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In passive linear systems, complete combining of powers carried by waves fromseveral input channels into a single output channel is forbidden by the energyconservation law. Here, we demonstrate that complete combination of bothcoherent and incoherent plane waves can be achieved using metasurfaces withproperties varying in space and time. The proposed structure reflects waves ofthe same frequency but incident at different angles towards a single direction.The frequencies of the output waves are shifted by the metasurface, ensuringperfect incoherent power combining. The proposed concept of power combining isgeneral and can be applied for electromagnetic waves from the microwave tooptical domains, as well as for waves of other physical nature.

Space-Time Metasurfaces for Perfect Power Combining of Waves