Patent diagram of a choke ring antenna[1]
Choke ring antenna at a DGPS Reference Station

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]

Benefits

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]

See also

Notes

  1. ^ "U.S. Patent 6,040,805 – Low Profile Ceramic Choke". – Patent for a Low Profile Ceramic Choke, one specific type of choke ring antenna.
  2. ^ Zhang, Li; Schwieger, Volker (26 January 2018). "Investigation of a L1-optimized choke ring ground plane for a low-cost GPS receiver-system". Journal of Applied Geodesy. 12 (1): 55–64. Bibcode:2018JAGeo..12...55Z. doi:10.1515/jag-2017-0026. S2CID 126123321.
  3. ^ Caizzone, Stefano; Schönfeldt, Miriam; Elmarissi, Wahid; Circiu, Mihaela-Simona (18 June 2021). "Antennas as Precise Sensors for GNSS Reference Stations and High-Performance PNT Applications on Earth and in Space". Sensors. 21 (12): 4192. Bibcode:2021Senso..21.4192C. doi:10.3390/s21124192. PMC 8234969. PMID 34207276.
  4. ^ "Trimble GNSS Ti-V2 Choke Ring | GNSS Antennas".


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