# If the solid angle subtended by the main beam of an antenna is 0.5 steradian  then what will be the directivity of the antenna?

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If the solid angle subtended by the main beam of an antenna is 0.5 steradian  then what will be the directivity of the antenna?

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Step 1

If the radiation intensity of an antenna is assumed to be constant, then all the power coming out of a transmitting antenna flows through a solid angle. That solid angle is called bean solid angle or beam area. Unit of beam solid angle is steradian. It can be expressed by the following equation:

Step 2

In this case, the value of the beam solid angle is given as

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### Electrical Engineering 