Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (5): 51-54,70.doi: 10.3969/j.issn.1000-565X.2010.05.010

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

Dual-Band Broadband Coupler with SIR Branches

Chu Qing-xin  Yang Lin  Lin Feng   

  1. School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2009-03-26 Revised:2009-10-31 Online:2010-05-25 Published:2010-05-25
  • Contact: 褚庆昕（1958-），男，博士，教授，主要从事射频器件与电路的理论与技术、计算通信电磁学及现代通信天线研究． E-mail:qxchu@scut．edu．cn
  • About author:褚庆昕（1958-），男，博士，教授，主要从事射频器件与电路的理论与技术、计算通信电磁学及现代通信天线研究．
  • Supported by:

    国家自然科学基金资助项目（U0635004） 国家自然科学青年基金资助项目（60801033）

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Abstract:

As the conventional dual-band coupler is of narrow operation band,this paper presents a novel design method of dual-band broadband branch-line coupler based on stepped impedance resonator（SIR）.With this method,both the location of resonate frequencies and the bandwidth of the coupler can be adjusted in the lower and upper frequency bands.A dual-band broadband 3-dB coupler operating at 2.20/5.50GHz is also designed and fabricated,which covers not only the 1.80GHz GSM band and but also the 2.45/5.25/5.80GHz WLAN bands.The measured results accord well with the simulated ones,meaning that the proposed design method is feasible.

Key words: branch-line coupler, stepped impedance resonator, dual band, broadband