Title :
Adjustable multifilar helical antenna with reduced frequency scanning
Author :
du Troit, C.F. ; Chadwick, P.E. ; Butland, R.J. ; Vaughan, R.G.
Author_Institution :
Deltec New Zealand Ltd., New Zealand
Abstract :
An adjustable "scanning mode" multifilar helical antenna with reduced frequency scanning is described. The antenna was designed for the Australian Mobile Satellite System, operating at about 1.6 GHz. The design described features a centre-fed arrangement, which is shown to substantially reduce frequency scanning in this type of antenna. A novel mechanical adjustment technique is also described, which allows the main beam of the antenna to be tilted.
Keywords :
UHF antennas; antenna feeds; helical antennas; mobile satellite communication; satellite antennas; scanning antennas; 1.6 GHz; Australian Mobile Satellite System; UHF; adjustable multifilar helical antenna; adjustable scanning mode; centre-fed arrangement; mechanical adjustment technique; reduced frequency scanning; Antenna arrays; Antenna feeds; Antenna radiation patterns; Bandwidth; Frequency; Helical antennas; Phased arrays; Resonance;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1999. IEEE
Conference_Location :
Orlando, FL, USA
Print_ISBN :
0-7803-5639-x
DOI :
10.1109/APS.1999.789060
