Title :
Central-fed hemispherical helical antenna
Author :
Chan, K.Y. ; Hui, H.T. ; Yung, E.K.N.
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China
Abstract :
The characteristics of a hemispherical helical antenna with central-fed are investigated by experiment. Results for a 3-turn hemispherical helix indicate that circular polarization can be obtained over a wide angular range with relatively high gain of about 8 dB. The frequency bandwidth for a 3-dB axial ratio criterion is /spl sim/11%, with a nearly resistive input impedance of 163 /spl Omega/.
Keywords :
antenna feeds; helical antennas; polarisation; 163 ohm; 3-dB axial ratio; 3-turn hemispherical helix; angular range; central-fed hemispherical helical antenna; circular polarization; frequency bandwidth; high gain antenna; resistive input impedance; Bandwidth; Coaxial components; Conductors; Equations; Frequency; Geometry; Helical antennas; Impedance; Polarization; Wire;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2001. IEEE
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-7070-8
DOI :
10.1109/APS.2001.959521
