WO2024128785A1 - Cellule unitaire d'absorbeur de métamatériaux souple et mince pour 28 ghz et 77 ghz ayant une largeur de bande de fonctionnement et absorbeur de métamatériaux la comprenant - Google Patents

Cellule unitaire d'absorbeur de métamatériaux souple et mince pour 28 ghz et 77 ghz ayant une largeur de bande de fonctionnement et absorbeur de métamatériaux la comprenant Download PDF

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Publication number
WO2024128785A1
WO2024128785A1 PCT/KR2023/020500 KR2023020500W WO2024128785A1 WO 2024128785 A1 WO2024128785 A1 WO 2024128785A1 KR 2023020500 W KR2023020500 W KR 2023020500W WO 2024128785 A1 WO2024128785 A1 WO 2024128785A1
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unit cell
metamaterial absorber
metal layer
ghz
layer
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English (en)
Korean (ko)
Inventor
이영백
정해옥
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Alpha Adt Co Ltd
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Alpha Adt Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • H01Q17/002—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using short elongated elements as dissipative material, e.g. metallic threads or flake-like particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape

Definitions

  • the present invention relates to a metamaterial absorber, and more specifically, to a metamaterial absorber unit cell having flexible and thin characteristics and an operating bandwidth of 28 GHz and 77 GHz, and a metamaterial absorber including the same.
  • electromagnetic wave absorbers are devices that greatly reduce reflected or transmitted electromagnetic waves by absorbing electromagnetic waves incident on the surface and consuming them as heat, and are used for purposes such as blocking electromagnetic waves.
  • electromagnetic wave absorbers are based on mixed materials such as ferrite materials, but these electromagnetic wave absorbers have the disadvantage of being bulky, heavy, and expensive. Therefore, an electromagnetic wave absorber using metamaterials has recently been proposed.
  • Metamaterials are artificially designed materials that contain both electrical and magnetic elements to have properties not found in nature, and have the property of easily absorbing electromagnetic waves.
  • the metamaterial absorber is implemented by using a metamaterial with a high electromagnetic wave absorption rate.
  • the operating frequency of the metamaterial absorber is limited to a specific frequency, so there is no operating bandwidth or the operating bandwidth is very narrow. Therefore, the electromagnetic wave absorption rate of the metamaterial absorber has a limit in that it remains high only at certain frequencies in the form of a single peak.
  • metamaterial absorbers have limitations such as being inflexible, having a large thickness, and manufacturing costs being relatively high.
  • One object of the present invention is to provide a unit cell of a metamaterial absorber for 28 GHz and 77 GHz that maintains a constant electromagnetic wave absorption rate even when the angle of incidence of the incident electromagnetic wave changes.
  • Another object of the present invention is to provide a unit cell of a metamaterial absorber for 28 GHz and 77 GHz that has an operating bandwidth with a constant operating frequency and an electromagnetic wave absorption rate that is maintained constant within the operating bandwidth range.
  • Another object of the present invention is to provide a unit cell of a metamaterial absorber for 28 GHz and 77 GHz that is flexible, thin, and has a relatively low manufacturing cost.
  • the unit cell of the metamaterial absorber is composed of a square ring portion and first to fourth protrusions that are each perpendicular to the four sides of the square ring portion and extend inward from the center point of the four sides of the square ring portion. It includes a first metal layer including a conductor pattern, a resistor layer disposed on the lower surface of the first metal layer, and a second metal layer disposed on the lower surface of the resistive layer, where the resistor layer has a thickness of 0.05 mm to 0.15 mm and a sheet resistance of It is 530 ⁇ sq -1 to 550 ⁇ sq -1 , and the operating bandwidth of the operating frequency can be increased.
  • the operating bandwidth of the operating frequency may be 27 GHz to 29 GHz.
  • the unit cell of the metamaterial absorber includes a first intermediate layer disposed between the first metal layer and the resistor layer and including a polyimide material, and a second intermediate layer disposed between the resistor layer and the second metal layer and including a polyimide material. It may further include.
