新型基片集成波导宽带带通滤波器

A novel substrate integrated waveguide broadband bandpass filter

利用基片集成波导的高通传输特性以及光子带隙结构的阻带特性,构建了一种新型结构的基片集成波导带通滤波器。为了验证该想法,设计了1个中心频率为5.0GHz,分数带宽为60%的滤波器,电磁仿真结果表明该滤波器在频率为3.5～6.5GHz频率范围内具有明显的通带特性,带内最大插入损耗约为0.64dB.利用PCB工艺制作了该滤波器的实物,使用矢量网络分析仪对其进行了测试,测试结果表明该滤波器的通带为3.8～6.8GHz,分数带宽约为56%,带内最小插入损耗为1.6dB。电磁仿真结果和实际测试结果较一致。

A novel broadband substrate integrated waveguide bandpass filter is presented based on the highpass characteristics of substrate integrated waveguide （SIW） and the bandstop performance of photonic band gap （PBG） structure.In order to verify it,a wideband bandpass filter with center frequency of 5.0 GHz and fractional bandwidth of 60% is designed. The electromagnetic simulation results show its good passband characteristics from 3.5 GHz to 6.5 GHz,and the maximun insertion loss is about 0.64 dB. An experimental filter prototype is fabricated with standard PCB technics and measured with the vector network analyzer. The measured results show the passband is from 3.8 GHz to 6.8 GHz,the fractional bandwidth is about 56%,and the minimal insertion loss is about 1.6 dB. The measured results are in good agreement with the simulated results.