The low-profile hemispherical helical antenna with circular polarization radiation over a wide angular range

Author

Hui, H.T. ; Chan, K.Y. ; Yung, E.K.N.

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore

Volume

51

Issue

6

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

1415

Lastpage

1418

Abstract

The low-profile hemispherical helical antenna is studied experimentally and theoretically. This antenna can produce circular polarization radiation over a wide angular range of 90°. The current distribution, the input impedance, the axial ratio, the power gain, and the radiation pattern are rigorously studied. The 3-dB axial ratio bandwidth of a five-turn hemispherical helical antenna is found to be 14.6. In the range of 1.0≤C/λ≤1.3, a relatively stable power gain of more than 9 dB is obtained. The radiation patterns typically consist of a large smooth main lobe with almost no sidelobes. These new antenna characteristics have a potential application in mobile satellite communications.

Keywords

antenna radiation patterns; current distribution; electric impedance measurement; electromagnetic wave polarisation; helical antennas; mobile antennas; mobile satellite communication; axial ratio; circular polarization radiation; current distribution; five-turn helical antenna; hemispherical helical antenna; input impedance; low-profile antenna; mobile satellite communications; power gain; radiation pattern; smooth main lobe; wide angular range; Antenna radiation patterns; Antenna theory; Bandwidth; Current distribution; Helical antennas; Impedance; Mobile antennas; Polarization; Satellite antennas; Satellite communication;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2003.812187

Filename

1208768