DocumentCode :
997574
Title :
On the quality factor of strip and line source antennas and its relationship to superdirectivity ratio
Author :
Rhodes, Donald R.
Author_Institution :
North Carolina State University, Raleigh, NC, USA
Volume :
20
Issue :
3
fYear :
1972
fDate :
5/1/1972 12:00:00 AM
Firstpage :
318
Lastpage :
325
Abstract :
Exact formulas are derived for the quality factor 
of strip and line source antennas. Contrary to popular opinion, none of them is equal to Taylor\´s superdirectivity ratio 
or to 
. But in the case of 
-plane strip sources (the complement of the type of strip source treated by Woodward and Lawson) the value of is precisely equal to 
, where 
is a generalized superdirectivity ratio that reduces to Taylor\´s when the edge exponent 
and the pattern weighting exponent 
are both zero. In the case of 
-plane strip sources the value of is approximately equal to 
, and for -plane line sources of vanishing width 
it is approximately equal to ![[(2/\\pi) \\ln (2.516\\lambda /\\pi a)]\\gamma _{\\alpha }^{1}](/images/tex/13349.gif)
.
of strip and line source antennas. Contrary to popular opinion, none of them is equal to Taylor\´s superdirectivity ratio or to . But in the case of -plane strip sources (the complement of the type of strip source treated by Woodward and Lawson) the value of is precisely equal to , where is a generalized superdirectivity ratio that reduces to Taylor\´s when the edge exponent and the pattern weighting exponent are both zero. In the case of -plane strip sources the value of is approximately equal to , and for -plane line sources of vanishing width it is approximately equal to .Keywords :
Aperture antennas; Line source antennas; Aerospace engineering; Bandwidth; Energy measurement; Linear systems; Magnetic circuits; Magnetic resonance; Q factor; RLC circuits; Resonant frequency; Strips;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1972.1140191
Filename :
1140191
Link To Document :
