RADIATION FIELDS OF THE REFLECTOR ANTENNAS In this section we will calculate the radiation fields from the equivalent plane wave source derived in the previous section. From the equivalence theorem, the radiation from an aperture antenna is equivalent to that from electric and magnetic currents J and M on the aperture. where In is an outward unit normal vector on the aperture 5 and the subscript t denotes tangential components of the field. The electromagnetic fields from the currents are expressed in terms of vector potentials 14 and 14'.
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