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International Journal of Antennas and Propagation
Volume 2014, Article ID 378527, 6 pages
Research Article

A Broadband and High Gain Tapered Slot Antenna for W-Band Imaging Array Applications

The School of Electronics Engineering, Kyungpook National University, Sankyuk-dong, Buk-gu, Daegu 702-701, Republic of Korea

Received 29 July 2014; Accepted 5 October 2014; Published 23 November 2014

Academic Editor: Dau-Chyrh Chang

Copyright © 2014 Dong Sik Woo et al. 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 broadband and high gain tapered slot antenna (TSA) by utilizing a broadband microstrip- (MS-) to-coplanar stripline (CPS) balun has been developed for millimeter-wave imaging systems and sensors. This antenna exhibits ultrawideband performance for frequency ranges from 70 to over 110 GHz with the high antenna gain, low sidelobe levels, and narrow beamwidth. The validity of this antenna as imaging arrays is also demonstrated by analyzing mutual couplings and 4-element linear array. This antenna can be applied to mm-wave phased array, imaging array for plasma diagnostics applications.