U.S. flag

An official website of the United States government, Department of Justice.

Dot gov

The .gov means it’s official.
Federal government websites always use a .gov or .mil domain. Before sharing sensitive information online, make sure you’re on a .gov or .mil site by inspecting your browser’s address (or “location”) bar.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Beam-Steering Reconfigurable Antenna for WLAN Applications

NCJ Number
249346
Date Published
Author(s)
Li Zhouyuan, E. Ahmed, A.M. Eltawil, B.A. Cetiner
Annotation
This article describes the features of a multifunctional reconfigurable antenna (MRA) capable of operating in nine modes corresponding to nine steerable beam directions in the semisphere space ({-30‹,0‹, 30‹}; ƒÓ ¸ {0‹, 45‹, 90‹, 135‹}).
Abstract
The MRA consists of an aperture-coupled driven patch antenna with a parasitic layer placed above it. The surface of the parasitic layer has a grid of 3 ~ 3 electrically small, square-shaped metallic pixels. The adjacent pixels are connected by PIN diode switches with ON/OFF status to change the geometry of the parasitic surface, which in turn changes the current distribution on the antenna, thus providing reconfigurability in beam steering direction. The MRA operates in the IEEE 802.11 frequency band (2.4-2.5 GHz) in each mode of operation. The antenna has been fabricated and measured. The measured and simulated impedance and radiation pattern results agree well indicating an average of ~ 6.5 dB realized gain in all modes of operation. System-level experimental performance evaluations have also been performed, where an MRA-equipped WLAN platform was tested and characterized in typical indoor environments. The results confirm that the MRA-equipped WLAN systems could achieve an average of 6 dB Signal to Noise Ratio (SNR) gain compared to legacy omni-directional antenna-equipped systems with minimal training overhead. (Publisher abstract modified)
Date Created: July 13, 2016