CN107359393A - 超宽带微带带通滤波器 - Google Patents

超宽带微带带通滤波器 Download PDF

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CN107359393A
CN107359393A CN201710720732.1A CN201710720732A CN107359393A CN 107359393 A CN107359393 A CN 107359393A CN 201710720732 A CN201710720732 A CN 201710720732A CN 107359393 A CN107359393 A CN 107359393A
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CN107359393B (zh
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蔡超波
宋树祥
袁伟强
王斌
王宜瑜
胡文灿
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Guilin Hengyi Jinyu Communication Technology Co ltd
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Guangxi Normal University
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • H01P1/20327—Electromagnetic interstage coupling
    • H01P1/20354—Non-comb or non-interdigital filters

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Abstract

本发明公开了一种超宽带微带带通滤波器，所述带通滤波器包括由3个H形缺陷微带结构级联所构成的低通滤波器，再分别于低通滤波器输入、输出端口的微带线上加以四分之一波长终端短路谐振器。本发明的相对带宽达到了116％，‑20dB高频阻带达7GHz，比其他现有技术方案的相应数据要宽很多，尺寸也较其他的小，具有整体性能良好、结构紧凑、插入损耗小、阻带宽等优点，非常适合用于高密度单片微波集成电路的设计。

Description

超宽带微带带通滤波器
技术领域
本发明涉及通讯器件，具体涉及一种超宽带微带带通滤波器。
背景技术
超宽带滤波器作为建立超宽带电路和系统不可或缺的器件，其发展非常迅速。为了设计小型化、低插入损耗、宽阻带的滤波器，开发者进行了大量的研究[1-6]。文献[1]公开了采用低通滤波器与高通滤波器级联的方式实现带通滤波，该滤波器带外抑制较好，但是其结构复杂、尺寸较大，不便于设计与集成。文献[2-4]采用枝节加载与平行耦合线结构构成超宽带滤波器，其通带插入损耗小，阻带性能也较好，但其尺寸较大。文献[5]介绍了通过并联开路与短路枝节线的形式构成超宽带滤波器，该方法结构简单，但是其带外抑制不够，阻带较窄。
发明内容
本发明提供一种由缺陷微带结构的低通滤波器与短路谐振器级联而构成的超宽带带通滤波器。本发明由DMS结构的低通滤波器构成超宽带滤波器的上限截止频率，通过加载短路枝节线，构成滤波器的下限截止频率，本发明的优选方案的相对带宽达到了116％，-20dB高频阻带达7GHz，比其他现有技术方案的相应数据要宽很多，尺寸也较其他文献公开的要小，具有整体性能良好、结构紧凑、插入损耗小、阻带宽等优点，非常适合用于高密度单片微波集成电路的设计。
本发明由低通滤波器与短路枝节线级联而来，低通滤波器优选截止频率ωc＝10.6GHz,采用DMS结构。DMS结构是在传统微带线上蚀刻出缺陷图案，通过在微带线上进行刻槽，改变了微带线的有效介电常数，增加了微带线的电长度，从而改变了微带线的特性。低通滤波器由3个H形DMS结构级联所构成，再分别于低通滤波器输入、输出端口的微带线上加以四分之一波长终端短路谐振器。
附图说明
图1为H形DMS微带结构图。
图2为本发明中的低通滤波器结构图。
图3为本发明的结构图。
图4为本发明的S参数仿真结果与实测结果对比图。
图5为本发明的实物照片。
具体实施方式
下面给出一个优化的具体实施例，用以详细说明本发明的技术方案以及获得的有益效果。
如图1所示。L1、W1分别为输入、输出端口微带线的长和宽，L2、W2分别为待蚀刻的微带线的长和宽，L3、W3分别为蚀刻的H形槽线的上下槽线的长和宽，L4、W4分别为中间槽线的长和宽。本发明采用3个DMS结构级联的方式，获得了截止频率在10.6GHz、阻带宽度大于7GHz的低通滤波器，其结构如图2所示。将3个DMS结构级联的低通滤波器与四分之一波长终端短路谐振器级联，具体就是分别在输入、输出端口的50Ω微带线上加以终端短路谐振器从而得到超宽带微带带通滤波器，如图3所示。本发明在0GHz以及13GHz处产生2个零点，从而得到带通滤波器的下限截止频率与上限截止频率；在4GHz和9GHz处产生2个极点，提高了滤波器的回波损耗，进而改善了滤波器的插入损耗，使其值尽可能小。
下面给出本发明的优选方案，可以使获得的效果最大化。
3个H形缺陷微带结构中的第一个H形缺陷微带结构的上下2个槽线的长度L3′＝2.3mm以及宽度W3′＝0.4mm；中间槽线的长度L4′＝2.7mm以及宽度W4′＝0.25mm。第二个H形缺陷微带结构的上下2个槽线的长度L3″＝2.3mm以及宽度W3″＝0.4mm；中间槽线的长度L4″＝3.2mm以及宽度W4″＝0.3mm。第三个H形缺陷微带结构的上下2个槽线的长度L3″′＝2.3mm以及宽度W3″′＝0.4mm；中间槽线的长度L4″′＝2.7mm以及宽度W4″′＝0.25mm。四分之一波长终端短路谐振器的长度和宽度分别为3.3mm和0.2mm。
通过ADS(advanceddesignsystem)软件仿真，仿真结果如图4所示，S21为滤波器的插入损耗，S11为滤波器的回波损耗。可以看出,本发明提供的带通滤波器的通带为2.9～10.6GHz，相对带宽FBW为116％，通带内的插入损耗小于1dB，同时通过加入终端短路谐振器在13GHz处产生一个零点，增加了带通滤波器的阻带宽度，阻带在-20dB以下的频段为12～19GHz，其宽度达到了7GHz，同时减小了带通滤波器的通带插入损耗。加工得到的带通滤波器实物如图5所示，该带通滤波器尺寸为13.7mm×6.8mm，利用安捷伦N5230C网络分析仪对设计的滤波器进行测试，参数如图4所示。
测试结果与各文献公开的方案对比见下表1，本发明提供的带通滤波器-20dB高频阻带有7GHz，比其他文献公开的要宽许多，尺寸也较其他的小。
表1测试结果与参考文献结果对比
注：-表示未提及。
参考文献：
[1]SUCF,QIXQ,YANGZB.DesignofUWBbandpassfilterusinghighpassand dual-planeEBGlowpassfilters[C]//Proceedingofthe2013IEEEInternationalConferenceonAppliedSuperconductivityandElectromagneticDevices(ASEMD).Piscataway,NJ:IEEEPress,2013:149-152.
[2]CHUQX,TIANXK.DesignofUWBbandpassfilterusingstepped-impedance stub-loadedresonator[J].IEEEMicrowaveandWirelessComponentsLetters,2010,20(9):501-503.
[3]FANL,ZHAOYJ,QINHB,etal.AUWBfilterdesignbasedonsteppedimpedanceresonator[C]//Proceedingofthe9thInternationalSymposiumon Antennas，PropagationandEMTheory(ISAPE).Piscataway,NJ:IEEE Press,2010:974-976.
[4]CHENCP,TAKAHASHIJ,IINUMAR,etal.DesignofUWBfilterwithSIRsandparallel-coupledthreelines[C]//Proceedingofthe2011China-JapanJointMicrowaveConference.Piscataway,NJ:IEEEPress,2011:1-4.
[5]黄晓东,金秀华,程崇虎.一种小型化超宽带微带带通滤波器[J].中国科技论文,2013(10):955-958.
[6]杨虹,陈静,刘云龙,等.一种基于多模谐振器的超宽带带通滤波器设计[J].电子元件与材料,2015(6):61-65.

