Air interface electrically tunable metasurface and radiation device

A radiation apparatus, comprising:

• a multi-channel dual-polarized antenna array and an air-interface electrically-tunable metasurface, the air-interface electrically-tunable metasurface comprising:
• a dielectric substrate, comprising a plurality of dielectric substrate units;
• and
• a metal structure array, comprising a plurality of metal structures arranged on the dielectric substrate units and one to one corresponding to positive/negative 45-degree dual-polarized antenna units, wherein the metal structure comprises two metal units and a microwave diode, each metal unit comprises two axisymmetrically distributed metal sheets, the two metal units are symmetrically distributed around a center of the positive/negative 45-degree dual-polarized antenna unit, and the metal sheets and the microwave diode cooperate to adjust a phase of a positive 45-degree polarized or negative 45-degree polarized electromagnetic wave signal emitted by the positive/negative 45-degree dual-polarized antenna unit,
• wherein the multi-channel dual-polarized antenna array comprises a plurality of positive/negative 45-degree dual-polarized antenna units configured to emit an electromagnetic wave signal, and the air-interface electrically-tunable metasurface is arranged directly above a radiation direction of the multi-channel dual-polarized antenna array to adjust a phase of the electromagnetic wave signal emitted by the multi-channel dual-polarized antenna array.