CN204348919U - A kind of Terahertz wideband encoding random surface - Google Patents
A kind of Terahertz wideband encoding random surface Download PDFInfo
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- CN204348919U CN204348919U CN201520027917.0U CN201520027917U CN204348919U CN 204348919 U CN204348919 U CN 204348919U CN 201520027917 U CN201520027917 U CN 201520027917U CN 204348919 U CN204348919 U CN 204348919U
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Abstract
The utility model discloses a kind of Terahertz wideband encoding random surface.This random surface comprises metal patch layer (1), dielectric layer (2) and metal floor layer (3); Described dielectric layer (2) is positioned between metal patch layer (1) and metal floor layer (3), and dielectric layer (2) is polyimides or other organic high molecular polymer dielectric materials, and thickness is micron dimension; Described metal floor layer (3) is positioned at dielectric layer (2) lower surface, thicknesses of layers be 200 nanometers and more than, for preventing Electromgnetically-transparent; The elementary cell of described metal patch layer (1) is the Minkowski ring of First Order Iterative.The utility model have be easy to design, be easy to the advantages such as processing, broadband, the scattering strength of two-dimensional metallic objective body on back scattering Main way can be effectively reduced in broad frequency band, single layer structure carries out processing and fabricating by standard photolithography techniques, in low scattering surface of Terahertz etc., have important application prospect.
Description
Technical field
The utility model belongs to Novel manual electromagnetic material field, is specifically related to a kind of Terahertz wideband encoding random surface.
Background technology
The Novel manual electromagnetic material related in the utility model refers to a kind of artificial composite structure or the Composite Media with extraordinary physical property not available for natural medium, the object controlling material electromagnetic property is reached by change cellular construction and space arrangement thereof, can be obtained distributing dielectric constant and magnetic permeability more widely, realizes noveler electromagnetic property.
Terahertz (THz) wave frequency range is 0.1THz-10THz, and wave-length coverage is 3mm-0.03mm, corresponding energy range at 0.04-4kJ/mol, at electromagnetic spectrum medium wavelength between the submillimeter region and near-infrared ripple of microwave.With the electromagnetic wave phase ratio of its all band, THz wave has the peculiar properties such as instantaneity, broadband property, high coherence and low energy, and this makes THz wave have great scientific value and wide application prospect.But due to the many materials of occurring in nature insensitive to terahertz emission, the material expensive of THz wave can be manipulated and rare, the function element of terahertz wave band is deficient, and the maximum advantage of artificial electromagnetic material is just by changing cellular construction and constituent realize required medium parameter, to be expected to exhibit one's skill to the full in the flow of research filling up Terahertz blank.
Summary of the invention
Technical problem: it is simple that the purpose of this utility model is to provide a kind of structure, is easy to make, and can realize a bit, two bits, three bits and with the low scattering random surface in the Terahertz broadband of first-class many bits of encoded effectively simultaneously.By designing the arrangement rule of limited unit kind, also namely coded sequence realizes the Terahertz random surface of specific objective.This random surface by the adjustment to basic cell structure dimensional parameters, can realize the fine setting to unit resonance frequency, and then changes the reflected phase will of incident wave.The change of single size can realize the adjustment of the large phase place of broadband, can realize bit bits of encoded random surface at the most simultaneously.General " individual layer broadband random surface " adopts full random phase, the size of each unit is different in principle, and the utility model adopts a limited number of unit kind, enormously simplify design process, to the research of limited unit kind arrangement rule, namely the optimal design of coded sequence also can realize more excellent effect.
Technical scheme: a kind of Terahertz wideband encoding random surface of the present utility model comprises metal patch layer, dielectric layer and metal floor layer; Described dielectric layer is polyimides or other organic high molecular polymer dielectric materials, and thickness is micron dimension; Described metal floor layer is positioned at dielectric layer lower surface, thicknesses of layers be 200 nanometers and more than, for preventing Electromgnetically-transparent; The elementary cell of described metal patch layer is the Minkowski ring of First Order Iterative.
The Minkowski ring of described First Order Iterative, thickness of dielectric layers t, the metal patch layer elementary cell cycle is p=90 μm, the Minkowski loop wire of First Order Iterative is wide is w, ring structure inner distance is Lin=23 μm, and the span of gap outer width to be the total length of g=15 and ring be L, L is from 33 μm to 90 μm, as L=33 μm, the Minkowski ring of First Order Iterative deteriorates to Fang Huan; As L=90 μm, adjacent two elementary cells are connected.
The Minkowski ring of described First Order Iterative, when L value is different, the elementary cell of different size has different reflected phase will, unity bit coding is formed close to two kinds of size elementary cells of 180 degree by phase difference in 0.8-1.8THz frequency band, or phase difference is close to four kinds of size elementary cell composition dibit encodings of 90 degree, or phase difference forms three bits of encoded close to eight kinds of size elementary cells of 45 degree, and the elementary cell of more sizes forms the coding of more higher bit number, the random irregular arrangement of each elementary cell.
