Title :
Cavity backed circularly polarized spiral antennas
Author :
Mehrabani, A. ; Shafai, L.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Manitoba, Winnipeg, MB, Canada
Abstract :
In this paper, a cavity backed spiral antenna is introduced. The antenna is a four-arm Archimedean spiral antenna. To effectively direct the radiation in the upper half space region, the spiral antenna is backed by a conducting cavity, which is peripherally filled by an absorber ring. Antenna radiates circularly polarized waves. The height of the surrounding cavity is only 7mm, which leads to an extremely low profile structure. The polarization purity and antenna gain are investigated over a wide frequency bandwidth of near 1 to 8GHz.
Keywords :
polarisation; spiral antennas; absorber ring; antenna gain; bandwidth 1 GHz to 8 GHz; cavity backed circularly polarized spiral antennas; circularly polarized waves; four-arm Archimedean spiral antenna; polarization; Antenna radiation patterns; Broadband antennas; Cavity resonators; Finite element analysis; Materials; Spirals; Archimedean spiral antennas; Circular polarization; absorbing materials; metallic cavity;
Conference_Titel :
Antenna Technology and Applied Electromagnetics (ANTEM), 2014 16th International Symposium on
Conference_Location :
Victoria, BC
DOI :
10.1109/ANTEM.2014.6887757
