CN111755791A - Terahertz wave splitter based on metamaterial and applied to 6G wavelength division multiplexing system - Google Patents
Terahertz wave splitter based on metamaterial and applied to 6G wavelength division multiplexing system Download PDFInfo
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- CN111755791A CN111755791A CN202010640275.7A CN202010640275A CN111755791A CN 111755791 A CN111755791 A CN 111755791A CN 202010640275 A CN202010640275 A CN 202010640275A CN 111755791 A CN111755791 A CN 111755791A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
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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
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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Abstract
The invention discloses a terahertz wave separator based on metamaterial for 6G wavelength division multiplexing system, belonging to the technical field of communication wave separator, the terahertz wave splitter consists of a plurality of same metamaterial unit structures which are periodically arranged along the directions x and y, the metamaterial unit structures are square structures with the side length of P, the metamaterial unit structure comprises a dielectric layer and a metal pattern layer on the surface of the dielectric layer, the metal pattern layer is a straight rectangular cuboid metal wire, when two terahertz waves with specific frequencies are obliquely incident on the surface of the metamaterial wave splitter, the terahertz waves with one frequency are transmitted, the terahertz waves with the other frequency are reflected, the terahertz waves of two frequencies are separated in space by different paths, and the separation of the terahertz waves of two communication windows of 0.225THz and 0.300THz is realized.
Description
Technical Field
The invention belongs to the technical field of communication wave splitters, and particularly relates to a terahertz wave splitter based on a metamaterial.
Background
Terahertz (THz) is an electromagnetic wave in a frequency band between millimeter waves and infrared, the frequency range is 0.1 THz-10 THz, and the corresponding wavelength range is 0.03 mm-3 mm. Terahertz communication is a broadband communication technology with great prospect in future 6G mobile communication systems, and has great attention due to the advantages of wide spectrum resource bandwidth, low transmission delay, large communication capacity and the like. In order to effectively improve the bandwidth utilization rate of terahertz waves, increase the capacity and flexibly network, the research on the wavelength division multiplexing technology in the terahertz communication system is of great necessity and practical significance, and the wave splitter is an important device of the wavelength division multiplexing system.
The metamaterial is a sub-wavelength size periodic structure manufactured by a micro-nano processing technology, the physical properties of the metamaterial depend on a unit structure, particularly metal patterns on the unit structure, and the electromagnetic waves are regulated and controlled by designing the unit structure.
At present, in a terahertz frequency band, researches on multiplexing and demultiplexing devices are few, and mainly focus on researches on terahertz wave splitters based on photonic crystals, wherein the isolation of the terahertz wave splitters needs to be improved and the insertion loss needs to be reduced. The photonic crystal is difficult to process and expensive, and is not beneficial to large-batch production and application, so that a terahertz wave splitter which is convenient to process and has better performance is urgently needed.
When terahertz is incident to the metal surface and resonates, the transmissivity of terahertz waves is reduced rapidly, and reflection occurs on the surface of a medium with low loss and absorption; when the equivalent impedance of the metamaterial is equal to the impedance of the free space, the reflectivity of the terahertz wave is reduced rapidly. By using the two phenomena at two different frequencies, the terahertz waves at the two frequencies can be spatially separated. To make the isolation of the two ports greater, f1Transmitted wave of (a) and (f)2Is as small as possible. When the incident terahertz wave is a TM wave, the larger the potential difference is, the larger the resonance intensity is, and the larger the resonance intensity is, f is1The smaller the transmitted wave, so the simplest "I" shaped metal shape is selected as the unit structure of the metamaterial in the x-axis direction. In order to achieve the condition of impedance matching, the same I-shaped metal shape is adopted on the back surfaceForm f2Can reach a minimum. At this time, terahertz waves of two frequencies can be separated.
Disclosure of Invention
The present invention is directed to solving the above problems of the prior art. A terahertz wave splitter based on a metamaterial and applied to a 6G wavelength division multiplexing system is provided. The technical scheme of the invention is as follows:
a terahertz wave splitter based on metamaterial and applied to a 6G wavelength division multiplexing system is used for wavelength division multiplexing of the 6G wavelength division multiplexing system and is characterized in that the terahertz wave splitter is composed of a plurality of identical metamaterial unit structures, the metamaterial unit structures are periodically arranged along the x direction and the y direction, each metamaterial unit structure is of a square structure, the side length is P, each metamaterial unit structure comprises a dielectric layer (1), a first metal pattern layer (2) on the surface of the dielectric layer (1) and a second metal pattern layer (3) on the back of the dielectric layer, each metal pattern layer (2) is a rectangular metal wire in a shape like the Chinese character 'yi', each second metal pattern layer (3) is a rectangular metal wire in a shape like the Chinese character 'yi', the dielectric layer (1) is used for supporting metal patterns, the terahertz wave absorption loss is small, terahertz waves can be conveniently transmitted through the metamaterial, the first metal pattern layer (2) and the second metal pattern layer (3) are used for interacting with incident terahertz waves, when two terahertz waves with specific frequencies near the communication window are obliquely incident to the surface of the metamaterial wave splitter, the terahertz waves with one frequency are transmitted, the terahertz waves with the other frequency are reflected, the terahertz waves with the two frequencies are separated in different paths in space, and the terahertz waves of the two communication windows of 0.225THz and 0.300THz are separated.
