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J Electromagn Eng Sci > Volume 14(3); 2014 > Article
Journal of Electromagnetic Engineering and Science 2014;14(3):299-305.
DOI: https://doi.org/10.5515/JKIEES.2014.14.3.299   
Single-Feed, Wideband, Circularly Polarized, Crossed Bowtie Dipole Antenna for Global Navigation Satellite Systems
Huy Hung Tran, Son Xuat Ta, Ikmo Park
Department of Electrical and Computer Engineering, Ajou University
Abstract
A wideband circularly polarized (CP) antenna with a single feed is proposed for use in global navigation satellite systems. Its primary radiation elements are composed of two orthogonal bowtie dipoles, which are equipped with double-printed vacant-quarter rings to allow direct matching of the antenna to a single $50-{Omega}$ coaxial line and to produce CP radiation. The crossed bowtie dipole is appropriately incorporated with a planar metallic reflector to produce the desired unidirectional radiation pattern as well as to achieve a wideband characteristic in terms of impedance matching and axial ratio (AR) bandwidths. The designed antenna was fabricated and measured. The prototype antenna with an overall 1.2-GHz frequency size of $0.48{lambda}_o{times}0.48{lambda}_o{times}0.25{lambda}_o$ produced a measured ${mid}S_{11}{mid}$<-10 dB bandwidth of 1.05-1.79 GHz and a measured 3-dB AR bandwidth of 1.12-1.64 GHz. It also showed right-hand CP radiation with a small gain variation (${pm}0.3dB$) and high radiation efficiency (>93%) over the operational bandwidth.
Key words: Circular Polarization, Crossed Bowtie Dipole, Global Navigation Satellite System, Single Feed, Wideband

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