一种带有寄生通带抑制结构的滤波器设计

Design of a Filter with Spurious PassBand Suppression Configuration

设计了一种平行耦合微带带通滤波器,对主通带的2次、3次谐波,使用半波长开路谐振器,引入传输零点,从而对该滤波器主通带2次、3次谐波处的寄生通带产生抑制作用。该方法能够在结构不做较大改变的情况下,分别对滤波器的3次谐波、2次谐波处寄生通带增加20dB和10dB以上的抑制效果,同时不改变滤波器的通带性能。

This paper designs a parallel-coupled microstrip bandpass filter.It employs half-wave open-ended resonators in view of the 2nd and the 3rd harmonic passband responses and introduces transmission zeros so as to have a suppressing effect on the spurious passband at the 2nd and 3rd harmonics frequency.The method can increase the suppression by 20 dB and over 10 dB on the spurious passband at the 3rd and 2nd harmonic responses,respectively,without major structure modification.