  • the first metal layer has a square ring width of 0.05 mm to 0.15 mm
  • each of the first to fourth protrusions has a width of 0.1 mm to 0.3 mm
  • each of the first to fourth protrusions has a length of 0.1 mm to 0.1 mm. It may be 0.3 mm.
  • the first metal layer and the second metal layer may have a thickness of 30 ⁇ m to 40 ⁇ m.
  • the resistive layer may have a horizontal and vertical length of 3.5 mm to 4.5 mm.
  • the first metal layer, the first intermediate layer, the second intermediate layer, and the second metal layer may have horizontal and vertical lengths of 3.5 mm to 5.5 mm.
  • the first intermediate layer may have a thickness of 0.3 mm to 0.5 mm
  • the second intermediate layer may have a thickness of 0.4 mm to 0.6 mm.
  • the unit cell of the metamaterial absorber according to another embodiment of the present invention is perpendicular to the square ring portion and the four sides of the square ring portion, and is spaced apart from the center point of the four sides of the square ring portion by a gap of a preset size and moves in the inner direction. It includes a first metal layer including a conductor pattern consisting of first to fourth protrusions extending to The thickness is 0.05 mm to 0.15 mm, the sheet resistance is 530 ⁇ sq -1 to 550 ⁇ sq -1 , and the operating bandwidth of the operating frequency can be increased.
  • the operating bandwidth of the operating frequency may be 76 GHz to 78 GHz.
  • the unit cell of the metamaterial absorber includes a first intermediate layer disposed between the first metal layer and the resistor layer and including a polyimide material, and a second intermediate layer disposed between the resistor layer and the second metal layer and including a polyimide material. It may further include.
  • the square ring portion of the first metal layer may have a width of 0.02 mm to 0.03 mm, and the first to fourth protrusions may have a width of 0.04 mm to 0.06 mm.
  • the length of the first to fourth protrusions of the first metal layer may be 0.35 mm to 0.55 mm, and the gap may be 0.05 mm to 0.15 mm.
  • the first metal layer, the first intermediate layer, the resistor layer, the second intermediate layer, and the second metal layer may have horizontal and vertical lengths of 1.3 mm to 1.5 mm.
  • the first intermediate layer may have a thickness of 0.05 mm to 0.15 mm
  • the second intermediate layer may have a thickness of 0.05 mm to 0.15 mm.
  • the unit cell of the metamaterial absorber and the metamaterial absorber according to an embodiment of the present invention can maintain the electromagnetic wave absorption rate constant even when the incident angle of the incident electromagnetic wave changes.
  • the unit cell of the metamaterial absorber and the metamaterial absorber according to an embodiment of the present invention have an operating bandwidth with a constant operating frequency, and can maintain the electromagnetic wave absorption rate constant within the operating bandwidth range.
  • the unit cell of the metamaterial absorber and the metamaterial absorber according to an embodiment of the present invention may be flexible, thin, and have a relatively low manufacturing cost.
  • the unit cell of the metamaterial absorber and the metamaterial absorber can maximize electromagnetic wave absorption efficiency.
  • the unit cell of the metamaterial absorber and the metamaterial absorber are used in the 27 GHz to 29 GHz (center frequency 28 GHz) band, they exhibit an absorption rate of more than 99% for vertically incident electromagnetic waves and for 45° incident electromagnetic waves. It can exhibit an absorption rate of over 97% and can be used for ultra-high frequency electronic components for 5G mobile communications or for absorbing and blocking internal and external electromagnetic waves.
  • the unit cell of the metamaterial absorber and the metamaterial absorber according to the present invention when used in the 76 GHz to 78 GHz (center frequency 77 GHz) band, they exhibit an absorption rate of more than 99% for vertically incident electromagnetic waves and 45° incident electromagnetic waves. It can show an absorption rate of more than 97%, and can be used to prevent electronic device performance degradation and malfunction due to electromagnetic interference in internal and external electrical equipment caused by ultra-high frequencies transmitted from the collision avoidance radar of self-driving cars.
