The radial component of the radiated power density of an infinitesimal dipole of length 1 ...

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The radial component of the radiated power density of an infinitesimal dipole of length 1<1 is given by W ay =W, ? =A,sin?e/r (W/m?), where A, is the peak value of the power density, e is the usual spherical coordinate, ? is the radial unit vector. Determine the maximum directivity of the antenna and express the directivity as a function of directional angles e and o. The radial component of the radiated power density of an infinitesimal dipole of length 1<1 is given by W ay =W, ? =A,sin?e/r (W/m?), where A, is the peak value of the power density, e is the usual spherical coordinate, ? is the radial unit vector. Determine the maximum directivity of the antenna and express the directivity as a function of directional angles e and o.