Abstract
An analysis about the effects of various metamaterial coatings and background media upon the gain characteristics of a slotted sphere is presented using numerical simulations. It is found that the gain characteristics of a coated slotted sphere can be controlled by varying the electromagnetic parameters of coatings and background media. It is studied that the thickness of different coating layers has a significant effect upon the gain in the forward direction. It is further investigated that a double negative metamaterial coating can be used to greatly enhance the forward direction gain for certain values of the permittivity and the permeability. It is also shown that single near zero and double near zero background media enhance the forward direction gain of a dielectric-coated slotted sphere and reduce the gains for angles closer to polar directions as compared to the free space background.
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