A Gravity Field Tunable Ultra-Wideband Absorber Based on Liquid Metal

Abstract

The invention discloses a gravity field tunable ultra-wide-band wave-absorbing device based on liquid metal. The structure of the device comprises an underlying metal reflecting plate and a multi-layer structure above a metal plate, wherein the multi-layer structure comprises two dielectric substrates, resonance units and glass containers, each resonance unit is coated with a high resistance surface above the corresponding dielectric substrate, and each glass container is arranged above the corresponding resonance unit. The containers are connected through a cylindrical glass cavity, and the volume of liquid accommodated inside each container is equal to that of liquid metal accommodated inside each container. The wave-absorbing device has a preferable absorbing effect for TE polarized waves and TM polarized waves, the resonance units above the dielectric substrates are coated with the high resistance surfaces, ultra-wide-band absorption of the wave-absorbing device can be realized, and by overturning the wave-absorbing device, under the effect of a gravity field, liquid metal mercury is transferred inside the containers to form the different resonance units, so that dynamic control for the absorbing frequency domain of the wave-absorbing device is realized, and the working frequency domain can be dynamically covered with a plurality of working frequency bands. The wave-absorbing device has the characteristics of wide frequency band coverage area, wide application range, convenient control measures, flexible design, high functionality and the like.

Description

technical field [0001] The invention relates to an ultra-broadband wave absorber, in particular to a gravity field tunable ultra-broadband wave absorber based on liquid metal, and belongs to the technical fields of liquid metal mercury practical technology and reconfigurable microwave devices. Background technique [0002] As a new artificial electromagnetic material or composite structure, electromagnetic metamaterials are composed of periodic arrangement and combination of subwavelength unit structures. By orderly designing electromagnetic metamaterials in structure, the control of incident electromagnetic waves can be realized, thereby Realize the abnormal physical properties that the substances in nature do not have. With the development of science and technology and the deepening of research on metamaterials in recent years, people's exploration of metamaterials has also expanded from the initial negative refractive index to optical perfect absorption, sub- With many ap...

AI Technical Summary

Problems solved by technology

However, it is difficult to obtain a tunable broadband absorption spectrum for the metamaterial absorber in the traditional sense. At the same time, the control means of the tunable metamaterial absorber are relatively complicated, and the control accuracy may not be accurate enough.

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