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  Subjects -> ELECTRONICS (Total: 175 journals)
Showing 1 - 200 of 277 Journals sorted alphabetically
Acta Electronica Malaysia     Open Access  
Advances in Biosensors and Bioelectronics     Open Access   (Followers: 7)
Advances in Electrical and Electronic Engineering     Open Access   (Followers: 5)
Advances in Electronics     Open Access   (Followers: 76)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Microelectronic Engineering     Open Access   (Followers: 13)
Advances in Power Electronics     Open Access   (Followers: 33)
Advancing Microelectronics     Hybrid Journal  
Aerospace and Electronic Systems, IEEE Transactions on     Hybrid Journal   (Followers: 305)
American Journal of Electrical and Electronic Engineering     Open Access   (Followers: 24)
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: 13)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 28)
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: 35)
Biomedical Instrumentation & Technology     Hybrid Journal   (Followers: 6)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
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: 44)
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: 253)
Edu Elektrika Journal     Open Access   (Followers: 1)
Electrica     Open Access  
Electronic Design     Partially Free   (Followers: 104)
Electronic Markets     Hybrid Journal   (Followers: 7)
Electronic Materials Letters     Hybrid Journal   (Followers: 4)
Electronics     Open Access   (Followers: 85)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 10)
Electronics For You     Partially Free   (Followers: 91)
Electronics Letters     Hybrid Journal   (Followers: 26)
Elkha : Jurnal Teknik Elektro     Open Access  
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 50)
Energy Harvesting and Systems     Hybrid Journal   (Followers: 4)
Energy Storage Materials     Full-text available via subscription   (Followers: 2)
EPJ Quantum Technology     Open Access  
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: 185)
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 4)
IACR Transactions on Symmetric Cryptology     Open Access  
IEEE Antennas and Propagation Magazine     Hybrid Journal   (Followers: 96)
IEEE Antennas and Wireless Propagation Letters     Hybrid Journal   (Followers: 77)
IEEE Journal of Emerging and Selected Topics in Power Electronics     Hybrid Journal   (Followers: 46)
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: 65)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 69)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 55)
IEEE Transactions on Circuits and Systems for Video Technology     Hybrid Journal   (Followers: 19)
IEEE Transactions on Consumer Electronics     Hybrid Journal   (Followers: 39)
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: 70)
IEEE Transactions on Signal and Information Processing over Networks     Full-text available via subscription   (Followers: 11)
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 Microwaves, Antennas & Propagation     Hybrid Journal   (Followers: 35)
IET Nanodielectrics     Open Access  
IET Power Electronics     Hybrid Journal   (Followers: 45)
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: 57)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 24)
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: 12)
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: 5)
International Journal of Computational Vision and Robotics     Hybrid Journal   (Followers: 6)
International Journal of Control     Hybrid Journal   (Followers: 12)
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: 2)
International Journal of High Speed Electronics and Systems     Hybrid Journal  
International Journal of Image, Graphics and Signal Processing     Open Access   (Followers: 14)
International Journal of Microwave and Wireless Technologies     Hybrid Journal   (Followers: 8)
International Journal of Nano Devices, Sensors and Systems     Open Access   (Followers: 12)
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: 24)
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: 10)
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: 23)
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: 4)
Journal of Energy Storage     Full-text available via subscription   (Followers: 4)
Journal of Field Robotics     Hybrid Journal   (Followers: 2)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 162)
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: 9)
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: 28)
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 Rekayasa Elektrika     Open Access  
Jurnal Teknik 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: 18)
Nanotechnology Magazine, IEEE     Full-text available via subscription   (Followers: 33)
Nanotechnology, Science and Applications     Open Access   (Followers: 6)
Nature Electronics     Hybrid Journal  
Networks: an International Journal     Hybrid Journal   (Followers: 6)
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)
Security and Communication Networks     Hybrid Journal   (Followers: 2)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 53)
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: 75)
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 13)
Solid-State Electronics     Hybrid Journal   (Followers: 9)
Superconductor Science and Technology     Hybrid Journal   (Followers: 2)
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: 8)
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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Journal Cover
IEEE Antennas and Wireless Propagation Letters
Journal Prestige (SJR): 1.047
Citation Impact (citeScore): 4
Number of Followers: 77  
  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: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Sectioning-Based ADMM Imaging for Fast Node Communication With a
           Compressive Antenna
    • Authors: Juan Heredia-Juesas;Ali Molaei;Luis Tirado;José Á. Martínez-Lorenzo;
      Pages: 226 - 230
