Wide-passband 3D frequency selection surface

Abstract

The invention discloses a wide-passband 3D frequency selection surface, and aims to improve the angle stability of the wide-passband 3D frequency selection surface. The wide-passband 3D frequency selection surface comprises mXn passive resonance units; each resonance unit comprises five layers of dielectric plates and four metal layers; each metal layer comprises four trapezoidal annular structures on the upper surface of the upper layer of the dielectric plate and the lower surface of the lower layer of the dielectric plate; the upper surface and the lower surface of the intermediate layer ofthe dielectric plate surround a square metal ring structure formed by the four edges of the dielectric plate, and two groups of 2X2 square ring structures in a square metal ring; the centers of the first group of the square ring structures are located at the four opposite corners of the dielectric plate; the centers of the second group of the ring structures are located on the center points of the center connecting lines of the adjacent first group of the ring structures; and the trapezoidal annular structures on the upper surface of the upper layer of the dielectric plate and the lower surface of the lower layer of the dielectric plate are correspondingly connected through lead wires. According to the structure, the angle stability is improved while edge steep drop and wide passband arerealized, so that the wide-passband 3D frequency selection surface can be applied to the situation of large incident angles and can be applied to the aspects of communication and radars.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to a frequency selective surface, in particular to a frequency selective surface with a stable angle of 3D structure and wide passband, which can be used in the technical field of wireless communication. Background technique [0002] Frequency Selective Surface (FSS) is a two-dimensional periodic structure composed of periodic arrangements of resonant units. It does not absorb energy itself, but it can function as a filter. It is essentially a spatial filter. Its response characteristics vary with frequency, showing transmission characteristics for incident electromagnetic waves in certain frequency bands, and hindering characteristics for incident electromagnetic waves in other frequency bands. The electromagnetic wave filter function in the open space presented by the frequency selective surface makes it have great application value in the fields of science and engineering, and has...

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Problems solved by technology

However, as the incident angle of the incident electromagnetic wave increases, the equivalent electrical length of the structure becomes smaller, and the resonance effect at high frequencies will weaken, and after the incident angle increases, the regular hexagonal metal wall structure affects the transmission in the passband, Under the irradiation of the incident wave at 30°, the transmission parameters are obviously concave in the passband, and the S21 is less than -3dB, which cannot meet the large incident angle and the working characteristics of the wide passband in the middle of the stopbands on both sides.

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