Described metal patch layer, its elementary cell arrangement mode, utilizes the optimized algorithms such as particle cluster algorithm (PSO) to be optimized.
Beneficial effect: compared with prior art, advantage of the present utility model:
1. the utility model makes simple, easy to process.The First Order Iterative Minkowski ring structure that the utility model uses, layer of metal patch layer can realize large phase shift range.A limited number of unit kind also greatly simplify design process.Single layer structure carries out processing and fabricating by standard photolithography techniques, saves cost, it also avoid the mismachining tolerance that sandwich construction alignment causes.
2. the utility model has ultra broadband characteristic.Be different from general artificial electromagnetic material, be applied on the resonance frequency of cellular construction, operating frequency is limited near resonance frequency, and bandwidth is narrower.The utility model utilizes the cellular construction acting in conjunction of out of phase difference to cause scattering phase to disappear significantly to reduce the scattering strength on back scattering Main way, avoids the restriction of resonance frequency, has greatly widened working band.
3. the utility model also has good inhibitory action to the back scattering of large-angle inclined incident electromagnetic wave.Complex electromagnetic environment in practical application, oblique incidence is more more general than normal incidence, and therefore the utility model can adapt to complex electromagnetic environment preferably.
4. the utility model possesses portable, lightweight, flexibility ratio advantages of higher simultaneously.Gross thickness, in micron dimension, is easy to conformal, has more general application value.
Accompanying drawing explanation
Fig. 1 a is Terahertz wideband encoding random surface individual unit structure, the front view of First Order Iterative Minkowski ring,
Fig. 1 b is the size marking figure of Terahertz wideband encoding random surface individual unit structure, illustrated therein is the period p of basic cell structure in the utility model, and the Minkowski loop wire of First Order Iterative is wide is w, and ring structure inner distance is L
in, gap outer width is the total length of g and ring is L.
Fig. 1 c is Terahertz wideband encoding random surface individual unit structure, the end view of First Order Iterative Minkowski ring.
Fig. 2 is electromagnetic wave normal incidence and fixed cell parameter: p=90 μm, w=5 μm, L
in=23 μm, during g=15 μm, in different size parameter L situation, the reflection amplitudes of emulation and reflected phase will and frequency relation.
Fig. 3 be electromagnetic wave normal incidence and frequency is 1.4THz time, the reflected phase will of First Order Iterative Minkowski ring element and the relation of dimensional parameters L; Indicate simultaneously and can obtain phase difference close to two kinds of size elementary cells (unity bit coding) of 180 degree simultaneously, or phase difference is close to four kinds of size elementary cells (dibit encoding) of 90 degree, or phase difference is close to eight kinds of size elementary cells of 45 degree.
The random surface figure of Fig. 4 a unity bit coding and partial enlarged drawing,
The random surface figure of Fig. 4 b dibit encoding and partial enlarged drawing,
The random surface figure of Fig. 4 c tri-bits of encoded and partial enlarged drawing.
A normalized bit, three bits of encoded random surfaces and the dull and stereotyped simulation result at 0.8THz to 2.0THz frequency range reflection coefficient of simple metal without random surface under Fig. 5 electromagnetic wave normal incidence condition.
Normalized dibit encoding random surface and without the dull and stereotyped emulation at 0.8THz to 2.0THz frequency range reflection coefficient of simple metal of random surface and experimental result under Fig. 6 a electromagnetic wave normal incidence condition,
Under Fig. 6 b electromagnetic wave 20 ° of oblique incidence conditions, the reflection coefficient experimental result of normalized dibit encoding random surface and the dull and stereotyped direction of mirror image in 0.5THz to 1.6THz frequency range of simple metal without random surface,
Under Fig. 6 c electromagnetic wave 30 ° of oblique incidence conditions, the reflection coefficient experimental result of normalized dibit encoding random surface and the dull and stereotyped direction of mirror image in 0.5THz to 1.6THz frequency range of simple metal without random surface,
Under Fig. 6 d electromagnetic wave 40 ° of oblique incidence conditions, the reflection coefficient experimental result of normalized dibit encoding random surface and the dull and stereotyped direction of mirror image in 0.5THz to 1.6THz frequency range of simple metal without random surface.
Reference numeral:
1-metal patch layer; 2-dielectric layer; 3-metal floor layer.
Embodiment
The Terahertz wideband encoding random surface that the utility model proposes is by keeping the First Order Iterative Minkowski ring structure of basicly stable different size as coding unit at broad frequency band internal reflection phase difference, form according to certain rule arrangement, the scattering strength reduced on back scattering Main way obtains low scattering Terahertz surface.The bit, two bits and the three bits of encoded random surfaces that are formed with the First Order Iterative Minkowski ring elementary cell of different size below, for example, are further described the utility model by reference to the accompanying drawings.
Fig. 1 is Terahertz wideband encoding random surface First Order Iterative Minkowski ring structure.Fig. 1 a is front view, and Fig. 1 c is end view, and Fig. 1 b is the size marking figure to elementary cell, illustrated therein is the period p of basic cell structure in the utility model, and the Minkowski loop wire of First Order Iterative is wide is w, and ring structure inner distance is L
in, gap outer width is the total length of g and ring is L.
