Title :
2-turn helical antenna with extremely small pitch angle
Author :
Ze-Hai, Wu ; Yung, Edward K N
Author_Institution :
Department of Electronic Engineering, City University of Hong Kong, No.83, Tat Chee Avenue, China
Abstract :
A 2-turn helical antenna with small pitch angle between 0.60 and 30 has been studied as a radiation element of circular polarization waves in this paper. The antenna with pitch angle 20 exhibits a 3-dB axial ration bandwidth of 9.8%, and the optimal axial ratio of 0.1dB. When the pitch angle decreases to 0.60, the 3-dB axial ration bandwidth and the best axial ratio are 5% and 0.15dB respectively. Variation of on-axis axial ratio as a function of the straight wire height h has been computed. Experimental verification of the antenna performance is presented. The antenna with low profile and high polarization purity characteristics is suitable for application of array antenna.
Keywords :
Antenna arrays; Antenna measurements; Bandwidth; Computational modeling; Directional antennas; Directive antennas; Frequency measurement; Helical antennas; Polarization; Wire; Circular polarization; helical antenna; small pitch angle;
Conference_Titel :
Antennas and Propagation, 2006. EuCAP 2006. First European Conference on
Conference_Location :
Nice
Print_ISBN :
978-92-9092-937-6
DOI :
10.1109/EUCAP.2006.4584661
