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A Size-Reduced CPW Balun with the Wilkinson Divider Structure Using a Crossing Structure  

Lim Jong-Sik (Division of Information Technology Engineering, Soonchunhyang University)
Yang Hoe-Sung (Electronics and Telecommunications Research Institute)
Kim Dong-Joo (Ace Technology Inc)
Jeong Yong-Chae (Division of Electronics and Information Engineering, Chonbuk National University)
Ahn Dal (Division of Information Technology Engineering, Soonchunhyang University)
Kim Kwang-Soo (Daegu Gyeongbuk Institute of Science & Technology)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.8, 2005 , pp. 835-841 More about this Journal
Abstract
In this paper, a novel sized-reduced CPW(Coplanar Waveguide) balun is proposed. It has a crossing structure between signal line and ground planes of CPW transmission line for the $180^{\circ}$ phase inversion. The$3{\lambda}/4$ CPW transmission line is reduced to ${\lambda}/4$ in physical length while the electrical length is preserved to $270^{\circ}$ by the $180^{\circ}$ phase inverting structure, while the previous balun by Lim et at. has a long $3{\lambda}/4$ transmission section to from the Wilkinson divider structure having out of phase between output ports. In addition, the measured data which show the crossing structure has the wanted $180^{\circ}$ phase change is presented in this work.
Keywords
Wilkinson Divider; Balun; CPW;
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