A uniformly illuminated rectangular aperture situated in the xy plane is 2 m high (along x) and

Question:

A uniformly illuminated rectangular aperture situated in the x–y plane is 2 m high (along x) and 1 m wide (along y). If f = 10 GHz, determine
(a) The beam widths of the radiation pattern in the elevation plane (x–z plane) and the azimuth plane (y–z plane), and
(b) The antenna directivity D in dB.