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; since 1989 they have been improved and extended by many companies.
Due to its intricate construction, it is often enclosed in a protective cover or radome when placed outside and exposed to the elements.
Benefits
Choke ring antennas have excellent phase center stability, polarization purity, suppression of radiation below the horizon and multipath rejection. 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.
See also
- Trimble Inc. - one manufacturer of this product.
- Patch antenna - a DIRECTIONAL type of antenna.
- Magellan Navigation - another manufacturer of this product.
Notes
- "U.S. Patent 6,040,805 – Low Profile Ceramic Choke". – Patent for a Low Profile Ceramic Choke, one specific type of choke ring antenna.
- 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.
- 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.
- "Trimble GNSS Ti-V2 Choke Ring | GNSS Antennas".
 | This engineering-related article is a stub. You can help Misplaced Pages by expanding it. |
 | This article related to radio communications is a stub. You can help Misplaced Pages by expanding it. |