      Abstract: In this letter, a novel norm-1 regularized imaging technique, based on the alternating direction method of multipliers (ADMM) algorithm, is presented. This technique divides the sensing matrix of the imaging system in submatrices by columns. This method is capable of imaging metallic targets with a reduced amount of measurements, by sectioning the imaging domain into several regions and optimizing them individually in different nodes. This technique reduces the amount of information to be shared among the nodes, compared to the consensus ADMM that divides the sensing matrix into submatrices by rows. This makes the communication among the nodes faster for large imaging domains that need to be distributed into several computational nodes of a cluster. A compressive reflector antenna (CRA) has been recently proposed as a low cost hardware to provide high sensing capacity. The use of the columnwise division ADMM algorithm in combination with the imaging capabilities of the CRA allows a distributed and quasi-real-time imaging, while reducing the communications among the computational nodes.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • A Dual Circular-Polarized Extremely Thin Monopulse Feeder at W-Band for
           Prime Focus Reflector Antenna
    • Authors: Peng Fei Kou;Yu Jian Cheng;
      Pages: 231 - 235
      Abstract: A thin monopulse feeder is very important in a radar system with strict profile limitation. Besides, to implement polarization-agile radar, a monopulse feeder with two orthogonal polarizations is required to synthesize an arbitrary polarization. To achieve these requirements, a dual circular-polarized extremely thin monopulse feeder at W-band is investigated and realized for a prime focus reflector antenna, which can be used in a tri-mode seeker. To begin with, two kinds of the 2 × 2 substrate integrated waveguide (SIW) slot antenna array topologies are discussed based on the standard of circular polarization efficiency. After that, the better one integrated with a compact and single-layer SIW comparator is used to feed the reflector antenna. The total thickness of the developed feeder is only 0.56 mm. For a prime focus 140 mm diameter reflector antenna with the blockage of a diameter of 40 mm, the measured gain of the entire antenna system is 35.6 dBi at 94 GHz. The DIFF-beam null depth is −20.1 dB in xoz plane and −20.5 dB in yoz plane. The gain ratios of the SUM- and DIFF-pattern are 3.5 dB in xoz plane and 4 dB in yoz plane. The results show that this type of antenna has great prospects in a monopulse tracking system with polarization agile function.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Switched-Beam Endfire Planar Array With Integrated 2-D Butler Matrix for
           60 GHz Chip-to-Chip Space-Surface Wave Communications
    • Authors: Prabhat Baniya;Kathleen L. Melde;
      Pages: 236 - 240
      Abstract: A two-dimensional Butler matrix feed network is designed, implemented, and integrated with a 60 GHz 2 × 2 circular patch planar array for chip-to-chip communications. The realized antenna module is a thin multilayer microstrip structure with a footprint small enough to fit over a typical multicore chip. The network enables endfire (azimuthal) scan of the array main beam in the four diagonal directions, which is demonstrated for the first time in this letter. The antenna module provides a seamless and practical way to achieve reconfigurable interchip communication in multicore multichip (MCMC) systems. A hybrid space-surface wave interconnect is proposed that takes advantage of surface-wave coupling. The matrix is a four-input, four-output, i.e., 4 × 4, network consisting of four interconnected quadrature (90$^circ$) hybrid couplers. A multiantenna module (MAM) consisting of five antenna modules that emulates diagonal interchip communication in MCMC systems is fabricated. The simulation and measurement of transmission coefficients between the antenna modules on the MAM are performed and compared.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Propagation Experiment at Ka-Band in French Guiana: First
           Year of Measurements
    • Authors: Xavier Boulanger;Bouchra Benammar;Laurent Castanet;
      Pages: 241 - 244
      Abstract: ONERA, the French Aerospace Lab, and CNES, the French Space Agency, are currently running a Ka-band propagation experiment at the Guiana Space Centre (CSG) in Kourou (French Guiana). A rain gauge and a beacon receiver able to record the 20.2 GHz beacon signal of the Amazonas 3 satellite have been deployed. The equipment is operational since January 1, 2017, and the duration of the experiment has been set to three years. This letter addresses some results of the first year of measurements (from January 2017 to December 2017). The annual and monthly complementary cumulative distribution functions of rainfall rate and rain attenuation are presented as well as a comparison with the rain attenuation prediction method recommended in ITU-R P.618-13.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Wideband Beam Steering Antenna Array of Printed Cavity-Backed Elements
           With Integrated EBG Structure
    • Authors: Artem R. Vilenskiy;Vladimir I. Litun;Konstantin V. Lyulyukin;
      Pages: 245 - 249
      Abstract: The letter concerns the design of a wideband printed antenna array element based on a cavity-backed patch radiator with an incorporated U-slot. An additional 2 × 3 mushroom-like electromagnetic bandgap structure is introduced in the E-plane in close proximity to the patch element on the same single-layer substrate. The proposed array unit cell design is optimized for operation in the 12% relative bandwidth in C-band and the 80° conical beam steering sector. Both simulated and experimental data demonstrate considerable wideband beam steering performance improvement compared to the basic design (without isolating structure) characteristics, provided by achieved array elements decoupling. Research results predict for the 12% relative bandwidth broadside reflection coefficient magnitude |Γ| ≤ 0.3, and maximum for the 80° conical beam steering sector |Γ| ≤ 0.37.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Design and Validation of Flexible Multilayer Frequency Selective Surface
           With Transmission Zeros
    • Authors: Bian Wu;Hui-Ling Li;Yu-Tong Zhao;Yue-Lin Wang;Wei-Bing Lu;Liang Chen;
      Pages: 250 - 254
