An antenna has a field pattern E (?) =cos ?. cos 2?. The first null beam width of the antenna is:

Name: An antenna has a field pattern E (?) =cos ?. cos 2?. The first null beam width of the antenna is:
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Question

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The first null beam width occurs when the field pattern first becomes zero. For the given pattern E(θ) = cosθ. cos2θ, the first null occurs when either cosθ = 0 or cos2θ = 0. The first condition (cosθ = 0) occurs at θ = 90°, which is the first null beam width.

An Antenna Has a Field Pattern E (?) =Cos