Deprecated synonym for radiant power.

Radiant power per unit solid angle, usually expressed in watts per steradian.

The rate of flow of electromagnetic energy, i.e., radiant energy.
Note 1: Radiant power is usually expressed in watts, i.e., joules per second.
Note 2: The modifier is often dropped and "power" is used to mean "radiant power". Deprecated synonyms flux, radiant flux.

1. In communication, the emission of energy in the form of electromagnetic waves.
2. The outward flow of energy from any source in the form of radio waves. [NTIA] [RR]

In fiber optics, half the vertex angle of the cone of light emitted at the exit face of an optical fiber.
Note: The cone boundary is usually defined (a) by the angle at which the far-field irradiance has decreased to a specified fraction of its maximum value or (b) as the cone within which there is a specified fraction of… (Read More →)

At a given frequency, the ratio of the power radiated to the total power supplied to the radiator.

Synonym far-field region.

For an optical fiber, an unbound mode.
Note: In an optical fiber, a radiation mode is one having fields that are transversely oscillatory everywhere external to the waveguide, and which exists even at the limit of zero wavelength. Specifically, a radiation mode is one for which where is the imaginary part (phase term) of the axial propagation constant, integer is… (Read More →)

1. The variation of the field intensity of an antenna as an angular function with respect to the axis.
Note: A radiation pattern is usually represented graphically for the far-field conditions in either horizontal or vertical plane.
2. In fiber optics, the relative power distribution at the output of a fiber or active device as a function of position or… (Read More →)

The resistance that, if inserted in place of an antenna, would consume the same amount of power that is radiated by the antenna.