      Abstract: The design, analysis, and validation of a flexible multilayer frequency selective surface (MFSS) with two transmission zeros at the upper side of the passband is presented. The MFSS unit cell is composed of two metallic quasi-Jerusalem-cross patterns on the top and the bottom layers, a metallic slot coupling aperture on the middle layer, and two flexible polyimide-Teflon supported substrates. The equivalent circuit is derived to explain the principle of transmission poles and zeros. This MFSS exhibits a good resonance stability for different polarization and incident angles. A prototype flexible MFSS centered at 21.6 GHz is fabricated and measured, which shows an insertion loss of 1.3 dB and a fractional bandwidth of 15.7%. The stable performances of the MFSS at oblique incidences and under different bent conditions for TE and TM polarization are demonstrated as well.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • A Low-Profile, Directional, Ultrawideband Antenna
    • Authors: Juelin Liu;Junping Geng;Kun Wang;Ziheng Ding;Jianping Li;Xiaonan Zhao;Ronghong Jin;Xianling Liang;Weiren Zhu;
      Pages: 255 - 259
      Abstract: A compact, low-profile, ultrawideband (UWB) antenna providing directional radiation pattern is proposed. The antenna is based on a modified Vivaldi antenna and is characterized by a three-dimensionally bended structure. Each of the two radiation fins is capacitively loaded with an invert trapezoidal metallic plate at the end. In order to conveniently mount the antenna on the metal surface, a corrugated plate is added as a ground. Owing to the bended structure and capacitively loaded scheme, the antenna has a low profile of 0.216$lambda _m$, where $lambda _m$ is the wavelength at the minimum operating frequency. The prototype of the antenna is fabricated and measured. The measured and simulated results show good agreement. The measured results show that the antenna has VSWR $< $ 2.5 from 0.9 to 10 GHz and measured gain from 3.6 to 8.2 dBi.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • A Novel Calibrator for Radar Cross Section Measurement
    • Authors: Zhiping Li;Jianhua Wu;Zhengpeng Wang;Siran Wang;Guoyu He;
      Pages: 260 - 263
      Abstract: Calibration is essential for the radar cross section (RCS) measurement, and the characteristics of calibrator have a significant effect on the calibration accuracy. A novel calibrator suitable for the metal pylon is presented in this letter. The most attractive advantage of the new calibrator is that its RCS is insensitive to the elevation in comparison with the right circular cylinder. In addition, the novel calibrator can be easily installed on the head of the metal pylon, and the approximate solution of the RCS exists. What is more, the target-support interaction of the novel calibrator is no larger than the amount of the comparable-sized cylinder. These advantages of the calibrator are demonstrated by some full-wave simulations.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Polarization-Diverse Holographic Metasurfaces
    • Authors: Subramanian Ramalingam;Constantine A. Balanis;Craig R. Birtcher;Hussein N. Shaman;
      Pages: 264 - 268
      Abstract: This letter presents the design and fabrication of polarization-diverse metasurface leaky-wave antennas that are composed of simple isotropic square patches. Multiple vertical monopoles are employed to excite the metasurface. Each source, or a combination of sources, is designed to enable the metasurface to form a pencil beam with the desired horizontal, vertical, or circular polarization. A prototype of the antenna was realized, using a 3.175 mm thick substrate of dielectric constant 2.2, to operate at 12 GHz. It is also shown that, by employing only backward leaky waves to form the pencil beam, frequency scanning with a much larger scan-angle range can be achieved.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Design of a Quad-Polarization-Agile Antenna Using a Switchable Impedance
    • Authors: Hucheng Sun;Zhiqiang Pan;
      Pages: 269 - 273
      Abstract: This letter presents a novel quad-polarization-agile aperture-coupled antenna using a reconfigurable impedance converter. The designed reconfigurable converter can achieve impedance and phase changes under the control of p-i-n diodes. Based on this converter, a quad-mode switchable feeding network can be produced. Utilizing the feeding network to excite a dual-polarized aperture-coupled patch antenna, polarization reconfigurability is realized. By switching the p-i-n diodes, two orthogonal linear polarizations (LPs) and two orthogonal circular polarizations can be generated. Measurement results show that its return-loss bandwidth is wider than 2.5% at LP modes, its axial-ratio bandwidth is better than 1.8%, and its cross polarizations are below –20 dB for all the states.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Two-Dimensional Imaging Based on Near-Field Focused Array Antenna
    • Authors: Peng-Fa Li;Shi-Wei Qu;Shiwen Yang;
      Pages: 274 - 278
      Abstract: In this letter, a near-field focused array antenna is applied to two-dimensional microwave imaging, which steers its focus on the designed focal plane by changing the operating frequency and by phase control in two directions, respectively. The imaging system is composed of this array and two microstrip antennas, as receiver and transmitters, respectively. Simulations and measurements have proved the feasibility of the image reconstruction approach. The proposed method has a high imaging speed due to fast electrical beam scan, and thanks to the frequency scan performance of the array in one dimension, it also shows a low-cost property against the fully phased method.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • An Anisotropic Thin Dielectric Sheet Method for Analysis of Magnetized
    • Authors: Ling Guan;Shifei Tao;Ying Zhao;Rushan Chen;
      Pages: 279 - 282
      Abstract: This letter presents a thin dielectric sheet (TDS) method for the analysis of electrostatic or magnetostatic biased graphene. As the conductivity of graphene under magnetostatic bias is a tensor, this TDS is proposed to analyze this anisotropic medium. In addition, the TDS method only needs to mesh the surface of the target while the volume integral equation method needs especially fine mesh, which will cost a large consumption of time and memory. Numerical examples are demonstrated to further validate the accuracy and efficiency of the TDS method.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Truncation-Error Reduction in Antenna Near-Field Measurements Using an