  • 1A to 2B are diagrams for explaining a unit cell of a metamaterial absorber according to an embodiment.
  • FIGS. 3A to 3F are diagrams for explaining in more detail the unit cell of the metamaterial absorber according to one embodiment.
  • FIGS. 4A to 4D are diagrams for explaining the results of simulating the unit cell of a metamaterial absorber in TE mode according to an embodiment.
  • FIGS. 5A to 5D are diagrams for explaining the results of simulating the unit cell of a metamaterial absorber in TM mode according to an embodiment.
  • Figure 6 is a diagram for explaining the operation of absorbing electromagnetic waves in a metamaterial absorber according to an embodiment.
  • Singular expressions may include plural expressions, unless the context clearly dictates otherwise.
  • a component e.g. a first
  • another component e.g. a second
  • the component is connected to the other component. It may be connected directly to a component or may be connected through another component (e.g., a third component).
  • the expression “a device configured to” may mean that the device is “capable of” working with other devices or components.
  • processor configured (or set) to perform A, B, and C refers to a processor dedicated to performing the operations (e.g., an embedded processor), or by executing one or more software programs stored on a memory device.
  • processor may refer to a general-purpose processor (e.g., CPU or application processor) that can perform the corresponding operations.
  • Terms such as '..unit' and '..unit' used hereinafter refer to a unit that processes at least one function or operation, and may be implemented as hardware, software, or a combination of hardware and software.
  • 1A to 2B are diagrams for explaining a unit cell of a metamaterial absorber according to an embodiment.
  • FIGS. 1A and 1B illustrate a unit cell of a metamaterial absorber according to the first embodiment
  • FIGS. 2A and 2B illustrate a unit cell of a metamaterial absorber according to the second embodiment.
  • the unit cell 100 of the metamaterial absorber according to the first embodiment includes a first metal layer 110, a first intermediate layer 120, a resistive layer 130, and a second intermediate layer 140. ) and a second metal layer 150.
  • the unit cell 100 of the metamaterial absorber according to the first embodiment is designed to be optimized in size, shape, and shape of the conductor pattern, and has performance (electromagnetic wave) in the operating bandwidth of the operating frequency of 27 GHz to 29 GHz (center frequency 28 GHz) absorption rate, etc.) can be maximized.
  • the unit cell 100 has the shape of the conductor pattern, the width of the conductor pattern (square ring + protrusion), the length of one side of the unit cell 100, and the first intermediate layer 120 and the second intermediate layer 140.
  • the thickness, thickness and sheet resistance of the resistive layer 130 can be optimized.
  • the first metal layer 110 may include a conductor pattern consisting of a square ring portion and first to fourth protrusions that are each perpendicular to the four sides of the square ring portion and extend inward from the center point of the four sides of the square ring portion. there is.
  • the first intermediate layer 120 is disposed on the lower surface of the first metal layer 110 and may include a polyimide material.
  • the resistive layer 130 may be disposed on the lower surface of the first intermediate layer 120, where the resistive layer 130 is designed to have a thickness of 0.05 mm to 0.15 mm and a sheet resistance of 530 ⁇ sq -1 to 550 ⁇ sq. Designed as -1 , the operating bandwidth of the operating frequency can be increased.
  • the second intermediate layer 140 is disposed on the lower surface of the resistive layer 130 and may include a polyimide material.
  • the second metal layer 150 may be disposed on the lower surface of the second intermediate layer 140.
  • the first metal layer 110 is designed to have a width of 0.05 mm to 0.15 mm in the square ring portion, and the width of each of the first to fourth protrusions is designed to be 0.1 mm to 0.3 mm, and the first to fourth protrusions are designed to have a width of 0.1 mm to 0.3 mm.
