基于扇形基片集成波导的三频带通滤波器设计

该文提出了一种60°扇形基片集成波导谐振器,然后在谐振器中加载一排金属通孔,对其TM₁₁₀、TM₂₁₀和TM₁₂₀模进行扰动,最后利用扰动后的场模式,在60°扇形基片集成波导谐振器的基础上设计了一款结构紧凑的三频带通滤波器。通过分别引入互补开口环谐振器和源-负载耦合结构,改善了滤波器的频率选择特性。3个通带的中心频率分别为5.61 GHz、7.41 GHz和8.77 GHz,3 dB带宽分别为148 MHz、298 MHz、347 MHz。滤波器的测试与仿真结果基本吻合。

Design of Triple band Bandpass Filter Based on Fan shaped Substrate Integrated Waveguide

In this paper, a 60° fan shaped substrate integrated waveguide resonator is proposed, and then a row of metal vias are loaded into the structure to perturb its TM110, TM210 and TM120 modes. Finally, a compact triple band bandpass filter based on the 60° fan shaped substrate integrated waveguide resonator is designed by using the disturbed field mode. The frequency selection characteristic of the filter is improved by introducing a complementary split ring resonators and source load coupling structure. The center frequencies of the three passbands are 5.61 GHz, 7.41 GHz, and 8.77 GHz respectively, and the 3 dB bandwidths are 148 MHz, 298 MHz, and 347 MHz respectively. The measured results of the filter are in good agreement with that of the simulation.