Miniaturized wideband circularly polarized hybrid dielectric resonator antenna / by Matthieu Caillet, Michel Clénet and Yahia M.M. Antar.: D68-6/125-2012E-PDF

This document reports on a compact circularly polarized hybrid dielectric resonator antenna (DRA) operating over the entire Global Navigation Satellite Systems (GNSS) frequency band, which includes the GPS, Galileo and GLONASS frequency bands. The proposed design is composed of a small cylinder of ceramic, a single layer substrate material and a back plate housing, and is therefore relatively easy to fabricate. The used concept consists of 4 sequentially rotated arc-shaped slots etched in the ground plane, which radiate in the lower part of the frequency band and feed the DRA in the upper part. This antenna was fabricated and characterized. It exhibits a good impedance matching from 1.22 to 1.71 GHz (33% bandwidth) thus covering the complete GNSS frequency band. The achieved gain is over 0 dBic and the axial ratio (AR) is lower than 2 dB at boresight over the 1.25-1.63 GHz frequency band. The halfpower beamwidth larger than 95°, and the AR beamwidth (AR < 3 dB) is over 130°. Despite a slight frequency shift observed during the measurements, a good agreement was noted with the simulation. The antenna surface, including the ground plane, is 100x100 mm2 and its height considering the back plate housing is 35 mm. To the knowledge of the authors, this is the only antenna of this size that covers the complete GNSS frequency bandwidth with such excellent overall characteristics.

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