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Applied Computational Electromagnetics Society journal
Applied Computational Electromagnetics Society, Inc.
Applied Computational Electromagnetics Society journal

Applied Computational Electromagnetics Society, Inc.

1054-4887

Applied Computational Electromagnetics Society journal/Journal Applied Computational Electromagnetics Society journalEISCIISTP
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    Fast Broadband Scattering Computation for Finite Periodic Arrays using the Characteristic Basis Function Method and the Best Uniform Rational Approximation

    Fang LiHai Rong ZhangLin ChenXing Wang...
    848-854页
    查看更多>>摘要：In this paper, a hybrid method combiningthe characteristic basis function method (CBFM) and thebest uniform rational approximation (BURA) techniquefor fast wideband radar cross-section (RCS) predictionof finite periodic arrays is proposed. The traditionalCBFM requires reconstructing the reduced matrix ateach frequency point, which is very time-consumingwhen calculating the wideband RCS of the target. Byintroducing the BURA technique, the hybrid method isproposed to efficiently calculate the wideband RCS. Thetarget is first divided into several easily solvable subdomains.Then, the surface integral equation is solved bythe characteristic function method to obtain the equivalentsurface current at the Chebyshev node. Afterwards,the surface current in a desired frequency band is representedby the Chebyshev series. To improve accuracy, theChebyshev series is matched with the Maehly approximation.After obtaining the current coefficients in thewhole bandwidth, the current density at any frequencypoint in the bandwidth can be calculated. Finally, thebroadband electromagnetic scattering characteristics ofthe finite periodic arrays can be obtained.
      原文链接:
    • NETL
    • NSTL
    • Applied Computational Electromagnetics Soc

    Improved Mid-field Phased Array Calibration Method Based on Complex Interpolated Signals

    Junhao ZhengZhengpengWangBinhui LiuHuaqiang Gao...
    855-860页
    查看更多>>摘要：In this brief paper, an improved method ofseparate amplitude and phase interpolations is presentedfor the mid-field phased array calibration system. Sincethe amplitude is relatively continuous and the phase suffersfrom phase wrapping, the proposed method useslinear and phase-unwrapping natural neighbor interpolationmethods to reconstruct the amplitude and phasematrices, respectively. When compared with the existingwork, the proposed method is more accurate under thecost-effective over-the-air testing environment.
      原文链接:
    • NETL
    • NSTL
    • Applied Computational Electromagnetics Soc

    A Focused Metasurface Lens Antenna with Gain Enhancement

    Yu DongXing Chen
    861-867页
    查看更多>>摘要：A specialized metasurface has been developedfor lens antenna applications. This innovative metasurfaceunit cell comprises five metallic layers and fourdielectric layers. Each metallic layer consists of a pairof back-to-back split resonant rings. The proposed unitcell is highly effective with a transmission phase coverageexceeding 360◦ and a transmission amplitude largerthan 70% at X-band (8.8-11.2 GHz). The unit cell hasbeen thoroughly designed, fabricated and tested. To verifythe present unit cell, a metasurface array with 27×27elements is designed. An X-band horn antenna is usedas the feed source. Simulation and measurement resultsshow that the electromagnetic wave from the feed hornis focused within the operating band, resulting in a measuredgain of 16.9 dB at 9 GHz and 19.2 dB at 11 GHz.Thus, a gain enhancement of 5.4 dB at 9 GHz and 5.7 dBat 11 GHz are obtained, making it a good reference forengineering applications.
      原文链接:
    • NETL
    • NSTL
    • Applied Computational Electromagnetics Soc

