一种性能稳定的新单元频率选择表面

通过对十字孔径单元的四个端点添加L形的孔径，给出了一种新单元的频率选择表面(FSS)设计，同时通过拆分，得到了相对应的拆分单元FSS.利用谱域法，对两种FSS结构从理论上进行了分析，在TE波入射时角度变化、大角度入射时极化变化对中心频率的影响以及通带带宽三个方面进行了研究，并采用镀膜和光刻技术制备了两种FSS结构的实验样件，在微波暗室中进行测试，得到的实验曲线与理论仿真曲线基本一致.结果表明：新单元的两种FSS结构的中心频率均能在TE波入射时实现角度稳定性和大角度入射时实现极化稳定性；拆分单元FSS的中心 关键词： 频率选择表面(FSS) 新单元 极化稳定性 角度稳定性

A novel element of frequency selective surface with stable performance

Frequency selective surface (FSS) composed of a novel element is presented in this paper. The novel element is designed by adding L-shaped slots to the cross aperture at its four ends. By disconnecting the novel element，a corresponding disconnected element FSS is designed. Based on the spectral-domain approach，two FSS structures with the novel element are calculated and analyzed theoretically. The influence on the center frequency for changing angles of TE incidence，polarization of large angle incident waves and the pass band width in the operating frequency band are researched. With filming technology and lithography，two FSS samples are made. The tests are made in the microwave darkroom. The measured curve shows good agreement with the calculated curve. It is shown that the resonant frequency of both FSS structures are angle independent for TE incident waves or polarization independent for large angle incidence. Meanwhile，our disconnected element FSS structure has wider pass band with little change of the resonance frequency.