Title :
Helical array antennas with high efficiency, wide frequency bandwidth and simple structure
Author :
Noro, Takanori ; Kazama, Yasuhiro
Author_Institution :
Labs, Japan Radio Co. Ltd., Tokyo, Japan
Abstract :
A good circularly polarized wave over a wide frequency bandwidth can be produced by 2-turn helical antennas. However, when this type of antenna is used as an element of an array antenna, the axial ratio and antenna gain are greatly deteriorated. The paper describes the fabrication and testing of 5 and 14 element helical array antennas with high efficiency, wide frequency band, and simple structure. They are applicable to INMARSAT systems.
Keywords :
antenna arrays; antenna radiation patterns; broadband antennas; electromagnetic wave polarisation; helical antennas; satellite antennas; INMARSAT systems; antenna gain; axial ratio; bandwidth; circularly polarized wave; efficiency; helical array antennas; radiation patterns; simple structure; Antenna arrays; Antenna measurements; Bandwidth; Feeds; Frequency; Helical antennas; Linear antenna arrays; Satellite antennas; Satellite broadcasting; Satellite communication;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2004. IEEE
Print_ISBN :
0-7803-8302-8
DOI :
10.1109/APS.2004.1329854
