Title :
Sigmoid profiled septum: Evaluation of the parabolic reflector with the septum feed horn
Author :
Ilkyu Kim ; Kovitz, Joshua M. ; Rahmat-Samii, Yahya
Author_Institution :
Electr. Eng. Dept., Univ. of California, Los Angeles, Los Angeles, CA, USA
Abstract :
A sigmoid function is used to define a smooth profile for possible use in septum designs. In addition, Particle Swarm Optimization (PSO) is used to optimize the sigmoid-profiled septum polarizer. PSO is applied to a sigmoid septum as well as a stepped septum, and the performance of both designs is further compared. Both septum designs are selected to be optimized for a 25% bandwidth, and the impedance matching and axial ratio is analyzed. Furthermore, the reflector antenna system is investigated utilizing the optimized septum horns as a feed for a 15λ parabolic reflector antenna. A directivity of approximately 32 dB is attained for both parabolic reflector antenna systems.
Keywords :
antenna feeds; horn antennas; impedance matching; particle swarm optimisation; reflector antennas; 15λ parabolic reflector antenna system; PSO; axial ratio; impedance matching; parabolic reflector antenna evaluation; particle swarm optimization; septum feed horn antenna; sigmoid function; sigmoid-profiled septum polarizer design; stepped septum; Antenna feeds; Antenna radiation patterns; Bandwidth; Horn antennas; Particle swarm optimization; Reflector antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4673-5315-1
DOI :
10.1109/APS.2013.6710779
