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International Journal of Antennas and Propagation
Volume 2015, Article ID 478453, 13 pages
http://dx.doi.org/10.1155/2015/478453
Research Article

Design Variations on Planar Differential Antenna with Potential for Multiple, Wide, and Narrow Band Coverage

1Tyndall National Institute, Lee Maltings, Dyke Parade, Cork, Ireland
2Department of Information Technology, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium
3Department of Electrical and Electronic Engineering, University College Cork, College Road, Cork, Ireland

Received 31 October 2014; Revised 19 January 2015; Accepted 22 January 2015

Academic Editor: Renato Cicchetti

Copyright © 2015 Domenico Pepe 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

This paper presents three practical antenna implementations based on variations of one general planar differential antenna topology originally proposed for ultrawideband (UWB) applications. All designs were implemented on a low-cost FR4 substrate and experimentally characterized in an anechoic chamber. The results show how the proposed design variations lead to the required antenna performances and how they give rise to new opportunities in terms of coverage of wide, narrow, and multiple frequency bands for communication and sensing applications below 5 GHz. In particular, the results show how a significant enhancement in bandwidth performance is achieved by folding the differential radiating elements. Moreover, they show how an agile design strategy enables adaption of the antenna design to different requirements for covering wide, narrow, and multiple bands, making the proposed class of antennas suitable for different wireless applications. In detail, the proposed class of antennas covers multiple frequency bands, ranging from the 868 MHz and 915 MHz bands to 2.4 GHz industrial scientific and medical (ISM) bands, including the 1.2 GHz L band for Global Positioning and Navigation Satellite Systems (GNSS) and the lower portion of the UWB band.