一种新型三模宽带带通滤波器的设计

Design of a New Triple Mode Bandband Bandpass Filter

提出了一种基于三模环形谐振器的微带带通滤波器。三模谐振器是由加载开路枝节的环形谐振器组成,在通带内产生三个谐振模式。环形谐振器的多径效应使得信号相抵消,在通带的上下截止频率处产生两个传输零点,因此滤波器会有较好的通带选择性。仿真和测试结果表明,滤波器的中心频率为5.05 GHz,通带频率为4.4-5.7 GHz,带内插损小于1.7 d B。

A microstrip bandpass filter using triplemode ring resonator is presented. By loading with an open stub, the resonator produces three resonant modes in the pass band. Due to the dual path effect of the ring resona-tor, two transmission zeros can be introduced at the upper and lower cutoff frequencies, resulting high passband selectivity. Simulation and experimental results show that the center frequency of filter is 5. 05 GHz, pass band fre-quency is 4. 4 -5. 7 GHz, insertion loss is less thanl. 7 dB in pass band.