▎ 摘　　要

NOVELTY - A window comprises a light window comprising a graphene layer, a transparent medium layer (A), an electrically-controlled adjustable frequency selection surface layer (L1) which integrates phase-change materials, overlapped and arranged in parallel, a transparent medium layer (B), and the metal grid layer. The layer (L1) comprises a frequency selection surface comprising metal electrodes, and leads connected with electrodes, provided on the edge portions of the metal surface on both sides of the metal surface. The length and width of the electrodes are greater than the length and width of the cross-section of the lead and communicates with the metal portion of the selection surface. The frequency selective surface comprises a gridded aperture-type frequency selective surface (s1), gridded patch-type frequency selective surface (s2), and the phase change material patch (s3), and excludes an overlap between the frequency selective surface, and the surface. USE - Window used for absorbing microwaves. ADVANTAGE - The window has excellent optical transparency and adjustable reflection frequency band. DETAILED DESCRIPTION - A window comprises a light window comprising a graphene layer, a transparent medium layer (A), an electrically-controlled adjustable frequency selection surface layer (L1) which integrates phase-change materials, overlapped and arranged in parallel, a transparent medium layer (B), and the metal grid layer. The layer (L1) comprises a frequency selection surface comprising metal electrodes, and leads connected with electrodes, provided on the edge portions of the metal surface on both sides of the metal surface. The length and width of the electrodes are greater than the length and width of the cross-section of the lead and communicates with the metal portion of the selection surface. The frequency selective surface comprises a gridded aperture-type frequency selective surface (s1), gridded patch-type frequency selective surface (s2), and the phase change material patch (s3), and excludes an overlap between the frequency selective surface, and the surface. The frequency selective surface comprises (mx n) frequency selective surface array units of the integrated phase change material which are periodically and closely arranged, where m and n are 2 or more. When the frequency selective surface array unit contains only one surface (s1), at least one phase change material patch connects the surfaces (s1) and (s2). When the frequency selective surface array unit contains surfaces (s1), directly connects to at least the (s1) through surface (s3), or at least connected to another surface (s1) through at least one phase change material patch (s3) and indirectly connected to the gridded aperture type frequency selective surface. The total area ratio of the phase change material patch is less than 0.04. The surface (s1) is a metal grid comprising aperture units arranged periodically in a two-dimensional array, in which the width of the metal lines remaining at the edge of the aperture unit is greater than or equal to the width of the metal grid lines to maintain the edge shape characteristics, a patch unit comprising metal grids arranged on the surface of the substrate according to the two-dimensional array periodic arrangement, in which metal lines are kept at the edge of the patch unit with a width greater than or equal to the width of the metal grid lines to maintain the edge shape characteristics. The metal grid is a grid-type fine metal structure composed of grid units arranged in a two-dimensional array. The phase change material is a material that realize a reversible change from an insulated state to a metallic state under the drive of temperature, and the temperature at which an insulated state to a metallic state is realized is a phase transition temperature. The total area ratio t of the phase change material patch (s3) is ratio of the total area of the material patch (s3) to the area of the frequency selective surface array unit. The metal grid layer (11) is composed of a metal grid. When the frequency band is electrically controllable and adjustable, the electronically adjustable frequency selection surface layer of the integrated phase-change material does not generate heat when the high-transmittance microwave absorption optical window is not powered on, the phase-change material is in an insulating state, and the optical window is microwave specified frequency band reflector in the band. When the lead wire starts to be energized, the layer (L1) of the integrated phase change material starts to heat up. When it heats up to the phase change temperature, the phase change material becomes metallic, and the reflection band of the optical window produces frequency shift.