Fig. 2 is electromagnetic wave normal incidence and fixed cell parameter: p=90 μm, w=5 μm, L
in=23 μm, during g=15 μm, in different size parameter L situation, the reflection amplitudes of emulation and reflected phase will and frequency relation.Can find out in figure, when L changes from 43 μm to 78 μm, reflected phase will curve is substantially parallel in frequency range from 0.7THz to 1.8THz, and phase range can reach 315 ° and more than.Reflection amplitudes fluctuations in 0.8THz to 1.8THz scope is less, and changes greatly when upper frequency.The random surface that this basic cell structure of this behavioral illustrations is formed has good broadband character.
Fig. 3 be electromagnetic wave normal incidence and frequency is 1.4THz time, the reflected phase will of First Order Iterative Minkowski ring element and the relation of dimensional parameters L; Indicate simultaneously and can obtain phase difference close to two kinds of size elementary cells (unity bit coding) of 180 degree simultaneously, or phase difference is close to four kinds of size elementary cells (dibit encoding) of 90 degree, or phase difference is close to eight kinds of size elementary cells of 45 degree.
Fig. 4 a, Fig. 4 b and Fig. 4 c are random surface figure and the partial enlarged drawing of a bit, two bits and three bits of encoded respectively.This embodiment shown in figure is the big unit being made up of 3*3 the elementary cell of each size, then with 28*28 big unit composition coding random surface.The Terahertz wideband encoding random surface obtained is of a size of 7.56mm*7.56mm, totally 7056 First Order Iterative Minkowski ring elementary cells.
A normalized bit, three bits of encoded random surfaces and the dull and stereotyped simulation result at 0.8THz to 2.0THz frequency range reflection coefficient of simple metal without random surface under Fig. 5 electromagnetic wave normal incidence condition.Shown in figure, during normal incidence, one bit, three bits of encoded random surfaces, compared with the simple metal flat board without random surface, have good back scattering rejection ability in 0.8THz to 2.0THz frequency range.
Normalized dibit encoding random surface and without the dull and stereotyped emulation at 0.8THz to 2.0THz frequency range reflection coefficient of simple metal of random surface and experimental result under Fig. 6 a electromagnetic wave normal incidence condition.Shown in figure during normal incidence dibit encoding random surface compared with the simple metal flat board without random surface, emulation and experimental result all show in 0.8THz to 2.0THz frequency range, have good back scattering rejection ability, especially, in 0.8THz to 1.8THz frequency range, on back scattering Main way, scattared energy reduces by more than 90%.
Fig. 6 b, Fig. 6 c and Fig. 6 d respectively illustrate electromagnetic wave under 20 °, 30 ° and 40 ° of oblique incidence conditions, the reflection coefficient experimental result of normalized dibit encoding random surface and the dull and stereotyped direction of mirror image in 0.5THz to 1.6THz frequency range of simple metal without random surface.Experimental result shows, the utility model also has good inhibitory action to the mirror reflection ripple in electromagnetic wave oblique incidence situation.This feature makes the utility model have larger development prospect under practical application.
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 (3)
1. a Terahertz wideband encoding random surface, is characterized in that described random surface comprises metal patch layer (1), dielectric layer (2) and metal floor layer (3); Described dielectric layer (2) is polyimides or other organic high molecular polymer dielectric materials, and thickness is micron dimension; Described metal floor layer (3) is positioned at dielectric layer (2) lower surface, thicknesses of layers be 200 nanometers and more than, for preventing Electromgnetically-transparent; The elementary cell of described metal patch layer (1) is the Minkowski ring of First Order Iterative.
2. Terahertz wideband encoding random surface according to claim 1, it is characterized in that the Minkowski ring of described First Order Iterative, dielectric layer (2) thickness t, metal patch layer (1) the elementary cell cycle is p=90 μm, the Minkowski loop wire of First Order Iterative is wide is w, ring structure inner distance is Lin=23 μm, gap outer width is the total length of g=15 and ring is L, the span of L is from 33 μm to 90 μm, as L=33 μm, the Minkowski ring of First Order Iterative deteriorates to Fang Huan; As L=90 μm, adjacent two elementary cells are connected.
3. Terahertz wideband encoding random surface according to claim 1, it is characterized in that, the Minkowski ring of described First Order Iterative, when L value is different, the elementary cell of different size has different reflected phase will, unity bit coding is formed close to two kinds of size elementary cells of 180 degree by phase difference in 0.8-1.8THz frequency band, or phase difference is close to four kinds of size elementary cell composition dibit encodings of 90 degree, or phase difference forms three bits of encoded close to eight kinds of size elementary cells of 45 degree, and the elementary cell of more sizes forms the coding of more higher bit number, the random irregular arrangement of each elementary cell.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104577350A (en) * | 2015-01-15 | 2015-04-29 | 东南大学 | Terahertz broadband coding random surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104577350A (en) * | 2015-01-15 | 2015-04-29 | 东南大学 | Terahertz broadband coding random surface |
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