Novel Compact Dual-Band Bandpass Filter Based on Multilayer Liquid Crystal Polymer Substrate  

作　　者：LIU Weihong LIU Qingran 刘维红;刘清冉

机构地区：[1]School of Electronic Engineering,Xi'an University of Posts and Telecommunications,Xi'an 710121,China

出　　处：《Journal of Shanghai Jiaotong university(Science)》2025年第2期233-238,共6页上海交通大学学报(英文版)

基　　金：the Shaanxi Provincial Innovation Team Project(No.2020TD-019);the Xi'an Sciences Plan Project(No.2021XJZZ0075)。

摘　　要：In this paper,a compact defected ground structure loaded ultra high frequency dual-band bandpass flter is designed and implemented based on multilayer liquid crystal polymer technology.This novel filter is simply composed with several lumped and semi-lumped elements,to create a dual-passband response.In order to enhance the out-of-band rejection,a feedback capacitor C_(z) at the in/out ports of the filter is introduced,and four transmission zeros(TZs)are obtained outside the pass band.Furthermore,the position of TZs can be determined by adjusting the value of C_(z).The schematic and design process of the filter are given in this paper.The center frequencies of dual-band bandpass filter are 0.9 GHz and 2.45 GHz,and the 3-dB bandwidths are 13.7%and 14.3%,respectively.The circuit size is 11 mm×9.5 mm×0.193 mm.The proposed filter has been fabricated and tested,and the measured result is in good agreement with the simulation result.

关 键 词：dual-band bandpass filter multilayer liquid crystal polymer defected ground structure 

分 类 号：TN713[电子电信—电路与系统]