           Overcomplete Basis Representation
    • Authors: Marco Donald Migliore;Marco Salucci;Paolo Rocca;Andrea Massa;
      Pages: 283 - 287
      Abstract: A novel method for the reduction of the truncation error in near-field measurements is proposed. The approach is based on an overcomplete representation of the field generated from a suitable “modeling” of the uncertainties affecting the antenna under test and on the successive selection of a suitable set of basis functions by means of the orthogonal matching pursuit method. Selected numerical and experimental results confirm the effectiveness of the proposed technique.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • A Wearable PIFA With an All-Textile Metasurface for 5 GHz WBAN
    • Authors: Guo-Ping Gao;Chen Yang;Bin Hu;Rui-Feng Zhang;Shao-Fei Wang;
      Pages: 288 - 292
      Abstract: In this letter, a wearable all-textile metasurface antenna (MSA) for 5 GHz wireless body area network (WBAN) applications is proposed. All the components of the proposed MSA are made of the comfort textile materials. A metasurface with high permittivity values is placed right above a wide-bandwidth planar inverted-F antenna to realize size miniaturization and gain enhancement. The proposed MSA has a profile of 4 mm (0.07λ0) and occupies an area of 42 mm × 28 mm (0.77λ0 × 0.51λ0). Moreover, this antenna realizes a measured peak gain of 6.70 dBi, an average efficiency of 77%, and an operating band from 4.96 to 5.90 GHz that covers the 5 GHz WBAN band. In addition, the on-body studies show that the MSA is suitable for wearable applications.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Automatic Topology Generation of 21 Bit Chipless Radio Frequency
           Identification Tags Using a Noniterative Technique
    • Authors: Yen-Sheng Chen;Tong-Yang Jiang;Fei-Peng Lai;
      Pages: 293 - 297
      Abstract: A design technique is proposed for the topology generation of chipless radio frequency identification (RFID) tags. When the capacity of chipless RFID is as high as 21 bits, the chipless tag consists of numerous closely spaced resonators, and mutual coupling incurs increasing numbers of design variables. Thus, synthesizing the resonant frequencies requires iterative simulations that fine-tune the design variables. As millions of items need to be mapped, the design of the high-capacity system is time-consuming. In this letter, a design methodology that does not need iterative optimization procedures is presented. This feature is implemented through three mechanisms. First, the half-wave slot is determined as the resonator for the tag. This resonator depicts the advantage of narrowband and harmonic rejection, yet it is simple in geometry. Second, the mutual coupling between the resonators is reduced through isolated ground planes. Third, a response surface model is formulated, and the resonant frequencies can be synthesized using the model without performing additional simulation. The proposed technique is verified through simulation and measurement. Thirty-five samples are transformed into the tag topologies. The results indicate that a reliability of 100% is achieved for these samples.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Dual-Band Dual-Polarized Quasi-Elliptic Frequency Selective Surfaces
    • Authors: Binchao Zhang;Cheng Jin;Xiuzhu Ye;Raj Mittra;
      Pages: 298 - 302
      Abstract: A structure for the design of dual-band dual-polarized quasi-elliptic frequency selective surfaces (FSSs) is proposed in this letter, whose unit cell is composed of multiple arrays of cylindrical dielectric resonators with capped annular ring resonators inserted in a perforated metallic plate. The designed FSS provides quasi-elliptic filtering responses with two transmission poles (TPs) in the passbands and two transmission zeros (TZs) in the upper stopbands. So does it for an incident wave with either TE- or TM-polarization in each band. In addition, the frequency responses including center frequencies, TPs/TZs, and the input impedance of the propagating path matched to the free space in each band can be tuned separately to achieve the best filtering performance.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • A Differentially Fed Dual-Polarized Slot Antenna With High Isolation and
           Low Profile for Base Station Application
    • Authors: Ying Liu;Sihao Wang;Xiaodong Wang;Yongtao Jia;
      Pages: 303 - 307
      Abstract: In this letter, a low-profile differentially fed dual-polarized slot antenna is proposed for base station application. Its radiator is an octagon patch etched with two normal H-shaped slots. The folded feeding line is introduced to accommodate the differentially fed scheme and tune impedance matching. Both high isolation and stable radiation patterns are realized by using the differential feeding technique. Measured results demonstrate that the impedance bandwidths (VSWR < 1.5) of the two polarizations are 19.3% (3.14–3.81 GHz) and 20.3% (3.10–3.80 GHz), respectively. The proposed antenna has a high isolation of larger than 43 dB over the entire operation band. The measured gain is higher than 8.1 dBi within the operating frequency.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Reduced-Order Model With Equivalence Surface for Scattering Problems
    • Authors: Hui H. Gan;Qi I. Dai;Tian Xia;Qin Liu;Weng Cho Chew;
      Pages: 308 - 312
      Abstract: A reduced-order model for analyzing scattering problems with surface integral equation method is proposed in this letter. An equivalent surface (ES) is introduced to enclose the scatterer and the corresponding interaction matrix between the ES and the scatterer is generated. A series of eigenvectors is obtained by performing randomized singular-value decomposition to the matrix. According to the equivalence principle, the wave input–output relation of the scatterer is encapsulated by a limited number of eigenvectors with a given truncation error, which can be precomputed and reused when the location of radiator changes but the scatterer does not. In addition, discrete empirical interpolation method is applied to further accelerate the calculation of the interaction between the radiator and the background. Numerical examples are provided to demonstrate the efficiency and accuracy of the proposed scheme.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Single-Layer Multi-Via Loaded CRLH Leaky-Wave Antennas for Wide-Angle Beam
