一种新型的悬置带状线带阻滤波器设计  

A novel design of bandstop filter using a suspended stripline

作　　者：余泽 和历阳 许立强 刘长军[1] YU Ze;HE Liyang;XU Liqiang;LIU Changjun(School of Electronics and Information Engineering,Sichuan University,Chengdu 610064,China)

机构地区：[1]四川大学电子信息学院,四川成都610064

出　　处：《应用科技》2020年第1期37-40,共4页Applied Science and Technology

基　　金：国家自然科学基金项目(61271074).

摘　　要：为了构造高性能带阻滤波器,本文提出了在悬置带状线(SSL)的金属外壳中构造矩形腔谐振腔的方法,形成具有带阻特性的悬置带状线传输线。通过在悬置带状线的上方引入深度为λ_g/4的矩形腔谐振腔,可以产生特定频率的传输零点,并且不影响SSL的传输特性。本文设计了一款Ku波段的悬置带状线带阻滤波器,阻带中心频率为12.5 GHz,阻带带宽为1.35 GHz,阻带衰减大于25 dB。通过调节矩形腔谐振腔的尺寸,滤波器可以灵活地抑制对应的干扰信号。矩形腔谐振腔结构紧凑,不额外占用悬置带状线贴片上的空间,谐振频点易于控制。该悬置带状线滤波器具有良好的工程应用前景。Inorder to realize high performance band-stop filter,a rectangular cavity resonator is built in the metal grounded shell of a suspended stripline to present the band-stop characteristic.Aλg/4 rectangular cavity resonator above the suspended stripline produces a transmission zero at a specific frequency without affecting the transmission characteristics at other frequencies.Based on the purposed resonator,a bandstop filter using the suspended stripline is designed in Ku band.The filter owns a stopband with a center frequency at 12.5 GHz and a bandwidth of 1.35 GHz.The stopband attenuation is more than 25 dB.By varying the dimension of rectangular cavity resonator,the bandstop filter may suppress interfering signals in corresponding frequency band.The rectangular cavity resonator is compact,saves space for the suspended stripline patch.It is easy to control the resonance frequency.It owns a good engineering application prospect in the suspended stripline filters.

关 键 词：悬置带状线 矩形腔谐振腔 带阻特性 传输零点 谐振结构 带阻滤波器 KU波段 结构紧凑 

分 类 号：TN815[电子电信—信息与通信工程]