基于阵中单元模型的反射阵列天线远场分析方法
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摘要
针对反射阵列天线远场分析的传统技术采用周期模型等效实际阵列环境的不足,提出一种基于阵中单元模型的远场分析方法。该方法以场叠加原理和等效原理为基础,借助电场积分方程从局域子阵单元上的表面电/磁流计算出单元的阵中方向图,再进行总场合成。数值实验显示,利用该方法得到的反射阵列天线的远场方向图与商用软件FEKO的全结构仿真结果之间有良好的吻合度。该方法为突破大型平面/共形阵列天线的计算受限于计算机硬件的难题提供了一种解决方案。
The periodic model is generally used for analyzing the far field of reflectarrays.However,such model differs from the realistic array configuration that the reflectarray is composed of different size elements.Considering the faults of conventional method,this paper brings forward a new far field pattern analysis approach by the name of 'element-in-array model'.Based on the superposition principle and the equivalence principle,element-in-array pattern can be calculated from the equivalent surface electric/magnetic currents by electric field integral equation.Numerical results validate its accuracy and effectiveness.The new approach provides a feasible solution for analyzing large-scale planar/conformal array antennas.
The periodic model is generally used for analyzing the far field of reflectarrays.However,such model differs from the realistic array configuration that the reflectarray is composed of different size elements.Considering the faults of conventional method,this paper brings forward a new far field pattern analysis approach by the name of 'element-in-array model'.Based on the superposition principle and the equivalence principle,element-in-array pattern can be calculated from the equivalent surface electric/magnetic currents by electric field integral equation.Numerical results validate its accuracy and effectiveness.The new approach provides a feasible solution for analyzing large-scale planar/conformal array antennas.
引文
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[2]HAN C,HUANG J,CHANG K.A high efficiency offset-fedX/Ka-dual-band reflectarray using thin membranes[J].IEEETrans Antenna and Propagation,2005,53(2):2792-2798.
[3]ARREBOLA M,ENCINAR J A,BARBA M.Multifedprinted reflectarray with three simultaneous shaped beamsfor LMDS central station antenna[J].IEEE Trans Antennaand Propagation,2008,56(6):1518-1527.
[4]ZORNOZA J A,ENCINAR J A.Efficient phase-onlysynthesis of contoured beam patterns for very largereflectarrays[J].Int J RF and Microw Computer-AidedEngin,2004,54(5):415-423.
[5]VILLEGAS F J,RAHMAT-SAMII Y,JACKSON D R.Scattering characteristics of finite arrays of cylindricalcavities in an infinite ground plane[J].IEEE Trans AntennasPropagation,2003,51(9):2381-2392.
[6]VILLEGAS F J,RAHMAT-SAMII Y,JACKSON D R.Thecharacteristics of scattering from finite arrays ofnon-uniform cylindrical cavities in a ground plane[C]//2001IEEE Antennas and Propagation Society InternationalSymposium Digest.Boston,USA:IEEE,2001.
[7]MILON M A,CADORE D T,GILLARD R,et al.‘Surrounded-element’approach for the simulation ofreflectarray radiating cells[J].IET Microw Antennas Propag,2007,1(2):289-293.
[8]SARKAR T K,ARVAS E.An integral equation approach toanalysis of finite microstrip antennas:volume/surfaceformulation[J].IEEE Trans Antenna and Propagation,1990,38(3):305-311.
[9]SARKAR T K,RAO S M,DJORDJEVIC A R.Electromagnetic scattering and radiation from finitemicrostrip structures[J].IEEE Trans Microwave TheoryTech,1990,38(11):1568-1575.
[10]LI H,WANG B Z,DU P.Novel broadband reflectarrayantenna with windmill-shaped elements for millimeter-wave application[J].Int J Infrared Millimeter Waves,2007,28(3):339-344.
[11]KELKAR A.FLAPS:Conformal phased reflectingsurfaces[C]//Proceedings of the IEEE National RadarConference.Los Angeles,USA:IEEE,1991.