Compact Integrated Lumped-Element Bandpass Filter Loaded with Defected Ground Structure Based on Multilayer Liquid Crystal Polymer Substrate  

作　　者：LIU Weihong CHEN Yuan HUANG Qian LIU Qingran 刘维红;陈元;黄倩;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227-232,共6页上海交通大学学报(英文版)

基　　金：the Shaanxi Provincial Key Research and Development Program(No.2020GY-040)。

摘　　要：Design of a miniaturized lumped-element bandpass filter in multilayer liquid crystal polymer technology is proposed.Fractional bandwidth of the bandpass filter is 20%,operating at a center frequency of 500 MHz.In order to further reduce the size and improve the performance of the proposed filter,defected ground structure(DGS)has been implemented in the filter.Based on this structure,the volume of the inductor is reduced by 60%eficiently compared with the inductor without DGS,and the Q-factor is increased up to 257%compared with the traditional multilayer spiral inductor.The measured results indicate that the designed filter has a very sharp stopband,an insertion loss of 2.3dB,and a return loss of 18.6dB in the passband.The whole volume of the fabricated filter is 0.032入_(g)×0.05入_(g)×0.00075入_(g),where Ag is the guided wavelength of the center frequency.The proposed filter is easily integrated into radio-frequency/microwave circuitry at a low manufacturing cost,especially wireless communication.

关 键 词：multilayer liquid crystal polymer defected ground structure bandpass filter MINIATURIZATION lumped element 

分 类 号：TN713[电子电信—电路与系统]