<![CDATA[ IEEE Transactions on Antennas and Propagation - new TOC ]]>
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TOC Alert for Publication# 8 2016June 23<![CDATA[Table of Contents]]>646C12066283<![CDATA[IEEE Transactions on Antennas and Propagation]]>646C2C283<![CDATA[Compact Linearly and Circularly Polarized Unidirectional Dielectric Resonator Antennas]]> mode to obtain the required equivalent magnetic dipoles. The required electric dipoles are provided by the currents on the small ground planes. To demonstrate the idea, both LP and CP unidirectional DRAs operating at 2.4 GHz were designed, fabricated, and tested. Reasonable agreement between the measured and simulated results is observed. It was found that the front-to-back ratio (FTBR) of the LP design is more than 15 dB over the frequency range 2.30–2.55 GHz (10.1% bandwidth). For the CP design, the FTBR is over 15 dB across the frequency range 2.40–2.55 GHz (6.1% bandwidth).]]>646206720741825<![CDATA[X-Band Choke Ring Horn Telecom Antenna for Interference Mitigation on NASA’s SWOT Mission]]>646207520822100<![CDATA[CubeSat Deployable Ka-Band Mesh Reflector Antenna Development for Earth Science Missions]]>3) stowage volume suitable for 6 U (10 × 20 × 30 cm^{3}) class CubeSats. Considering all aspects of the deployable mesh reflector antenna including the feed, detailed simulations and measurements show that 42.6-dBi gain and 52% aperture efficiency is achievable at 35.75 GHz. The mechanical deployment mechanism and associated challenges are also described, as they are critical components of a deployable CubeSat antenna. Both solid and mesh prototype antennas have been developed and measurement results show excellent agreement with simulations.]]>646208320932135<![CDATA[Spoof Plasmon-Based Slow-Wave Excitation of Dielectric Resonator Antennas]]>01δ mode such as lower thickness-dependency of the resonant frequencies, superb miniaturization and ultra-compactness, and omnidirectional radiation for horizontally polarized waves. We anticipate that the ground-free SP-based feeding technique could be applied to effectively excite the more “unusual” modes of the isolated DRAs.]]>646209420991777<![CDATA[Design of Compact Air-Vias-Perforated SIW Horn Antenna With Partially Detached Broad Walls]]>646210021071940<![CDATA[A Planar Quasi-Magnetic–Electric Circularly Polarized Antenna]]>646210821141444<![CDATA[A High-Gain Single-Feed Dual-Mode Microstrip Disc Radiator]]> and modes. The patches are designed, so that the resonant frequencies for both modes converge into a single frequency. It is found that by simultaneous excitation of both resonant modes, high gain and low sidelobe level (SLL) can be obtained in the radiation patterns. Excitation is done using a single coaxial feed. The fundamental working principle of the antenna is based on the superposition of radiated far fields of the and modes. At first, through a pattern synthesis, using different far field mode amplitude ratios, it is shown that the substrate dielectric constants can be selected for both layers such that it leads to low SLL. Next, for practical antenna design, the mode excitation, input impedance, and radiation properties of the mode are studied. For sound understanding and explanation, the edge voltage ratio at the aperture and mode amplitude ratio in the far field are calculated and their effects on SLL and peak directivity are discussed. Finally, the measurements results are provided in support of simulations.]]>646211521265208<![CDATA[Wearable Shell Antenna for 2.4 GHz Hearing Instruments]]>646212721352507<![CDATA[On the Design of Vehicular Electrically Small Antennas for NVIS Communications]]>646213621453200<![CDATA[Fixed-Frequency Beam Steering of Microstrip Leaky-Wave Antennas Using Binary Switches]]>646214621543303<![CDATA[Leaky-Wave Antennas Based on Noncutoff Substrate Integrated Waveguide Supporting Beam Scanning From Backward to Forward]]>646215521643646<![CDATA[Performance Enhancement of a Dual-Band Monopole Antenna by Using a Frequency-Selective Surface-Based Corner Reflector]]>646216521712671<![CDATA[High-Gain Circularly Polarized Microstrip Patch Antenna With Loading of Shorting Pins]]>646217221782018<![CDATA[Low-Redundancy