Tunable ultra wide band wave absorption device for multi-layer bracket structure

Abstract

The invention discloses a tunable ultra wide band wave absorption device for a multi-layer bracket structure. The tunable ultra wide band wave absorption device structurally comprises a bottom layer metal reflecting plate, a dielectric substrate above the metal plate, three square ring plasma resonance structures on the dielectric substrate, tree branch-shaped solid plasma resonance units in the dielectric substrate, triangular annular plasma resonance units among which resistors are connected in a spanning manner and conical solid plasma resonance units which are connected with the resonancestructures, wherein resistors are connected between two square rings in the spanning manner. The absorption device has very good absorption effect to TE polarized waves and controls an excitation region of the resonance units formed by solid plasmas through a programming manner, so that excitation to different resonance units can be realized, the purpose of dynamically regulating different frequencies of the absorption device is achieved, and ultra wide band absorption of the wave absorption device is realized; and in addition, the working frequency of the wave absorption device can cover multiple electromagnetic wave bands under the condition of proper selection of the excitation region, and absorption of lower frequency electromagnetic waves can also be realized in lower physical size.

Description

technical field [0001] The invention relates to a novel tunable ultra-broadband wave absorber with a multi-layer support structure, belonging to the technical fields of radio communication and microwave devices. Background technique [0002] Metamaterial is an artificially manufactured periodic dielectric or metal array, and the microstructure of metamaterial is much smaller than its working wavelength. Due to the unique electromagnetic properties of metamaterial, it is used in electromagnetic stealth of military equipment, electromagnetic protection of civilian equipment, etc. It has broad application prospects in many fields. An important application of electromagnetic metamaterials in electromagnetics is the generation of electromagnetic metamaterial absorbers. The resonant absorption characteristics of metamaterial wave absorbers show broad application prospects in the field of microwave absorption. Different geometric structures require specific electromagnetic wave po...

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Problems solved by technology

The resonant absorption characteristics of metamaterial wave absorbers show broad application prospects in the field of microwave absorption. Different geometric structures require specific electromagnetic wave polarization methods, and the resonant frequency band is very narrow, which limits the ability of metamaterials to a certain extent. The practical application of the absorber, but the existing metamaterial absorber can only effectively absorb the electromagnetic wave of a specific frequency, and the absorption bandwidth is very narrow, so the design of the tunable ultra-wideband absorber is extremely urgent and necessary In addition, it is difficult to obtain a tunable absorption spectrum for a metamaterial absorber in the traditional sense. To obtain a tunable absorption spectrum, a large number of lumped components have to be introduced, the control circuit is complicated, and it is not conducive to integrated and chip-based integrated manufacturing.

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