Anomalously Perfect Reflections Based on 3-Bit Coding Metasurfaces

Herein, a new design method to realize anomalously perfect reflections based on digital coding metasurfaces is proposed. Previous studies on perfect reflections usually rely on impedance matching, which requires complicated analyses and calculations. Based on the digital design of coding metasurfaces, a simple design method to generate anomalously perfect reflections for different reflection angles with high efficiency is presented. 3-bit digital coding units are designed and verified to provide reflection phase responses of 0 degrees, 45 degrees, 90 degrees, 133 degrees, 176 degrees, 221 degrees, 269 degrees, and 302 degrees. Four digital coding patterns for different reflection angles are created to demonstrate the anomalously perfect reflections. Numerical simulations and experimental results have good agreements, suggesting the powerful potentials of the digital coding metasurface in controlling the electromagnetic waves.