Large Linear Arrays Synthesis for Aperture Synthesis Radiometers Using Particle Swarm Optimization]]>646217921881073<![CDATA[Near-Optimal Shaped-Beam Synthesis of Real and Coupled Antenna Arrays via 3-D-FEM and Phase Retrieval]]>64621892196865<![CDATA[FSS-Inspired Transmitarray for Two-Dimensional Antenna Beamsteering]]>646219722063543<![CDATA[On the Bandwidth Gap Between the Array-Feed and Cluster-Feed Regimes for Broadband Multifeed Systems]]>646220722161297<![CDATA[Multiband High-Order Bandstop 3-D Frequency-Selective Structures]]>646221722266218<![CDATA[Fast Antenna Array Diagnosis from a Small Number of Far-Field Measurements]]>a priori knowledge of the failure-free array radiation pattern, it is possible to reformulate the diagnosis problem such as only the faulty elements or the localized field differences have to be retrieved. Efficient and readily available sparse recovery algorithms can then be applied to identify the failures from a small number of measurements compared to standard diagnosis techniques and hence speed up the diagnosis. More specifically, three regularization procedures namely the minimization of the , total variation (TV), and the mixed norm are used to solve the ill-posed array diagnosis problems. These approaches are compared to two standard fault identification techniques: the back-propagation algorithm (BPA) and the matrix inversion method for the diagnosis from simulated and measured data. The simulation of a waveguide array in realistic conditions of noise and taking into account the potential scaling factor between two measurements is first presented. Then, a reflectarray composed of 193 cells with metallic strips to emulate phase failures is considered. Both numerical and experimental results confirm the effectiveness of the sparse recovery algorithms and the importance of prior information on the source.]]>646222722356933<![CDATA[Performance of the Large-Scale Adaptive Array Antennas in the Presence of Mutual Coupling]]>64622362245620<![CDATA[A 1-Bit <inline-formula><tex-math notation="LaTeX">$10 times 10$</tex-math></inline-formula> Reconfigurable Reflectarray Antenna: Design, Optimization, and Experiment]]> elements is presented with a detailed design procedure for an improved beam-scanning performance. The element, designed at Ku band using a simple patch structure with one PIN diode and two substrate layers, can be electronically controlled to generate two states with 180° phase difference and low reflection loss. A reflectarray prototype is fabricated and experimentally studied for proof of principle. The limitations of the small aperture size are analyzed in detail, and synthetic optimizations of both feed location and aperture phase distribution are used to improve the beam-scanning performance of the prototype. Experimental results agree well with the full-wave simulations, and scan beams within range are obtained with a maximum aperture efficiency of 17.9% at 12.5 GHz. Consistent scan beams are obtained from 11.75 to 13.25 GHz. Furthermore, the versatile beam-forming capability of the RRA is also demonstrated by a wide-beam pattern synthesis. A fast beam-switching time () is theoretically analyzed and verified by the measurement.]]>646224622542247<![CDATA[Dual Circularly Polarized Equilateral Triangular Patch Array]]> and fed by separated feed networks. Since LP antenna elements are used, the design of the feed network is much simplified. Through sequentially varying the feeding phase by , dual circular polarizations are obtained. The operation principle of the array antenna is also analytically explained in this paper. To verify the design concept, one dual LP equilateral triangular patch and one dual CP equilateral triangular patch array resonating at 10.5 GHz are designed, fabricated, and tested. There is a good agreement between the simulation and measurement results, both of which show that the array antenna exhibits high port isolation and good circular polarizations with low cross polarization at different planes. The proposed design technique can be applied to the design of dual CP array antennas operating at other frequency bands.]]