is proposed in this letter. Periodic metallic grooves operate as an SPP transmission line with high electromagnetic field confinement. The concept of dielectric tapered rod antenna is employed to design an SPP rod antenna with linear-tapered groove depth, converting the confined energy to radiation mode. Meanwhile, the tapered structure only affects the $E_{z}$ component on the transverse plane, and thus it can achieve low cross polarization. This prototype is fabricated by three-dimensional printing technique and surface metallization process. The radiating length of the linear-tapered SPP antenna is 29.2 mm, and the measured |S11| is below −15.6 dB from 50 to 75 GHz. Experimental results show that the linear-tapered antenna can achieve an average gain of 14.95 dBi with ±1.45 dBi variation and better than −25.6 dB cross-polarization level for E-plane radiation.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Isolation Enhancement in Closely Coupled Dual-Band MIMO Patch Antennas
    • Authors: Zicheng Niu;Hou Zhang;Qiang Chen;Tao Zhong;
      Pages: 1686 - 1690
      Abstract: This letter presents a closely coupled dual-band multiple-input–multiple-output (MIMO) patch antenna that resonates at 3.7 and 4.1 GHz. The MIMO antenna is composed of two mirror-symmetrical single-feed patch antennas that are closely placed with approximately 0.034 λ0 (where λ0 is the wavelength at 3.7 GHz). The decoupling structure consists of the modified array antenna decoupling surface (MADS) and H-shaped defect ground structures for the lower band and upper band, respectively. Through simulation and measurement, the isolation is determined to be greater than 30 dB in both frequency bands, showing a noticeable improvement compared to the original antenna array. Under the effect of the MADS, the measured gain increases by 2.2 and 0.8 dB at the resonance frequencies of 3.7 and 4.1 GHz, respectively. The measured results indicate that the proposed decoupling structure is quite suitable for closely spaced dual-band MIMO antennas.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Frequency-Reconfigurable Antenna Inspired by Origami Flasher
    • Authors: Sukwon Lee;Syed Imran Hussain Shah;Han Lim Lee;Sungjoon Lim;
      Pages: 1691 - 1695
      Abstract: This letter proposes a frequency-reconfigurable dipole antenna using an origami flasher. The dipole antenna is designed on flat paper in the unfolded state, and the paper can then be folded into a cube inspired by the origami flasher. Dipole length is extended in the folded state due to the patch pole, which acts as a dummy in the unfolded state. The proposed origami antenna can switch resonance frequency from 1.23 to 0.77 GHz by folding the paper. Measured return losses are 11.6 and 13.9 dB, peak gains are −0.48 and −3.41 dBi, and efficiencies are 90% and 20% at each resonance frequency in the unfolded and folded states, respectively.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Thermally Beam-Direction- and Beamwidth-Switchable Monopole Antenna Using
           Origami Reflectors With Smart Shape Memory Polymer Hinges
    • Authors: Syed Imran Hussain Shah;Sungjoon Lim;
      Pages: 1696 - 1700
      Abstract: This letter presents a thermally reconfigurable antenna with beam-direction- and beamwidth-switching capability using origami reflectors with smart shape memory polymer (SMP) hinges. The proposed antenna consists of a single monopole antenna with four origami reflectors. We employ SMP hinges to actuate the origami reflectors. When all origami reflectors are unfolded on the ground plane (Mode I), the monopole antenna exhibits omnidirectional radiation because the reflectors operate as dummies. When two origami reflectors are folded perpendicular to the ground plane, forming a corner reflector (Mode II), the proposed antenna operates as a directional antenna. Beam direction can be switched to 45°, 135°, 225°, and 315° by actuating various origami reflector pairs, with increased peak gain from 4.5 dBi (Mode I) to 11 dBi (Mode II). When one origami reflector is folded perpendicular to the ground plane (Mode III), the 3 dB beamwidth increases from 52° (Mode II) to 140° (Mode III). Beam direction of Mode III can also be switched through 0°, 90°, 180°, and 270° by actuating each origami reflector. The proposed antenna performance was successfully demonstrated from electromagnetic simulation and measurement.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
  • Broadband Band-Absorptive Frequency-Selective Rasorber With a Hybrid 2-D
           and 3-D Structure
    • Authors: Weiliang Yu;Guo Qing Luo;Yufeng Yu;Zhen Liao;Huayan Jin;Zhongxiang Shen;
      Pages: 1701 - 1705
      Abstract: A novel frequency-selective rasorber (FSR) with a broad absorption band is proposed in this letter. The proposed FSR is realized by vertically cascading a two-dimensional (2-D) lossy layer with a 3-D band-stop frequency-selective structure (FSS).  The 2-D lossy layer is composed of meandered square loops loaded with lumped resistors, and the 3-D band-stop FSS is constructed by parallel-plate waveguide arrays (PPWAs) stacked along the TE polarization direction (linear polarization perpendicular to the PPW). The band-absorptive FSR exhibits an absorption band (|S11| ≤ –10 dB and |S21| ≤ –10 dB) from 7.85 to 12.85 GHz and a low-pass band (|S21| ≥ –1 dB) up to 3.8 GHz. Its transition efficiency of the transition band (FRap) is 2.1. A prototype is fabricated, and its measured results show that the proposed FSR has a low loss and flat low-pass band, a wide absorption band with high selectivity, and a steep transition band between the low-pass band and absorption band.
      PubDate: Aug. 2019
      Issue No: Vol. 18, No. 8 (2019)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
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