Three-dimensional broadband wave-absorbing metamaterial integrating multiple absorption mechanisms

Abstract

The invention belongs to the technical field of electromagnetic functional materials, and particularly relates to a three-dimensional broadband wave-absorbing metamaterial integrating multiple absorption mechanisms. The three-dimensional broadband wave-absorbing metamaterial is an array of three-dimensional metamaterial units, each row at least comprises two three-dimensional metamaterial units, and each column at least comprises two three-dimensional metamaterial units; each three-dimensional metamaterial unit comprises an upper-layer dielectric plate, a lower-layer dielectric plate and a metal bottom plate which are sequentially arranged from top to bottom, a high-magnetic-loss material plate is embedded in the center inside the lower-layer dielectric plate, and the lower surfaces of the lower-layer dielectric plate and the high-magnetic-loss material plate are tightly attached to the upper surface of the metal bottom plate; a conductor core is embedded in the center inside the upper dielectric plate, and the lower surfaces of the conductor core and the upper dielectric plate cling to the upper surface of the lower dielectric plate. The conductor core is introduced into an all-dielectric metamaterial, and materials with different loss capacities are used at different parts, so that the prepared wave-absorbing metamaterial simultaneously has the loss mechanisms of a traditional metamaterial and a stepped all-dielectric metamaterial, and the use of high-loss materials can be reduced while the effective absorption bandwidth is expanded.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic functional materials, and in particular relates to a three-dimensional broadband microwave-absorbing metamaterial integrating multiple absorption mechanisms, which can be used for broadband microwave absorption. Background technique [0002] Traditional metamaterial absorbers mainly absorb waves through the electromagnetic resonance of the metamaterial metal structure. When the electromagnetic wave is incident on the surface of the metamaterial structure, the electric field makes the surface metal array play the role of an electric resonator, and the magnetic field makes the surface metal array and the bottom layer The metal substrate functions as a magnetic resonator. By adjusting the unit shape and structural parameters of the metal array, the metamaterial absorber can match the impedance of the free space at the resonant frequency, so as to minimize the reflection of the incident electr...

AI Technical Summary

Problems solved by technology

Although this type of metamaterial is easier to achieve broadband absorption, it has high requirements on the loss capability of the dielectric material itself, which is not conducive to industrial promotion and application.

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