一种准无反射带通滤波器  

A quasi-reflectionless bandpass filter

作　　者：张杨[1] 侯明[1] 李小珍 徐开心 胡雨婷 ZHANG Yang;HOU Ming;LI Xiaozhen;XU Kaixin;HU Yuting(School of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650504,P.R.China;School of Information Technology,Kunming University,Kunming 650214,P.R.China)

机构地区：[1]昆明理工大学信息工程与自动化学院,昆明650504 [2]昆明学院信息技术学院,昆明650214

出　　处：《重庆邮电大学学报（自然科学版）》2023年第6期1047-1053,共7页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金项目(61864004)。

摘　　要：针对带通滤波器信号反射影响系统性能的问题,提出了一种紧凑型宽吸收范围的微带准无反射带通滤波器的设计方法。该结构由2部分组成,平行耦合带通作为主通道,电阻和短路谐振器串联而成的吸收式损耗谐振器作为吸收通道。通过这种方式,未在主通带范围内传输的反射信号能量大部分被吸收通道的电阻耗散,从而达到准无反射特性。经过参数化分析,给出了准无反射带通滤波器主通道和吸收通道的设计图表。通过高频电磁仿真软件(high frequency structure simulator,HFSS)仿真验证了一款中心频率为3 GHz,相对带宽为75%的微带准无反射带通滤波器,阻带和通带内的回波损耗在11 dB左右,在阻带内92%左右的反射功率被电阻吸收。通过合理设计吸收式损耗谐振器的位置,使得整体滤波器尺寸为1.64×0.32λ_(g)×λ_(g),满足小型化要求。Addressing the issue of signal reflections impacting the performance of bandpass filters,we propose a design method of a compact microstrip quasi-reflectionless bandpass filter with wide absorption range.The structure is composed of two parts:a parallel-coupled bandpass serving as the main channel and an absorptive loss resonator made of resistors and short-circuit resonators in series,functioning as the absorption channel.After parametric analysis,a simple design method of quasi-reflectionless bandpass filter is given.A microstrip quasi-reflectionless bandpass filter with a center frequency of 3 GHz and a relative bandwidth of 75%is verified by HFSS simulation.The return loss in stopband and passband is about 11 dB,and about 92%of reflected power in stopband is absorbed by resistance.By reasonably designing the position of the absorption loss resonator,the overall filter size is 1.64×0.32λ_(g)×λ_(g),meeting the requirements of miniaturization.

关 键 词：准无反射带通滤波器 吸收损耗谐振器 小型化 宽吸收范围 高频电磁仿真软件(HFSS) 

分 类 号：TN713[电子电信—电路与系统]