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Double-narrow-band liquid crystal tunable metamaterial wave absorber based on magnetic control

A technology of wave absorbers and metamaterials, applied in optics, instruments, electrical components, etc., can solve the problems of large structural unit size, small Q value, poor angular stability, etc., achieve high Q value, narrow bandwidth, increase the equivalent effect of length

Pending Publication Date: 2022-01-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing liquid crystal metamaterial absorbers have small Q values ​​and large structural unit sizes (resulting in poor angular stability), which greatly limits the application scenarios.

Method used

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  • Double-narrow-band liquid crystal tunable metamaterial wave absorber based on magnetic control
  • Double-narrow-band liquid crystal tunable metamaterial wave absorber based on magnetic control
  • Double-narrow-band liquid crystal tunable metamaterial wave absorber based on magnetic control

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Embodiment 1

[0029] Embodiment 1: A magnetron-based double narrow-band liquid crystal tunable metamaterial absorber of this embodiment is formed by periodic arrangement of structural units, and the structural units are composed of top-layer dielectrics stacked sequentially from top to bottom Plate 1, metal structure layer 2, liquid crystal layer 3, metal base plate 4 and bottom dielectric plate 5, wherein the metal structure layer 2 is composed of concentric rectangular metal ring 2-1 and fractal metal ring 2-2, fractal metal ring 2-2 is located inside the rectangular metal ring 2-1. The fractal metal ring 2-2 is a structure formed by bending the middle sections of each side of the rectangular ring toward the center of the rectangle to form a right-angled U shape. The fractal metal ring 2-2 The outline is rectangular;

[0030] The shape of the top dielectric plate 1 is a rectangle, and the side length of the rectangle is P 1 =P 2 =6mm, thickness h=508μm, material is Rogers 5880;

[0031...

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Abstract

The invention discloses a double-narrow-band liquid crystal tunable metamaterial wave absorber based on magnetic control. The invention belongs to the technical field of microwave device engineering, and aims to solve the technical problems of low Q value and large structural unit size of a conventional liquid crystal tunable metamaterial wave absorber. A double-narrow-band liquid crystal tunable metamaterial wave absorber based on magnetic control is formed by regularly arranging structural units, and each structural unit is composed of a top layer dielectric plate, a metal structure layer, a liquid crystal layer, a metal bottom plate and a bottom layer dielectric plate which are sequentially arranged in a stacked mode from top to bottom. The metal structure layer is composed of a rectangular metal ring and a fractal metal ring which are concentric, the fractal metal ring is located in the rectangular metal ring, the fractal metal ring is of a structure formed by bending the middle section of each edge of the rectangular ring towards the center of the rectangle to form a right-angle U shape, and the outline of the fractal metal ring is rectangular.

Description

technical field [0001] The invention belongs to the technical field of microwave device engineering, and in particular relates to a magnetron-based double-narrow-band liquid crystal tunable metamaterial absorber. Background technique [0002] Absorbers can absorb electromagnetic waves, thereby reducing the radar cross section or realizing electromagnetic stealth, and are widely used in the fields of antennas, radars, and wireless communications. Compared with traditional absorbers, metamaterial absorbers have the advantages of low cost, miniaturization and low profile. Tunable functions can be achieved by loading varactors, graphene or liquid crystals in the structural units of metamaterial absorbers. The advantages of varactor diodes are large tuning range and fast tuning speed, but due to the influence of package lead inductance, they can only work in the microwave low frequency band (below X-band). Although graphene can work in the band above Ku, but limited by the prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q17/00H01Q15/00G02F1/13
CPCH01Q17/00H01Q15/00G02F1/13
Inventor 吕剑锋曲成刚朱忠博李小军孟繁义
Owner HARBIN INST OF TECH
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