CN107275792B - Full-angle transparent transmission material of terahertz frequency band - Google Patents
Full-angle transparent transmission material of terahertz frequency band Download PDFInfo
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- CN107275792B CN107275792B CN201710373946.6A CN201710373946A CN107275792B CN 107275792 B CN107275792 B CN 107275792B CN 201710373946 A CN201710373946 A CN 201710373946A CN 107275792 B CN107275792 B CN 107275792B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 58
- 239000000463 material Substances 0.000 title claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 47
- 229910052751 metal Inorganic materials 0.000 claims abstract description 47
- 239000000758 substrate Substances 0.000 claims abstract description 31
- 230000005684 electric field Effects 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 20
- 238000004088 simulation Methods 0.000 description 8
- 230000005284 excitation Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004038 photonic crystal Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
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Abstract
The invention discloses a full-angle transparent transmission material of a terahertz frequency band. The full-angle transparent transmission material is formed by an electromagnetic resonance layer in which an artificial medium electromagnetic resonance unit is electromagnetically coupled through space and is formed on the plane where the electromagnetic resonance unit is located in an array mode; the electromagnetic resonance unit comprises a substrate, a square metal transmission line frame on the plane of the substrate and a circular metal disc at the symmetrical center of the square metal transmission line frame, and can be excited by an electric field and a magnetic field to generate electric resonance and magnetic resonance at the same time when electromagnetic waves are incident; the electromagnetic resonance layer has full transmission characteristics under any incident angle under the condition that the terahertz frequency band electromagnetic wave is incident at any angle. The full-angle transparent transmission material constructed by the invention realizes the construction of the full-angle transparent transmission material of the terahertz waveband by using the artificial medium for the first time, has a simple structure, and can be widely applied to the field of various artificial media.
Description
Technical Field
The invention relates to the field of artificial media, in particular to a full-angle transparent transmission material of a terahertz frequency band in a single-layer planar process structure.
Background
The physical nature of the artificial medium is that the electromagnetic polarization of atoms in the natural medium is simulated through the densely arranged sub-wavelength resonance units so as to obtain specific frequency dispersion in a required frequency band. The scientific community has been devoted to changing the electromagnetic parameters of the medium by changing the structural characteristics of the sub-wavelength resonant cells in order to obtain an equivalent medium with no reflection, i.e. a Perfectly Matched Layer (PML). PML is a hypothetical material model defined mathematically in computational electromagnetics. In 1994, Berenger first proposed the concept of PML, and then was widely used for finite field numerical calculations in the scientific research and engineering fields. Electromagnetic waves of arbitrary polarization enter the interior of the PML without any reflection when they are incident on the PML surface at an arbitrary angle of incidence. When the PML has large loss, the transmitted electromagnetic wave energy can be rapidly absorbed, and the PML becomes an ideal wave-absorbing material; when the PML has a small loss, the transmitted electromagnetic wave energy can exit the PML with almost no loss, and becomes an ideal transparent material. By utilizing the lossless PML concept, the 'self-stealth' of the medium can be obtained, and novel applications such as 'perfect' ideal antenna housing and the like are realized.
At present, a wide-band antenna cover research based on a Frequency Selective Surface (FSS) has been reported, but due to the limitation of a larger unit and a strong anisotropic condition of the FSS, the full-angle transparent transmission characteristic cannot be realized. In 2016, Ph D, university of Zhejiang, by using a 3D printing technology, provides precise control based on electromagnetic parameters of an artificial medium, realizes a lossless artificial PML medium with equivalent dielectric constant and magnetic conductivity close to free space, presents a relative refractive index and wave impedance close to 1 for transverse electric wave (TE) waves with any polarization and any incidence angle, and realizes full-angle transparent transmission of a microwave frequency band. In 2016, the university of Suzhou Hangzhou university professor uses a photonic crystal theory to realize a TE wave full-angle transparent transmission material in a microwave band.
Up to now, the research on the full-angle transparent transmission material is still limited to the microwave frequency band, because the structural size of the microwave frequency band resonance unit is larger than that of the terahertz wave band resonance unit, the processing is easy to realize, and meanwhile, in the microwave frequency band, the intrinsic loss of the material is relatively smaller, and a lossless equivalent medium is easier to realize.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to provide a full-angle transparent transmission material of a terahertz frequency band.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the first electromagnetic resonance unit:
the electromagnetic resonance unit comprises three parts, including a substrate, and an annular metal transmission line frame and a circular metal disc which are arranged on the upper surface of the substrate, wherein the annular metal transmission line frame is arranged on the peripheral edge of the upper surface of the substrate, and the circular metal disc is arranged in the center of the upper surface of the substrate. Meanwhile, the substrate is made of an intrinsic high-resistance silicon wafer, and the annular metal transmission line frame and the circular metal disc are made of copper.
The electromagnetic resonance unit comprises a substrate made of an intrinsic high-resistance silicon wafer, a square metal transmission line frame made of metal copper on the plane of the substrate, and a circular metal disc made of metal copper and arranged at the symmetrical center of the square metal transmission line frame.
The structure of the electromagnetic resonance unit is shown in figure 1. The side length of the resonance unit is smaller than one fourth of the wavelength in the free space, and the resonance unit can be excited by an electric field and a magnetic field to generate electric resonance and magnetic resonance under the incidence of electromagnetic waves, wherein the electric resonance is influenced by the frame of the annular metal transmission line, and the magnetic resonance is influenced by the circular metal disc.
The direction of the electric field of the electromagnetic wave can be in any direction of the plane of the electromagnetic resonance layer, namely the transverse electric wave.
Secondly, a full-angle transparent transmission material of terahertz frequency band:
the full-angle transparent transmission material of the terahertz frequency band is composed of an artificial medium electromagnetic resonance layer, and the electromagnetic resonance layer is formed by a plurality of electromagnetic resonance units in a planar array where the electromagnetic resonance units are located and through space electromagnetic coupling.
The electromagnetic resonance unit comprises a substrate, and an annular metal transmission line frame and a circular metal disc which are arranged on the upper surface of the substrate, wherein the annular metal transmission line frame is arranged on the peripheral edge of the upper surface of the substrate, the circular metal disc is arranged in the center of the upper surface of the substrate, and the annular metal transmission line frame and the circular metal disc are both arranged in central symmetry with the same center of the upper surface of the substrate.
The substrate is square.
The plurality of electromagnetic resonance units are closely arranged and arrayed on the same plane, so that the frames of the annular metal transmission lines on the adjacent electromagnetic resonance units are in contact.
The electromagnetic resonance unit and the electromagnetic resonance layer can be simultaneously excited by an electric field and a magnetic field to generate electric resonance and magnetic resonance under the incidence of electromagnetic waves.
The electromagnetic resonance units are arranged uniformly along the horizontal and vertical directions of the plane where the units are located to form an electromagnetic resonance layer.
The electromagnetic resonance layer has full transmission characteristics under any incident angle under the condition that the terahertz frequency band electromagnetic wave is incident at any angle.
The direction of the electric field of the electromagnetic wave can be in any direction of the plane of the electromagnetic resonance layer, namely the transverse electric wave.
The substrate is made of an intrinsic high-resistance silicon wafer, and the annular metal transmission line frame and the circular metal disc are made of copper.
The invention has the beneficial effects that:
the invention constructs a full-angle transparent transmission material of a terahertz frequency band by utilizing a single-layer planar process, and realizes an equivalent medium with full transmission characteristic under any incident angle under the condition that electromagnetic waves of the terahertz frequency band are incident at any angle
Drawings
FIG. 1 is a schematic view showing the structure of an electromagnetic resonance unit of the present invention, (a) is a view showing the upper surface of a substrate, (b) is a view showing the lower surface of the substrate, and (c) is a side view showing the substrate.
FIG. 2 is a simulation parameter curve of the reflection coefficient of the electromagnetic resonance unit under different incident angles.
FIG. 3 is a simulation parameter curve of the transmission coefficient of the electromagnetic resonance unit of the present invention under different incident angles.
Fig. 4 is a graph comparing simulation results of the electromagnetic resonance unit of the present invention in which 61 structural units are periodically arranged in the horizontal direction of the plane in which the electromagnetic resonance unit is located, the electromagnetic resonance layer is formed under the condition that the vertical direction is set as the period boundary, and the far-field gain of the electromagnetic wave normally incident electromagnetic resonance layer having a frequency of 302GHz with the far-field gain of the electromagnetic wave normally incident air under the same condition.
