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International Journal of Antennas and Propagation
Volume 2015 (2015), Article ID 815751, 8 pages
http://dx.doi.org/10.1155/2015/815751
Research Article

A Dual Band Patch Antenna with a Pinwheel-Shaped Slots EBG Substrate

1East China Jiaotong University, Nanchang 330013, China
2Zhong Tian Broadband Technology Co., Ltd., Nantong 226000, China

Received 29 May 2015; Revised 6 August 2015; Accepted 11 August 2015

Academic Editor: Maria E. De Cos

Copyright © 2015 Xiaoyan Zhang 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 dual band microstrip patch antenna integrated with pinwheel-shaped electromagnetic band-gap (EBG) structures is proposed. The patch antenna consists of a pair of spiral slots on the patch and is fed by using coaxial line. Its full-wave simulation predicts dual bands from 4.43 GHz to 4.56 GHz and from 4.96 GHz to 5.1 GHz in the C-band. The designed EBG with eight pinwheel-shaped slots addresses smaller frequency drift compared with the traditional square mushroom-like EBG when applied to the patch antenna. With the help of designed EBG structure, the impedance bandwidth, radiation efficiency, and gain of the patch antenna are improved significantly. The 10 dB impedance bandwidth is extended by 3.4% and 6.5% at the low- and high-frequency bands, respectively. The radiation efficiency is increased by 5% and 17.8%, and the realized gain is enhanced by 1.87 dB and 1.56 dB at 4.57 GHz and 5.06 GHz, respectively. The designed EBG structure may have many applications in other types of planar antennas.