一种传输零点可调谐的可调带通滤波器  

A tunable bandpass filter with tunable transmission zeros

作　　者：陆雪杰 张忠海[1] 张海鹏 LU Xuejie;ZHANG Zhonghai;ZHANG Haipeng(School of Electronic Information,Hangzhou Dianzi University,Hangzhou Zhejiang 310018,China;School of Physics and Electronic Information,Shangrao Normal University,Shangrao Jiangxi 334001,China)

机构地区：[1]杭州电子科技大学电子信息学院,浙江杭州310018 [2]上饶师范学院物理与电子信息学院,江西上饶334001

出　　处：《杭州电子科技大学学报（自然科学版）》2021年第3期12-17,共6页Journal of Hangzhou Dianzi University：Natural Sciences

基　　金：国家自然科学基金资助项目(61801153)。

摘　　要：为了提高可调谐滤波器的带外抑制特性,设计一种改进输入输出结构的可调谐带通滤波器。在输入输出端引入可调谐并联谐振回路,在邻近通带频率处引入2个连续可调谐的传输零点,改善了带外抑制性能。设计加工基于U型开口环谐振器的3阶可调谐滤波器,测试结果表明,设计的可调谐滤波器的中心频率范围为390~540 MHz,邻近通带两侧的2个连续可调传输零点的调谐范围分别为590~666 MHz和245~310 MHz,仿真结果与测试结果吻合良好。In order to improve the out-of-band suppression performance of the tunable filter,a tunable bandpass filter with improved input and output structure is designed.Through inserting a tunable parallel resonant circuit at the input and output resonators,and two continuous tunable transmission zeros can be introduced near the passband which can improve the out-of-band suppression performance.A third-order tunable filter based on the U-shaped split ring is designed and processed.The measured results show that the center frequency of the implemented tunable filter ranges from 390 to 540 MHz,which is adjacent to two continuous adjustable transmission zeros on both sides of the passband with the tuning ranges of 590 to 666 MHz and 245 to 310 MHz respectively.The simulated results of the filter are in good agreement with the measured ones.

关 键 词：可调传输零点 频率选择性 可调滤波器 

分 类 号：TN713.5[电子电信—电路与系统]