Title :
Conical radiation pattern characteristics of a quadrifilar helical antenna
Author :
Morishita, H. ; Takahashi, S. ; Kamei, T.
Author_Institution :
Dept. of Electr. Eng., Nat. Defense Acad., Kanagawa, Japan
Abstract :
In mobile satellite communication system, circularly polarized omnidirectional antennas are preferable for vehicle antennas because a satellite tracking system in azimuth direction is not necessary. As one type of these antennas, a quadrifilar helical antenna (QHA) has been proposed. A QHA can radiate a circularly polarized conical beam. It is desired that the elevation angle of the beam direction can become variable corresponding to the attitude of the vehicles. The conical radiation pattern characteristics of a QHA are analyzed numerically and the parameters used to change the beam direction are investigated.
Keywords :
antenna radiation patterns; electromagnetic wave polarisation; helical antennas; mobile antennas; mobile satellite communication; satellite antennas; attitude; beam direction; circularly polarized conical beam; circularly polarized omnidirectional antennas; conical radiation pattern characteristics; elevation angle; mobile satellite communication system; satellite tracking system; vehicle antennas; Antenna radiation patterns; Artificial satellites; Azimuth; Directive antennas; Helical antennas; Mobile antennas; Polarization; Satellite antennas; Satellite communication; Vehicles;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1996. AP-S. Digest
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-3216-4
DOI :
10.1109/APS.1996.549988
