CN204680754U - A kind of Terahertz broadband random surface - Google Patents
A kind of Terahertz broadband random surface Download PDFInfo
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- CN204680754U CN204680754U CN201520209034.1U CN201520209034U CN204680754U CN 204680754 U CN204680754 U CN 204680754U CN 201520209034 U CN201520209034 U CN 201520209034U CN 204680754 U CN204680754 U CN 204680754U
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Abstract
The utility model discloses a kind of Terahertz broadband random surface, comprise metal patch layer, dielectric layer and metal floor layer; Described dielectric layer is between metal patch layer and metal floor layer, and dielectric layer is polyimides or other organic high molecular polymer dielectric materials, and thickness is micron dimension; Described metal floor tunic layer thickness be 200 nanometers and more than, make incident wave not transmissive; Described metal patch layer is at the upper surface of dielectric layer, and its elementary cell has groined type structure and two kinds, three-back-shaped structure.In broad frequency band, normalization reflected phase will can cover 0 ~ 360 ° of angle.Whole array is by the unit random alignment of different reflected phase will or form through algorithm optimization.The utility model have be easy to design, be easy to the advantages such as processing, broadband, can effectively reduce the scattering strength of two-dimensional metallic objective body on back scattering Main way in broad frequency band.The utility model is single layer structure, carries out processing and fabricating by standard photolithography techniques, in Terahertz application, have important application prospect.
Description
Technical field
The utility model relates to novel artificial Material Field, is specifically related to a kind of Terahertz broadband random surface.
Background technology
Novel manual electromagnetic material is a kind of artificial composite structure, is rearranged, have the electromagnetic property not available for nature medium by some sub-wavelength unit according to cycle or paracycle.Changed the electromagnetic property in space on Electromagnetic Wave Propagation path by change cellular construction and space arrangement thereof, thus control electromagnetic wave propagation.
Novel manual electromagnetic material surpasses surface and belongs to Novel manual electromagnetic material field, and feature only needs very thin thickness just can complete control to Electromagnetic Wave Propagation.
Utility model content
Technical problem: it is simple that the purpose of this utility model is to provide a kind of structure, is easy to make, effectively can realizes broadband, the low scattering random surface of polarizers of big angle scope incidence.By the adjustment to basic cell structure dimensional parameters, realize the fine setting to unit resonance frequency, the reflected phase will also corresponding change of incident wave.By the diverse location in array surface, choose the unit of different reflected phase will, whole array surface can be allowed to form a kind of similar irreflexive effect to incident wave, allow energy to the reflection of different directions, thus reduce the scattared energy on main scattering direction.
Technical scheme: for solving the problem, herein utility model a kind of Terahertz broadband random surface, comprise the unit battle array that several have different patch size, each unit battle array is made up of several identical resonant elements; Described resonant element comprises metal patch layer, dielectric layer and metal floor layer, and described dielectric layer is between metal patch layer and metal floor layer; Described resonant element has two kinds of structures: the first groined type cellular construction, is that the endless metal belt of groined type surrounds a foursquare sheet metal; The three-back-shaped cellular construction of the second is that the endless metal belt of square shape surrounds a foursquare sheet metal.
Further, the first groined type cellular construction: the unit cycle is a
1=100 μm, thickness of dielectric layers is t=30 μm, and the live width of groined type endless metal belt is d
1=5 μm, the minor matters length of well word is b
1, groined type endless metal belt and central metal square be spaced apart g
1=5 μm; The three-back-shaped cellular construction of the second: the unit cycle is a
2=100 μm, thickness of dielectric layers is t=30 μm, and the live width of three-back-shaped endless metal belt is d
2=5 μm, the length of side of central metal square is b
2, three-back-shaped endless metal belt and center square metal be spaced apart g
2=5 μm; Described b
1value from 5 μm to 20 μm, b
2value, from 12 μm to 21 μm, passes through b
1and b
2change value in prescribed limit forms the unit battle array that several sizes do not wait, and the excursion of the reflected phase will of the unit battle array that several sizes do not wait can cover the scope of 0 ~ 360 ° after normalization.
Further, the material of described dielectric layer is organic high molecular polymer dielectric material, and thickness is micron dimension.
