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International Journal of Antennas and Propagation
Volume 2015, Article ID 236136, 9 pages
http://dx.doi.org/10.1155/2015/236136
Research Article

Metamaterial Inspired Microstrip Antenna Investigations Using Metascreens

1Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad 44000, Pakistan
2National Institute of Lasers and Optronics (NILOP), Islamabad 44000, Pakistan

Received 15 October 2014; Revised 10 February 2015; Accepted 11 February 2015

Academic Editor: Hui Feng Ma

Copyright © 2015 Muhammad Tauseef Asim and Mushtaq Ahmed. 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 dual layer periodically patterned metamaterial inspired antenna on a low cost FR4 substrate is designed, simulated, fabricated, and tested. The eigenmode dispersion simulations are performed indicating the left handed metamaterial characteristics and are tunable with substrate permittivity. The same metamaterial unit cell structure is utilized to fabricate a metascreen. This metascreen is applied below the proposed metamaterial antenna and next used as superstrate above a simple patch to study the effects on impedance bandwidth, gain, and radiation patterns. The experimental results of these antennas are very good and closely match with the simulations. More importantly, the resonance for the proposed metamaterial antenna with metascreen occurs at the left handed (LH) eigenfrequency of the metamaterial unit cell structure. The measured −10 dB bandwidths are 14.56% and 22.86% for the metamaterial antenna with single and double metascreens, respectively. The metascreens over the simple patch show adjacent dual band response. The first and second bands have measured −10 dB bandwidths of 9.6% and 16.66%. The simulated peak gain and radiation efficiency are 1.83 dBi and 74%, respectively. The radiation patterns are also very good and could be useful in the UWB wireless applications.