Radiation by slotted elliptic antenna coated by lossy and lossless multi-dielectrics metamaterials

The far field characteristics of an axially slotted elliptical antenna coated with lossy and lossless multi-dielectric metamaterials layers are investigated. The fields in the various regions are expressed in terms of complex Mathieu functions. The unknown field expansion coefficients in every region are obtained by applying the boundary conditions at various surfaces. Numerical results are obtained for the radiation pattern and antenna gain for the case of lossy and lossless metamaterials coatings. The obtained numerical results show that slotted antenna coated with lossy multi-dielectric metamaterials could have higher gain and lower side lobes for specific parameters than single layered antenna.