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Design of Dumbbell-type CPW Transmission Lines in Optoelectric Circuit PCBs for Improving Return Loss  

Lee, Jong-Hyuk (경희대학교 전자정보학부 무선통신회로연구실)
Kim, Hwe-Kyung (경희대학교 전자정보학부 무선통신회로연구실)
Im, Young-Min (경희대학교 전자정보학부 무선통신회로연구실)
Jang, Seung-Ho (경희대학교 전자정보학부 무선통신회로연구실)
Kim, Chang-Woo (경희대학교 전자정보학부 무선통신회로연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.4A, 2010 , pp. 408-416 More about this Journal
Abstract
A dumbbell-type CPW transmission-line structure has been proposed to improve the return loss of the transmission line between a driver IC and flip-chip-bonding VCSEL(Vertical Cavity Surface Emitting Laser) in a hybrid opto-electric circuit board(OECB). The proposed structure used a pair of dummy ground solder balls on the ground lines for flip-chip bonding of the VCSEL and designed the dumbbell-type CPW transmission line to improve reflection characteristics. The simulated results revealed that the return loss of the dumbbell-type CPW transmission line was 13-dB lower than the conventional CPW transmission line. A 4-dB improvement in the return loss was obtained using the dummy ground solder balls on the ground lines. The variation rate of the reflection characteristic with the variation of terminal impedances of the transmission line (at the output terminal of the driver IC and the input terminal of the VCSEL) is about ${\pm}2.5\;dB$.
Keywords
OECB; Dumbbell-type; CPW; Driver IC; VCSEL; Flip-Chip Bonding;
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