  • Each length can be designed to be 0.1 mm to 0.3 mm.
  • first metal layer 110 and the second metal layer 150 may be designed to have a thickness of 30 ⁇ m to 40 ⁇ m.
  • the resistor layer 130 is designed to have a horizontal and vertical length of 3.5 mm to 4.5 mm, and includes a first metal layer 110, a first intermediate layer 120, a second intermediate layer 140, and a second metal layer ( 150) can be designed to have a horizontal and vertical length of 3.5 mm to 5.5 mm.
  • first intermediate layer 120 may be designed to have a thickness of 0.3 mm to 0.5 mm
  • second intermediate layer 140 may be designed to have a thickness of 0.4 mm to 0.6 mm.
  • the metamaterial absorber according to the first embodiment may be formed by arranging a plurality of unit cells 100 in a two-dimensional array structure, and this high-performance metamaterial absorber produced at low cost can be used as ultra-high frequency electronic components for 5G mobile communication or It can be used to absorb and block internal and external electromagnetic waves.
  • the unit cell 200 of the metamaterial absorber according to the second embodiment includes a first metal layer 210, a first intermediate layer 220, a resistive layer 230, and a second intermediate layer 240. ) and a second metal layer 250.
  • the unit cell 200 of the metamaterial absorber according to the second embodiment is designed to be optimized in size, shape, and conductor pattern shape, and has performance (electromagnetic wave) in the operating bandwidth of the operating frequency of 76 GHz to 78 GHz (center frequency 77 GHz). absorption rate, etc.) can be maximized.
  • the unit cell 200 has the shape of the conductor pattern, the width of the conductor pattern (square ring + protrusion), the size of the gap between the square ring and the protrusion, the length of one side of the unit cell 200,
  • the thickness of the first intermediate layer 220 and the second intermediate layer 240, and the thickness and sheet resistance of the resistive layer 230 can be optimized.
  • the first metal layer 210 has a square ring portion and first to fourth protrusions that are perpendicular to each of the four sides of the square ring portion and extend inwardly by a gap of a preset size from the center point of the four sides of the square ring portion. It may include a constructed conductor pattern.
  • the first intermediate layer 220 is disposed on the lower surface of the first metal layer 210 and may include a polyimide material.
  • the resistive layer 230 may be disposed on the lower surface of the first intermediate layer 220, where the resistive layer 230 is designed to have a thickness of 0.05 mm to 0.15 mm and a sheet resistance of 530 ⁇ sq -1 to 550 ⁇ sq. Designed as -1 , the operating bandwidth of the operating frequency can be increased.
  • the second intermediate layer 240 is disposed on the lower surface of the resistive layer 230 and may include a polyimide material.
  • the second metal layer 250 may be disposed on the lower surface of the second intermediate layer 240.
  • the first metal layer 210 may be designed so that the width of the square ring portion is 0.02 mm to 0.03 mm, and the width of the first to fourth protrusions may be designed to be 0.04 mm to 0.06 mm.
  • the first metal layer 210 is designed so that the first to fourth protrusions have a length of 0.35 mm to 0.55 mm, and the gap formed between the first to fourth protrusions and each side of the square ring has a size of 0.05 mm to 0.15 mm. It can be designed in mm.
  • the first metal layer 210 and the second metal layer 150 may be designed to have a thickness of 30 ⁇ m to 40 ⁇ m.
  • first metal layer 210, the first intermediate layer 220, the resistor layer 230, the second intermediate layer 240, and the second metal layer 250 are designed to have horizontal and vertical lengths of 1.3 mm to 1.5 mm. You can.
  • first intermediate layer 220 may be designed to have a thickness of 0.05 mm to 0.15 mm
  • second intermediate layer 240 may be designed to have a thickness of 0.05 mm to 0.15 mm.
