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Physical limitations on antennas of arbitrary shape

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Author

Summary, in English

In this paper, physical limitations on bandwidth, realized gain, Q-factor and directivity are derived for antennas of arbitrary shape. The product of bandwidth and realizable gain is shown to be bounded from above by the eigenvalues of the long-wavelength, high-contrast polarizability dyadics. These dyadics are proportional to the antenna volume and are easily determined for an arbitrary geometry. Ellipsoidal antenna volumes are analysed in detail, and numerical results for some generic geometries are presented. The theory is verified against the classical Chu limitations for spherical geometries and shown to yield sharper bounds for the ratio of the directivity and the Q-factor for non-spherical geometries.

Publishing year

2007

Language

English

Pages

2589-2607

Publication/Series

Royal Society of London. Proceedings A. Mathematical, Physical and Engineering Sciences

Volume

463

Issue

2086

Document type

Journal article

Publisher

Royal Society Publishing

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Status

Published

Project

  • EIT_HSWC:Antenna MIMO antennas and channels

Research group

  • Electromagnetic theory

ISBN/ISSN/Other

  • ISSN: 1364-5021