Furthermore, the dielectric layer is made of quartz crystal or polyimide or silicon and has a thickness of 25-100 μm, and the metal materials on the upper and lower surfaces of the dielectric layer are gold, silver or copper and have a thickness of 0.2-0.5 μm.
Furthermore, the side length P of the dielectric layer of the metamaterial unit structure is 300 mu m.
Further, the dielectric layer is made of quartz, and the thickness of the dielectric layer is 50.0 μm;
the metal layer is made of metal gold and has the thickness of 0.2 mu m;
the length l of the metal wire on the upper surface of the dielectric layer is 460 μm, and the width w is 16 μm;
the length l of the metal wire on the lower surface of the dielectric layer is 460 μm, and the width w is 16 μm.
Further, when f1And f2When terahertz waves with two frequencies are simultaneously incident on the surface of the metamaterial in the xoz plane, f1Reflecting, receiving the reflected wave f1 Port 1; f. of2Transmitting and receiving the transmitted wave f2Is port 2.
Further, at f1In the range of (0.222-0.228 THz), the isolation of the wave separator is greater than 22dB, the maximum isolation at the position of 0.225THz is 37dB, and the insertion loss is 0.19 dB; at f2In the range of (0.291-0.312 THz), the isolation of the wave separator is larger than 22dB, the maximum isolation at the position of 0.300THz is 49dB, and the insertion loss is 0.04 dB.
The invention has the following advantages and beneficial effects:
the invention has the innovation points that a metamaterial structure is adopted as the physical structure of the wave separator, compared with the photonic crystal, the metamaterial is easier to process and more suitable for large-scale popularization and application, and the isolation degree and the insertion loss performance at a working frequency point are better; the metamaterial is flexible and convenient to design, and the working frequency of the wave separator can be designed to a required frequency point by designing a metamaterial unit structure according to the actual application requirement. When the metamaterial structure takes the parameters, the terahertz waves of 0.225THz and 0.300THz can be separated, and the separation effect is good, the isolation degree is large, and the loss is small.
Drawings
Fig. 1(a) is a front view of the structure size of a terahertz wave splitter unit based on a metamaterial according to a preferred embodiment of the invention, and fig. 1(b) is a back view of the structure of the terahertz wave splitter unit.
Fig. 2 is a three-dimensional diagram of a metamaterial wave splitter unit structure.
Fig. 3 is a diagram of a metamaterial splitter array.
FIG. 4 is a wave splitting schematic diagram of a terahertz wave splitter based on a metamaterial;
FIG. 5 is an S parameter graph of a metamaterial terahertz wave splitter;
FIG. 6 is a group delay plot for port 1;
fig. 7 is a port2 group delay plot.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail and clearly with reference to the accompanying drawings. The described embodiments are only some of the embodiments of the present invention.
The technical scheme for solving the technical problems is as follows:
the front side of the terahertz wave splitter unit structure of the invention is shown in fig. 1(a), and the metal pattern is a linear metal wire. The back of the terahertz wave splitter unit structure is shown in fig. 1(b), and is a linear metal wire. When two terahertz waves with specific frequencies are obliquely incident on the surface of the metamaterial wave splitter, the terahertz waves with one frequency are transmitted, and the terahertz waves with the other frequency are reflected, so that the terahertz waves with the two frequencies are spatially separated by different paths. The terahertz wave separation of two communication windows of 0.225THz and 0.300THz is realized.
The dielectric layer is made of quartz and has a thickness of 50.0 μm.
The metal layer is made of metal gold and has a thickness of 0.2 μm.
The side length P of the dielectric layer of the metamaterial unit structure is 600 mu m.
The length l of the metal wire on the upper surface of the dielectric layer is 460 μm, and the width w is 16 μm.
The length l of the metal wire on the lower surface of the dielectric layer is 460 μm, and the width w is 16 μm.
Fig. 2 is a three-dimensional diagram of a unit structure of a terahertz wave splitter based on a metamaterial.
Fig. 3 is a diagram of a metamaterial splitter array in which the cell structures extend in the x, y directions.
FIG. 4 is a schematic diagram of a terahertz wave splitter based on a metamaterial, when f1And f2When terahertz waves with two frequencies are simultaneously incident on the surface of the metamaterial in the xoz plane, f1The reflection of the light is carried out,receiving the reflected wave f1Port of (2) port 1; f. of2Transmitting and receiving the transmitted wave f2Port of (2) is port 2.
