亚毫米波段波导阵列结构频率选择性滤波器的设计

内容简介：在毫米波和亚毫米波段探测技术中，为了满足低的透射带插入损耗及反射带反射损耗的需要，本文设计了一种基于波导阵列结构的频率选择性滤波器，通过结构参数的优化设计，克服了大角度入射下透射带插入损耗大的缺点，并且还具有对入射角度变化不太敏感的优点，满足了实际工程设计的需要．另外这种滤波器还兼具有双极化信号的检测特性，对TE波和TM波有基本一致的频率响应，可以同时检测双极化信号．文中首先根据指标要求给出滤波器结构参数的设计初值，然后通过软件进行仿真优化设计，最后给出一种低损耗的滤波器结构，仿真结果表明设计的滤波器满足系统的性能要求，接着详细分析了透射带插入损耗的主要来源．最后给出了滤波器各个参数的误差灵敏度分析：为实物加工提供了工艺参考．

Abstract：In order to meet the low insertion loss of transmission band and the low reflection loss of reflection band in detection technology of millimeter and sub-millimeter wave, in this paper, we design a frequency selective surface (FSS) filter based on waveguide array structure in the sub-millimeter wave band. Through optimizing the structural parameters, the FSS filter overcomes the drawback that the insertion loss increases at large angle of incidence. Meanwhile the FSS filter is not sensitive to the change of angle of incidence, these make it satisfy the requirements of particular engineering. In addition, the frequency responses of the FSS filter to TE and TM are the same, so it can detect the dual-polarized radiation signals simultaneously. Firstly, we give initial values of structural parameter according to the indicator. Secondly, we simulate and optimized the structure by simulation software. Finally, a new FSS filter with a low insertion loss is given. Simulation results show that the FSS filter meets the system requirements and overcomes the shortcoming of large insertion loss at a large incident angle. Then, we analyze the main source of the insertion loss in transmission band. An error sensitivity analysis of structural parameters of FSS filter is also given, which provides a reference for fabrication.

作者：崔广斌, 苗俊刚, 张勇芳,

关键词：亚毫米波, 准光系统, 频率选择性表面