Isotropic Radiator

(redirected from Isotropic antennas)

isotropic radiator

[¦ī·sə¦trä·pik ′rād·ē‚ād·ər]
(physics)
An energy source that radiates uniformly in all directions.

Isotropic Radiator

 

an imaginary antenna emitting electromagnetic energy of equal intensity in all directions. It has a circular directivity pattern in any plane. The isotropic radiator is used in antenna technology as a standard for the comparative evaluation of the directional characteristics of various antennas, particularly in determining the front-to-rear factor. A great deal of attention is being devoted to the design of antennas whose directional properties are close to those of an isotropic radiator. In particular, such antennas are required for use on artificial earth satellites that are unstabilized in space. Antennas of that type make possible the maintenance of communications with the satellite when it changes its position in space.

References in periodicals archive ?
Anritsu Company said it has expanded its electromagnetic field (EMF) measurement system with the introduction of isotropic antennas that provide frequency coverage from nine kHz to six GHz.
The two isotropic antennas employ tri-axis sensors with an integrated RF switch device, microcontroller and memory.
4, 2015 /PRNewswire/ -- Anritsu Company expands its Electromagnetic Field (EMF) Measurement System with the introduction of isotropic antennas that provide frequency coverage from 9 kHz to 6 GHz.
Anritsu also offers a third isotropic antenna with frequency coverage of 0.
Isotropic antennas provide a basis for describing how well an antenna can perform.
If a test antenna's planar radiation pattern exhibits greater than 0 dBi for 180[degrees] in the forward direction and less than 0 dBi for 180[degrees] in the rearward direction, then the test antenna can transmit farther than an isotropic antenna in the forward direction and less in the rearward direction.