Design of K-Band Substrate Integrated Waveguide Band-Pass Filter with High Rejection

Abstract This article presents the design of K-band Substrate Integrated Waveguide (SIW) Band-pass filter with high rejection, by using the topology with iris and the SIW resonators. The simulated results of this filter have shown that the passband is from 17.3 GHz to 19.3 GHz, while the insertion loss is 1.35 dB within 10.9 % bandwidth around 18.3 GHz and input return loss in the passband is better than 15 dB, with high rejection of -57.88 dB at the frequency 24.07 GH. All the structures are designed on a single substrate of Rogers R04003 permittivity 3.55. The compatibility with planar circuits is provided via a specific microstrip transition (microstrip tapered transitions).摘要 本文提出了一款高抑制度K波段基片集成波导（Substrate Integrated Waveguide，SIW）带通滤波器的设计方案，采用膜片拓扑结构与SIW谐振器相结合的方式。该滤波器的仿真结果表明，其通带范围为17.3 GHz至19.3 GHz；在中心频率18.3 GHz附近10.9%的带宽内，插入损耗为1.35 dB，通带内输入回波损耗优于15 dB，且在24.07 GHz处可实现-57.88 dB的高抑制度。所有结构均设计于介电常数为3.55的Rogers R04003单一基板之上，并通过专用微带渐变过渡（microstrip tapered transitions）实现与平面电路的兼容性。