Table of Contents
ISRN Communications and Networking
Volume 2014, Article ID 154518, 10 pages
http://dx.doi.org/10.1155/2014/154518
Research Article

Design of an Aperture-Coupled Frequency-Reconfigurable Microstrip Stacked Array Antenna for LTE and WiMAX Applications

1Antenna Research Group (ARG), Microwave Technology Centre (MTC), Faculty of Electrical Engineering (FKE), Universiti Teknologi Mara (UiTM), 40450 Shah Alam, Selangor, Malaysia
2Institute of Space Science (ANGKASA), Level 2, Faculty of Engineering and Built Environment Building, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor, Malaysia

Received 14 January 2014; Accepted 30 March 2014; Published 1 June 2014

Academic Editors: S. K. Goudos and S. Rapuano

Copyright © 2014 N. Ramli 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

The aim of this paper is to design a novel structure of a frequency-reconfigurable microstrip array antenna by using a combination of aperture-coupled and the stacked patch technology. The four sets of two different aperture slot shapes (I-shaped and H-shaped) are printed on the ground and are functional to transfer the wave and the signal to the selected radiating layers. Both aperture slot positions are based on the bottom patches (layer 2) and top patches (layer 1), respectively. To achieve the frequency reconfigurability, four PIN diode switches are integrated on the feed line layer positioned between both aperture slots on the ground. The activation of the selected patches will determine the current operating frequency of the proposed antenna. A 2.6 GHz or 3.5 GHz frequency is achieved by switching all the PIN diode switches to ON or OFF mode synchronously. The advantage of the proposed antenna is that it can minimize the usage of the antenna’s surface area, with different size of the patch having different operating frequencies, sorted in different layer. The measured results of the return losses, radiation patterns, and the practical indoor propagation measurement achieved good agreement with the simulated results.