Coupled-line band-pass filter with T-shaped structure for high frequency selectivity and stopband rejection
Coupled-line band-pass filter with T-shaped structure for high frequency selectivity and stopband rejection
复制标题
T 形结构的耦合线带通滤波器，具有高频选择性和阻带抑制功能
DOI：
10.1002/mmce.22259
复制
发表时间：
2020
影响因子：
1.7
通讯作者：
Chen Qiang
中科院分区：
文献类型：
--
作者：
Xu Kai-Da;Lu Sen;Ren Yi;Zhang Anxue;Chen Qiang
提出了一种T形短截线结构的耦合线带通滤波器。通过输入阻抗的计算，实现了滤波器在通带内的5个传输极点和从0到2f0（f0表示滤波器的中心频率）的8个深传输零点。通过简单的T形结构，可以适当调整六个TZs的位置，以实现高频率选择性和阻带抑制。设计并制作了中心频率为2.05 GHz的带通滤波器样机，测试结果表明，该带通滤波器的低阻带抑制水平超过45.5 dB，高阻带抑制水平优于19.5 dB。仿真和实测结果吻合较好，验证了设计思想。
A coupled‐line band‐pass filter (BPF) with T‐shaped stub structure is presented. Five transmission poles within the passband and eight deep transmission zeros (TZs) from 0 to 2f0(f0denotes filter's center frequency) are realized through input impedance calculations. With the simple T‐shaped structure, the positions of six TZs can be appropriately adjusted to achieve high frequency selectivity and stopband rejection. For demonstration, a BPF prototype centered at 2.05 GHz is designed and fabricated, whose measured rejection levels are of over 45.5 dB at lower stopband and better than 19.5 dB at upper stopband. The simulation and measurement results are in good agreement, which validates the design idea.