Title :
Folded loop C.P. antenna
Author :
Li, R.L. ; Fusco, V.F.
Author_Institution :
Sch. of Electr. & Electron. Eng., Queen´s Univ., Belfast, UK
Abstract :
A new type of wire loop antenna has been developed for the production of circular polarization. The antenna was obtained by twisting a one-wavelength square loop with two small gaps at the middle of its two non-radiating sides. The twisted loop antenna can achieve circular polarization with axial ratio less than 1 dB at broadside. The 3-dB axial ratio beamwidth is about /spl plusmn/30/spl deg/, over which the co-polarization component is almost constant. In addition, the antenna also has excellent input impedance characteristics over the 3-dB axial ratio bandwidth. The input VSWR is about 1.2 near the design frequency.
Keywords :
antenna radiation patterns; electric impedance; electromagnetic wave polarisation; loop antennas; wire antennas; 3-dB axial ratio beamwidth; circular polarization; folded loop antenna; input VSWR; input impedance characteristics; one-wavelength square loop; radiation patterns; twisted loop antenna; wire loop antenna; Antenna measurements; Bandwidth; Computational modeling; Current distribution; Design optimization; Frequency; Gain measurement; 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.2001.959437
