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International Journal of Antennas and Propagation
Volume 2014 (2014), Article ID 961818, 7 pages
http://dx.doi.org/10.1155/2014/961818
Research Article

Optimization of the UWB Feed Antenna Position in Reflector Applications

Department of Electronics and Communications Engineering, Yildiz Technical University, Esenler, 34220 Istanbul, Turkey

Received 21 October 2013; Accepted 11 February 2014; Published 17 March 2014

Academic Editor: Ahmed A. Kishk

Copyright © 2014 Nurhan Türker Tokan. 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

In reflector system design, achieving high stability of phase center position with changes in frequency in reflector feed antennas is highly desired. However, obtaining highly stable phase center is not possible for UWB feed antennas, specially for planar ones. Thus, an optimum positioning for the UWB feed antenna should be defined. Optimization of the positioning of the feed antenna is essential since this process lowers resulting phase error losses significantly. In this work, a novel method for optimizing the UWB feed position of a prime focus reflector antenna from phase and amplitude recordings of the measured radiated field is introduced. An automatic and fast design procedure, based on Genetic Algorithms, is described. The proposed methodology has been numerically and experimentally assessed. The procedure is introduced by an application example to one of the most commonly used UWB feed antennas in high-performance reflector antenna systems: Linear Tapered Slot Antenna (LTSA). A LTSA antenna operating in 6–25 GHz frequency band is designed and manufactured. The performance of the method is quantified in terms of its phase error losses in E- and H-planes for reflector illumination.