A choke ring antenna is a directional antenna designed for reception of GNSS signals from satellites. It consists of a number of concentric conductive cylinders around a central antenna.
The first choke ring antennas were invented at JPL; [2] since 1989 they have been improved and extended by many companies.[ citation needed ]
Due to its intricate construction, it is often enclosed in a protective cover or radome when placed outside and exposed to the elements.[ citation needed ]
Choke ring antennas have excellent phase center stability, polarization purity, suppression of radiation below the horizon and multipath rejection. [3] This makes them highly suited for satellite navigation. In a GNSS ground-based receiver, a choke ring antenna can provide millimeter precision measurements for use in surveying and geological measurements. [4]
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