Title :
Multifilar hemispherical helical antennas
Author :
Clark, Jeffrey ; Safaai-Jazi, Abmad
Author_Institution :
Bradley Dept. of Electr. Eng. & Comput. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
This investigation examines the radiation characteristics of a new bifilar hemispherical helical antenna. Directivity, E- and H-plane radiation patterns, axial ratio and input impedance of a few example designs are calculated. It is shown that the bifilar hemispherical helix provides a nearly constant gain over the measured bandwidth of about 14% and generally elliptical polarization with near circular polarization in limited cases.
Keywords :
antenna radiation patterns; directive antennas; electric impedance; electromagnetic wave polarisation; helical antennas; E-plane radiation patterns; H-plane radiation patterns; axial ratio; bifilar helical antenna; constant gain; directivity; elliptical polarization; hemispherical helical antennas; input impedance; multifilar helical antennas; near circular polarization; radiation characteristics; Antenna measurements; Bandwidth; Broadband antennas; Frequency; Gain measurement; Global Positioning System; Helical antennas; Impedance; Polarization; Wire;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2004. IEEE
Print_ISBN :
0-7803-8302-8
DOI :
10.1109/APS.2004.1332093
