Artificial super-surface electromagnetic wave amplitude modulator based on graphene

An amplitude modulation and metasurface technology, applied in electrical components, antennas, etc., can solve the problems of relatively narrow operating bandwidth, poor practicability, and low modulation bandwidth, and achieve the effects of widening the modulation bandwidth, convenient modulation, and stable modulation.

Active Publication Date: 2017-11-07
XIDIAN UNIV
View PDF5 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, many artificial electromagnetic metasurface structures can realize the modulation of electromagnetic wave amplitude, but considering factors such as modulation bandwidth and modulation amplitude, their modulation results are not completely satisfactory, and there is still a lot of room for improvement in their modulation amplitude and bandwidth.
For example, in 2012, Sensale-Rodriguez et al. published "Extraordinary Control of Terahertz Beam Reflectance in Graphene Electro-absorption Modulators" in the NANO LETTERS journal (2012,12(9):4518-4522.), in which the electrically tuned single-layer graphite was used The method of Graphene realizes the design of reflective terahertz wave amplitude modulator. The surface structure of the modulator is only composed of a graphene film. This structure overcomes the problem of small amplitude modulation range, but the relative operating bandwidth of the modulator is 10%, the modulation bandwidth is relatively narrow
In 2014, David S. Jessop et al. published "Low-bias terahertz amplitude modulator based on split-ringresonators and graphene" in American Chemical Society journal (2014,8(3):2548-2554.), in which split-ring resonators and graphene were used The composite structure of graphene superposition can dynamically modulate the reflected wave intensity by adjusting the bias voltage of the metamaterial, but the modulation depth of the modulator is only 18%, the amplitude modulation range is small, and the modulation bandwidth is lower than 20%, and the relative working bandwidth is very narrow , which will limit the scope of application of this modulator, and the practicability is not good enough
On the one hand, the modulation bandwidth of this type of modulator designed in the prior art is narrow, and it is difficult to meet the modulation of a wide frequency range; on the other hand, its modulation method is not convenient and flexible enough, and the amplitude modulation range is very small, which greatly affects the modulation effect

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Artificial super-surface electromagnetic wave amplitude modulator based on graphene
  • Artificial super-surface electromagnetic wave amplitude modulator based on graphene
  • Artificial super-surface electromagnetic wave amplitude modulator based on graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] As modulators based on artificial metasurfaces are more and more widely used in wireless communication and electromagnetic stealth, there are higher requirements for the structure, modulation method and modulation effect of the modulator. However, the modulation bandwidth of this type of modulator designed in the prior art is narrow, the modulation method is not flexible enough, and the amplitude modulation range is small, which greatly affects the modulation effect.

[0020] Aiming at the defects of the prior art, the present invention proposes a graphene-based artificial metasurface electromagnetic wave amplitude modulator through experiments and research. The present invention includes a DC power supply 2, a frequency selective surface 4 and a dielectric substrate 3 stacked sequentially from top to bottom And the reflector 1, the frequency selective surface 4 is a metal surface structure arranged periodically, see figure 1 , the dielectric substrate 3 of the present ...

Embodiment 2

[0023] The overall composition and specific structure of the graphene-based artificial metasurface electromagnetic wave amplitude modulator are the same as embodiment 1, see figure 2 , the specific structure of the metal patch 41 embedded with the graphene film 42 is that the metal patch 41 is a metal rectangular ring, and the central gap of the metal rectangular ring is embedded with the graphene film 42; the width w of the graphene film 42 3 Greater than or equal to metal patch 41 outer ring width w 1 1 / 3 of.

[0024] The invention embeds a graphene film in the traditional metal patch structure, and replaces the traditional lumped element with the graphene film, so that the structure is simpler and the modulation process is more convenient and stable.

Embodiment 3

[0026] The overall composition and specific structure of the graphene-based artificial metasurface electromagnetic wave amplitude modulator are the same as in Embodiment 1-2, and the upper and lower sides of the metal patch 41 are connected with two metal branches 43, and the specific structure is that the upper and lower two metal branches 43 are exactly the same And they are all rectangular metal branches, the width w of the rectangular metal branches 43 2 With metal patch 41 outer ring width w 1 similar.

[0027] In the present invention, the rectangular metal branch 43 is connected to the upper and lower sides of the metal patch 41 embedded with the graphene film 42, and the width w of the graphene film 42 is 3 Greater than or equal to metal patch 41 outer ring width w 1 1 / 3 of the width w of the rectangular metal branch 43 2 With metal patch 41 outer ring width w 1 Approximate, the so-called close refers to being equal or approximately equal in value, and ensuring tha...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides an artificial super-surface electromagnetic wave amplitude modulator based on graphene, and mainly solves the problems of small modulation scope and narrow modulation bandwidth of a conventional electromagnetic wave amplitude modulator. The artificial super-surface electromagnetic wave amplitude modulator comprises a DC power supply and a frequency selection surface, three layers of dielectric substrates and a reflecting plate laminated from top to bottom sequentially, wherein a dielectric layer with relative dielectric constant less than three is arranged between the second dielectric layer and a reflecting plate to expand wave absorption bandwidth, the frequency selection surface is formed by m*n cross period units, a rectangular-ring metal paster embedded in a graphene film is arranged in the center of each cross period unit, metallic branches are connected to the upper and lower sides of the rectangular-ring metal paster, and the horizontal metallic fine leads connect the single cross units in an entire row into one body. The structure is simple, and metal pasters embedded in the graphene films are used to widen the modulation bandwidth and increase the reflection wave modulation amplitude. The reflecting plate with high conductivity is used to reduce the transmission of electromagnetic waves by a wave absorption device. The artificial super-surface electromagnetic wave amplitude modulator is applicable to active electromagnetic hiding and electro-optical switch equipment.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic stealth, and mainly relates to an amplitude modulator, in particular to a graphene-based artificial metasurface electromagnetic wave amplitude modulator, which can be used for active electromagnetic stealth and electro-optic switch equipment. Background technique [0002] Graphene is a honeycomb two-dimensional film material composed of a single layer of hexagonal primitive cells of carbon atoms. It has a unique two-dimensional structure and a zero-gap electronic energy band. It has extremely high electron and hole mobility, excellent mechanical Electrical, optical properties and good conductivity tunable characteristics, suitable for optical devices and transparent electromagnetic devices, such as polarizers, filters, reflectors, modulators and surface plasmon polariton (SPP) transmitters, etc. , is a new material with adjustable performance and great potential. [0003] The artificial e...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/14
CPCH01Q15/148
Inventor 吴边李慧玲赵雨桐张伟贺连星
Owner XIDIAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap