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http://dx.doi.org/10.4218/etrij.12.0212.0058

Compact Circularly Polarized Antenna with a Capacitive Feed for GPS/GLONASS Applications  

Jeong, Seong Jae (Division of Electronics and Electrical Engineering, Dongguk University-Seoul)
Hwang, Keum Cheol (Division of Electronics and Electrical Engineering, Dongguk University-Seoul)
Hwang, Do-In (Fourstech)
Publication Information
ETRI Journal / v.34, no.5, 2012 , pp. 767-770 More about this Journal
Abstract
This letter presents a novel compact circularly polarized patch antenna for Global Positioning System/Global Navigation Satellite System (GPS/GLONASS) applications. The proposed antenna is composed of a simple square radiating patch fed by a capacitive dual-feeder to increase the impedance bandwidth and a lumped element hybrid coupler to achieve the broadband characteristic of the axial ratio (AR). The realized antenna dimensions are $28mm{\times}28mm{\times}4mm$, which is the most compact size among the dual-band GPS/GLONASS antennas reported to date. The measured results demonstrate that the proposed antenna has a gain of 2.5 dBi to 4.2 dBi and an AR of 0.41 dB to 1.51 dB over the GPS/GLONASS L1 band (1.575 GHz to 1.61 GHz).
Keywords
Slot antenna; circular polarization; Global Positioning System; GLONASS; capacitive feed;
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