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SPHERICAL SLOTTED ANTENNA COATED WITH DOUBLE LAYER OF MATERIALS HAVING COMBINATIONS OF SINGLY AND DOUBLY NEGATIVE PARAMETERS AND CONSEQUENCES OF MODE RESONANCES

By M. Ng Mou Kehn

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Abstract:
This work studies the influence of material coatings, especially combined natural and metamaterials, on the radiation properties of a practical dipole like antenna, represented by a slotted conducting sphere. The selected geometry allows an exact solution to the problem, and thus the development of exact expressions for the antenna parameters, like the radiated power and directivity. It is shown that for materials with combined positive and negative parameters, mode resonances can occur at thinner coatings, the thickness of which can be made diminishingly small by proper selection of coating parameters. In particular, at these resonances the antenna directivity, while being finite, becomes independent of the antenna size and coating parameters.

Citation:
M. Ng Mou Kehn, "Spherical Slotted Antenna Coated with Double Layer of Materials Having Combinations of Singly and Doubly Negative Parameters and Consequences of Mode Resonances," Progress In Electromagnetics Research B, Vol. 45, 223-249, 2012.
doi:10.2528/PIERB12081102

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