Choke ring antenna

A choke ring antenna is a particular form of omnidirectional antenna for use at high frequencies (VHF & UHF). It consists of a number of concentric conductive cylinders around a central antenna.

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

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 are notable for their ability to reject multipath signals from a source. Since the path that a signal takes from a transmitter to receiver can be used to measure the distance between the two, this makes it highly suited for satellite navigation and radar applications. In a GNSS ground-based receiver, a choke ring antenna can provide millimeter precision measurements[2] for use in surveying and geological measurements.

The choke ring design was originally developed at the Jet Propulsion Laboratory.[3]

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. "Trimble choke ring antenna". Trimble catalog page.
  3. "Single-depth low multipath choke ring antenna". javad.com. - A basic description of choke ring antenna benefits and limitations.


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