基于倒π型谐振器的双陷波微型超宽带滤波器设计  

Design of Double-notched Micro UWB Filter Based on Invertedπ-type Resonator

作　　者：高明明[1,2] 徐克达 房少军 南敬昌[1] 刘超[1] GAO Mingming;XU Keda;FANG Shaojun;NAN Jingchang;LIU Chao(Liaoning Technical Universily School of Electronics and Information Engineering,Huludao,Liaoning,125105,CHN;Dalian Maritime University School of Information Science and Technology,Dalian,Liaoning.116026,CHN)

机构地区：[1]辽宁工程技术大学电子与信息工程学院,辽宁葫芦岛125105 [2]大连海事大学信息科学技术学院,辽宁大连116026

出　　处：《固体电子学研究与进展》2020年第4期258-263,304,共7页Research & Progress of SSE

基　　金：国家自然科学基金资助项目(61701211);辽宁省特聘教授项目(551806006);辽宁省高校重点实验室项目(LJZS007)。

摘　　要：针对传统的超宽带滤波器设计尺寸偏大和陷波深度不足的问题,提出了一种基于倒π型谐振器的双陷波超宽带滤波器。通过在超宽带滤波器两端加载宽型开路枝节在通带内形成传输零点,并在滤波器上方耦合倒π型谐振器,实现通带内的双陷波特性。选用高介电常数的基板材料大幅度缩小滤波器的整体设计尺寸,实现微型化设计。测试结果表明,该滤波器通带范围为2.9~12.0 GHz,通带内插入损耗在1 dB以内,在5.76~6.14 GHz和7.82~8.45 GHz陷波深度分别达到了-20.6 dB和-31.6 dB。测试结果和仿真结果基本一致,说明该滤波器在通带内能够有效地避免无线局域网WLAN信号(5.725~5.850 GHz)和X波段卫星信号(7.900~8.395 GHz)的干扰,为平面型陷波超宽带滤波器的设计提供了新的思路。Aiming to solve the problems of large design size and insufficient notch depth for traditional ultra-wideband filters,a double-notched ultra-wideband filter based on invertedπ-type resonator was proposed.Double-notched characteristics in the passband were achieved by loading a wide opencircuit stub at both ends of the ultra-wideband filter to form a transmission zero in the passband and coupling an invertedπ-type resonator above the filter.A high dielectric constant substrate was used to reduce the overall design size of the filter and realize the miniaturization design of double-notched ultrawideband filters.Test results show that the passband range of ultra-wideband filter is 2.9~12.0 GHz,the insertion loss in the passband is within 1 dB,and the double-notched depths reach-20.6 dB and-31.6 dB at 5.76~6.14 GHz and 7.82~8.45 GHz respectively.The measurement results are basically consistent with the simulation results,indicating that the filter can avoid the interference of the WLAN signal(5.725~5.850 GHz)and the X-band satellite signal(7.900~8.395 GHz)effectively in the passband,and providing new ideas for planar notched ultra-wideband filter.

关 键 词：超宽带滤波器 开路枝节 倒π型谐振器 微型化 双陷波 

分 类 号：TN713[电子电信—电路与系统]