skip navigation

LIBRARY

Abstract Database

Register for Latest Research

Stay Informed
Register with NCJRS to receive NCJRS's biweekly e-newsletter JUSTINFO and additional periodic emails from NCJRS and the NCJRS federal sponsors that highlight the latest research published or sponsored by the Office of Justice Programs.

NCJRS Abstract

To download this abstract, check the box next to the NCJ number then click the "Back To Search Results" link. Then, click the "Download" button on the Search Results page. Also see the Obtain Documents page for direction on how to access resources online, via mail, through interlibrary loans, or in a local library.

 

NCJ Number: 249346 Find in a Library
Title: Beam-Steering Reconfigurable Antenna for WLAN Applications
Journal: IIEEE Transactions on Antennas and Propagation  Volume:63  Issue:1  Dated:January 2015  Pages:24-32
Author(s): Li Zhouyuan; E. Ahmed; A.M. Eltawil; B.A. Cetiner
Date Published: January 2015
Page Count: 9
Sponsoring Agency: National Institute of Justice (NIJ)
Washington, DC 20531
Grant Number: 2009-SQ-B9-K005
Document: HTML
Type: Program/Project Description; Report (Grant Sponsored); Report (Technical)
Format: Article; Document (Online)
Language: English
Country: United States of America
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)
Main Term(s): Police equipment
Index Term(s): Antennas; NIJ grant-related documents; Police telecommunications systems; Specifications; Technology transfer
To cite this abstract, use the following link:
http://www.ncjrs.gov/App/publications/abstract.aspx?ID=271490

*A link to the full-text document is provided whenever possible. For documents not available online, a link to the publisher's website is provided. Tell us how you use the NCJRS Library and Abstracts Database - send us your feedback.