           Scanning With Consistent Gain
    • Authors: Debabrata K. Karmokar;Shu-Lin Chen;Trevor S. Bird;Yingjie Jay Guo;
      Pages: 313 - 317
      Abstract: Achieving continuous backward-to-forward wide-angle beam scanning with consistent gain by employing composite right/left-handed (CRLH) leaky-wave antennas (LWAs) is reported. For structural and design simplicity, a single-layer one-dimensional structure is considered in which each unit cell consists of a patch shorted centrally to the ground plane. It was found that, when using only one via at the center of a unit cell, a continuous beam scan requires a large-diameter via when all other parameters remain unchanged. To eliminate this limitation while maintaining a single-layer structure, novel unit cells are proposed using multiple vias in each unit cell. An LWA design for continuous beam scan with three vias in each unit cell is investigated, and the results show good performance and design flexibility. A prototype antenna has been realized, and the measured results show that the antenna can scan the radiation beam continuously in a wide range, from −60° to +66° with a consistent gain. The measured gain variation within the scan range is only 2.9 dB, and the 3 dB gain bandwidth is 58.6%.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Scattered EM-Wave Shaping Using Combination of Cross-Polarization
           Conversion and Reflection Phase Cancellation
    • Authors: Mustafa K. Taher Al-Nuaimi;Yejun He;Wei Hong;
      Pages: 318 - 322
      Abstract: The design of millimeter-wave 1 bit coding engineered reflector for backscattered electromagnetic (EM)-wave shaping by combining both cross-polarization conversion and reflection phase cancellation principles is presented in this letter. The anisotropic unit cell of the presented engineered reflector can efficiently rotate the polarization of an incident EM wave to its orthogonal one at millimeter-wave regime. Each unit cell has four inverted L-shaped copper resonators on the top side of a PEC-backed dielectric substrate. The proposed unit cell has three plasmon resonance frequencies at 87.3, 90.1, and 91.8 GHz with 100% cross-polarization conversion efficiency at these frequencies, and more than 92.1% from about 86.7 to 91.9 GHz. Moreover, if the proposed anisotropic unit cell (“0” element) along with its mirrored one (“1” element) are arranged in one engineered reflector, a 180° ± 25° reflection phase difference is valid between their reflection phases and engineered reflectors that can efficiently manipulate the reflected EM-wave and generates many kinds of scattering patterns such as two lobes, three lobes, four lobes, or even a diffuse scattering pattern can be composed using only those two unit cells. Full-wave simulation, fabrication, and experimental characterization results are presented.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Dispersion-Engineered Transmission Line Loaded Slot Antenna for UWB
    • Authors: Princy Maria Paul;Krishnamoorthy Kandasamy;Mohammad S. Sharawi;Basudev Majumder;
      Pages: 323 - 327
      Abstract: A transmission line (TL) loaded, compact, ultrawideband (UWB) square slot antenna is proposed in this letter. The square slot is a microstrip line fed and loaded with an array of periodically perturbed TLs to achieve a UWB response from 2.1 to 11.5 GHz. The slot is designed to resonate at 2.6 GHz. The TLs are dispersion engineered to resonate at several frequencies so as to provide a wideband response. Loading of the engineered TLs on the square slot produced multiple resonances without affecting the fundamental mode of the slot antenna. The proposed antenna design is analyzed using dispersion relations and equivalent circuits. The proposed antenna is fabricated on an RT/Duroid 5880 substrate with a size of 50 × 50 × 1.52 mm3. The antenna performance metrics, such as impedance bandwidth, gain, and efficiency, are experimentally verified. Good agreement is obtained between simulated and measured results.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • A Convoluted Structure for Miniaturized Dual-Bandstop Frequency Selective
    • Authors: Yuhong Ma;Weiwei Wu;Ye Yuan;Ximeng Zhang;Naichang Yuan;
      Pages: 328 - 332
      Abstract: A miniaturized dual-bandstop frequency selective surface (FSS) using convoluted structures is proposed in this letter. The working central frequencies of the proposed FSS are 2.66 and 5 GHz with −3 dB bandwidths of 1.5 and 1.2 GHz, respectively. The side length of the unit cell is 6.88 mm, which is about 5.9% of the wavelength at the first working frequency. The equivalent circuit and current distributions are introduced to explain the FSS frequency performance. The effects of the geometrical parameters on the frequency response of the FSS are studied. The simulated results show that the ratio of the frequencies of the two working transmission zeros can be tuned over a wide range. A prototype of the proposed FSS is fabricated and measured. The simulation and measured results show that the working frequencies, the bandwidths of the passband, and two stopbands of the proposed FSS perform excellent stabilities under different polarizations and incidence angles. This FSS is a good candidate to isolate the wireless networks.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Adaptation of Babinet's Principle for Complementary Antennas in a
           Dielectric Half-Space
    • Authors: Stephen F. Bass;Jessica E. Ruyle;
      Pages: 333 - 337
      Abstract: Babinet's principle is widely known to relate the impedances of complementary structures. However, the usefulness of the principle is fundamentally limited by the requirement that the complementary structures be in homogeneous media—preventing its use for modern printed-circuit-board-style constructed antennas with a dielectric backing. This letter shows a modification of Babinet's principle to describe the impedance relationship of complementary structures in a dielectric half-space, providing a deeper theoretical understanding of complementary structure behavior. This provides a first step toward an analytical solution for the Babinet's principle applied to finite dielectric backings.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • X/Ku Dual-Band Single-Layer Reflectarray Antenna
