Full-duplex reflective beamsteering metasurface featuring magnetless nonreciprocal amplification

Nonreciprocal radiation refers to electromagnetic wave radiation in which a structure provides different responses under the change of the direction of the incident field. Modern wireless telecommunication systems demand versatile apparatuses which are capable of full-duplex nonreciprocal wave processing and amplification, especially in the reflective state. To realize such a functionality, we propose an architecture in which a chain of series cascaded radiating patches are integrated with nonreciprocal phase shifters, providing an original and efficient apparatus for full-duplex reflective beamsteering. Such an ultrathin reflective metasurface can provide directive and diverse radiation beams, large wave amplification, steerable beams by simply changing the bias of the gradient active nonmagnetic nonreciprocal phase shifters, and is immune to undesired time harmonics. Having accomplished all these functionalities in the reflective state, the metasurface represents a conspicuous apparatus for efficient, controllable and programmable wave engineering. Metasurfaces promise complex functionalities in electromagnetic wave control. Here the authors present an architecture for full-duplex reflective beamsteering based on series-connected radiative patches and nonreciprocal phase shifters.

Automated summary

The study introduces an architecture combining series-connected radiative patches and nonreciprocal phase shifters to achieve full-duplex reflective beamsteering, demonstrating the efficiency and programmability of ultrathin reflective metasurfaces in electromagnetic wave control.