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应用科学学报 ›› 2009, Vol. 27 ›› Issue (6): 612-615.

• 电子技术 • 上一篇    下一篇

用SIR型开路枝节实现低通滤波器小型化和宽阻带

王华红， 杨雪霞， 高艳艳， 孙晓萌   

  1. 上海大学特种光纤与光接入网省部共建重点实验室，上海200072
  • 收稿日期:2008-12-19 修回日期:2009-10-19 出版日期:2009-11-25 发布日期:2009-11-30
  • 作者简介:杨雪霞，教授，博导，研究方向：微波输能、计算电磁学、微带天线，Email：xxyang@staff.shu.edu.cn
  • 基金资助:

    上海市重点学科和科委重点实验室项目基金(No.S30108, No.08DZ2231100)资助

 Realization of Miniaturization and Band Broadening of Lowpass Filter Using SIR Open-Stub

WANG Hua-hong, YANG Xue-xia, GAO Yan-yan, SUN Xiao-meng   

  1. Key Laboratory of Specialty Fiber Optics and Optical Access Network, Shanghai University, Shanghai 200072, China
  • Received:2008-12-19 Revised:2009-10-19 Online:2009-11-25 Published:2009-11-30

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被引次数

4

摘要：

该文提出一种新型阶跃阻抗谐振器(SIR)型低通滤波器. 设计SIR开路枝节结构，使之具有二阶低通滤波器的
特性，从而达到损耗低、阻带宽、结构紧凑，能很好地改善带外抑制，提高频率选择性. 实验测得通带内的插入损耗均
在-0.3 dB以内，插入损耗大于15 dB的阻带宽度达到9 GHz, 而3 dB截止频率是7.2 GHz. 这种谐振器可广泛用于各种
微波系统中. 给出了该二阶低通滤波器的等效电路和电路参数，电路仿真、全波电磁仿真和实测结果基本上吻合. 为了
进一步增加阻带带宽，抑制高次谐波，又提出一种带SIR开路枝节和倒T型开路枝节的三阶低通滤波器，它具有更宽的阻
带特性.

关键词: SIR开路枝节, 集总元件等效模型, 谐振器, 低通滤波器

Abstract:

A novel two-order lowpass filter with a stepped impedance resonator (SIR) open-stub is proposed. The
filter improves performance of out-band rejection and cutoff frequency response by using an SIR open-stub, having
advantages of low loss, wide stop band and compact structure. The measured insertion loss in pass band is below
?0.3 dB and the rejection bandwidth at insertion loss greater than 15 dB is 9 GHz. The measured 3 dB cutoff
frequency of the two-order lowpass filter is 7.2 GHz in the pass band. It can be widely used in various microwave
systems. Circuit simulation results, EM simulation, and experimental results of the two-order lowpass filter are in
good agreement, showing feasibility of the lumped-element equivalent circuit. In order to broaden stop band and
suppress high order spurious signals, a three-order lowpass filter loaded with open SIR-stub and reverse T-stub is
also proposed.

Key words: SIR open-stub, lumped elements equivalent circuit, resonator, lowpass filter

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