    • Authors: Tao Su;Xiangjie Yi;Bian Wu;
      Pages: 338 - 342
      Abstract: In this letter, X/Ku dual-band single-layer reflectarray antenna is presented. The proposed reflectarray antenna operates in two separated bands with separate feeds. The reflectarray element is composed of a split ring with two phase delay lines and a phoenix patch. The split ring and phoenix patch are designed for operation at X- and Ku-bands, respectively. The split ring is selected as the lower frequency element because of the large enough internal space. The phase shift of these two elements does not depend on variation of external size, which provides a feasible method for designing dual-band elements. The lower band phase shift is obtained by changing the rotation angle of the phase delay lines. The movement of the inner loop of phoenix patch provides the required phase shift for the higher band. The proposed element realizes 360° phase shift range in both bands. The reflectarray is fabricated and measured to validate the design. The measured gains are 22.9 dBi at 8.5 GHz with aperture efficiency of 40%, and 28.8 dBi at 16 GHz with aperture efficiency of 44.8%. Besides, the 1 dB gain bandwidths are 20.5% (7.9–9.7 GHz) at lower band and 13.3% (14.7–16.8 GHz) at higher band.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Compact Self-Diplexing Antenna Using Dual-Mode SIW Square Cavity
    • Authors: Arani Ali Khan;Mrinal Kanti Mandal;
      Pages: 343 - 347
      Abstract: This letter presents a substrate-integrated-waveguide-based compact, dual-mode self-diplexing antenna. A single square cavity with a rectangular ring slot is used for both dual-mode excitation and radiation. A prototype diplexing antenna is fabricated that radiates linear, orthogonal polarization at 9.5 and 10.5 GHz. The measured peak gains at the two frequencies are 5.75 and 5.95 dBi, respectively. Intermodal coupling between the modes provides two transmission zeros, which are utilized to achieve port isolation better than 29 dB. The proposed technique can be used for closely spaced radiating frequencies. As no external filter is used, the structure is compact. Furthermore, because of the slot loading effect, the antenna is smaller than a recently published antenna claimed as the most compact antenna. Its working principle is discussed in detail. Finally, design guidelines are suggested.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • A Dual-Polarized Linear Antenna Array With Improved Isolation Using a
           Slotline-Based 180° Hybrid for Full-Duplex Applications
    • Authors: Yi-Ming Zhang;Shuai Zhang;Jia-Lin Li;Gert Frølund Pedersen;
      Pages: 348 - 352
      Abstract: This letter presents a simple and compact dual-polarized linear antenna array characterizing high interport isolation for in-band full-duplex communications. By using the symmetrically shared-interface configuration integrated with a 180° hybrid, the self-interference resulting from the impedance mismatching between the antenna and feeding network and the coupling among the antenna elements can be well suppressed theoretically. Furthermore, to achieve the high isolation in practice among a wide frequency band, a slotline-based 180° hybrid is proposed and studied, which features a high isolation between the sum and differential ports. For further verification, a demonstrator of a 1 × 4 array centered at 5.0 GHz is developed and fabricated. The measurements denote that the shared −10 dB impedance bandwidth of the two ports is from 4.75 to 5.18 GHz, and the interport 50 dB isolation bandwidth is from 4.55 to 5.66 GHz (over 21.7%).
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Low-Cost Electrical Beam-Scanning Leaky-Wave Antenna Based on Bent
           Corrugated Substrate Integrated Waveguide
    • Authors: Tian Lou;Xue-Xia Yang;Houtong Qiu;Qi Luo;Steven Gao;
      Pages: 353 - 357
      Abstract: This letter presents a novel low-cost leaky-wave antenna (LWA) with the fixed-frequency beam-scanning capability. An improved half-mode corrugated substrate integrated waveguide structure is proposed as the guiding wave structure to reduce the transverse size of the antenna. A novel electronic phase-shifting structure, composed of fan-shaped open stubs with different sizes and PIN diodes, is proposed for beam scanning. This LWA uses interdigital slots as radiating elements, and the phase-shifting structure is placed between the adjacent radiating elements. By changing the switching states of these PIN diodes, the phase difference between the adjacent radiating elements can be controlled. To verify the concept, one prototype of the 2 × 6 array antenna at C-band is designed, simulated, fabricated, and measured. The antenna demonstrates a beam-scanning range of 25° (34°–59°) at fixed frequency, a peak gain of 12.4 dBi with the gain variation less than 2.3 dB. The antenna has low cost and can be easily fabricated using standard printed circuit board process.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Phased Transmitarray Antennas for 1-D Beam Scanning
    • Authors: Peng-Yu Feng;Shi-Wei Qu;Shiwen Yang;
      Pages: 358 - 362
      Abstract: A transmitarray antenna (TAA) fed by a phased array antenna (PAA) for one-dimensional (1-D) beam scanning is proposed at 10 GHz in this letter. The TAA is composed of two types of elements, i.e., the hexagonal subwavelength low-pass elements as well as the pure dielectric ones. The PAA feed is a 1-D printed dipole array loaded with the short-circuited dummy ones. The proposed PAA-fed TAA, with a feeding-distance-to-TAA-diameter ratio (H/D) of mere 0.375, achieves a peak simulated gain of 25.6 dBi at 0° scanning (corresponding to peak aperture efficiency of 57.5%) and a 3.13 dB gain drop for ±30° beam scanning, along with a ∼2 dB beam crossover. The measured results agree reasonably well with the simulated ones, validating the proposed design.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Broadband Planar SIW Cavity-Backed Slot Antennas Aided by Unbalanced
