基于超材料技术的吸波型频选结构设计

提出了一种复合型吸波频率选择表面（absorptive frequency selective surface, AFSS）结构，由超材料吸波体（metamaterial absorber , MA）和频率选择表面（frequency selective surface , FSS）组成. 复合型MA由加载电阻的平面型方环结构和立体型双面开口C型环结构组成，吸波频段为4.79～30.57 GHz，具有极化不敏感特性，在斜入射45°内保持稳定吸波. FSS采用了圆环缝隙旋绕结构，通过6次旋绕枝节实现了1.96～2.16 GHz频段内小于1 dB的插入损耗，形成低频通带. 二者组合形成的复合型AFSS，能在1.28～1.38 GHz频段内良好透波，4.88～30.58 GHz频段内宽带吸波，实现了吸透波一体的性能. 

Absorptive Frequency Selective Surface Design Based on Metamaterial Technology

A composite absorptive frequency selective surface (AFSS) structure was proposed, being composed of metamaterial absorber (MA) and frequency selective surface (FSS). The composite MA was designed with a composite of a planar square ring structure loaded with resistors and a three-dimensional double-sided open C-ring structure, providing an absorption frequency band from 4.79 to 30.57 GHz, presenting polarization insensitive characteristics and stable absorption within 45° oblique incidence. The FSS was designed with a ring-shaped slot spiral structure, achieving an insertion loss less than 1 dB from 1.96 to 2.16 GHz frequency band through six spiral winding branches, forming a low-frequency passband. The composite AFSS formed by the combination of the two can achieve better wave penetration in the 1.28 to 1.38 GHz frequency band and broadband wave absorption in the 4.88 to 30.58 GHz frequency band, achieving the integrated wave absorption performance.