Metamaterial Spheroidal Cavity to Enhance Dipole Radiation

Metamaterials have been considered for their potential to improve the radiation characteristics of sources. A novel geometry consisting of a semioblate spheroidal cavity containing two layers, one made of DPS and the other made of DNG metamaterial, and built underneath an aperture in infinite metallic plane is considered. An exact analytical solution is obtained and its numerical evaluation demonstrates a significant improvement of the directive radiation of a dipole source, with the appropriate combination of the ordinary double positive (DPS) and DNG layers.