           Shorting Vias
    • Authors: Qi Wu;Jiexi Yin;Chen Yu;Haiming Wang;Wei Hong;
      Pages: 363 - 367
      Abstract: Two types of substrate integrated waveguide (SIW) cavity-backed slot (CBS) antennas are proposed for bandwidth enhancement. First, a quad-resonance SIW CBS antenna is proposed using a cross-shaped slot and loading unbalanced shorting vias. Additional half-$textrm {TE}_{120}$ mode is successfully excited along with three other independent modes including half-$textrm {TE}_{110}$ and odd and even $textrm {TE}_{210}$ modes. Next, a penta-resonance SIW CBS antenna with a cross-shaped slot is proposed, in which two pairs of shorting vias are loaded. Two additional hybrid modes of half-$textrm {TE}_{210}$ and half-$textrm {TE}_{120}$ modes are introduced along with three other independent modes including half-$textrm {TE}_{110}$ and odd and even $textrm {TE}_{310}$ modes. Furthermore, the working mechanism of these two types of SIW CBS antennas is explained. Finally, prototypes of these two antennas are fabricated and measured at X-band. Their measured fractional bandwidths are $text{20.0}%$ and $text{20.8}%$, respectively. Simulation and measurement results agree very well, which confirms the validity of the proposed designs.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Biodegradable Dual Semicircular Patch Antenna Tile for Smart Floors
    • Authors: Hossein Fazeli Khalili;Sam Lemey;Olivier Caytan;Thomas Deckmyn;Sam Agneessens;Dries Vande Ginste;Hendrik Rogier;
      Pages: 368 - 372
      Abstract: A dual semicircular microstrip patch antenna implemented on a biodegradable substrate is presented for operation in the [863–873] MHz and [2.4–2.5] GHz frequency bands. To cover these frequency bands, two semicircular patches are compactly integrated onto a biodegradable cork tile, commonly found as support in laminate flooring, serving as a substrate. Thereby, the antenna tile may be seamlessly embedded as a sublayer of the floor structure. A higher-order mode is generated by applying via pins in the antenna topology to produce a conical radiation pattern with a null at broadside and sectoral coverage in the vertical plane. As such, the concealed floor antenna covers all azimuth angles of arrival in smart houses. The antenna performance is fully validated, also when the tile is covered by different polyvinyl chloride sheets. Owing to the supplementary design margins, the antenna impedance bandwidth remains covered. Moreover, the radiation patterns are measured in various elevation planes. Under stand-alone conditions, a radiation efficiency and a maximum gain of 74.3$%$ and 5.8 dBi at 2.45 GHz and 48.1$%$ and 2 dBi at 868 MHz are, respectively, obtained. Its omnidirectional coverage in the horizontal plane, stable performance on the inhomogeneous and biocompatible cork substrate and for various inhomogeneous superstrates, and its low-profile integration make the proposed antenna an excellent candidate for smart floors and smart houses.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Design of a Multilayer Broadband Switchable Absorber Based on
           Semiconductor Switch
    • Authors: Ning Hu;Jihong Zhang;Song Zha;Chenxi Liu;Hanqing Liu;Peiguo Liu;
      Pages: 373 - 377
      Abstract: A broadband switchable absorber from S-band to C-band is presented in this letter. The proposed structure is composed of three layers separated by air gap. From top to bottom, the layers of double split rings with lumped resistors, cut metal wires connected with p-i-n diodes and ground, are integrated to realize broadband absorption, switching feasibility, and independent polarization. For demonstration, the proposed absorber is investigated using a circuit analogy method, and the distributions of the surface current are also discussed in detail to analyze the mechanism of broadband absorption. Numerical calculations are carried out to investigate the specific performance and experiments are conducted to validate the design furthermore.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Ultrawideband Phased Antenna Arrays Based on Tightly Coupled Open Folded
    • Authors: Hangyu Zhang;Shiwen Yang;Shi-Wei Xiao;Yikai Chen;Shi-Wei Qu;Jun Hu;
      Pages: 378 - 382
      Abstract: Dielectric superstrates have been commonly utilized in tightly coupled dipole arrays (TCDAs) to help achieve better impedance matching over wide bandwidth and large scan volume. However, the dielectric slabs inevitably increase the total weight and fabrication complexity for TCDAs. Thus, an investigation of a new TCDA element excluding additional dielectric superstrates is proposed in this letter. Specifically, the tightly coupled elements in the proposed array are open folded dipoles, in which the gaps provide additional capacitance as compared to normal dipoles, thus resulting in better impedance matching. The proposed antenna array achieves 7.33:1 bandwidth (0.3–2.2 GHz) while scanning up to ±70° in the E-/D-plane and ±50° in the H-plane, subject to VSWR < 3.0. A prototype for an 8 × 8 array was fabricated and measured. Good agreement is achieved between measured and simulation results, thus validating the good performance of the proposed array.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Antenna Radiation Pattern Measurement in a Nonanechoic Chamber
    • Authors: Saulo M. Fróes;Pablo Corral;Marcela S. Novo;Miguel Aljaro;Antônio C. de C. Lima;
      Pages: 383 - 386
      Abstract: Several techniques are being studied with the objective of recovering the real antenna radiation patterns through measurements performed in nonanechoic environments. This is being proven by the use of digital signal processing techniques, based on several concepts, such as deconvolution, impulse response, and filtering. In this letter, a new methodology to obtain the actual antenna radiation patterns in noisy environments is proposed. An algorithm was developed that identifies similar points (power/angle) of the antenna radiation patterns through repeated measurements in different directions. Then, the most similar points were chosen, and the radiation pattern of the antenna was reconstructed and compared with the radiation pattern of the same antenna obtained in an anechoic chamber. The results demonstrate that the proposed technique is promising in the reconstruction of radiation pattern of antennas in noisy environments.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Radiation Pattern-Reconfigurable Leaky-Wave Antenna for Fixed-Frequency
