华南理工大学学报(自然科学版) ›› 2012, Vol. 40 ›› Issue (6): 11-15,21.

• 电子、通信与自动控制 • 上一篇    下一篇

源-负载耦合发夹梳双频带通滤波器的设计

褚庆昕1 欧阳霄1,2 黎志辉1   

  1. 1.华南理工大学 电子与信息学院,广东 广州 510640; 2.空间微波技术国防科技重点实验室,陕西 西安 710100
  • 收稿日期:2011-12-13 修回日期:2012-03-18 出版日期:2012-06-25 发布日期:2012-05-03
  • 通信作者: 褚庆昕(1958-) ,男,教授,博士生导师,主要从事射频电路及天线研究. E-mail:qxchu@ scut.edu.cn
  • 作者简介:褚庆昕(1958-) ,男,教授,博士生导师,主要从事射频电路及天线研究.
  • 基金资助:

    国家自然科学基金资助项目( 61171029) ; 重点实验室基金资助项目( 9140C5306021008)

Design of Hairpin-Comb Dual-Band Bandpass Filter with Source-Load Coupling

Chu Qing-xinOuyang Xiao1,2  Li Zhi-hui1   

  1. 1. School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China; 2. National Key Laboratory of Science and Technology on Space Microwave Technology,Xi’an 710100,Shaanxi,China
  • Received:2011-12-13 Revised:2012-03-18 Online:2012-06-25 Published:2012-05-03
  • Contact: 褚庆昕(1958-) ,男,教授,博士生导师,主要从事射频电路及天线研究. E-mail:qxchu@ scut.edu.cn
  • About author:褚庆昕(1958-) ,男,教授,博士生导师,主要从事射频电路及天线研究.
  • Supported by:

    国家自然科学基金资助项目( 61171029) ; 重点实验室基金资助项目( 9140C5306021008)

摘要: 为得到具有高选择性、小尺寸、低成本的双频带通滤波器,提出了一种具有准椭圆函数响应的双频带通滤波器设计方法.该滤波器利用两组工作于不同工作频率的发夹梳型谐振器,因此能够提供足够的自由度去设计两个独立可控的通带. 谐振单元之间的混合电磁耦合可以产生可控的传输零点,而源-负载耦合同样能够在通带外产生传输零点,因此混合电磁耦合与源- 负载耦合的结合使阻带内具有多个传输零点,可以有效地提高滤波器的选择性和抑制阻带.最后设计加工了一个工作在2. 4 和5. 2 GHz 的双频带通滤波器,测量结果与仿真结果吻合良好,验证了该设计方法的有效性.

关键词: 带通滤波器, 双频, 发夹梳型谐振器, 混合电磁耦合, 源-负载耦合

Abstract:

In order to develop dual-band bandpass filters with high selectivity,small size and low cost,a novel method to design the filter with quasi-elliptic response is presented. In this method,two sets of hairpin-comb resonators working at different frequencies are utilized,which provides enough freedom for the independent control of two passbands. The mixed electromagnetic coupling of hiarpin-comb resonators can generate a controllable out-ofband transmission zero,and the source-load coupling can also introduce additional transsmission zeros in the stopband. Therefore,the selectivity and the stopband-restricting ability of the filter are both improved by the transmission zeros caused as much as possible by the combination of these two couplings. A dual-band bandpass filter operating at 2.4 and 5.2GHz is finally designed and fabricated,and the measured results accord well with the simulated ones,which means that the proposed design method is effective.

Key words: bandpass filter, dual band, hairpin-comb resonator, mixed electromagnetic coupling, source-load coupling

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