>646225522622382<![CDATA[Simple Formula for Aperture Efficiency Reduction Due to Grating Lobes in Planar Phased Arrays]]>64622632269958<![CDATA[Radiating Elements for Shared Aperture Tx/Rx Phased Arrays at K/Ka Band]]>646227022824156<![CDATA[A General Theory to Determine the Exact Radiated Power, Directivity, and Radiation Resistance of a Line-Source Radiator]]>64622832292646<![CDATA[<inline-formula> <img src="/images/tex/598.gif" alt="L_{2}"> </inline-formula>-Regularized Iterative Weighted Algorithm for Inverse Scattering]]>2-regularized iterative weighted algorithm (L_{2}-IWA). The L_{2}-regularizer has been introduced to stabilize the algorithm against nonlinear approximations, and the sparsity is enforced with the aid of another reweighted L_{2}-norm regularizer to address the ill-posedness of the inverse problem. The derived algorithm is a three-step iterative technique which solves the underdetermined set of equations at each DBIM iteration. Moreover, the convergence of the L_{2}-IWA technique is proved, analytically. The suggested method outperforms its other counterparts in various scenarios of homogeneous and heterogeneous breast models. Besides improving the resolution of the breast tumors, the L_{2}-IWA technique is shown to be robust against additive noise.]]>646229323001288<![CDATA[Polarizability Tensor Retrieval for Subwavelength Particles of Arbitrary Shape]]>646230123102315<![CDATA[Analysis and Design of Bessel Beam Launchers: Longitudinal Polarization]]>finite inward cylindrical traveling wave aperture field distribution. The launcher radiates an electric field whose normal or longitudinal component takes the form of a zeroth-order Bessel function. The nondiffractive behavior of the structure in a well-defined area close to the radiating aperture is analyzed by decomposing the radiated field in its geometrical optics (GO) and diffractive (D) contributions. A closed-form expression is provided for the GO contribution whereas an asymptotic approximation is provided for the diffractive part. Such theoretical analysis allows a precise definition of the nondiffractive region for the generated Bessel beam. At the same time, it also highlights and predicts the oscillating behavior of the longitudinal component of the electric field along the z-axis due to the diffraction from the edges of the aperture. The proposed analysis is validated by a prototype at 30 GHz made by a radial waveguide loaded with metallic gratings and centrally fed by a coaxial probe. Measurement results for the longitudinal component of the electric field are in excellent agreement with full-wave results. In addition, the nondiffractive behavior for the radiated beam is reported over a bandwidth larger than 6.5% around 30 GHz. This behavior is peculiar of the nonresonant first kind Hankel aperture field distribution used for the generation of the Bessel beam.]]>646231123182913<![CDATA[A Closed-Form Representation of Isofrequency Dispersion Curve and Group Velocity for Surface Waves Supported by Anisotropic and Spatially Dispersive Metasurfaces]]>646231923272763<![CDATA[Millimeter Wave Imaging Architecture for On-The-Move Whole Body Imaging]]>646232823384583<![CDATA[An Enhanced Augmented Electric-Field Integral Equation Formulation for Dielectric Objects]]>646233923471321<![CDATA[Conforming Testing of Electromagnetic Surface-Integral Equations for Penetrable Objects]]>646234823571221<![CDATA[Transient Analysis of Lumped Circuit Networks-Loaded Thin Wires By DGTD Method]]>646235823692509<![CDATA[Long-Time Instability Analysis of Pseudospectral Time-Domain Method]]>646237023771276<![CDATA[Parallel PWTD-Accelerated Explicit Solution of the Time-Domain Electric Field Volume Integral Equation]]>8 log N_{8}) and O(N_{8}N_{t}), respectively. Here, N_{8} is the number of spatial basis functions and N_{t} is the number of time steps. A scalable parallelization of the proposed MOT scheme on distributed-memory CPU clusters is described. The efficiency, accuracy, and applicability of the resulting (parallelized) PWTD-PC-EFVIE solver are demonstrated via its application to the analysis of transient electromagnetic wave interactions on canonical and real-life scatterers represented with up to 25 million spatial discretization elements.]]