宽阻带高频率选择性的混合电磁耦合滤波器  

Mixed Electromagnetic Coupling Filter with Wide Stopband and High Frequency Selectivity

作　　者：张静[1] 李国辉[1] 谢世濠 卢齐杰 Zhang Jing

机构地区：[1]上海大学通信与信息工程学院,上海200444

出　　处：《工业控制计算机》2024年第9期122-123,158,共3页Industrial Control Computer

摘　　要：在无线和移动通信系统中,需要具有高选择性和结构紧凑的微波滤波器来抑制谐波和杂散信号。提出了一种新颖的基于阶跃阻抗谐振器的二阶可控混合电磁耦合滤波器,该滤波器由两个四分之一波长的阶跃阻抗谐振器组成,混合电磁耦合中的电耦合和磁耦合分别通过低阻抗部分的叉指结构和高阻抗的传导针来控制。同时在馈线上加载两对对称开路短截线,可以产生额外的传输零点,以获得更好的频率选择性和高抑制度的宽阻带。设计并制作了一个滤波器样品,测试的回波损耗大于18 d B,插入损耗为0.6 d B,上阻带拓宽到三倍的中心频率处,整个阻带抑制度优于17 d B,测量和模拟结果吻合良好。In this paper,a novel two-order controllable mixed electromagnetic coupling filter based on step impedance resonator is proposed.The designed filter consists of two one-quarter wavelength step impedance resonators,where the electrical coupling and magnetic coupling in the mixed electromagnetic coupling are controlled by the interdigital structure with low impedance and conduction needle of the high impedance part,respectively.Furthermore,two pairs of open stubs are loaded symmetrically on feeding lines to generate additional transmission zeros for better frequency selectivity and wide stopband with high rejection levels.Finally,the prototype filter is successfully designed and fabricated with the proposed method.The realized return loss is greater than 18 dB with insertion loss of 0.6 dB.Its upper stopband is significantly extended to three times of the center frequency with a suppression level larger than 17 dB.

关 键 词：滤波器 混合电磁耦合 传输零点 宽阻带 

分 类 号：TN713[电子电信—电路与系统]