Title :
Small antenna input impedances that contradict Chu-Wheeler Q criterion
Author :
Underhill, M.J. ; Harper, M.
Author_Institution :
Centre for Solid State Electron., Univ. of Surrey, Guildford, UK
fDate :
5/29/2003 12:00:00 AM
Abstract :
Analysis of the small tuned folded dipole input impedance gives a limiting bandwidth proportional to frequency and antenna dimension. A simple antenna mode expansion also directly contradicts the Chu-Wheeler Q criterion. A line-integral potential method gives an additional logarithmic Q reduction factor. Untuned field sensors may have additional coupling losses.
Keywords :
antenna theory; dipole antennas; electric impedance; Chu-Wheeler Q criterion; antenna dimension; antenna mode expansion; coupling losses; frequency; limiting bandwidth; line-integral potential method; logarithmic Q reduction factor; small antenna input impedances; tuned folded dipole; untuned field sensors;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20030540
