Title :
Physical Limitations on Scattering and Absorption of Antennas
Author :
Gustafsson, Mats ; Sohl, C. ; Kristensson, G.
Author_Institution :
Dept. of Electr. & Inf. Technol., Lund Univ., Lund, Sweden
Abstract :
In this paper, physical limitations are presented for antennas of arbitrary shape. Antenna properties such as bandwidth and directivity are shown to be bounded from above by the antenna volume and certain shape coefficients given by the eigenvalues of the high-contrast polarizability dyadic. The theoretical results are illustrated by a resonant loop antenna and an ultra-wideband (UWB) spiral antenna.
Keywords :
eigenvalues and eigenfunctions; electromagnetic wave absorption; electromagnetic wave scattering; loop antennas; spiral antennas; ultra wideband antennas; absorption crosssection; antenna bandwidth; antenna directivity; arbitrary-shaped antenna; eigenvalues; high-contrast polarizability dyadic; resonant loop antenna; scattering antenna; shape coefficient; ultra-wideband spiral antenna; dispersion relation; extinction cross section; optical theorem; physical limitations; ultrawideband;
Conference_Titel :
Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on
Conference_Location :
Edinburgh
Print_ISBN :
978-0-86341-842-6
