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
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