           Beam Steering Based on Substrate-Integrated Waveguide
    • Authors: Yunjie Geng;Junhong Wang;Yujian Li;Zheng Li;Meie Chen;Zhan Zhang;
      Pages: 387 - 391
      Abstract: A novel reconfigurable leaky-wave antenna (LWA) with fixed-frequency beam-steering property is presented. The proposed antenna is designed on a substrate-integrated waveguide (SIW) whose effective width can be electronically changed. There are two rows of vias designed on each side of the SIW, and the vias in the outer rows are directly connected to the ground plane and top wall of the waveguide, but the vias in the inner rows are connected to the ground plane and top wall through p-i-n diodes that work as binary switches. By setting the states of the switches in a coding way, the effective width of the SIW can be changed numerically. Then, the propagation constant and the beam direction of the LWA can be altered accordingly. A prototype of the proposed antenna is fabricated and measured to verify the design procedures. The measured results show that the main beam direction can be steered from 46° to 68° in a step of 7° at the operating frequency of 5.2 GHz, which confirms the effectiveness and practicability of this design.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • A Single-Layer Differential Substrate-Integrated Slot Antenna With
           Common-Mode Rejection
    • Authors: Kai Sun;Yanwen Zhao;Deqiang Yang;Jin Pan;
      Pages: 392 - 396
      Abstract: A differentially driven substrate-integrated cavity-backed slot antenna, based on a single-layer substrate, is proposed in this letter. The radiation part of the antenna is a $2times 2$ element slot array that is fed by the higher order mode of a substrate-integrated cavity. The resonant mode is excited by a pair of symmetric coupling slots that are transformed from a grounded coplanar waveguide (GCPW) structure. In addition, the antenna bandwidth is enhanced by an additional resonant frequency, which is introduced by the feeding slots. In comparison to a conventional noncoplanar microstrip-slot coupling structure, the GCPW-slot coupling structure can be made coplanar, thereby effectively reducing the structural complexity of the antenna. In addition, the implementation of a balanced feeding scheme suggests that the radiation patterns of the proposed antenna are symmetric in both the E-plane and H-plane with low cross polarization. Moreover, under common excitation, the coupling slots cannot be effectively excited to conduct current, which indicates that the feeding structure has the characteristic of common-mode rejection.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • A Low-Profile and High-Gain CP Patch Antenna With Improved AR Bandwidth
           Via Perturbed Ring Resonator
    • Authors: Zhong-Xun Liu;Lei Zhu;Xiao Zhang;
      Pages: 397 - 401
      Abstract: A low-profile circularly polarized (CP) patch antenna with improved axial-ratio (AR) bandwidth and high gain is proposed in this letter. The antenna consists of a pin-loaded patch and a probe-fed ring resonator beneath the patch radiator. On the one hand, the radiative patch dominates the radiation, and the loading of shorting pins facilitates its high gain due to enlarged radiating area at resonance. On the other hand, the ring resonator with perturbation produces two additional split degenerate modes, which not only widen the bandwidth of magnitude, but also generate the required quadrature phase shift for CP radiation. The working mechanism is presented with an equivalent circuit model, allowing us to easily demonstrate how the ring resonator and patch radiator work together to effectively widen AR bandwidth. With the proposed method, stable high gain of about 11 dBic has been realized over an AR bandwidth of 6% for a single-fed CP patch antenna with profile of 0.05λ0 at 2.33 GHz.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • A Wideband Polarization-Reconfigurable Water Dielectric Resonator Antenna
    • Authors: Min Wang;Qing-Xin Chu;
      Pages: 402 - 406
      Abstract: A water dielectric resonator antenna with reconfiguration and broadband characteristics is presented. By injecting pure water into various cavities of the Plexiglass holder, the antenna can be switched among left-hand circular polarization, right-hand circular polarization, and linear polarization in almost the same operating frequency range. With the high relative permittivity, water acts as a dielectric resonator as well as an interface similar to electric wall to form a broad axial-ratio bandwidth. Thus, a broad usable bandwidth is measured to be over 22%, and the measured radiation efficiency and realized gain centralize in 60%–70% and 3–4 dBi, respectively.
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (2019)
  • Time-Modulated Phased Array Controlled With Nonideal Bipolar Squared
           Periodic Sequences
    • Authors: Roberto Maneiro-Catoira;Julio Brégains;José A. García-Naya;Luis Castedo;
      Pages: 407 - 411
      Abstract: Bipolar ($pm$ 1) sequences with no zero state suit particularly well for safeguarding the switched feeding network efficiency when applied to time-modulated arrays. During the zero state of a conventional time-modulating sequence, if a given array element is switched off, a certain amount of energy of the transmitted/received signal is wasted. We propose a novel single sideband time-modulated phased array (TMPA) architecture governed by realistic bipolar squared sequences in which the rise/fall time of the switches is considered. By using single-pole dual-throw switches and nonreconfigurable passive devices, the TMPA exploits, exclusively, the first positive harmonic pattern while exhibiting an excellent performance in terms of efficiency and control level of the undesired harmonics without using synthesis optimization algorithms (software simplicity).
      PubDate: Feb. 2019
      Issue No: Vol. 18, No. 2 (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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