Question: A half-wave dipole antenna is known to have a maximum effective area, given as A max . (a) Write the maximum directivity of this antenna

A half-wave dipole antenna is known to have a maximum effective area, given as Amax.

(a) Write the maximum directivity of this antenna in terms of Amax and wavelength λ.

(b) Express the current amplitude, I0, needed to radiate total power, Pr, in terms of Pr, Amax, and λ.

(c) At what values of θ and ϕ will the antenna effective area be equal to Amax?

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