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A cylindrical antenna of infinite length imbedded in a concentric dielectric rod has been studied in detail by using a Fourier transform technique. The antenna radius is held constant while the thickness of the dielectric rod is varied over a wide range. The results have been compared against the corresponding properties of an infinite antenna in free space. It is found that the presence of the dielectric gives rise to a transmission current in addition to the radiation current. Increasing the thickness of the dielectric layer tends to increase the transmission current, decrease the radiation current and made the radiation pattern more broadside.
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Chung-Yu Ting (1967) studied this question.
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