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Ultra Wideband CPW Baluns Having Multistage Wilkinson Structure  

Lim Jong-Sik (Division of Information Technology Engineering, Soonchunhyang University)
Park Ung-Hee (Department of Electronics, Kangwon National University)
Jeong Yong-Chae (Division of Electronics and Information Engineering, Chonbuk National University)
Ahn Dal (Division of Information Technology Engineering, Soonchunhyang University)
Oh Seong-Min (Division of Information Technology Engineering, Soonchunhyang University)
Koo Jae-Jin (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.17, no.9, 2006 , pp. 811-820 More about this Journal
Abstract
Ultra wideband CPW batons are proposed in this paper. The proposed talons are consisted of ultra wideband multi-stage Wilkinson dividers and 'X'-shaped $180^{\circ}$ out-of-phase generator. Bottom-bridges and via-holes are used to connect CPW ground lines instead of the conventional air-bridges which require troublesome manual working in fabrication with HMIC(Hybrid Microwave Integrated Circuits) substrates. The proposed CPW batons have ultra wideband of 3 or $10(=F_{figh}/F_{low})$ theoretically, the wideband characteristics and S-parameters of the basis Wilkinson divider are directly converted to those of the proposed batons. The proposed batons are so compact and small compared to the conventional Wilkinson batons because no additional area for out-of-phase section is required. So the size of the proposed batons is exactly the same as that of the basis Wilkinson dividers. As examples, 3-stage and 7-stage wideband Wilkinson dividers are converted to the proposed batons. Their measured operating bandwidth are $1\sim3GHz$ and $0.8\sim5GHz$, respectively, with excellent matching, isolation and power division performances. The measured magnitude and phase balance errors are ${\pm}0.5dB\;and\;0.45\;dB,\;and\;{\pm}5^{\circ}\;and\;{\pm}10^{\circ}C$ over $1\sim3GHz\;and\;0.8\sim5GHz$, respectively.
Keywords
Wilkinson Structure; Balun; CPW; Ultra Wideband;
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