微带交指带通滤波器小型化结构设计  

A miniaturized microstrip interdigital bandpass filter structure

作　　者：蒋建华 张杨[2] 侯明[2] 李晓珍 JIANG Jianhua;ZHANG Yang;HOU Ming;LI Xiaozhen(Liuzhou Railway Vocational Technical College,Liuzhou 545616,China;Faculty of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650504,China;School of Information Technology,Kunming University,Kunming 650214,China)

机构地区：[1]柳铁铁道职业技术学院,广西柳州545616 [2]昆明理工大学信息工程与自动化学院,云南昆明650504 [3]昆明学院信息技术学院,云南昆明650214

出　　处：《现代电子技术》2025年第1期112-116,共5页Modern Electronics Technique

基　　金：国家自然科学基金项目:无反射滤波器(61864004);广东省质量工程-高等教育教学改革项目(2023-1106);广东理工学院科技项目一般项目(2024YBZK009)。

摘　　要：文中提出在终端短路式交指带通滤波器的开路端引入一段微带加载线,使谐振器产生尺寸跳变。通过改变微带加载线的线宽,增加谐振器的等效电感值,从而实现降低该带通滤波器中心频率的目的,并且给出了在设计指标下,随加载线宽变化中心频率变化的经验公式。对X波段的微带交指带通滤波器和微带线尺寸跳变进行了研究,研究数据表明:谐振器越短,中心频率往高频偏移越多;微带线尺寸跳变越大,中心频率往低频偏移越多。通过合理减小谐振器长度和增加微带加载线线宽,滤波器整体长度减小而宽度不变,且改进前后滤波特性不发生改变,达到了滤波器小型化的目的。通过在HFSS中建立滤波器模型并进行仿真,改进后增加了传输零点,回波损耗更加稳定,谐振器长度减小10%,微带加载线线宽增加0.15 mm,整体滤波器尺寸减小10%,验证了所提出结构的可行性。A microstrip loading line is introduced into the open end of the terminal short-circuit interdigital bandpass filter to make the resonator size jump.By changing the line width of the microstrip loading line,the equivalent inductance value of the resonator is increased,so as to reduce the center frequency of the bandpass filter.The empirical formula based on the design indexes for center frequency variation with the change of loading line width is given.The X-band microstrip interdigital bandpass filter and microstrip line size jump are studied.The data show that the shorter the resonator is,the more the center frequency shifts to high frequency.The larger the microstrip line size jump,the more the center frequency shifts to low frequency.The filter is miniaturized by decreasing the length of the resonator and increasing the line width of the microstrip loading line appropriately,reducing the overall length of the filter and keeping its width unchanged,and maintaining its filtering characteristics unchanged before and after the improvement.The filter model is established in HFSS(high frequency structure simulator)and the simulation is carried out.In the improved model,the number of transmission zeros is increased,the return loss(RL)is more stable,the resonator length is reduced by 10%,the line width of the microstrip loading line is increased by 0.15 mm,and the overall filter size is reduced by 10%,which verifies the feasibility of the proposed structure.

关 键 词：带通滤波器 交指型 微带加载线 小型化 HFSS 谐振器 

分 类 号：TN713-34[电子电信—电路与系统]