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International Journal of Antennas and Propagation
Volume 2017, Article ID 4563571, 7 pages
https://doi.org/10.1155/2017/4563571
Research Article

Reconfigurable Antenna for Jamming Mitigation of Legacy GPS Receivers

1Department of Electrical and Electronics Engineering, Yeditepe University, 34755 Istanbul, Turkey
2Department of Electrical and Electronics Engineering, Ege University, 35100 Izmir, Turkey

Correspondence should be addressed to Korkut Yeğin; moc.liamg@knigey

Received 11 October 2016; Revised 26 February 2017; Accepted 23 March 2017; Published 30 April 2017

Academic Editor: Ikmo Park

Copyright © 2017 İsmail Şişman and Korkut Yeğin. 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

We propose a simple solution for jamming mitigation of L1 band GPS by electronically switching antenna beam for wide and narrow beamwidths. Assuming the jamming signal is directed from low elevation angles, antenna reception can be made significantly lower at these angles by electronically reconfiguring the antenna beamwidth. Four-element antenna array and one of the elements of the array are designated as antijam (array) mode and normal mode of the antenna. The antenna is placed on a degenerate-ground with symmetric slots in the ground. Front-end configuration for this antenna is also discussed. Simulations and measurements are performed to validate the proposed design. The antenna achieves more than 15 dB rejection in measurements and more than 20 dB cross-polarization improvement compared to standalone (normal mode) antenna. The system can easily be replaced with existing active antenna to improve antijam capability of the receiver.