3results about How to "Good polarization stability" patented technology

The invention provides a dual-passband adjustable spatial filtering periodic structure, and belongs to the technical field of electromagnetic metamaterials. Comprising an upper metal unit layer, a middle dielectric layer and a lower metal feeder unit layer, the upper metal unit layer and the lower metal feeder layer are both of a periodic structure; four aperture rings are etched in each period of the upper metal unit layer, and the four aperture rings are distributed on four quadrants; the four aperture rings have two sizes, and the sizes of the aperture rings on the same diagonal line are the same; four active lumped elements are loaded on each aperture ring in a central axis symmetric manner; the center of the aperture ring is electrically connected with the lower metal feeder unit layer through a metal via hole; each period of the lower metal unit layer is of a cross-shaped metal patch structure, the metal via holes are connected with the cross-shaped metal patches through the metal patches, and each metal patch connected with the cross-shaped metal patches and the metal via holes is loaded with a passive lumped inductance element.

This invention belongs to the field of metamaterials technology, specifically relating to an adjustable integrated absorption and reflection metamaterial structure. It includes several basic units arranged in a periodic array. Each basic unit comprises a resonant unit, a dielectric layer, and a reflector layer stacked sequentially. The dielectric layer is deformable to create a cavity between itself and the reflector layer or to fit tightly against it. The resonant unit includes four sequentially connected arc-shaped segments arranged centrally symmetrically. The ends of adjacent arc-shaped segments connect to form sharp corners extending towards the center of the resonant unit, with a gap between opposing sharp corners. This invention offers good reconfigurability, high flexibility, and deformability, allowing for easy adjustment of the state and switching of operating modes according to actual usage needs, achieving broadband absorption or complete reflection functions from 4.9 GHz to 16.3 GHz.

The invention relates to the technical field of communication, in particular to a frequency selective surface structure for a 5G base station and a filtering antenna array of the frequency selective surface structure. The frequency selective surface structure for the 5G base station comprises at least one filtering unit, the filtering unit is in a sheet shape, and the filtering unit comprises an external metal layer, a dielectric substrate, a middle metal layer, another dielectric substrate and another external metal layer which are stacked in sequence; the outer metal layer comprises a plurality of first metal sheets, the first metal sheets are arranged in a square array, the first metal sheets are square metal sheets, aperture windows are formed in the middles of the first metal sheets, gap grooves are formed in the four faces of each first metal sheet, and the aperture windows and the gap grooves are separated through bent connecting parts. According to the frequency selective surface structure for the 5G base station, the requirement of a 5G Massive MIMO antenna base station for a filter in a radio frequency channel can be effectively released, and the frequency selective surface structure has the advantages of being low in loss, wide in scanning angle, good in directional diagram conformality, simple in structure and low in implementation cost.