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Concentric Annular Ring Slot Antenna for Global Navigation Satellite Systems

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2 Author(s)
Ramirez, M. ; Dept. of Telecommun. & Syst. Eng., Univ. Autonoma de Barcelona (UAB), Barcelona, Spain ; Parron, J.

In this letter, we present the design of a concentric annular ring slot antenna with right-hand circular polarization. Two concentric rings have been etched in the ground plane to generate a dual-band response. A broadband feeding network and a thicker substrate below the slots have been used to improve the axial-ratio bandwidth and gain. The proposed antenna covers the bands of the positioning systems GPS and Galileo. Experimental results show a 3-dB axial-ratio bandwidth for the lower and upper band of 19.2% and 18%, respectively. The measured gain is higher than 4 dB in both bands.

Published in:

Antennas and Wireless Propagation Letters, IEEE  (Volume:11 )