Detailed Description
The invention will be further explained with reference to the drawings.
The coordinate system constructed by the invention takes the direction of the external normal line on the reverse side of the substrate of the resonance unit as the z direction, the vertical direction of the plane where the electromagnetic resonance unit is positioned as the x direction and the horizontal direction as the y direction.
The structure of the electromagnetic resonance unit of the invention is shown in fig. 1, the resonance unit is a double-layer structure and comprises a top layer annular metal transmission line frame, a circular metal disc structure A and a substrate of a bottom layer dielectric slab B. When the electric field direction of incident waves is along the x direction, the magnetic field is along the y direction, and the propagation direction is along the z-axis direction, because the annular metal transmission line frame forms a resonant ring structure, when the magnetic field is perpendicular to the spiral ring, annular current can be generated, which is a necessary condition for generating magnetic resonance. Magnetic resonance can be changed by adjusting the circular metal disc, and electric resonance can be adjusted by adjusting the frame of the annular metal transmission line.
The specific embodiment of the invention and the working process thereof are as follows:
the electromagnetic resonance unit of the present embodiment has a square structure, and the structural arrangement is as shown in fig. 1, and is composed of a substrate, and a circular metal transmission line frame and a circular metal disk which are arranged on the upper surface of the substrate. The annular metal transmission line frame is arranged at the peripheral edge of the upper surface of the substrate, the circular metal disc is arranged in the center of the upper surface of the substrate, and the annular metal transmission line frame and the circular metal disc are arranged in central symmetry with the same center of the upper surface of the substrate.
The substrate length and width of each cell are 0.224mm, a-b. A top layer annular metal transmission line frame and a circular metal disc structure A with a thickness of tm0.0002 mm. The line width of the top annular metal transmission line frame is 0.012mm, and the diameter of the circular metal disc is 0.120 mm. The bottom layer is a substrate B for supporting, the material is selected to be an intrinsic high-resistance silicon wafer, and the thickness is ts0.140mm, relative dielectric constant 11.9, loss tangent angle 0.00025.
Reflection simulation tests are carried out on the electromagnetic resonance unit of the embodiment under different incidence angles, and simulation parameter curves of reflection coefficients are respectively shown in fig. 2. And calculating parameters S11 and S21 by using an FSS Studio module of CST simulation software, wherein the frequency range is 270-330GHz, the boundary condition is set as a periodic boundary condition, and the excitation mode is selected as TE wave excitation. Curve 1 represents the value of the reflection coefficient (dB) at an incident angle of 80 degrees, curve 2 represents the value of the reflection coefficient (dB) at an incident angle of 64 degrees, curve 3 represents the value of the reflection coefficient (dB) at an incident angle of 48 degrees, curve 4 represents the value of the reflection coefficient (dB) at an incident angle of 32 degrees, curve 5 represents the value of the reflection coefficient (dB) at an incident angle of 16 degrees, and curve 6 represents the value of the reflection coefficient (dB) at an incident angle of 0 degrees.
The electromagnetic resonance unit of the embodiment is subjected to transmission simulation tests under different incidence angles, and simulation parameter curves of transmission coefficients are respectively shown in fig. 3. And calculating parameters S11 and S21 by using an FSS Studio module of CST simulation software, wherein the frequency range is 270-330GHz, the boundary condition is set as a periodic boundary condition, and the excitation mode is selected as TE wave excitation. Curve 1 represents the transmission coefficient (dB) value at an incident angle of 80 degrees, curve 2 represents the transmission coefficient (dB) value at an incident angle of 64 degrees, curve 3 represents the transmission coefficient (dB) value at an incident angle of 48 degrees, curve 4 represents the transmission coefficient (dB) value at an incident angle of 32 degrees, curve 5 represents the transmission coefficient (dB) value at an incident angle of 16 degrees, and curve 6 represents the transmission coefficient (dB) value at an incident angle of 0 degrees.
The results of comparing simulation results of the far field gain of the electromagnetic resonance layer at the normal incidence of electromagnetic waves with a frequency of 302GHz with the far field gain of air at the normal incidence of electromagnetic waves under the same conditions are shown in FIG. 4. Curve 1 represents the far field gain results for air at normal incidence of the electromagnetic wave, and curve 2 represents the far field gain results for the electromagnetic resonance layer at normal incidence of the electromagnetic wave. Comparing the two curves, the directive angle is between (-58 deg., 58 deg.), the curve 1 and the curve 2 are almost completely coincident, and the far field gain values are less than-20 dB at both (-180 deg., 58 deg., and (58 deg., 180 deg.), indicating that the electromagnetic resonance layer can be equivalently air.
