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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.
In order to meet the needs of low insertion loss of transmissive band and reflection loss of reflection band, a kind of frequency selective filter based on waveguide array structure is designed in the millimeter wave and sub-millimeter band detection technology. Through the optimization design of the structural parameters, Overcomes the shortcoming that the insertion loss of the transmission band under a large angle of incidence is large, and also has the advantage of being less sensitive to the change of the incident angle and meets the requirements of actual engineering design. In addition, this filter also has the detection of the dual polarization signal Characteristics of the TE wave and TM wave have basically the same frequency response, can detect dual-polarized signals at the same time.Firstly, according to the requirements of the index given design parameters of the filter initial value, and then through the software simulation optimization design, and finally given A low-loss filter structure is proposed, the simulation results show that the designed filter meets the performance requirements of the system, and then the main sources of the insertion loss of the transmission band are analyzed in detail.Finally, the error sensitivity analysis of each parameter of the filter is given, Provides a process reference.