Title :
Conical beam control of quadrifilar helical antennas
Author :
Morishita, H. ; Takahashi, S. ; Kamei, T.
Author_Institution :
Dept. of Electr. Eng., Nat. Defense Acad., Yokosuka, Japan
fDate :
10/1/1998 12:00:00 AM
Abstract :
The conical beam control of quadrifilar helical antennas with a fixed helical arm length is investigated. By adjusting a portion of the antenna height to vary the pitch angle, the elevation angle of the beam direction can be controlled with an almost constant gain. It is found that the elevation angle of the beam direction varies in proportion to the pitch angle
Keywords :
antenna radiation patterns; antenna theory; helical antennas; microwave antennas; antenna height adjustment; beam direction; conical beam control; constant gain; elevation angle; fixed helical arm length; pitch angle; quadrifilar helical antennas;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19981370
