DocumentCode
1303628
Title
Polarization, Gain, and Q for Small Antennas
Author
Thal, Herbert L., Jr.
Author_Institution
Consulting Engineer, Wayne, United States
Volume
59
Issue
12
fYear
2011
Firstpage
4844
Lastpage
4848
Abstract
The six lowest-order modes that can be excited by a small antenna can be combined to produce patterns with a variety of polarization, gain, and Q characteristics. Tables and equations are presented to define bounds on the performance of these antennas for spherical and hemispherical volumes, including the effects of both external and internal energy. The impact of dielectric and magnetic material on the TM and TE modes is detailed, and it is shown that a thin shell of high-μ material allows the Q of both modes to approach the Chu bound.
Keywords
antenna radiation patterns; antenna theory; dielectric materials; magnetic materials; polarisation; Chu bound; Q characteristics; TE modes; TM modes; dielectric material; gain pattern; hemispherical volumes; high-μ material; magnetic material; polarization pattern; six lowest-order modes; small antennas; Antenna theory; Coupled mode analysis; Dielectric materials; Dipole antennas; Gain; Magnetic cores; Magnetic materials; Q factor; Antenna theory; Q factor; coupled-mode analysis; electrically-small antennas;
fLanguage
English
Journal_Title
Antennas and Propagation, IEEE Transactions on
Publisher
ieee
ISSN
0018-926X
Type
jour
DOI
10.1109/TAP.2011.2165508
Filename
5993518
Link To Document