Abstract
This letter presents a miniaturized geodetic choke ring antenna for high-precision Global Navigation Satellite System applications. The antenna consists of crossed dipoles that are fed by two coaxial feedlines, a resonant ring over the dipoles, a cavity-backed reflector with a saw-tooth structure, and a miniaturized choke ring. The choke ring alongside the saw-tooth structure can improve the front-to-back ratio (FBR) by almost 10 dB. The proposed antenna achieves a gain of over 7 dBic, a high FBR of greater than 25 dB, and an operating band covering 1.17–1.60 GHz in which the return loss is lower than −10 dB and the axial ratio is lower than 3 dB when zenith angle θ < 70°.
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