Quality factor for lossy and lossless antennas

Author

Yaghjian, A.D. ; Gustafsson, Mats ; Jonsson, B.L.G.

fYear

2014

fDate

6-11 April 2014

Firstpage

3123

Lastpage

3127

Abstract

Lower-bound formulas for the Q of electrically small antennas in an arbitrarily shaped volume are derived for combined electric and magnetic dipole moments 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 “highly dispersive lossy” 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.

Keywords

Q-factor; antenna theory; dipole antennas; losses; Q-factor; dipole antennas; electric dipole moments; electric surface currents; highly dispersive lossy material; lossless antenna; lossy antennas; lower-bound formulas; magnetic dipole moments; magnetic polarizabilities; magnetic surface currents; nondispersive-conductivity material; quality factor; quasistatic electric; Dipole antennas; Dispersion; Magnetic moments; Materials; Q-factor; antenna; dipoles; quality factor;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation (EuCAP), 2014 8th European Conference on

Conference_Location

The Hague

Type

conf

DOI

10.1109/EuCAP.2014.6902489

Filename

6902489