Fig. 5 is an S-parameter graph of a metamaterial terahertz wave splitter according to example 1. At f1Within the range of (0.222-0.228 THz), the isolation of the wave separator is larger than 22dB, the maximum isolation at the position of 0.225THz is 37dB, and the insertion loss is 0.19 dB. At f2In the range of (0.291-0.312 THz), the isolation of the wave separator is larger than 22dB, the maximum isolation at the position of 0.300THz is 49dB, and the insertion loss is 0.04 dB. The wave separator has good isolation effect in the two frequency range ranges, has small insertion loss and is beneficial to effective transmission of communication signals.
FIG. 6 shows the simulation results of the group delay of Port 1. At Port1, the group delay averages 6.74ps and the group delay maximum difference is 0.44 ps.
FIG. 7 shows the simulation results of Port2 group delay. At Port2, the group delay decreases slowly as the frequency increases, with an average of 3.61ps and a maximum value of 1.84ps for the group delay difference.
And as can be seen from the group delay data of the two ports, at f1And f2Within the working frequency range of the terahertz wave splitter, the group delay difference value of the terahertz wave splitter is small and stable.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. One typical implementation device is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (6)
1. A terahertz wave splitter based on a metamaterial and applied to a 6G wavelength division multiplexing system is used for wavelength division multiplexing of the 6G wavelength division multiplexing system and is characterized in that the terahertz wave splitter is composed of a plurality of identical metamaterial unit structures, the metamaterial unit structures are periodically arranged along the x direction and the y direction, each metamaterial unit structure is of a square structure, the side length is P, each metamaterial unit structure comprises a dielectric layer (1), a first metal pattern layer (2) on the surface of the dielectric layer (1) and a second metal pattern layer (3) on the back of the dielectric layer, each metal pattern layer (2) is a rectangular metal wire in a shape like the Chinese character 'yi', each second metal pattern layer (3) is a rectangular metal wire in a shape like the Chinese character 'yi', the dielectric layer (1) is used for supporting metal patterns, the terahertz wave absorption loss is small, the terahertz wave can be conveniently transmitted through the metamaterial, the first metal pattern layer (2) and the second metal pattern layer (3) are used for interacting with incident terahertz waves, when two terahertz waves with specific frequencies near the communication window are obliquely incident to the surface of the metamaterial wave splitter, the terahertz waves with one frequency are transmitted, the terahertz waves with the other frequency are reflected, the terahertz waves with the two frequencies are separated in different paths in space, and the terahertz waves of the two communication windows of 0.225THz and 0.300THz are separated.
2. The terahertz wave splitter applied to a 6G wavelength division multiplexing system and based on a metamaterial according to claim 1, wherein the dielectric layer is made of quartz crystal, polyimide or silicon, the thickness of the dielectric layer is 25-100 μm, the metal materials on the upper surface and the lower surface of the dielectric layer are gold, silver or copper, and the thickness of the dielectric layer is 0.2-0.5 μm.
3. The terahertz wave splitter based on the metamaterial, applied to the 6G wavelength division multiplexing system, as claimed in claim 1, wherein the length P of the side of the dielectric layer of the metamaterial unit structure is 600 μm.
4. The terahertz wave splitter based on the metamaterial as claimed in claim 2, wherein the dielectric layer is made of quartz with a thickness of 50.0 μm;
the metal layer is made of metal gold and has the thickness of 0.2 mu m;
the length l of the metal wire on the upper surface of the dielectric layer is 460 μm, and the width w is 16 μm;
the length l of the metal wire on the lower surface of the dielectric layer is 460 μm, and the width w is 16 μm.
5. The method according to any one of claims 1 to 4, applied to 6G wavelength division multiplexingThe terahertz wave splitter based on the metamaterial is characterized in that when f is1And f2When terahertz waves with two frequencies are simultaneously incident on the surface of the metamaterial in the xoz plane, f1Reflecting, receiving the reflected wave f1Port 1; f. of2Transmitting and receiving the transmitted wave f2Port of (2) is port 2.
6. The terahertz wave splitter based on metamaterial as claimed in claim 5, wherein the terahertz wave splitter is applied to the 6G wavelength division multiplexing system at f1In the range of (0.222-0.228 THz), the isolation of the wave separator is greater than 22dB, the maximum isolation at the position of 0.225THz is 37dB, and the insertion loss is 0.19 dB; at f2In the range of (0.291-0.312 THz), the isolation of the wave separator is larger than 22dB, the maximum isolation at the position of 0.300THz is 49dB, and the insertion loss is 0.04 dB.
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Cited By (1)
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| CN113113775A (en) * | 2021-03-25 | 2021-07-13 | 重庆邮电大学 | Terahertz wave splitter applied to 6G system and based on double-line metamaterial structure |
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