阐述了平面波在无限平面单层频率选择表面(FSS)中的带内损耗机理并区分出失配损耗和介质损耗,基于模态分析法研究了诸多因素对损耗特性的影响。研究表明,介质有耗时,TE波大入射角下损耗最大;阵列分布或单元缝隙影响带宽的条件下,介质损耗与带宽总是呈相反的趋势;单侧介质加载的带内传输损耗主要是失配损耗还是介质损耗取决于介质厚度和加载方式。介质厚度为λ/4时失配损耗最大,λ/2时介质损耗最大;而且相同厚度下介质覆盖比衬底时的失配损耗小。对称加载时则主要为介质损耗,且损耗低于单侧加载。

The essence of in-band transmission loss of plane wave in the Frequency Selective Surface(FSS) with an infinite planar single layer was illustrated by distinguishing the mismatch loss and the dielectric loss.The effects of some parameters on loss characteristics were studied based on a modal analysis approach.Research results show that the dielectric loss is higher when FSS is illuminated with TE polarization in a large incidence angle.While array parameters and aperture widths affect the bandwidth,the dielectric loss always shows the reverse tendency with the bandwidth.The in-band transmission loss of one side dielectric loading is induced mainly by a mismatch loss or by a dielectric loss that depend on the dielectric thickness and the way of dielectric loading.When the dielectric thickness is 1/4 of wavelength,the mismatch loss reaches its maximum;when the dielectric thickness is 1/2 of wavelength,the dielectric loss reaches its maximum.Moreover,with the same dielectric thickness,the mismatch loss of the FSS with dielectric superstratum is less than that of the FSS with a substrate.The loss of both-side symmetric loading is from dielectric loss,which is lower than that of one-side loading.