Further, the material of described dielectric layer is polyimides.
Further, the thicknesses of layers of described metal floor layer is 200-250 nanometer.Make electromagnetic wave cannot transmission.
The utility model cellular construction has groined type and three-back-shaped two kinds.After reflected phase will when these two kinds of unit carry out physical dimension fine setting normalizes to 0 ~ 360 degree, the excursion of 0 ~ 360 degree can be covered completely, thus can ideally irreflexive situation in simulating nature circle, incident wave is reflexed to arbitrary direction.In order to make the energy of reflected wave the most equably to all directions reflection, in array, the arrangement mode of different reflected phase will unit battle array can use genetic algorithm to be optimized.
Wherein: b
1and b
2the defining method of value: first by Software Create two-dimensional random matrix, the span of two-dimensional random matrix unit is the integer value in 0 to 360, and this two-dimensional random matrix unit represents the phase value of each unit battle array of random surface; Then, phase place and size b is utilized
1,b
2between numerical relation, obtained the dimension matrix of random surface unit battle array by the two-dimensional random matrix of unit battle array phase place, i.e. b
1,b
2value matrix.
The utility model adjustment resonant element parameter, can control random surface and be operated in other frequency ranges except terahertz wave band.
Several unit battle arrays with different patch size of the utility model form array, and the arrangement mode of several unit battle arrays is random alignment, or are optimized by particle cluster algorithm.The energy of reflected wave is reflected to all directions the most equably.
Beneficial effect: compared with prior art, advantage of the present utility model:
1, the utility model makes simple, easy to process, considers machining accuracy problem, have employed two kinds of cellular constructions, make reflected phase will cover 0 ~ 360 degree of excursion completely.Only use a Rotating fields, conformal special objective of Denging can be realized further, avoid the mismachining tolerance of sandwich construction simultaneously.
2, the utility model working band that utilized multiple resonant structures to widen, the random arrangement of unit produces similar irreflexive effect, scattered wave interference disappears mutually, the intensity on the main scattering direction of back scattering significantly can be reduced when wider bandwidth, the environmental requirement of work is lower, adaptable.
3, the utility model can not only reduce the electromagnetic backscatter intensity of normal incidence, when electromagnetic wave is with larger angle oblique incidence, still has significant inhibitory action.This feature makes the utility model have better stealthy effect, can adapt to practical application better.
Accompanying drawing explanation
The schematic diagram of Fig. 1 a random surface.Fig. 1 b is the schematic diagram of groined type cellular construction.Fig. 1 c is the schematic diagram of three-back-shaped cellular construction.
Fig. 2 a groined type cellular construction in the reflected phase will of centre frequency with the minor matters length b of well word
1the curve of change.The three-back-shaped cellular construction of Fig. 2 b in the reflected phase will of centre frequency with the side length b of central metal square
2the curve of change.Fig. 2 a dash area is that the size that cannot process, replaces with the dash area of Fig. 2 b by current process technology limit.
Fig. 3 a is at a
1=100 μm, b
1=8 μm, g
1=5 μm, d
1when=5 μm, the reflection amplitudes of groined type structure and phase place are with the change curve of frequency.Fig. 3 b is at a
2=100 μm, b
2=20 μm, g
2=5 μm, d
2when=5 μm, the reflection amplitudes of three-back-shaped structure and phase place are with the change curve of frequency.Fig. 3 c be groined type structure and three-back-shaped structure resonance time current diagram.
Fig. 4 a groined type structure when different incidence angles is spent reflected phase will with the curve of frequency change.The three-back-shaped structure of Fig. 4 b when different incidence angles is spent reflected phase will with the curve of frequency change.
During Fig. 5 a incident wave vertical incidence, the simulation result of reflection coefficient.Ordinate be 1 curve be the reflection coefficient with the metal plate of random surface equidimension, ordinate is the reflection coefficient of random surface close to the curve of 0.During Fig. 5 b incident wave vertical incidence, the experimental result of reflection coefficient.Ordinate be 1 curve be the reflection coefficient with the metal plate of random surface equidimension, ordinate is the reflection coefficient of metal structure close to the curve of 0.
