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International Journal of Antennas and Propagation
Volume 2017 (2017), Article ID 6145865, 6 pages
Research Article

A Broadband Left-Handed Metamaterial Microstrip Antenna with Double-Fractal Layers

Faculty of Electronics, Military University of Technology, Warsaw, Poland

Correspondence should be addressed to Roman Kubacki

Received 18 January 2017; Revised 11 March 2017; Accepted 6 April 2017; Published 7 May 2017

Academic Editor: Ariel Epstein

Copyright © 2017 Roman Kubacki 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.


This paper proposes a microstrip patch antenna based on the left-handed metamaterial concept, using planar periodic geometry, which results in improved characteristics. This periodic geometry is derived from fractal shapes, which have been widely used in antenna engineering. The metamaterial property was obtained as a result of the double-fractal structure on both the upper and the bottom sides of the antenna. The final structure has been optimized to enhance bandwidth, gain, and radiation characteristics of the microstrip antenna. This combination significantly improved antenna performance; our design could support an ultrawide bandwidth ranging from 4.1 to 19.4 GHz, demonstrating higher gain with an average value of 6 dBi over the frequency range and a peak of 10.9 dBi and a radiation capability directed in the horizontal plane of the antenna.