基于互补屏的主动频率选择表面设计研究

将谐振型频率选择表面负载阻抗分离可形成基于耦合机制的互补频率选择表面(CFSS). 控制容性表面单元的旋转角α, 可调节CFSS谐振频点. 以“Y”形单元为例, 利用耦合积分方程法计算了CFSS的频响特性, 并通过自由空间法测试250 mm×250 mm样件. 计算与测试结果表明: 随着 α角变化, CFSS能够实现主动变频功能, 为主动FSS设计提供借鉴. 关键词： 频率选择表面 主动频率选择表面 互补屏 耦合积分方程

Design and study of the active frequency selective surface based on the complementary screen*

Separating the load impedance of the resonant frequency selective surface (FSS) can form the complementary frequency selective surface (CFSS), whose filtering feature is based on the coupling mechanism. The resonance of CFSS can be tuned by controlling the rotation angle α of the element on the capacitive surface. Taking tripole element for example, the frequency response of the CFSS is calculated by using the coupled integral equation method. A 250 mm×250 mm prototype is tested via free space method. Calculation and test results show that the resonance of the CFSS can be tuned actively as the rotation angle α changes. This study provides reference to the active FSS design.
Keywords： frequency selective surface active frequency selective surface complementary screens the coupled integral equation method