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厚屏频率选择表面(FSS)能克服双层或多层溥屏FSS级联引起的结构复杂和中心频率透过率容易降低的不利影响,并且在拓展FSS带宽方面具有优势,这使其在曲面隐身雷达天线罩应用方面有潜在的价值.但是,当电磁波以大范围角度入射时,中心频率可能会随入射角度的变化而漂移,而且在大角度入射时不易实现极化稳定性.本文针对此问题,设计了一种新Y形单元厚屏FSS,利用模式匹配法对此结构进行分析计算,并研究TE,TM波入射时角度变化及大角度入射时极化变化对通带带宽、中心频率及其透过率的影响.仿真实验结果表明:新Y形单元厚屏FSS的中心频率在TE,TM波入射时均能实现角度稳定性和大角度入射时的极化稳定性.这为FSS在曲面隐身雷达天线罩上的应用提供了一种借鉴.
Thick-screen frequency-selective surfaces (FSS) overcomes the structurally complex and easily degraded center-frequency transmittance caused by double or multiple cascaded FSS cascades and has the advantage of expanding FSS bandwidth, However, when the electromagnetic wave is incident on a wide range of angles, the center frequency may drift with the incident angle, and it is not easy to realize the polarization stability when the incident angle is large .In this paper, Problem, a new thick Y-shaped cell FSS was designed and its structure was analyzed and calculated by using the pattern matching method. The effects of polarization changes at the entrance of the TE and TM waves on the passband bandwidth, center frequency And its transmissivity.The simulation results show that the central frequency of the new Y-shaped thick-walled FSS can achieve both angular stability and polarization stability at high angle of incidence when both TE and TM waves are incident, The application of surface concealed radar radome provides a reference.