Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (6): 7-10.doi: 10.3969/j.issn.1000-565X.2010.06.002

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

Design of Compact Dual-Band Bandpass Filter

Chu Qing-xin  Ye Liang-hua  Chen Fu-chang   

  1. School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2009-07-01 Revised:2009-07-16 Online:2010-06-25 Published:2010-06-25
  • Contact: 褚庆昕（1958-），男，教授，博士生导师，主要从事射频电路与天线研究． E-mail:qxchu@scut．edu．cn
  • About author:褚庆昕（1958-），男，教授，博士生导师，主要从事射频电路与天线研究．
  • Supported by:

    国家自然科学基金重点项目（U0635004）; 广东省自然科学基金资助项目（60571056）

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Abstract:

Proposed in this paper is a compact dual-band filter based on the combined resonators,in which the two central passband frequencies and bandwidths are all tunable.The filter is composed of two sets of l/4 microstrip resonators that produce two different passbands.By adjusting the coupled spacing between the adjacent resonators in each set,the bandwidth for either the lower or the upper passband can be independently adjusted.Moreover,a dual-band filter operating at 2.4 and 5.2GHz is designed and manufactured.The measurement results basically accord with the simulation ones,which validates the effectiveness of the proposed design.

Key words: dual-band filters, bandpass filters, compact filter, l/4 microstrip resonator, microstrip