基于椭圆孔阵列的频率选择表面研究

针对准光学馈电网络系统对频道分离性能的要求,研究了一种工作于毫米波、亚毫米波的无介质支持的双层金属椭圆孔阵列频率选择表面。其在反射通道中反射54GHz和89GHz 2个信号的电磁波。在透射通道中,对165GHz和183GHz 2个通道的信号是透明的。使用模式匹配法仿真分析并设计频率选择表面,结果表明:当入射角度为18°时,2个反射通道中双极化的插入损耗小于0.1dB,2个透射通道的双极化插入损耗不大于0.6dB,各项指标能满足频率选择表面在通道引入的插入损耗不大于0.8dB的要求。此外,通过蒙特卡罗法分析加工误差对频率选择表面性能的影响,根据指标要求给出加工精度的下限,为实际加工提供数据支持。

Research on Frequency Selective Surface with Elliptical Aperture Array

To meet the requirement of channel separation in quasi-optical feed network system, a double-layer frequency selective surface (FSS) with elliptical aperture array without support layer is designed for millimeter and sub-millimeter wave remote sensing, which is opaque around 54 GHz and 89 GHz in reflection channel and is transparent at 165 GHz and 183 GHz in transmission channel. The FSS is simulated and designed by mode matching method. The simulation results show that the insertion losses of both TE and TM polarizations in two reflection channels are less than 0.1 dB and those in two transmission channels are not more than 0.6 dB when the incident angle is 18 degrees. All simulation data meet the requirement that the insertion loss introduced to the influence of processing error on the channel is not more than 0.8 dB. In addition, the influence of processing error on the performance of FSS is analyzed by Monte Carlo method, and the error threshold is determined according to specifications, providing data support for actual fabrication.