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

Volume

3

fYear

1996

fDate

21-26 July 1996

Firstpage

1954

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 1996. AP-S. Digest

Conference_Location

Baltimore, MD, USA

Print_ISBN

0-7803-3216-4

Type

conf

DOI

10.1109/APS.1996.549988

Filename

549988