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International Journal of Antennas and Propagation
Volume 2015, Article ID 523198, 10 pages
http://dx.doi.org/10.1155/2015/523198
Research Article

Capacitively Loaded Loop-Based Antennas with Reconfigurable Radiation Patterns

1IETR, University of Rennes 1, Campus Beaulieu, Bât. 11D, No. 263, avenue Général Leclerc, CS 74205, 35042 Rennes Cedex, France
2Electrical and Computer Engineering Department, King Abdulaziz University, P.O. Box 80204, Jeddah 21589, Saudi Arabia
3IETR, INSA, 20 avenue Buttes de Coësmes, 35043 Rennes, France
4Innov’Com Laboratory, SUPCOM, University of Carthage, Tunis, Tunisia
5Department of Electrical and Computer Engineering, University of Arizona, Tucson, AZ, USA

Received 23 January 2015; Revised 31 March 2015; Accepted 31 March 2015

Academic Editor: Vincenzo Galdi

Copyright © 2015 Saber Dakhli 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

A class of metamaterial-inspired antennas having reconfigurable radiation patterns is proposed. They consist of a driven monopole antenna with one- and two-capacitively loaded loop (CLL), near field resonant parasitic elements. Two configurations are studied by considering the state of these CLL elements as being either open or closed configurations. Simulation results explain the design features and demonstrate that the structure can change its beam direction simply by controlling the switched states. Two prototypes with one- and two-CLL elements were fabricated and tested. The measured impedance mismatch and radiation pattern results are presented and compared to the corresponding simulated values.