一种宽阻带窄带腔体滤波器的设计  

Design of a Narrowband Cavity Filter with Wide Attenuation Band

作　　者：李瑞涛 杨青慧[1] 张怀武[1] LI Ruitao;YANG Qinghui;ZHANG Huaiwu(State Key Lab.of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China)

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室

出　　处：《压电与声光》2020年第1期1-3,共3页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(61021061,51272036,51002021,61131005);国际合作基金资助项目(2012DFR10730,2013HH0003,2012CB933104);111基金资助项目(B13042)

摘　　要：该文介绍了一种窄带带通腔体滤波器的原理和设计方法,通过加载电容原理,使滤波器的寄生通带远离通频带,并设计了带哑铃型横杆的谐振器结构,在谐振器连接点形成电压驻波零点,从而进一步抑制滤波器的寄生通带,实现了具有宽阻带的带通腔体滤波器。最后,利用微波仿真软件CST设计了一款中心频率为2.45 GHz,相对带宽为4.08%的窄带带通腔体滤波器。仿真结果表明,滤波器带外抑制高,阻带范围宽,通带内驻波良好,满足设计指标要求。This paper introduced the principle and design method of a narrowband band-pass cavity filter.The parasitic passband was moved away from the passband by increasing the loading capacitance.The resonator with dumbbell-shaped cross-bar was designed to form the zero point of the voltage standing wave at the junction of the resonator in order to suppress the parasitic passband of the filter and to implement a band-pass filter with wide attenuation band.Finally,a band-pass filter with a center frequency of 2.45 GHz and bandwidth of 4.08% was designed using the simulation software CST.The simulation results showed that the designed filter had high out-of-band rejection,wide attenuation band and good performance of voltage standing wave ratio in the passband,which meet the design specifications.

关 键 词：宽阻带 带外抑制 窄带 带通滤波器 腔体 

分 类 号：TN713[电子电信—电路与系统] TM25[一般工业技术—材料科学与工程]