排列方式对Y形单元厚屏频率选择表面传输特性的影响

Influence of Arrangement on Y-unit Thick Screen Frequency Selective Surface Characteristic

厚屏频率选择表面(TFSS)是在薄屏FSS基础上,通过增加金属屏厚度,构成一种波导单元传输模式的新型FSS,使其具有更好的中心频点稳定性和工作带宽特性。本文通过设计一种Y型单元的TFSS结构,并利用矩量法,研究了单元排列方式对其传输特性的影响。结果表明:TFSS的工作带宽较薄屏FSS的工作带宽大,且随着单元排布紧密程度上升;随着单元排布紧密程度上升,透过率和带宽都呈上升趋势;电磁波正入射较斜入射的工作带宽大,透过率随着单元排布紧密程度上升,而趋于稳定;随着金属屏厚度的增加,透过率和工作带宽都呈减小趋势。

Thick-screen FSS is proposed, based on thin-screen FSS, it is a new type structure, unlike thin-screen FSS. Because metallic screen thickness thickened, this is equivalent to add many waveguides on thin-screen FSS. To make it a better center frequency stability and bandwidth characteristics. This paper provides a novel Y element thick FSS, and analyzed the Method of moments structure. The unit arrangement influence of transmission characteristics. The results shown： TFSS bandwidth and with the unit configuration close degree rise transmittance and bandwidth are rising, along with the unit configuration close degree rise. Electromagnetic wave normal incidence is wider than the oblique incidence of the bandwidth, transmittance is rising with the tightness of the unit arrangement, and tend to be stable. With the increase of the thickness of the metal screen, through rate and bandwidth are shown a trend of decrease.