Design of Reconfigurable Metasurface with Independent Control of Amplitude and Phase

Abstract

In this paper, a reconfigurable metasurface with independent control of reflection amplitude and phase is proposed in C-band. The unit-cell of the metasurface is a dual resonance structure, capable of providing 360° reflection phase variation by adjusting varactors. PIN diodes are connected in series in the resonant structure to control the reflection amplitude. The simulation results show that the reflection amplitude of the unit-cell can range from -16dB to -2.7 dB with reflection phase achieving 360° coverage. To further exhibit the functionality of the proposed metasurface, different Taylor amplitude distributions and phase distributions are applied in an 8×8 array to form different beams. Compared with phase-only metasurfaces, the proposed metasurface is demonstrated to achieve scattering patterns with lower side lobe level (SLL). It may find vast applications in holographic imaging and wireless communication.