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International Journal of Antennas and Propagation
Volume 2013, Article ID 921859, 8 pages
Research Article

Design of an Ultra-Wideband Transition from Double-Sided Parallel Stripline to Coplanar Waveguide

School of Electrical Engineering and Computer Science, Kyungpook National University, Sankyuk-dong, Buk-gu, Daegu 702-701, Republic of Korea

Received 26 October 2012; Accepted 20 December 2012

Academic Editor: Tat Yeo

Copyright © 2013 Young-Gon Kim and Kang Wook Kim. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A design method of an ultra-wideband transition from double-sided parallel stripline (DSPSL) to coplanar waveguide (CPW) is proposed based on analytical expressions of characteristic impedance. The conformal mapping is used to obtain the characteristic impedance for each section of the transition within 3.7% accuracy as compared with the EM simulation results. An efficient and clear guideline for the design of the transition is proposed. The implemented transition performs less than 0.6 dB insertion loss per transition for frequencies from 40 MHz to 12 GHz and less than 1.2 dB insertion loss to 27 GHz, which well exceeds the previous results in the literature.