When Fig. 6 (a-c) incident wave impinges perpendicularly on random surface, random surface respectively 1,1.4 and 1.7THz time three-dimensional scattering directional diagram.When Fig. 6 (d-f) incident wave impinges perpendicularly on random surface, random surface respectively 1,1.4 and 1.7THz time at the scattering directional diagram of xoy plane.Fig. 6 (g-i) incident wave impinge perpendicularly on the metal plate of the sizes such as random surface on time, random surface respectively 1,1.4 Hes, scattering directional diagram during 1.7THz.Fig. 6 (j-l) incident wave impinge perpendicularly on the metal plate of the sizes such as random surface on time, random surface respectively 1,1.4 and 1.7THz time at the scattering directional diagram of xoy plane.
Fig. 7 random surface sample object figure and work flow schematic diagram.
Fig. 8 contrasts metallic plate and random surface respectively at 20 °, 30 °, 40 °, 50 °, 60 °, 70 °, and the scattering amplitude of 80 ° is with the curve of frequency change.Fig. 8 a incident wave angle is 20 °, and Fig. 8 b incident wave angle is 30 °, and Fig. 8 c incident wave angle is 40 °.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
As shown in Figure 1a, a kind of Terahertz broadband random surface, comprise the unit battle array that several have different patch size, each unit battle array is made up of the resonant element that several shapes are identical; Described resonant element comprises metal patch layer, dielectric layer and metal floor layer, and described dielectric layer is between metal patch layer and metal floor layer; Described resonant element has two kinds of structures: the first groined type cellular construction, is that the endless metal belt of groined type surrounds a foursquare sheet metal; The three-back-shaped cellular construction of the second is that the endless metal belt of square shape surrounds a foursquare sheet metal.
Fig. 1 b is the first groined type cellular construction: the unit cycle is a
1=100 μm, thickness of dielectric layers is t=30 μm, and the live width of groined type endless metal belt is d
1=5 μm, the minor matters length of well word is b
1, groined type endless metal belt and central metal square be spaced apart g
1=5 μm; The three-back-shaped cellular construction of Fig. 1 c the second: the unit cycle is a
2=100 μm, thickness of dielectric layers is t=30 μm, and the live width of three-back-shaped endless metal belt is d
2=5 μm, the length of side of central metal square is b
2, three-back-shaped endless metal belt and center square metal be spaced apart g
2=5 μm; Described b
1value from 5 μm to 20 μm, b
2value is from 12 μm to 21 μm.Pass through b
1and b
2change value in prescribed limit forms the unit battle array that several sizes do not wait, and the excursion of the reflected phase will of the unit battle array that several sizes do not wait can cover the scope of 0 ~ 360 ° after normalization.Thus can perfect irreflexive situation in simulating nature circle, incident wave is reflexed to arbitrary direction.In order to make the energy of reflected wave the most equably to all directions reflection, in array, the arrangement mode of different reflected phase will unit can use genetic algorithm to be optimized.
Fig. 2 a groined type cellular construction in the reflected phase will of centre frequency with the minor matters length b of well word
1the curve of change.The three-back-shaped cellular construction of Fig. 2 b in the reflected phase will of centre frequency with the side length b of central metal square
2the curve of change.Fig. 2 a dash area is that the size that cannot process, replaces with the dash area of Fig. 2 b by current process technology limit.Only use a Rotating fields, conformal special objective of Denging can be realized further, avoid the mismachining tolerance of sandwich construction simultaneously.B
1and b
2the defining method of value: first by Software Create two-dimensional random matrix, the span of matrix unit is the integer value in 0 to 360, and this two-dimensional random matrix unit represents the phase value of each unit battle array of random surface; Then, as shown in Figure 2, phase place and size b is utilized
1,b
2between numerical relation, obtained the dimension matrix of random surface unit battle array by the two-dimensional random matrix of unit battle array phase place.