    A Low-profile Wideband Pattern Reconfigurable Antenna with Metasurface

    GuangRui LiuCheng JuZijie LiZhiqun Yang...
    868-875页
    查看更多>>摘要：This paper presents a pattern reconfigurableantenna with low-profile and wide bandwidth. Theantenna is composed of a patch layer, a metasurface(MS) layer, and a full ground plane. The radiation patchconsists of a microstrip-fed square and three parasiticpatches. The MS with 4×4 units is added on the topof the patch layer to improve bandwidth as well as tuneradiation pattern. Ten of the MS units are available toconnect with the ground plane, each of which is loadedwith a PIN diode to control the shorting state, providing12 beam states with reconfigurable beams between±5◦ to ±15◦ both in xoz and yoz planes. The proposedantenna has been fabricated and measured. Measurementshows that the antenna has a wide impedance bandwidthof 4.02-5.72 GHz, a beam scanning range of -16◦-15◦ inxoz plane and -13◦-15◦ in yoz plane, peak gain range of4.94-6 dBi. With a planar shape of low profile and fullground plane, the antenna design is a good candidate tobe applied in wireless communication systems with conductivesurface.
      原文链接:
    • NETL
    • NSTL
    • Applied Computational Electromagnetics Soc

    A High-Gain Vivaldi Antenna Loaded with Metasurface for Broadband Applications

    Kun LiZijie LiXiaorui LiuShandong Li...
    876-884页
    查看更多>>摘要：In this article, a Vivaldi antenna with broadbandwidth and high gain is proposed. The proposedantenna consists of a coplanar Vivaldi antenna (CVA)configuration etched with two rhombus slots at both sidesof the radiation arm to improve bandwidth and gainat the low frequencies as well as maintaining antennaminiaturization. A compact broadband metasurface isloaded in the dielectric region between the two exponentiallytapered lines to improve radiation performancein a wide frequency range without increasing antennasize. The antenna has been fabricated and measured,obtaining 1.27-9.4 GHz bandwidth covering L/S/C/Xand ultra-wideband (UWB) lower bands. The measuredgain ranges from 3 dBi to 9.67 dBi. With a miniaturizedsize of 100×100×1 mm~3, good directional radiation patternand high gain in the whole working band, the proposedantenna is a good candidate for the applications inmulti-band coverage systems.
      原文链接:
    • NETL
    • NSTL
    • Applied Computational Electromagnetics Soc

    Architecture and Validation of Wideband Simultaneous Transmit and Receive Phased Array System

    Jie ZhangHongchaoWuLianqing Yu
    885-890页
    查看更多>>摘要：Because signals of different frequenciesexhibit different characteristics after channel coupling,the traditional phased array system only uses phaseshifter or antenna beam control to process frames plusamplitude adjustment control, which has the problem ofoptimizing the parameters of different frequencies to offsetthe mismatch. Based on the principle of broadbandadaptive beamforming, each channel is configured as anadaptive filter with multiple taps to satisfy the preciserelationship between interference suppression and frequency.On this basis, combined with the simultaneousapplication of a multi-element array system, a multitapweight optimization method for interference suppressionis proposed. At the same time, in order to satisfythe application requirements of the existing phased arraysystem architecture with only one set of controllableand adjustable weights, an adaptive beamforming weightoptimization method for phased array system for widebandsignals is analyzed and proposed on the basis ofsimulation analysis and research on the electromagneticcharacteristics of the coupled self-interference channel.Through electromagnetic simulation evaluation and principletest verification, a set of weights corresponding tothe center frequency of the wideband signal can be usedto achieve interference suppression greater than 114 dBin the active transmission domain.
      原文链接:
    • NETL
    • NSTL
    • Applied Computational Electromagnetics Soc

    One-to-Multiple RF Power Transmission System Based on High-Gain Phased Array with Beam Control

    Xue BaiYanjiao HouLeijun XuJianfeng Chen...
    891-900页
    查看更多>>摘要：This paper proposes a one-to-multiple RFwireless power transmission (WPT) system that usesmulti-mode phased array technology to control beamforming.The proposed system uses array partition modeand time division mode to achieve multi-target WPT.A novel quasi-Yagi antenna with enhanced gain isdesigned, consisting of a pair of dipoles, three directors,and a single split-ring resonator (SSRR), which isthen used to form a 1×8 array for power transmission.The antenna has a bandwidth of 0.35 GHz with a frequencyrange of 2.25-2.6 GHz and a gain of 9.38 dBi.The total gain of the 1×8 array antenna is 17.23 dBi.An 8-way power divider is designed and implementedto feed the power amplifier (PA) of each array element,with isolation greater than 20 dB and return loss less than−17 dB. A digital phase and attenuation control circuitis also designed to achieve beam control. Measurementresults show that at a distance of 3 meters, the maximumreceived power for single-target and multi-targetschemes is 7.5 dBm and −2.6 dBm at each node, respectively.The system’s flexible beam control mode and highgain transmission characteristics can be used in scenariossuch as wirelessly powering Internet of Things (IoT)multi-sensor networks.
      原文链接:
    • NETL
    • NSTL
    • Applied Computational Electromagnetics Soc

