| 摘要: |
| 通过悬置微带传输线结构进行了无反射滤波器的研究和设计。首先利用耦合线结构设计了中心频率为3.92 GHz，插入损耗为0.32 dB，在0.1~10 GHz内回波损耗超过11.6 dB，中心频率处超过38 dB的双端口无反射带通滤波器；又利用λ/4开路谐振器和λ/4短路谐振器作为滤波单元，设计了中心频率为4.25 GHz，回波损耗在1.5~6 GHz内超过11 dB，在中心频率处超过40 dB的双端口无反射带阻滤波器。所提出的这两款无反射滤波器具有无反射频带范围宽、工作频带内玈11衰减大、多层自封装等突出优点。 |
| 关键词: 无反射带通滤波器 无反射带阻滤波器 悬置微带线 耦合线 λ/4谐振器 |
| DOI：10.20079/j.issn.1001-893x.220802001 |
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| 基金项目:国家自然科学基金面上项目（61871458） |
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| Reflectionless Filter Based on Suspended Microstrip Structure |
| YANG Mengyang,XIAO Jiankang,LI Xiaofang |
| (School of Electro-Mechanical Engineering,Xidian University,Xi’an 710071,China) |
| Abstract: |
| The authors research and design reflectionless filters based on the suspended microstrip transmission line structure.By using the coupling line,a dual-port reflectionless bandpass filter is designed with center frequency of 3.92 GHz,insertion loss of 0.32 dB,return loss of more than 11.6 dB in the overall range of 0.1~10 GHz,and return loss of more than 38 dB at the center frequency.At the same time,using λ/4 open-circuited and short-circuited resonators as the basic unit,a dual-port reflectionless bandstop filter is designed with center frequency of 4.25 GHz,return loss of more than 11 dB from 1.5 GHz to 6 GHz,and return loss of more than 40 dB at the center frequency.The proposed reflectionless filters have such outstanding advantages as wide reflectionless frequency band,favorable 玈11 attenuation in working band,and multi-layer self-packaging. |
| Key words: reflectionless bandpass filter reflectionless bandstop filter suspended microstrip line coupled line λ/4 resonator |
