Metamaterial Absorber Device with Multi-band Microwave Tunable Absorption

Abstract

The invention relates to a multi-band microwave adjustable absorption type metamaterial absorption device. A rotary control frame base, a rotary control keel frame and a rotary control frame top coverare fixedly installed to form an upper-layer frame and a lower-layer frame. A microwave absorber set is composed of a plurality of cylindrical microwave absorbers. Each microwave absorber is insertedinto a corresponding hole groove in the rotary control frame basefrom a round hole in the rotary control frame top cover, so that the microwave absorbers are vertically arranged in the space next toone another in a linear mode. A rotary control knob drives each microwave absorber in the microwave absorber set to synchronously rotate through a rack. An asymmetric structure based on a resonant ring is designed in each microwave absorber. A liquid or solid metal material is used for filling a spare space in each microwave absorber. The device not only can perform frequency switching through a rotation angle, but also can realize single-band and multi-band perfect absorption by changing the number and positions of the openings of the resonant ring. The problem that the existing metamaterialabsorber can only respond to a specific band can be solved.

Description

technical field [0001] The invention relates to the field of microwave metamaterials, in particular to a multi-band microwave adjustable absorption metamaterial absorption device. Background technique [0002] A metamaterial is an artificially engineered composite structure or composite material with unique properties not found in natural materials. The singular properties of metamaterials include negative refraction, inverse Doppler effect, perfect lens effect, etc. Due to these novel properties, metamaterials have many unprecedented new applications in many fields, such as antennas, phase imaging, absorbers , spectral detection and stealth technology and other fields. [0003] The perfect metamaterial absorber was first proposed by Landy et al., which can achieve nearly 100% perfect absorption of specific frequencies. Its unit structure includes a metal resonant ring on the top layer, a dielectric isolation layer in the middle, and a narrow-band metal at the bottom. The ...

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Problems solved by technology

[0004] The present invention is aimed at the problem that the existing metamaterial absorber can only perfectly respond to a specific frequency band, and the cost of multi-frequency response is high and the process is complicated. A metamaterial absorber with multi-band microwave adjustable absorption is proposed. Rotating the angle of the device can realize the dynamic control of the incident electromagnetic wave, and it is simple to manufacture, low in cost and easy to operate

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