The center frequency of the electromagnetic resonance unit is 300GHz, and the center frequency of the electromagnetic resonance layer is 302 GHz. If the electromagnetic resonance unit is to work at other frequencies, the electromagnetic resonance unit can be adjusted in size and the number of layers arranged periodically.
While the above description is directed to a preferred electromagnetic resonance unit designed to operate at a specific frequency of 300GHz in accordance with the present invention, the present invention is not limited thereto, and any person skilled in the art can make modifications and variations equivalent to those of the above disclosed embodiments without departing from the spirit and scope of the present invention.
Claims (5)
1. A full-angle transparent transmission material of a terahertz frequency band is characterized in that: the material mainly comprises an electromagnetic resonance layer, wherein the electromagnetic resonance layer is formed by a plurality of electromagnetic resonance units with the same size in a planar array where the electromagnetic resonance units are located and through spatial electromagnetic coupling;
the electromagnetic resonance unit comprises a substrate, a square metal transmission line frame and a circular metal disc, wherein the square metal transmission line frame and the circular metal disc are arranged on the upper surface of the substrate;
the plurality of electromagnetic resonance units are closely arranged and arrayed on the same plane, so that the square metal transmission line frames on the adjacent electromagnetic resonance units are contacted;
the electromagnetic resonance layer has full transmission characteristics under any incident angle under the condition that the terahertz frequency band electromagnetic wave is incident at any angle.
2. The full-angle transparent transmission material of the terahertz frequency band according to claim 1, characterized in that: the electromagnetic resonance unit and the electromagnetic resonance layer can be simultaneously excited by an electric field and a magnetic field to generate electric resonance and magnetic resonance under the incidence of electromagnetic waves.
3. The full-angle transparent transmission material of the terahertz frequency band according to claim 1, characterized in that: the electromagnetic resonance units are arranged uniformly along the horizontal and vertical directions of the plane where the units are located to form an electromagnetic resonance layer.
4. The full-angle transparent transmission material of the terahertz frequency band according to claim 1, characterized in that: the direction of the electric field of the electromagnetic wave can be in any direction of the plane of the electromagnetic resonance layer, namely the transverse electric wave.
5. The full-angle transparent transmission material of the terahertz frequency band according to claim 1, characterized in that: the substrate is made of an intrinsic high-resistance silicon wafer, and the square metal transmission line frame and the circular metal disc are made of copper.
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| CN109273860B (en) * | 2018-10-18 | 2020-11-13 | 哈尔滨工业大学 | Transmission line type broadband active frequency selective surface |
| CN109888501B (en) * | 2019-02-18 | 2020-10-30 | 黄山学院 | Unit structure of topological insulator electromagnetic induction transparent material insensitive to polarization |
| CN110187338B (en) * | 2019-05-07 | 2021-07-20 | 同济大学 | Broadband transmission matching layer structure |
| CN110380223B (en) * | 2019-07-10 | 2020-10-16 | 浙江大学 | Omnidirectional perfect matching transparent material conforming to uniaxial perfect matching layer model |
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| CN103268985A (en) * | 2013-04-24 | 2013-08-28 | 同济大学 | Electromagnetic wave beam regulating and controlling device |
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| WO2008121159A2 (en) * | 2006-10-19 | 2008-10-09 | Los Alamos National Security Llc | Active terahertz metamaterial devices |
| CN105098349B (en) * | 2015-08-26 | 2018-12-21 | 武汉市灵动时代智能技术有限公司 | A kind of Ku wave band intelligence Meta Materials wide-angle wave transparent frequency selects antenna house |
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| CN103268985A (en) * | 2013-04-24 | 2013-08-28 | 同济大学 | Electromagnetic wave beam regulating and controlling device |
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| Title |
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| Polarization Insensitive and Wide Operating Angle Metamaterial Absorber at X-band;Osman Ayop et al.;《2014 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE)》;20141210;第2-3节及附图1-6 * |
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