一种高性能微带三通带滤波器设计

Design of a high-performance microstrip tri-band BPF

提出了一个由加载开路存根的S型阶跃谐振腔结构组成的三通带微带滤波器设计方案.该结构以阶跃谐振腔为主体,并在其基础上附加阶跃开路存根.普通阶跃谐振腔结构是一个典型的双模谐振腔,文中正是利用这个性质来生成双通带.同时附加阶跃开路存根被用来构成了第3个通带.仿真结果显示,滤波器分别在2.4、3.85和5.2 GHz,同时阻带特征低于-30 dB.结果表明,该滤波器可以很好覆盖WLAN和Wimax通信,具有很好的应用空间.

This paper presents a design of tri-band microstrip filter with a S-type step resonant cavity structure which is loaded with open stub. The structure contains step resonant cavity mainly, and additional step open circuited stub. Common step resonant cavity is a typical dual-mode resonator, two bands are thus generated based on this characteristic, and the additional step open circuited stub is used to generate the third pass band. The simulation results show that when the filter is at 2.4GHz, 3.85GHz and 5.2GHz, respectively, and the stop band is lower than -30dB, the filter can cover WLAN and Wimax communication very well, having a good prospect of application.