  • the metamaterial absorber according to the second embodiment can be formed by arranging a plurality of unit cells 200 in a two-dimensional array structure, and this high-performance metamaterial absorber produced at low cost is used to prevent collisions in autonomous vehicles. It can be used to prevent performance degradation and malfunction of electronic devices due to electromagnetic interference in internal and external electrical equipment caused by ultra-high frequencies transmitted from radar.
  • FIGS. 3A to 3F are diagrams for explaining in more detail the unit cell of the metamaterial absorber according to one embodiment.
  • Figure 3a illustrates the first metal layer of the unit cell of the metamaterial absorber according to the first embodiment
  • Figure 3b illustrates the first metal layer of the unit cell of the metamaterial absorber according to the second embodiment
  • Figure 3c shows the first metal layer of the unit cell of the metamaterial absorber according to the first embodiment.
  • the first intermediate layer of the unit cell of the metamaterial absorber according to the first and second embodiments is illustrated.
  • Figure 3D illustrates the resistor layer of the unit cell of the metamaterial absorber according to the first and second embodiments
  • Figure 3E illustrates the second intermediate layer of the unit cell of the metamaterial absorber according to the first and second embodiments
  • 3F illustrates the second metal layer of the unit cell of the metamaterial absorber according to the first and second embodiments.
  • the unit cell of the metamaterial absorber according to the first and second embodiments can maximize performance (electromagnetic wave absorption rate, etc.) by optimizing the size, shape, and shape of the conductor pattern.
  • the unit cell is shown in FIGS. 3A to 3F. The cell optimization design results will be explained in more detail.
  • the first metal layer 310a is a square ring portion and first to first to fourth layers that are perpendicular to the four sides of the square ring portion and extend inward from the center point of the four sides of the square ring portion. It may include a conductor pattern consisting of a fourth protrusion.
  • the first metal layer 310a is designed to have a width (WSa) of the square ring portion of 0.05 mm to 0.15 mm, a width (WPa) of each of the first to fourth protrusions is designed to be 0.1 mm to 0.3 mm, and the first The length (LPa) of each of the to fourth protrusions may be designed to be 0.1 mm to 0.3 mm.
  • the thickness of the first metal layer 310a may be designed to be 30 ⁇ m to 40 ⁇ m, and the horizontal and vertical lengths (Pa) of the square ring portion may be designed to be 3.5 mm to 5.5 mm.
  • the unit cell can minimize reflection in the target frequency band (i.e., 27 GHz to 29 GHz) by optimally designing the conductor pattern of the first metal layer 310a.
  • the impedance of the atmosphere is 1, the impedance of the entire conductor pattern can be designed to be 1 at the corresponding frequency, and the thickness of the first metal layer 310a, for example, a copper layer, is the normal thickness of a copper layer in electronic materials. It can be designed to be 0.035 mm.
  • the conductor pattern i.e., metapattern
  • the absorption rate of microwaves incident on the unit cell can be controlled so as to hardly decrease depending on the angle of incidence.
  • the first metal layer 310b according to the second embodiment is perpendicular to the square ring portion and the four sides of the square ring portion, and has a gap (g) of a preset size from the center point of the four sides of the square ring portion. It may include a conductor pattern consisting of first to fourth protrusions that are spaced apart from each other and extend in the inward direction.
  • the first metal layer 310b may be designed to have a width (WSb) of the square ring portion of 0.02 mm to 0.03 mm, and a width (WPb) of each of the first to fourth protrusions may be designed to be 0.04 mm to 0.06 mm.
  • the first metal layer 310b is designed so that the length (LPb) of the first to fourth protrusions is 0.35 mm to 0.55 mm, and the gap (g) formed between the first to fourth protrusions and each side of the square ring portion is The size can be designed to be 0.05 mm to 0.15 mm.
  • the thickness of the first metal layer 310a may be designed to be 30 ⁇ m to 40 ⁇ m, and the horizontal and vertical lengths (Pb) of the square ring portion may be designed to be 1.3 mm to 1.5 mm.
