Title :
Backfire/endfire radiation performance of quadrifilar helical antennas
Author :
Terada, N. ; Kagoshima, Kenichi
Author_Institution :
NTT Radio Commun. Syst. Lab., Take Yokosuka Kanagawa, Japan
fDate :
6/6/1991 12:00:00 AM
Abstract :
The relations between the radiation pattern and feeding method in quadrifilar helical antennas is discussed. As a result, it is found that by changing the phase of each wire the helical antenna can achieve two radiation modes; both backfire and endfire radiation. These patterns do not have a difference except in radiation direction. Antenna polarisation of quadrifilar helical antenna depends only on the helical winding direction.
Keywords :
antenna feeders; antenna radiation patterns; antenna theory; electromagnetic wave polarisation; microwave antennas; satellite antennas; backfire radiation; circularly polarised waves; endfire radiation; feeding method; helical winding direction; polarisation; quadrifilar helical antennas; radiation modes; radiation pattern;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19910688
