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Minimum Q for Lossy and Lossless Electrically Small Dipole Antennas

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Author

Summary, in English

General expressions for the quality factor (Q) of antennas are minimized to obtain lower-bound formulas for the Q of electrically small, lossy or lossless, combined electric and magnetic dipole antennas confined to an arbitrarily shaped volume. The lower-bound formulas for Q are derived for the dipole antennas excited by both electric and magnetic surface currents as well as by electric surface currents alone. With either excitation, separate formulas are found for the dipole antennas containing only lossless or nondispersive-conductivity material and for the dipole antennas containing highly dispersiveconductivity material. The formulas involve the quasi-static electric and magnetic polarizabilities of the associated perfectly conducting volume of the antenna, the ratio of the powers radiated by the electric and magnetic dipoles, and the efficiency of the antenna.

Publishing year

2013

Language

English

Pages

641-673

Publication/Series

Progress in Electromagnetics Research-Pier

Volume

143

Document type

Journal article

Publisher

EMW Publishing

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • Minimum Q
  • Antennas
  • Electrically Small

Status

Published

Research group

  • Electromagnetic theory

ISBN/ISSN/Other

  • ISSN: 1070-4698