Design of Small CRPA Arrays for Dual-Band GPS Applications

Gangil BYUN
Seung Mo SEO
Hosung CHOO

IEICE TRANSACTIONS on Communications   Vol.E97-B    No.6    pp.1130-1138
Publication Date: 2014/06/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E97.B.1130
Type of Manuscript: PAPER
Category: Antennas and Propagation
GPS antenna,  CRPA array,  coupled feed structure,  

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This paper proposes the design of small CRPA arrays for dual-band Global Positioning System (GPS) applications. The array consists of five elements and is mounted on a circular ground platform with a diameter of 15-cm. Each antenna element has a coupled feed structure and consists of a feed patch and two radiating patches for dual-band operation. An external chip coupler is utilized for a broad circular polarization (CP) bandwidth, and its measured characteristics are taken into account in our simulation for more accurate performance estimation. Detailed parameters are optimized by using a genetic algorithm (GA) in conjunction with the FEKO EM simulator. The optimized antenna is fabricated on a ceramic substrate, and its performance is measured in a full anechoic chamber. Furthermore, a field test is also conducted to verify the signal-to-noise ratio (SNR) for real GPS satellite signals. The results prove that the proposed array is suitable for use in GPS CRPA applications.