Fig. 3 a is at a
1=100 μm, b
1=8 μm, g
1=5 μm, d
1when=5 μm, the reflection amplitudes of groined type structure and phase place are with the change curve of frequency.Fig. 3 b is at a
2=100 μm, b
2=20 μm, g
2=5 μm, d
2when=5 μm, the reflection amplitudes of three-back-shaped structure and phase place are with the change curve of frequency.Fig. 3 c be groined type structure and three-back-shaped structure resonance time current diagram.As can be seen from the figure the phase place change produced during range site resonance, regulon size, can realize 360 degree of changes of reflected phase will.
Fig. 4 a groined type structure when different incidence angles is spent reflected phase will with the curve of frequency change.The three-back-shaped structure of Fig. 4 b when different incidence angles is spent reflected phase will with the curve of frequency change.The reflected phase will response of unit A and unit B affects by incident angle hardly, illustrates that the Novel manual electromagnetic material random surface of design is insensitive to incident angle.
During Fig. 5 a incident wave vertical incidence, the simulation result of reflection coefficient.Ordinate be 1 curve be the reflection coefficient with the metal plate of random surface equidimension, ordinate is the reflection coefficient of random surface close to the curve of 0.During Fig. 5 b incident wave vertical incidence, the experimental result of reflection coefficient.Ordinate be 1 curve be the reflection coefficient with the metal plate of random surface equidimension, ordinate is the reflection coefficient of metal structure close to the curve of 0.Contrast display random surface can reduce the electromagnetic backscatter intensity of normal incidence greatly.
When Fig. 6 (a-c) incident wave impinges perpendicularly on random surface, random surface respectively 1,1.4 and 1.7THz time three-dimensional scattering directional diagram.When Fig. 6 (d-f) incident wave impinges perpendicularly on random surface, random surface respectively 1,1.4 and 1.7THz time at the scattering directional diagram of xoy plane.Fig. 6 (g-i) incident wave impinge perpendicularly on the metal plate of the sizes such as random surface on time, random surface respectively 1,1.4 Hes, scattering directional diagram during 1.7THz.Fig. 6 (j-l) incident wave impinge perpendicularly on the metal plate of the sizes such as random surface on time, random surface respectively 1,1.4 and 1.7THz time at the scattering directional diagram of xoy plane.Contrast display, the utility model working band that utilized multiple resonant structures to widen, the random arrangement of unit produces similar irreflexive effect, scattered wave interference disappears mutually, the intensity on the main scattering direction of back scattering significantly can be reduced when wider bandwidth, the environmental requirement of work is lower, adaptable.
Fig. 7 random surface sample object figure and work flow schematic diagram.This random surface comprises metal patch layer, dielectric layer and metal floor layer three-decker; Dielectric layer is between metal patch layer and metal floor layer, and dielectric layer is polyimides or other organic high molecular polymer dielectric materials, and thickness is micron dimension; Metal floor layer is positioned at dielectric layer lower surface, thicknesses of layers be 200 nanometers and more than, make electromagnetic wave cannot transmission.
Fig. 8 contrasts metallic plate and random surface respectively at 20 °, 30 °, 40 °, 50 °, 60 °, 70 °, and the scattering amplitude of 80 ° is with the curve of frequency change.Fig. 8 a incident wave angle is 20 °, and Fig. 8 b incident wave angle is 30 °, and Fig. 8 c incident wave angle is 40 °.Contrast display, the utility model, when electromagnetic wave is with larger angle oblique incidence, still has significant inhibitory action.This feature makes the utility model have better stealthy effect, can adapt to practical application better.
The embodiment that the utility model has combined only for determined number is described in detail out, can it is easily understood that the utility model is not restricted in the disclosed embodiments.More, the utility model can revise merge any amount of aforementioned not mentioned arrive distortion, change, replacement or equivalent assemblies, but these and spirit and scope of the present utility model match.In addition, various embodiment of the present utility model is described out, is understandable that, various aspects of the present utility model only can comprise a part for described embodiment.Thus, the utility model also be can't help aforementioned description and limited, but is only limited by the scope of attached claim.
Claims (5)
1. a Terahertz broadband random surface, is characterized in that: comprise the unit battle array that several have different patch size, each unit battle array is made up of several identical resonant elements; Described resonant element comprises metal patch layer, dielectric layer and metal floor layer, and described dielectric layer is between metal patch layer and metal floor layer; Described resonant element has two kinds of structures: the first groined type cellular construction, is that the endless metal belt of groined type surrounds a foursquare sheet metal; The three-back-shaped cellular construction of the second is that the endless metal belt of square shape surrounds a foursquare sheet metal.
