A dielectric-only superstrate inspired from transformation optics for complete reorientation of electromagnetic waves in azimuthal plane

Abstract

Various applications require an antenna to provide coverage in the azimuthal plane while still retaining a low profile. Transformation Optics method can be used to provide novel solutions to fulfill this objective. In this paper, the design of dielectric superstrate inspired from Transformation Optics has been reported which completely reorients the electromagnetic waves emanating from a directive antenna in the azimuthal plane. The physical space is modeled using a virtual space composed of two opposed quarter circles. It is shown analytically that a dielectric-only solution can be obtained from the transformation relations. Use of shift and compression factors has been applied to the material parameter profile to achieve the reorientation. A full wave solution has been presented which reorients the radiation pattern of a classical patch antenna in the azimuthal plane. The solution can be fabricated from isotropic dielectric materials.