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Journal of Electromagnetic Waves and Applications Volume 26, 2012 - Issue 11-12
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Articles

Compact microstrip line directional coupler with high directivity

Y. Zhu Key Laboratory of Satellite Communication, Institute of Communication Engineering, PLA University of Science and Technology, Nanjing, 210007, ChinaCorrespondence[email protected]
,
J. Zhang Key Laboratory of Satellite Communication, Institute of Communication Engineering, PLA University of Science and Technology, Nanjing, 210007, China
,
H. Zhu Key Laboratory of Satellite Communication, Institute of Communication Engineering, PLA University of Science and Technology, Nanjing, 210007, China
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J. Cheng Key Laboratory of Satellite Communication, Institute of Communication Engineering, PLA University of Science and Technology, Nanjing, 210007, China
&
J. Li Ministerial Key Laboratory of JGMT, Nanjing University of Science and Technology, Nanjing, 210094, China
Pages 1619-1623 | Received 10 May 2012, Accepted 14 Jun 2012, Published online: 19 Jul 2012
 
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Abstract

A compact directional coupler with high directivity is presented. The coupling passbands characteristics of the multisections coupler which cascades two coupled lines via transmission line are analyzed. In addition, asymmetric coupled line and stepped impedance matching method are used to generate the isolation zero. A 2.45 GHz coupler is designed and implemented. The 3 dB bandwidth of the coupling is from 1.2 to 3.55 GHz with the corresponding fractional bandwidth (FBW) of 98%, and the directivity is better than 20 dB from 0.5 to 3.5 GHz. The proposed coupler presents small size and excellent directivity compared with the traditional parallel coupled line coupler.

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