摘要
提出一种基于阶梯阻抗谐振器(SIR)结构的双频带滤波器的设计方法。该方法利用阶梯阻抗结构的谐振频率作为第一个频带,阶梯阻抗谐振器可控的杂散频段作为第二个通频带。利用这一方法设计了一款通带分别位于2.4 GHz和5.8 GHz的双频带滤波器,其工作频带可用于WLAN和雷达系统通信,且具有良好的通带效应和阻带效应,插入损耗在1 d B以下,阻带抑制在-20 d B以下。
A design method for dual-band bandpass filter based on stepped impedance resonator（SIR） is proposed in this paper. This method utilizes the resonance frequency of the SIR as the first pass band, and the controllable spurious resonance frequency as the second one. And a filter operating at 2.4 GHz and 5.8 GHz is designed by this method in this paper, which is suitable for WLAN and radar communication system. And this filter has good effect of passband and stopband, for its insertion loss is lower than 1 d B and its stopband rejection is lower than-20 d B.
关键词
双频带滤波器
微带线
阶梯阻抗谐振器
dual-band BPF
microstrip line
stepped impedance resonator
