基于慢波开环谐振器的双模微带滤波器

A Dual-Mode Microstrip Filter with Slow-Wave Open-Loop Resonator

设计一种新型的基于慢波开环谐振器的双模微带滤波器.该滤波器采用长度变化的微扰方式,增加了开路枝节线作为容性负载,实现了滤波器的小型化设计.与传统结构相比,该滤波器在相同的谐振频率下尺寸减小了19%,具有准椭圆函数响应,在中心频率2.4 GHz处的带宽为4%,且测量和仿真结果比较吻合.

A novel dual-mode microstrip filter with a slow-wave open-loop resonator has been designed. It uses a perturbation arrangement of length change and includes open stubs as capacitive loads, leading to size reduction of the filter. Compared with the traditional dual-mode filter at the same design frequency, the proposed filter can significantly reduce the circuit size of 19%, and possesses a quasi-elliptic response. A bandpass filter with a 4% bandwidth centered at 2.4 GHz has been achieved. The measured results agree well with simulations.