Ultrathin carpet cloak based on ring resonators

In this work the design of an ultrathin carpet cloak based on a metasurface with ring resonators is demonstrated. The scattering from a triangular bump of a Gaussian beam is suppressed by manipulating the reflection phase along the edge of the bump. This is achieved by an array of closed ring resonators with varying radii. The object to hide can be placed under the bump on a flat ground plane. The performance of the designed cloak in the near field and far field is numerically analyzed at the operation frequency and the successful concealing of the bump is confirmed. The presented cloak has a thin, lightweight design and can find applications in radar and antenna systems.