Abstract
The electromagnetic (EM) radiation problem for a prolate spheroidal antenna with a double-negative (DNG) metamaterial (MTM) radome is studied using the method of separation of the spheroidal scalar wave functions. The unknown expansion coefficients are found by applying the boundary conditions at each spheroidal surface. Numerical results show that the radiation pattern of a prolate spheroidal antenna coated with a half-wavelength confocal DNG MTM radome is practically the same as the uncoated antenna pattern, which can be intuitively explained by suggesting that the inductance introduced by the DNG MTM radome may cancel the capacitance introduced by the air layer between the antenna and the radome. This means that the DNG MTM radome can be electrically transparent to the antenna, and has almost no effect on the antenna's radiation pattern. Our results also show that this DNG MTM radome can be placed much closer to the antenna than a conventional dielectric one with a given system performance; therefore the size of the antenna system can be significantly reduced.
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