# Experimental Demonstration of A Dual-Input/Dual-Output Reflective Impedance Metasurface

## TL;DR

This paper demonstrates a dual-input/dual-output reflective impedance metasurface capable of independently controlling two incident waves to reflect at specified angles with high efficiency, validated through experimental measurements.

## Contribution

It introduces a novel dual-input/dual-output metasurface design that independently controls two reflected beams, advancing metasurface multiplexing capabilities.

## Key findings

- Achieved independent reflection angles for two incident waves.
- Demonstrated high illumination efficiency of at least 89%.
- Validated the design through experimental characterization at 9.93 GHz.

## Abstract

This paper presents the experimental demonstration of a dual-input/dual-output reflective impedance metasurface. The design of the metasurface relies on the Method of Moments and leverages auxiliary surface waves to achieve anomalous reflection of two impinging plane waves with controlled sidelobe levels. The two beams are chosen independently compared to those in a conventional phase-gradient metasurface where the design presents a single slope to achieve a certain reflection and all other incident beams would depend on that slope. A prototype that ensures maximum directivity at two prescribed reflection angles for the two input waves is then fabricated on a Rogers RO3003 printed-circuit board using 42 metawires loaded with printed capacitors. The proposed metasurface is capable of reflecting an incident beam from $-20^\circ$ to $-55^\circ$ and a second from $+10^\circ$ to $50^\circ$ at 9.93 GHz. The metasurface is experimentally characterized and an illumination efficiency of at least 89% is calculated for each of the reflected waves, indicating a high multiplexing efficacy.