Claims (2)

1.一种超宽带微带带通滤波器，包括低通滤波器，其特征在于：所述低通滤波器由3个H形缺陷微带结构级联所构成，再分别于低通滤波器输入、输出端口的微带线上加以四分之一波长终端短路谐振器。
2.根据权利要求1所述的超宽带微带带通滤波器，其特征在于：所述3个H形缺陷微带结构中的第一个H形缺陷微带结构的上下2个槽线的长度L3′＝2.3mm以及宽度W3′＝0.4mm；中间槽线的长度L4′＝2.7mm以及宽度W4′＝0.25mm；第二个H形缺陷微带结构的上下2个槽线的长度L3″＝2.3mm以及宽度W3″＝0.4mm；中间槽线的长度L4″＝3.2mm以及宽度W4″＝0.3mm；第三个H形缺陷微带结构的上下2个槽线的长度L3″′＝2.3mm以及宽度W3″′＝0.4mm；中间槽线的长度L4″′＝2.7mm以及宽度W4″′＝0.25mm；四分之一波长终端短路谐振器的长度和宽度分别为3.3mm和0.2mm。
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CN114122653A (zh) * 2021-11-26 2022-03-01 电子科技大学 一种应用于5g频段的超宽带带通滤波器的实现方法

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CN114122653A (zh) * 2021-11-26 2022-03-01 电子科技大学 一种应用于5g频段的超宽带带通滤波器的实现方法
CN114122653B (zh) * 2021-11-26 2022-12-23 电子科技大学 一种应用于5g频段的超宽带带通滤波器的实现方法

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