>646237823881922<![CDATA[Computation of Galerkin Double Surface Integrals in the 3-D Boundary Element Method]]>64623892400704<![CDATA[A Numerical Study of Debye and Conductive Dispersion in High-Dielectric Materials Using a General ADE-FDTD Algorithm]]>646240124092034<![CDATA[A Discontinuous Galerkin Time-Domain Integral Equation Method for Electromagnetic Scattering From PEC Objects]]>646241024171584<![CDATA[Deterministic Reduced-Order Macromodels for Computing the Broadband Radiation-Field Pattern of Antenna Arrays in FDTD]]>646241824301790<![CDATA[Extension and Optimization of the Axisymmetric 2.5-D Eigensolver: Toward Far-Field Calculations in Stratified Backgrounds]]>646243124441623<![CDATA[A Novel Broadband Multilevel Fast Multipole Algorithm With Incomplete-Leaf Tree Structures for Multiscale Electromagnetic Problems]]>646244524563114<![CDATA[Emissive Properties of Wearable Wireless-Communicating Textiles Made From Multimaterial Fibers]]>11), radiation pattern, efficiency (gain), and bit-error rate (BER) adequately address short-range wireless communications applications at Mbps data-rate scales. The wireless-communicating textiles were fabricated by integrating polymer-glass-metal fiber composites into textile hosts using conventional weaving process. This multimaterial fiber approach provided good radio-frequency (RF) emissive properties in compliance with safety regulations while preserving the mechanical and cosmetic properties of the garments. These results demonstrate that multimaterial fiber textiles could be designed for short-range wireless network applications addressing the IEEE 802.11b/g/n and IEEE 802.15.4 standards at 2.4 GHz frequency.]]>646245724642541<![CDATA[On the Clustering of Radio Channel Impulse Responses Using Sparsity-Based Methods]]> minimization. Then, a heuristic approach is provided to identify clusters in the recovered CIRs, which leads to improved clustering accuracy in comparison to identifying clusters directly in the raw CIRs. Finally, a clustering enhancement approach, which employs the goodness-of-fit (GoS) test to evaluate clustering accuracy, is used to further improve the performance. The proposed algorithm incorporates the anticipated behaviors of clusters into the clustering framework and enables applications with no prior knowledge of the clusters, such as number and initial locations of clusters. Measurements validate the proposed algorithm, and comparisons with other algorithms show that the proposed algorithm has the best performance and a fairly low computational complexity.]]>646246524741042<![CDATA[Semi-Deterministic Radio Channel Modeling Based on Graph Theory and Ray-Tracing]]>646247524862043<![CDATA[Improving the Accuracy in Predicting Water-Vapor Attenuation at Millimeter-Wave for Earth-Space Applications]]>V on the reference site altitude, which is investigated by taking advantage of an extensive set of radiosonde observations (RAOBS) collected in several sites worldwide and characterized by high accuracy and reliability. Tested against attenuation estimates obtained from the mass absorption models coupled with the mentioned RAOBS data, the model's prediction accuracy turns out to improve significantly with respect to the current recommendation and to be less dependent both on the operational frequency (20-100 GHz range) and on the considered site.]]>646248724931256<![CDATA[Near-Ground Channel Modeling for Distributed Cooperative Communications]]>646249425022389<![CDATA[Asymmetric Geometry of Defected Ground Structure for Rectangular Microstrip: A New Approach to Reduce its Cross-Polarized Fields]]>646250325061757<![CDATA[Stochastic Analysis of the Impact of Substrate Compression on the Performance of Textile Antennas]]>64625072512864<![CDATA[Microstrip Phased-Array In-Band RCS Reduction With a Random Element Rotation Technique]]> circularly polarized (CP) microstrip arrays, 1) the uniform array without rotation; 2) sequentially rotated (SR) array; and 3) RR array, are compared and analyzed. Results indicate that the RCS of the RR array can be reduced significantly, even in the main beam region, while maintaining its high radiation performance.]]