Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (6): 6-10.doi: 10.3969/j.issn.1000-565X.2013.06.002

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Design of Tri- Band Bandpass Filter Based on Double- Sided Parallel Stripline

Zhao Xiao- lan Wei Gang Zhang Xiu- yin Liu Pei- jie   

  1. School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2012-11-07 Revised:2013-01-18 Online:2013-06-25 Published:2013-05-03
  • Contact: 赵小兰(1974-)，女，博士生，讲师，主要从事无线技术与光通信技术研究 E-mail:gzxll@scut.edu.cn
  • About author:赵小兰(1974-)，女，博士生，讲师，主要从事无线技术与光通信技术研究
  • Supported by:

     NSFC- 广东省自然科学联合基金资助项目(U1035002);国家自然科学基金青年科学基金资助项目(61001055)

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Abstract:

 Proposed in this paper is a novel design method of tri- band bandpass filter (BPF) with compact structure,high skirt selectivity,individually- controlled passbands and simple circuit.The proposed filter,which is based on adouble- sided parallel stripline with an inserted conductor plane in the middle of the substrate,consists of tworesonators respectively located on the top and the bottom layers,which produce three passbands.The frequencies ofthe first and the third passbands are controlled by the stub- loaded stepped- impendence resonators on the top layer,while the frequency of the second passband is controlled by the half- wavelength resonators on the bottom layer.Moreover,transmission zeros are generated by employing a cross coupling structure for the top- layer resonator,thusimproving the skirt selectivity of the filter.Finally,a tri- band filter working at the frequencies of 2.38, 3.40 and5.15GHz is implemented and tested.The tested results accord well with the simulated ones,which means that theproposed design method is effective.

Key words: tri- band bandpass filter, bandpass filter, double- sided parallel stripline, resonator

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