2. Terahertz broadband according to claim 1 random surface, is characterized in that: the first groined type cellular construction: the unit cycle is a
1=100 μm, thickness of dielectric layers is t=30 μm, and the live width of groined type endless metal belt is d
1=5 μm, the minor matters length of well word is b
1, groined type endless metal belt and central metal square be spaced apart g
1=5 μm; The three-back-shaped cellular construction of the second: the unit cycle is a
2=100 μm, thickness of dielectric layers is t=30 μm, and the live width of three-back-shaped endless metal belt is d
2=5 μm, the length of side of central metal square is b
2, three-back-shaped endless metal belt and center square metal be spaced apart g
2=5 μm; Described b
1value from 5 μm to 20 μm, b
2value, from 12 μm to 21 μm, passes through b
1and b
2change value in prescribed limit forms the unit battle array that several sizes do not wait, and the excursion of the reflected phase will of the unit battle array that several sizes do not wait can cover the scope of 0 ~ 360 ° after normalization.
3. Terahertz broadband according to claim 1 random surface, is characterized in that: the material of described dielectric layer is organic high molecular polymer dielectric material, and thickness is micron dimension.
4. Terahertz broadband according to claim 1 random surface, is characterized in that: the material of described dielectric layer is polyimides.
5. Terahertz broadband according to claim 1 random surface, is characterized in that: the thicknesses of layers of described metal floor layer is 200-250 nanometer.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104752840A (en) * | 2015-04-08 | 2015-07-01 | 东南大学 | Terahertz broadband random surface |
| CN106571533A (en) * | 2016-11-07 | 2017-04-19 | 东南大学 | Scattering-controllable random coding meta-surface and control method |
| CN106707382A (en) * | 2016-12-30 | 2017-05-24 | 东莞同济大学研究院 | Photon absorber based on tooth profile structure |
| CN108336501A (en) * | 2018-01-23 | 2018-07-27 | 中国计量大学 | A kind of reflected terahertz hereby wave direction controller |
| CN110148841A (en) * | 2019-05-08 | 2019-08-20 | 南京邮电大学 | A kind of multi-beam scanning array antenna based on solid state plasma |
| CN114976644A (en) * | 2022-06-27 | 2022-08-30 | 华南理工大学 | Heterogeneous phase modulation unit, phase modulation method and heterogeneous reflective array antenna |
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2015
- 2015-04-08 CN CN201520209034.1U patent/CN204680754U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104752840A (en) * | 2015-04-08 | 2015-07-01 | 东南大学 | Terahertz broadband random surface |
| CN104752840B (en) * | 2015-04-08 | 2017-06-06 | 东南大学 | A kind of Terahertz broadband random surface |
| CN106571533A (en) * | 2016-11-07 | 2017-04-19 | 东南大学 | Scattering-controllable random coding meta-surface and control method |
| CN106571533B (en) * | 2016-11-07 | 2019-07-30 | 东南大学 | A kind of super surface of scattering controllable type random coded and control method |
| CN106707382A (en) * | 2016-12-30 | 2017-05-24 | 东莞同济大学研究院 | Photon absorber based on tooth profile structure |
| CN106707382B (en) * | 2016-12-30 | 2022-12-27 | 东莞同济大学研究院 | Light absorber based on tooth-shaped structure |
| CN108336501A (en) * | 2018-01-23 | 2018-07-27 | 中国计量大学 | A kind of reflected terahertz hereby wave direction controller |
| CN108336501B (en) * | 2018-01-23 | 2020-10-30 | 中国计量大学 | Reflected terahertz wave direction controller |
| CN110148841A (en) * | 2019-05-08 | 2019-08-20 | 南京邮电大学 | A kind of multi-beam scanning array antenna based on solid state plasma |
| CN114976644A (en) * | 2022-06-27 | 2022-08-30 | 华南理工大学 | Heterogeneous phase modulation unit, phase modulation method and heterogeneous reflective array antenna |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150930 Termination date: 20180408 |