基于SIW技术的毫米波滤波器研究与设计

基于基片集成波导（substrate integrated waveguide，SIW）结构设计了两款四阶的耦合带通滤波器，使用三维全波电磁场仿真软件HFSS对设计的两款滤波器进行了仿真设计和优化.由仿真结果分析得出，两款滤波器的工作频率均位于毫米波频段.第一款SIW滤波器实现了切比雪夫型响应，中心频率为20 GHz，带宽为2 GHz，通带内的插入损耗低于1.5 dB，回波损耗低于-20 dB，在阻带中对信号的衰减程度可以达到50 dB.第二款SIW滤波器实现了准椭圆函数型的响应，中心频率为29.1 GHz，带宽为300 MHz，通带内的插入损耗低于1 dB，回波损耗低于-20 dB，在通带到阻带的过渡中实现了两个陷波点.仿真结果表明，在毫米波滤波器设计中引入SIW结构，有利于优化滤波器尺寸，得到较好的滤波器性能指标，是毫米波滤波器发展的一个重要方向.

Research and design of millimeter-wave filter based on SIW technology

In this paper, two fourth-order coupled bandpass filters are designed based on the substrate integrated waveguide (SIW) structure. Three-dimensional full-wave electromagnetic field simulation software-high frequency structure simulator (HFSS) was used to simulate, design and optimize the two designed filters. According to the analysis of the simulation results, the two filters operate at millimeter-wave band. The first one realizes the Chebyshev type response with a center frequency of 20 GHz, a bandwidth of 2 GHz, insertion loss within passband less than 1.5 dB, return loss less than -20 dB and the attenuation of the signal in the stopband can reach 50 dB. The other one realizes the quasi-elliptic functional response with a center frequency of 29.1 GHz, a bandwidth of 300 MHz, insertion loss within passband less than 1 dB, return loss less than -20 dB and two notches are implemented in the transition of passband to stopband. The simulation results show that the introduction of substrate integrated waveguide structure in the millimeter wave filter design is conducive to optimize the filter size and obtain better filter performance, which is an important direction in the development of millimeter wave filter.