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International Journal of Antennas and Propagation
Volume 2014, Article ID 978258, 6 pages
http://dx.doi.org/10.1155/2014/978258
Research Article

Low-Power Optically Controlled Patch Antenna of Reconfigurable Beams

School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China

Received 22 June 2014; Accepted 14 August 2014; Published 28 August 2014

Academic Editor: J. S. Mandeep

Copyright © 2014 Deshuang Zhao 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 novel compact beam-reconfigurable patch antenna based on light control of no more than 30 mW optical powers is successfully demonstrated. It consists of one T-shape driven patch and one slot-etched parasitic patch. A silicon dice is employed as the photoconductive switch that is bridged across the slot center for optical control of reconfigurable beams. The antenna greatly reduces the total optical powers required for reconfigurable beams. Such design is based on the fact that the current phase change of the parasitic patch is sensitive to the conductivity of the silicon dice. A few conductivity changes of the silicon dice induced by the optical light can lead to a big phase change of the parasitic patch currents, eventually resulting in reconfigurable beams with low optical power requirement.