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International Journal of Antennas and Propagation
Volume 2010 (2010), Article ID 843624, 8 pages
http://dx.doi.org/10.1155/2010/843624
Application Article

Decoupling of Multifrequency Dipole Antenna Arrays for Microwave Imaging Applications

1Electrical and Electronic Engineering Department, Public University of Navarra, Campus Arrosadia, 31006 Pamplona, Spain
2Nanotechnology Research Center, Bilkent University, Bilkent, Ankara, 06800, Turkey
3Department of Physics, Koc University, Istanbul 34450, Turkey

Received 6 September 2009; Accepted 25 November 2009

Academic Editor: Hoi Shun Lui

Copyright © 2010 E. Saenz 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.

Abstract

The mutual coupling between elements of a multifrequency dipole antenna array is experimentally investigated by 𝑆 -parameter measurements and planar near-field scanning of the radiated field. A multifrequency array with six dipoles is analyzed. In order to reduce the coupling between dipoles, a planar metasurface is placed atop the array acting as superstrate. The mutual coupling of the antenna elements in the absence and presence of the superstrate is presented comparatively. Between 3 and 20 dB mutual coupling reduction is achieved when the superstrate is used. By scanning the field radiated by the antennas and far-field measurements of the radiation pattern, it is observed that the superstrate confines the radiated power, increases the boresight radiation, and reduces the endfire radiation.