【摘要】 为了使双层缝隙型频率选择表面在大角度入射时具有更小的传输损耗,利用带通滤波器的原理为双层FSS建立传输线等效模型,确定了层间的最佳距离。介质的不同加载方式及不同的介电常数都会对双层FSS的频率响应有较大影响,同时,两层传输曲线的耦合方式会影响频率响应曲线中心的传输损耗。仿真结果表明,在层间距离一定的情况下,介质厚度越薄,介电常数越小,频率响应曲线中心的传输损耗也越小。同时,增大通带带宽可以改善双层FSS在大角度入射时的通带中心凹陷程度。更多还原

【Abstract】 In order to reduce the transmission loss of frequency selective surface when the incident angle is large,a transmission line model has been built for the double-layer FSS using the principle of band pass filter.As a result,the optimum distance between layers is established.The different way of loading medium and different dielectric constant of double-layer FSS have great influence on the frequency response,at the same time,the coupling way of the two layer transmission curve can affect the transmission loss in the centre of the frequency response curve.The simulation results show that the transmi-ssion loss can be reduced as the thickness of medium is decreased and the dielectric constant is smaller with certain distance between layers.Meanwhile,the depression degree in the centre of the pass band with large incident angle can be improved by increasing transmission bandwidth.更多还原