DocumentCode
1013063
Title
A 50-ohm input impedance for helical beam antennas
Author
Kraus, John D.
Author_Institution
Ohio State Univ. Radio Obs., Columbus, OH USA
Volume
25
Issue
6
fYear
1977
fDate
11/1/1977 12:00:00 AM
Firstpage
913
Lastpage
913
Abstract
A helical beam antenna with uniform conductor size has a nominal impedance of 140 ohms. This may not be convenient for some applications. The purpose of this note is to call attention to the fact that the impedance can be adjusted to 50 ohms by increasing the conductor size close to the feed point at the ground plane. This lowers the characteristic impedance of the conductor-ground plane combination (acting as a transmission line) and transforms the helix impedance to a lower value over a substantial bandwidth
Keywords
Antennas; Helical antennas; Impedance-matching; Bandwidth; Bonding; Conductors; Directional antennas; Feeds; Frequency; Impedance; Transmission lines; Wounds; Yagi-Uda antennas;
fLanguage
English
Journal_Title
Antennas and Propagation, IEEE Transactions on
Publisher
ieee
ISSN
0018-926X
Type
jour
DOI
10.1109/TAP.1977.1141687
Filename
1141687
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