Design Studies of Ultra-Wideband Microstrip Antennas with a Small Capacitive Feed

Kasabegoudar, Veeresh G.; Upadhyay, Dibyant S.; Vinoy, K. J.

doi:https://doi.org/10.1155/2007/67503

International Journal of Antennas and Propagation

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Research Article | Open Access

Volume 2007 | Article ID 067503 | https://doi.org/10.1155/2007/67503

Design Studies of Ultra-Wideband Microstrip Antennas with a Small Capacitive Feed

Veeresh G. Kasabegoudar,¹Dibyant S. Upadhyay,¹and K. J. Vinoy¹

Academic Editor: James Becker

Received29 May 2007

Accepted10 Oct 2007

Published06 Dec 2007

Abstract

The design of an ultra-wideband microstrip patch antenna with a small coplanar capacitive feed strip is presented. The proposed rectangular patch antenna provides an impedance bandwidth of nearly 50%, and has stable radiation patterns for almost all frequencies in the operational band. Results presented here show that such wide bandwidths are also possible for triangular and semiellipse geometries with a similar feed arrangement. The proposed feed is a very small strip placed very close to the radiator on a substrate above the ground plane. Shape of the feed strip can also be different, so long as the area is not changed. Experimental results agree with the simulated results. Effects of key design parameters such as the air gap between the substrate and the ground plane, the distance between radiator patch and feed strip, and the dimensions of the feed strip on the input characteristics of the antenna have been investigated and discussed. As demonstrated here, the proposed antenna can be redesigned for any frequency in the L-, S-, C-, or X-band. A design criterion for the air gap has been empirically obtained to enable maximum antenna bandwidth for all these operational frequencies.

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Copyright

Copyright © 2007 Veeresh G. Kasabegoudar 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.

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