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A RF Microstrip Balun Using a Wilkinson Divider and 3-dB Quadrature Couplers  

Park Ung-Hee (Radio Technology Group, Electronics and Telecommunications Research Institute)
Lim Jong-Sik (Division of Information Technology Engineering, SoonChunHyang University)
Kim Joung-Myoun (Radio Technology Group, Electronics and Telecommunications Research Institute)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.3, 2005 , pp. 246-252 More about this Journal
Abstract
A RF microstrip balun having low transmission loss for the balanced receiving dipole antenna is designed and fabricated using a three-section Wilkinson divider and two 3-dB quadrature couplers. It considers two types of the three-section Wilkinson dividers, the Cohn's optimum three-section structure and the miniaturized three-section structure, for wideband power splitting. Also, two 3-dB quadrature couplers for 180 degrees of phase difference adopt a twist-wire coaxial cable. The fabricated first balun having the Cohn's optimum three-section Wilkinson divider has 0.5 dB of transmission loss, $\pm$0.2 dB of amplitude imbalance, and 180$\pm$2.3 degrees of phase imbalance over 400 to 1000 MHz by measurement. The second one using the miniaturized three-section Wilkinson divider shows 1.0 dB of transmission loss, $\pm$0.7 dB of amplitude imbalance, and 180$\pm$8.8 degrees of phase imbalance over the same frequency band.
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