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Physical limitations on antennas of arbitrary shape

In English

Författare

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.

Publiceringsår

2007

Språk

Engelska

Sidor

2589-2607

Publikation/Tidskrift/Serie

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

Volym

463

Issue

2086

Dokumenttyp

Artikel i tidskrift

Förlag

Royal Society Publishing

Ämne

  • Electrical Engineering, Electronic Engineering, Information Engineering

Status

Published

Projekt

  • EIT_HSWC:Antenna MIMO antennas and channels

Forskningsgrupp

  • Electromagnetic theory

ISBN/ISSN/Övrigt

  • ISSN: 1364-5021