基于波纹耦合微带线的可调谐带通滤波器  

Tunable band-pass filter based on corrugated microstrip coupled lines

作　　者：徐珊 邢孟江[1] 金建辉[1] 李小珍 张磊[1] XU Shan;XING Mengjiang;JIN Jianhui;LI Xiaozhen;ZHANG Lei(School of Information and Automation,Kunming University of Science and Technology,Kunming 650504,China;School of Information and Technology,Kunming Institute,Kunming 650214,China)

机构地区：[1]昆明理工大学信息工程与自动化学院,云南昆明650504 [2]昆明学院信息技术学院,云南昆明650214

出　　处：《电子元件与材料》2020年第4期75-79,共5页Electronic Components And Materials

基　　金：国家自然科学基金(61564005,61864004)。

摘　　要：设计了一种紧凑5阶双零点可调谐带通滤波器。通过在传统梳状线滤波器中引入波纹耦合微带线结构,该滤波器可以在中心频率调谐过程中保持绝对带宽恒定,同时尺寸相较于传统方法可减小50%。谐振器中引入分布式补偿电容利于滤波器应用于高介电常数衬底的微带线结构。基于源与负载间的耦合,引入两个传输零点来提高滤波器的衰减特性。HFSS仿真结果显示,当加载的电容值为2.43 pF时,滤波器的中心频率为1.48 GHz,带宽为194 MHz,插入损耗为1.36 dB。随着加载电容值从2.15 pF增加到2.93 pF,滤波器的中心频率从1.55 GHz减小至1.37 GHz。保持绝对带宽恒定的情况下,通带内的插入损耗小于1.5 dB。A compact 5th-order double-zero tunable band-pass filter was designed.The constant absolute bandwidth was achieved using a novel corrugated microstrip coupled lines approach,which reduces the size of the filter by 50%compared with conventional methods.The localized capacitive compensation between resonators facilitated the application of the microstrip structure on substrate of high dielectric constant.Two transmission zeros were obtained due to the coupling between the source and the load,which improves the attenuation characteristics of the filter during tuning.The HFSS simulation gives the central frequency of 1.48 GHz,the bandwidth of 194 MHz and the insertion loss of 1.36 dB at the loaded capacitance of 2.43 pF.As the load capacitance was increased from 2.15 pF to 2.93 pF,the central frequency of the filter decreases from 1.55 GHz to 1.37 GHz.And the in-band insertion loss is less than 1.5 dB while keeping constant absolute bandwidth.

关 键 词：可调谐滤波器 波纹耦合微带线 梳状线滤波器 绝对带宽恒定 补偿电容 小型化 

分 类 号：TN713[电子电信—电路与系统]