摘要
提出一种简单结构的双频带带通滤波器,由不等长十字形谐振器和平行耦合线馈电结构组成.由于滤波器分布电路具有对称性,首先利用奇偶模分析法对带通滤波器奇偶模输入阻抗、传输零点和传输极点进行分析.所设计的滤波器具有3个传输零点和4个传输极点.传输零点的位置不随阻抗参数的变化而变化.在4个传输极点中,第1个偶模传输极点和第1个奇模传输极点构成了第1个通带,剩下2个传输极点构成了第2个通带.与等长十字形谐振器滤波器相比,该结构多了一个极点.滤波器的通带带宽可以通过调节传输极点位置进行调整.给出了滤波器实物的结构参数,并且利用仿真软件进行仿真优化,得到了滤波器插入损耗和回波损耗的仿真结果.制作和测试了滤波器,给出了测试结果.仿真结果和测试结果基本上一致,验证了设计理论的正确性.
A simple dual-band band-pass filter is proposed. It is composed of an unequal-length crossshaped resonator and parallel coupled lines feed structures. Due to the symmetry of the filter distribution circuit,the transmission zero and transmission pole are analyzed using the even-odd mode analysis method. The designed filter has 3 transmission zeros and 4 transmission poles. The positions of the transmission zeros do not change with the changing of the impedance parameters. Among 4 transmission poles,the first even-mode transmission pole and the first odd-mode transmission pole constitute the first passband,and the remaining two transmission poles constitute the second passband. Compared with the equal-length cross-shaped filter,this structure has one extra transmission pole. The passband bandwidth can be adjusted by adjusting the position of the transmission poles. Then the physical parameters of the designed filter are given. The simulated results of the designed filter are obtained. Finally,the designed filter is fabricated and measured. Simulations are basically consistent with the measured ones,which verify the correctness of the design theory.
作者
喇东升
关鑫
李钰莹
李弘诚
郭经纬
LA Dong-sheng;GUAN Xin;LI Yu-ying;LI Hong-cheng;GUO Jing-wei(School of Computer and Communication Engineering,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing,Guilin University of Electronic Technology,Guilin 541004,China;School of Information Science and Engineering,Yanshan University,Qinhuangdao 066004,China)
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2020年第4期27-31,共5页
Journal of Beijing University of Posts and Telecommunications
基金
国家自然科学基金项目(61501100)
中央高校基本科研业务专项资金项目(N2023017)
广西无线宽带通信与信号处理重点实验室开放基金项目(GXKL06180201)
河北省自然科学基金项目(F2019203012)。
关键词
不等长十字形谐振器
双频带带通滤波器
传输极点
传输零点
unequal length cross-shaped resonator
dual-band band-pass filter
transmission pole
transmission zero
