In a medium of high permittivity or conductivity, such as sea water, lake water, or wet earth, a dielectric coated antenna can produce a directional radiation pattern when the coating is eccentric. The current distribution on a finite or infinite dipole with such a coating is obtained. Formulas for the directivity and the radiation pattern of an infinitely long dipole with eccentric coating are also derived.
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Wu et al. (1975) studied this question.
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