Abstract—In this paper, a new approach to the design of a balun circuit is presented. The proposed balun is composed of an impedance-transforming directional coupler and an LH/RH transmission line differential phase shifter. The proposed solution features broadband amplitude and phase response, moreover, a flexibility of the impedance transformation from balanced to imbalanced port is obtained. The proposed concept has been verified by the design of a balun circuit featuring over-an-octave bandwidth and impedance transformation 70 bal. / 50 imbal.
Index Terms—Microwave baluns, directional couplers, coupled-line couplers.
The authors are with the Electronic Department, AGH University of Science and Technology, Av. Mickiewicza 30, 30-059 Krakow, Poland (Corresponding author: S. Gruszczynski; tel.: 0048-12-6173021; fax: 0048-12-633-23-98; e-mail: slawomir.gruszczynski@agh.edu.pl).
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Cite:J. Sorocki, I. Piekarz, K. Staszek, P. Kaminski, K. Wincza, and S. Gruszczynski, "Broadband Balun Circuits Composed of Impedance Transforming Directional Couplers and LH Transmission-Line Sections," International Journal of Information and Electronics Engineering vol. 6, no. 3, pp. 147-150, 2016.
