基于TM110模式基片集成波导5G窄带滤波器设计

Design of 5G narrowband filter based on TM110 mode substrate integrated waveguide

基于基片集成波导技术(SIW),设计优化5G滤波器。波导传输方向上采用TE10主模式,保证模式纯净;谐振压制模块采用TM110模式,提取所需频段信号;设计调谐匹配过渡结构,有效降低回波损耗;调谐耦合窗口大小,充分激励谐振模式。在3.5 GHz频段(带宽40 MHz),带内回波损耗优于-15 dB,插入损耗优于-1 dB。采用电磁模拟仿真的方法,探索高次模式在滤波器设计中的应用,在预设模式和频段下优化滤波器结构及尺寸。

Based on the technology of substrate integrated waveguide,a 5G filter is designed and optimized.TE10 mode is used in the main transmission direction;TM110 mode is used in the cavity to extract the required frequency band signals;tuning matching transition structure is designed to reduce the reflection loss;and the size of tuning coupling window is used to fully stimulate the resonant mode.In 3.5 GHz bandwidth(40MHz),the reflection loss is better than-15dB,and the insertion loss better than-1dB.The method of high-order mode in filter design is explored by electromagnetic simulation.The structure and size of filter are optimized in preset mode and frequency band.