Title :
Efficiency, gain and Q of antennas
Author :
Karlsson, Anders
Author_Institution :
Dept. of Electroscience, Lund Univ.
Abstract :
The fundamental limits of the gain, efficiency and Q-value of an antenna put severe restrictions on small antennas. In this paper it is discussed how one can avoid low efficiency and high Q-values in small antennas by examining the far-field pattern of the antenna. The analysis is based on the expansion of the electromagnetic fields in terms of vector spherical harmonics.
Keywords :
Q-factor; antenna radiation patterns; electromagnetic fields; antenna Q-value; antenna efficiency; antenna gain; electromagnetic fields; far-field pattern; small antennas; vector spherical harmonics; Azimuthal angle; Bandwidth; Dipole antennas; Electromagnetic analysis; Electromagnetic fields; Harmonic analysis; Impedance matching; Maxwell equations; Surface waves;
Conference_Titel :
Antenna Technology: Small and Smart Antennas Metamaterials and Applications, 2007. IWAT '07. International Workshop on
Conference_Location :
Cambridge
Print_ISBN :
1-4244-1088-6
Electronic_ISBN :
1-4244-1088-6
DOI :
10.1109/IWAT.2007.370155
