NDLI: Theory of plasma antenna windowing

Content Provider	IEEE Xplore Digital Library
Author	Anderson, T. Alexeff, I.
Copyright Year	2004
Description	Author affiliation: Tennessee Univ., Knoxville, TN, USA (Anderson, T.; Alexeff, I.)
Abstract	Summary form only given. This paper sets forth a detailed numerical analysis of the performance of a reconfigurable antenna comprised of a linear omni-directional antenna surrounded by a cylindrical shell of conducting plasma. The plasma shield consists of a series of tubes containing a gas, which upon electrification, forms a plasma (in practice fluorescent light bulbs are used). The plasma is highly conducting and acts as a reflector for radiation for frequencies below the plasma frequency. Thus when all of the tubes surrounding the antenna are electrified, the radiation is trapped inside. By leaving one or more of the tubes in a non-electrified state, apertures are formed in the plasma shield which allow radiation to escape. This is the essence of the plasma window based reconfigurable antenna. The apertures can be closed or opened rapidly (on micro-second time scales) simply by applying voltages. The goal of the theoretical analysis is the prediction of the far-field radiation pattern of the plasma window antenna (PWA) for a given configuration. In order to simplify the analysis we make the approximation that the length of the antenna and surrounding plasma tubes are irrelevant to the analysis. Physically we assume that the tubes are sufficiently long so that end effects and be ignored. In so doing, the problem becomes two-dimensional and as such allows for an exact solution. The problem is therefore posed as follows:(1) assume a wire (the antenna) is located at the origin and carries a sinusoidal current of some specified frequency and amplitude.(2) Next assume that the wire is surrounded by a collection of cylindrical conductors each of the same radius and distance from the origin.(3) Solve for the field distribution everywhere in space and thus obtain the radiation pattern.
Sponsorship	Plasma Sci. and Applications Committee of the IEEE Nuclear and Plasma Sci. Soc
File Size	65997
File Format	PDF
ISBN	0780383346
ISSN	07309244
DOI	10.1109/PLASMA.2004.1340030
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-07-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Plasmas Antenna theory Frequency Apertures Antenna radiation patterns Wire Numerical analysis Fluorescence Voltage Pattern analysis
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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