    Dual-band Circularly-polarized Millimeter-wave Substrate Integrated Waveguide Slot Antenna Array with a Small Frequency Ratio

    Jianxing LiXiaoyan YuSifan WuSen Yan...
    901-907页
    查看更多>>摘要：In this paper, a 4×4 dual-band circularlypolarized(CP) substrate integrated waveguide (SIW)slot antenna array with a small frequency ratio (FR)is investigated in the Ka-band. The proposed antennaarray achieves the small FR by radiating two highordermodes, i.e. TM_(130) and TM_(230), with close resonantfrequencies. To realize CP performance, a sequentialrotated feeding (SRF) network is used to design a 2×2subarray. A 4×4 CP antenna array is further developedto enhance the directivity. Measured results show theantenna array achieves impedance bandwidth (|S_(11)| < -10 dB) of 27.35-27.96 GHz at the lower band and 29.62-30.58 GHz at the higher band with an FR of only 1.1. Themeasured 3-dB axial-ratio (AR) bandwidths are obtainedas 27.66-27.78 GHz and 30.34-30.45 GHz with righthandedcircularly-polarized (RHCP) peak gains of 16.9and 16.8 dBi, respectively. The proposed antenna arrayis a potential candidate for millimeter-wave communicationsystems.
      原文链接:
    • NETL
    • NSTL
    • Applied Computational Electromagnetics Soc

    Wideband Cup Dielectric Resonator Antenna With Stable Omnidirectional Patterns

    Shuxin ZhengNan YangXiaoming ChenZhen-Yuan Zhang...
    908-915页
    查看更多>>摘要：A wideband omnidirectional cup dielectricresonator antenna (CDRA) is designed by utilizing threemodes (DR TM_(01δ) , coil, and monopole modes) for thefirst time. It deploys the modified coil feeding structurecomprising four coil segments and two close-byprobes. The four coil segments provide an equivalentmagnetic-current loop and the two probes act as an electricmonopole. Thus, the modified feeding structure canexcite the DR TM_(01δ) mode and two neighbor resonancesextending the operating bandwidth. All of thesemodes have omnidirectional characteristics. To verify theidea, a CDRA is designed, fabricated, and measured.The CDRA is 0.61λ_0 ×0.32λ_0 (where λ_0 is the freespacewavelength at the center frequency) with a bandwidthof 67.7% (3.28-6.64 GHz). The antenna has stableomnidirectional radiation patterns, high radiation efficiencies,and a low cross-polarized level within the operatingbandwidth.
      原文链接:
    • NETL
    • NSTL
    • Applied Computational Electromagnetics Soc

    Wideband Wide-angle SSPP-fed Leaky-wave Antenna with Low Side-lobe Levels

    Yanzhen ShiZhibo FanCong ChenYongjin Zhou...
    916-926页
    查看更多>>摘要：In this paper, a broadband wide-angle leakywaveantenna (LWA) with low sidelobe levels (SLL)is proposed. The antenna is composed of two parts:a broadband wide-angle scanning spoof surface plasmonpolariton (SSPP)-fed circular patch antenna arrayand electromagnetic bandgap (EBG) structures tiled onboth sides of the antenna array. By controlling the couplingdistances between the circular radiation patchesand SSPP feeding line, the attenuation constant alongthe radiation aperture is specially designed in a taperedway to achieve low SLL. EBG structures are adopted toreduce the back-lobe levels. Measured results show thatthe scanning angle of the proposed antenna reaches 82◦.The measured realized gains are from 8 to 15.7 dBi inthe operating frequency range from 8 to 12 GHz, witha maximum SLL less than -15 dB. The wide-band wideangleSSPP-fed LWA with low SLL can find applicationsin radar detection and microwave imaging.
      原文链接:
    • NETL
    • NSTL
    • Applied Computational Electromagnetics Soc