Designing retrodirective reflector on a planar surface by transformation optics

In this paper, we present the design of a retrodirective reflector with dielectric cover on a planar conducting plane based on the transformation optics. By employing a simple linear coordinate transformation, the retrodirective reflector can be achieved with dielectric cover constructed with homogeneous birefringent dielectric medium, which reduces the complexity of practical realization. Such simple design allows us to further realize the retrodirective reflector by alternative layers of normal dielectrics based on the effective medium theory. The proposed design and a practical realization at microwave regime have been validated by full wave electromagnetic simulation, which demonstrates a broadband retrodirective response range from 5 GHz to 10 GHz.