---
title: "Choke ring antenna"
chunk: 1/1
source: "https://en.wikipedia.org/wiki/Choke_ring_antenna"
category: "reference"
tags: "science, encyclopedia"
date_saved: "2026-05-05T11:46:20.712575+00:00"
instance: "kb-cron"
---

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 ==
Patch antenna - a directional type of antenna.
Magellan Navigation - one manufacturer of this product.
Trimble Inc. - another manufacturer of this product.


== Notes ==