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http://dx.doi.org/10.5515/KJKIEES.2011.22.6.598

Miniaturization of Branch Line Coupler with Connected Coupled Lines  

Rhee, Seung-Yeop (Dept. of Electronic Communication Engineering, Chonnam University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.22, no.6, 2011 , pp. 598-604 More about this Journal
Abstract
A method of miniaturizing branch line coupler with connected coupled lines is presented. The quarter-wavelength transmission lines in the typical microstrip branch line coupler are replaced with the connected coupled lines with same characteristics of ones for compact size. The connected coupled line is analyzed by T-equivalent circuit and Z parameters based on the even-odd mode analysis. The proposed branch line couplers with connected coupled line are designed and fabricated on FR4 substrate at 2.4 GHz. The measured results show good agreement with theoretical prediction. And the experimental results show that the size of coupler is 37 precent smaller than conventional coupler. This minimized coupler is suitable for Butler Matrix as feeder for mobile communication beam forming antenna.
Keywords
Branch Line Coupler; Coupled Line; T Equivalent Circuit;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 IE3D manual, Zealand software
2 M. C. Scardelletti, G. E. Ponchak, and T. M. Weller, "Miniaturized Wilkinson power dividers utilizing capacitive loading", IEEE Microw. Wireless Compon. Lett., vol. 12, no. 1, pp. 6-8, Jan. 2002.   DOI
3 W. S. Tung, H. H. Wu, and Y. C. Chiang, "Design of microwave wideband quadrature hybrid using planar transformer coupling method", IEEE Trans. Microw. Theory Tech., vol. 51, no. 7, pp. 1852-1856, Jul. 2003.   DOI
4 Ching Wen Tang, Ming Guang Chen, and Chih-Hung Tsai, "Miniaturization of microstrip branchline coupler with dual transmission lines", IEEE Microw. Wireless Compon. Lett., vol. 18, no. 3, pp. 185-187, Mar. 2008.   DOI
5 Young-Hoon Chun, Jia-Sheng Hong, "Compact wide band branch line hybrids", IEEE Trans. Microwave Theory Tech., vol. 54, no. 2, pp. 704-709, Feb. 2006.   DOI
6 Abdel Fattah Sheta, Ashraf Mohra, and Samir F. Mahmoud, "A new class of miniature quadrature couplers for MIC and MMIC applications", Microwave and Optical Technology Letters, vol. 34, no. 3, pp. 215-219, Aug. 2002.   DOI
7 M. Nosrati, B. Virdee, "Realization of a compact branch-line coupler using quasi-fractal loaded coupled transmission lines", Progress In Electromagnetics Research C, vol. 13, pp. 33-40, 2010.   DOI
8 이홍섭, 황희용, "개방 스터브를 갖는 평행 결합선로의 해석과 브랜치 라인 하이브리드에의 응용", 한국전자파학회논문지, 19(1), pp. 40-45, 2008년 1월.
9 V. K. Tripathi, H. B. Lunden, and J. P. Starski, "Analysis and design of branch line hybrids with coupled lines", IEEE Trans. Microw. Theory Tech., vol. 32, no. 4, pp. 427-432, Apr. 1984.   DOI
10 David M. Pozar, Microwave Engineering, 2nd Edition, John Wiley & Sons, Inc., 1998.
11 M. Kirschning, R. H. Jansen, "Accurate wide-range design equations for the frequency-dependent characteristic of parallel coupled microstrip lines", IEEE Trans. Microwave Theory Tech., vol. 32, no. 1, pp. 83-90. Jan. 1984.   DOI
12 R. Comitangelo, D. Minervini, and B. Piovano, "Beam forming networks of optimum size and compactness for multibeam antennas at 900 MHz", in IEEE Antennas Propag. Soc. Symp. Dig., pp 2127-2130, 1997.