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

• Published in: ETRI journal Vol. 34; no. 5; pp. 767 - 770
• Main Authors: Jeong, Seong Jae, Hwang, Keum Cheol, Hwang, Do‐In
• Format: Journal Article
• Language: English
• Published: 한국전자통신연구원 01.10.2012
• Subjects: capacitive feed; circular polarization; Global Positioning System; GLONASS; Slot antenna; 전자/정보통신공학
• ISSN: 1225-6463; 2233-7326
• DOI: 10.4218/etrij.12.0212.0058

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 28 mm × 28 mm × 4 mm, 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).