>646251325182923<![CDATA[Compact Corrugated Feedhorns With High Gaussian Coupling Efficiency and <inline-formula><tex-math notation="LaTeX">$-60;text{dB}$</tex-math></inline-formula> Sidelobes]]> , , and modes near the throat of the horn while limiting excitation of higher order modes. We present the design and measurement of two families of dual-profiled horn, both with a directivity of 20 dBi that couple with very high efficiency to a fundamental Gaussian mode. The first was optimized for sidelobe performance and features sidelobes approaching 60 dB for a horn length of only 15.6. The second was designed to minimize horn length and to achieve sidelobe levels below for a horn that is only 4.8 long. The horns exhibit excellent coupling to the fundamental free-space Gaussian mode, with power coupling of 99.92% and 99.75%, respectively. We demonstrate excellent agreement between simulation and experiment at 94 GHz and simulate the performance over a 20% bandwidth. High-performance compact scalar horns are of interest because they reduce manufacturing risk at high frequencies, and reduce size and weight at lower frequencies, which can be important in horn arrays and space applications, where horn arrays often have serious weight and size restrictions.]]>64625182522436<![CDATA[Fast Parametric Modeling of Radio Astronomy Reflector Antenna Noise Temperature]]>64625222526733<![CDATA[Adaptive Broadband Radar Absorber Based on Tunable Graphene]]> in the frequency range from 7 to 22 GHz, is proposed. The new absorber is a two-period dielectric Salisbury, in which the outer lossy sheet is made of a graphene monolayer, and the inner one consists of a tunable graphene/dielectric laminate (GL). The two dielectric spacers are made of a commercial low-loss polymer. The total thickness is . The adaptive broadband response of the absorber is achieved tuning the effective sheet resistance of the GL through an applied electrostatic field bias. The sensitivity analysis of the reflection coefficient of the absorber illuminated by a plane wave with normal incidence is carried out with respect to the spacer thickness and the graphene carrier charge mobility. By applying a dc-voltage source always below 15 V, the minimum reflection coefficient of the adaptive absorber is centered around 14 GHz, and it is characterized by a bandwidth at of .]]>64625272531475<![CDATA[Compact Microstrip Patch Array Antenna With Parasitically Coupled Feed]]>646253125341481<![CDATA[Design of a Circularly Polarized Ground Radiation Antenna for Biomedical Applications]]>646253525403022<![CDATA[A Wideband Dual-Mode SIW Cavity-Backed Triangular-Complimentary-Split-Ring-Slot (TCSRS) Antenna]]>646254125452374<![CDATA[An Effective MoM Solution With Nested Complex Source Beam Method for Electromagnetic Scattering Problems]]>64625462551719<![CDATA[Rapid Multiobjective Antenna Design Using Point-By-Point Pareto Set Identification and Local Surrogate Models]]>646255125561347<![CDATA[Fourier-Based Imaging for Subsampled Multistatic Arrays]]>646255725622534<![CDATA[Low-Profile Wideband Monopolar UHF Antennas for Integration Onto Vehicles and Helmets]]>646256225682620<![CDATA[High-Efficiency Stacked Shorted Annular Patch Antenna Feed for Ku-Band Satellite Communications]]>646256825721293<![CDATA[Microfluidically Reconfigured Wideband Frequency-Tunable Liquid-Metal Monopole Antenna]]>646257225761737<![CDATA[Dual-Surface Electric Field Integral Equation Solution of Large Complex Problems]]>646257725821648<![CDATA[Comments on “Theoretical Modeling of a Photoconductive Antenna in a Terahertz Pulsed System”]]>64625832584345<![CDATA[Reply to “Comments on ‘Theoretical Modeling of a Photoconductive Antenna in a Terahertz Pulsed System’”]]>64625852585151<![CDATA[Corrections to “Development of Low-Profile Patch and Semi-Circular SIW Cavity Hybrid Antennas” [Sep 14 4481-4488]]]>6462586258628<![CDATA[Correction to “Analytical Evaluation of Retarded-Time Potentials for SWG Bases” [Sep 14 4860-4863]]]>64625872587279<![CDATA[Special issue on antennas and propagation aspects of 5G communications]]>6462588258865<![CDATA[IEEE Transactions on Antennas and Propagation]]>646C3C386<![CDATA[Institutional Listings]]>646C4C4313