J Electromagn Eng Sci Search

CLOSE

 J Electromagn Eng Sci > Volume 13(4); 2013 > Article
 Journal of Electromagnetic Engineering and Science 2013;13(4):224-232. DOI: https://doi.org/10.5515/JKIEES.2013.13.4.224
 Wide-Beam Circularly Polarized Crossed Scythe-Shaped Dipoles for Global Navigation Satellite Systems Son Xuat Ta1, Jea Jin Han1, Ikmo Park1, Richard W. Ziolkowski2 1Department of Electrical and Computer Engineering, Ajou University2Department of Electrical and Computer Engineering, University of Arizona Abstract This paper describes composite cavity-backed crossed scythe-shaped dipoles with wide-beam circularly polarized (CP) radiation for use in Global Navigation Satellite Systems. Each branch of the dipole arm contains a meander line, with the end shaped like a scythe to achieve a significant reduction in the size of the radiator. For dual-band operation, each dipole arm is divided into two branches of different lengths. The dipoles are crossed through a $90^{circ}$ phase delay line of a vacant-quarter printed ring to achieve CP radiation. The crossed dipoles are incorporated with a cavity-backed reflector to make the CP radiation unidirectional and to improve the CP radiation beamwidth. The proposed antennas have broad impedance matching and 3-dB axial ratio bandwidths, as well as right-hand CP radiation with a wide-beamwidth and high front-to-back ratio. Key words: Cavity-Backed Reflector, Circular Polarization, Meander Line, Phase Delay Line, Scythe Shape

Editorial Office
#706 Totoo Valley, 217 Saechang-ro, Yongsan-gu, Seoul 04376, Korea
Tel: +82-2-337-9666    Fax: +82-2-6390-7550    E-mail: admin-jees@kiees.or.kr