Radiated power per unit Solid Angle

1. Radiated power per unit Solid Angle

Hi All
can somebody define what is meant by the "Radiated power per unit Solid Angle"? First define what is Solid Angle? i dont understand that.
thnkx

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2. Radiated power per unit Solid Angle

It's a technical term in geometry. (The german term is Raumwinkel). It's related to sphere surface. Consult a mathematics or optics handbook.

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4. Re: Radiated power per unit Solid Angle

Hi,
Solid angle is the spatial angle. It is different from the planar angle. An example is the angle at the vertex of a cone. An antenna radiates energy in a solid angle defined by the azimuth angle and elevation angle. Mathematically, the value of solid angle can vary from 0 to 4Pi.

Imagine that a power 'P' Watts is fed to an antenna whose radiation pattern has a solid angle of Φ. Then the average radiated power per unit solid angle is P/Φ. In general, the radiated power per unit solid angle at any point in space will be a function of the direction of that point in terms of azimuth angle and the elevation angle.

Hope this helps.

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