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J Electromagn Eng Sci > Volume 14(4); 2014 > Article
Journal of Electromagnetic Engineering and Science 2014;14(4):360-366.
DOI: https://doi.org/10.5515/JKIEES.2014.14.4.360   
Single-Feed Composite Cavity-Backed Four-Arm Curl Antenna
Son Xuat Ta, Ikmo Park
Department of Electrical and Computer Engineering, Ajou University
Abstract
A single-feed composite cavity-backed four-arm curl antenna is presented for use in global positioning systems (GPS). Its primary radiating element is fed by a vacant-quarter printed ring, which helps the antenna directly match to a $50-{Omega}$ coaxial line and produce a good circular polarization (CP). The cavity-backed reflector is employed to improve the CP radiation characteristics in terms of 3-dB axial ratio (AR) beamwidth and minimum AR value. The optimized design with an overall size of $90{times}90{times}25mm^3$ ($0.4725{lambda}_o{times}0.4725{lambda}_o{times}0.13{lambda}_o$ at 1,575 MHz) results in a ${mid}S_{11}{mid}<-10dB$ bandwidth of 8.66% (1,514-1,651 MHz) and a 3-dB AR bandwidth of 2.23% (1,555-1,590 MHz). The antenna radiates a widebeam right-hand circular polarization and operates with a measured radiation efficiency greater than 90% within its impedance matching bandwidth.
Key words: Curl Antenna, Circular Polarization, Global Positioning System, Vacant-Quarter Printed Ring

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