A three-dimensional broadband wave-absorbing metamaterial integrating multiple absorption mechanisms

Abstract

The invention belongs to the technical field of electromagnetic functional materials, and specifically relates to a three-dimensional broadband absorbing metamaterial integrating multiple absorption mechanisms; the three-dimensional broadband absorbing metamaterial is an array of three-dimensional metamaterial units, and each row includes at least two Each column also includes at least two three-dimensional metamaterial units; the three-dimensional metamaterial unit includes an upper dielectric plate, a lower dielectric plate and a metal bottom plate arranged in sequence from top to bottom, and the inner center of the lower dielectric plate is embedded There are high magnetic loss material plates, and the lower surfaces of the two are close to the upper surface of the metal base plate; a conductor core is embedded in the center of the upper dielectric plate, and the lower surfaces of the two are close to the upper surface of the lower dielectric plate. By introducing a conductor core into the all-dielectric metamaterial and using materials with different loss capabilities in different parts, the prepared wave-absorbing metamaterial has both the loss mechanism of the traditional metamaterial and the stepped all-dielectric metamaterial, and can effectively absorb bandwidth while reducing the use of high-loss materials.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic functional materials, in particular to a three-dimensional broadband wave absorbing metamaterial integrating multiple absorption mechanisms, which can be used for broadband microwave absorption. Background technique [0002] The traditional metamaterial absorber mainly absorbs the wave 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 electrical 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 be matched with the impedance of the free space at the resonant frequency, so as to minimize the reflection of incident electro...

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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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