Abstract
The near fields of a cylindrical transmitting antenna have been computed in free space by modifying a variational impedance formulation. Current distributions that decay linearly with distance from the ends of the antenna excite strong tangential and parallel electric fields near the antenna ends. Such fields are avoided by choosing the axial antenna current to vary in proportion to the square root of the distance from the antenna ends. The electric fields parallel to the antenna surface decrease with increasing distance ρ from the antenna axis near the driving point and the antenna ends, but are found to increase in an intermediate range. The magnetic fields exhibit an approximately inversedistance dependence, but the deviations from this inverse ρ dependence are significant for establishing a correlation with the variations of the electric fields.
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