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- 26th March 2010, 23:11 #1

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## 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

- 26th March 2010, 23:11

- 27th March 2010, 00:49 #2

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## 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.

- 27th March 2010, 00:49

- 27th March 2010, 13:26 #3

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## Re: Radiated power per unit Solid Angle

- 27th March 2010, 13:26

- 31st March 2010, 13:32 #4

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## 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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