Abstract
In this letter, a novel bifunctional coating layer is proposed for a cylindrical antenna using transformation optics. This layer not only cloaks the omnidirectional antenna from an external source, but also enhances its directivity at the same time. To achieve this, an appropriate coordinate transformation is established so that the cylindrical wavefronts originating from the antenna would be transformed into plane waves. The material properties of the proposed cover are numerically derived by solving the Laplace's equation. Full-wave simulations are performed to verify both the directivity enhancement and cloaking functions of the designed coating layer. Thus, it can be effectively utilized in highly scattering multiple-antenna environments as a shielding mechanism.
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