DocumentCode :
2800230
Title :
Frequency independent antennas
Author :
Rumsey, V.
Author_Institution :
University of Illinois, Urbana, IL, USA
Volume :
5
fYear :
1966
fDate :
21-25 March 1966
Firstpage :
114
Lastpage :
118
Abstract :
There is a class of antennas whose pattern as well as impedance is practically independent of frequency for all frequencies above a certain value. The general formula for their shape is 
where 
are the usual spherical coordinates, a and 
are constants and 
is any function of 
. Assuming a to be positive, 
ranges from - 
to some finite value which determines the low frequency limit. For such antennas a change of frequency is equivalent to a rotation of the antenna about 
. It appears that the pattern converges to the characteristic pattern as the frequency is raised, if a is not , and that the impedance converges to the characteristic impedance for all 
.
where are the usual spherical coordinates, a and are constants and is any function of . Assuming a to be positive, ranges from - to some finite value which determines the low frequency limit. For such antennas a change of frequency is equivalent to a rotation of the antenna about . It appears that the pattern converges to the characteristic pattern as the frequency is raised, if a is not , and that the impedance converges to the characteristic impedance for all .Keywords :
Antenna measurements; Bandwidth; Directional antennas; Frequency measurement; H infinity control; Impedance measurement; Loss measurement; Performance loss; Shape; Wavelength measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
1958 IRE International Convention Record
Conference_Location :
New York, NY, USA
Type :
conf
DOI :
10.1109/IRECON.1957.1150565
Filename :
1150565
Link To Document :