  • the unit cell can minimize reflection in the target frequency band (ie, 76 GHz to 78 GHz) by optimally designing the conductor pattern of the first metal layer 310b.
  • the impedance of the atmosphere is 1, the impedance of the entire conductor pattern can be designed to be 1 at the corresponding frequency, and the thickness of the first metal layer 310b, for example, the copper layer, is the normal thickness of the copper layer in electronic materials. It can be designed to be 0.035 mm.
  • the conductor pattern i.e., metapattern
  • the absorption rate of microwaves incident on the unit cell can be controlled so as to hardly decrease depending on the angle of incidence.
  • the first intermediate layer 320 and the second intermediate layer 340 may include a polyimide material with a dielectric constant of 3.5 and a dielectric loss tangent of 0.0027.
  • the first intermediate layer 320 is designed to have a thickness (TP1) of 0.3 mm to 0.5 mm
  • the second intermediate layer 340 is designed to have a thickness (TP2) of 0.4 mm. It can be designed from mm to 0.6 mm.
  • the first intermediate layer 320 is designed to have a thickness (TP1) of 0.05 mm to 0.15 mm
  • the second intermediate layer 340 is designed to have a thickness (TP2) of 0.05 mm. It can be designed from mm to 0.15 mm.
  • the horizontal and vertical lengths (Pa) of the first intermediate layer 320 and the second intermediate layer 340 may be designed to be 3.5 mm to 5.5 mm
  • the horizontal and vertical lengths (Pa) of the first intermediate layer 320 and the second intermediate layer 340 may be designed to be 1.3 mm to 1.5 mm.
  • the unit cell according to the first and second embodiments utilizes a flexible and inexpensive polyimide material for the first intermediate layer 320 and the second intermediate layer 340 to electromagnetic wave incident on the metamaterial absorber. By confining, storing, and attenuating it, it can be controlled to achieve an absorption rate of over 99% for normally incident microwaves.
  • the resistive layer 330 may be designed to have a thickness (TR) of 0.05 mm to 0.15 mm and a sheet resistance of 530 ⁇ sq -1 to 550 ⁇ sq -1 .
  • the horizontal and vertical lengths (Pa) of the resistive layer 330 may be designed to be 3.5 mm to 5.5 mm, and the unit cell may be designed to be 3.5 mm to 5.5 mm. In the case of a unit cell, the horizontal and vertical lengths (Pa) of the resistive layer 330 may be designed to be 1.3 mm to 1.5 mm.
  • the resistive layer 330 having a sheet resistance of 530 ⁇ sq -1 to 550 ⁇ sq -1 (preferably, 540 ⁇ sq -1 ) formed between the first intermediate layer 320 and the second intermediate layer 340. ) serves to increase the bandwidth while minimizing the effect on the flexibility of the absorber.
  • the thickness (TR) can be optimally designed.
  • the thickness of the resistive layer 330 can be designed to be 0.1 mm.
  • the second metal layer 350 may be designed to have a thickness (TC) of 30 ⁇ m to 40 ⁇ m.
  • the horizontal and vertical lengths (Pa) of the second metal layer 350 may be designed to be 3.5 mm to 5.5 mm, and the unit cell is the unit cell according to the second embodiment.
  • the horizontal and vertical lengths (Pa) of the second metal layer 350 may be designed to be 1.3 mm to 1.5 mm.
  • the second metal layer 350 may serve to block all microwaves entering the metamaterial absorber from escaping, and for this purpose, it may be formed of a thin copper layer with a thickness of 35 ⁇ m.
  • the unit cell according to the first embodiment has a size of 4.4
  • the width can be appropriately maintained at 28 ⁇ 1 GHz even at normal incidence or at a 45° angle of incidence.
  • the unit cell according to the second embodiment has a size of 1.4
  • the width can be appropriately maintained at 77 ⁇ 1 GHz even at normal incidence or at a 45° angle of incidence.
  • FIGS. 4A to 4D are diagrams for explaining the results of simulating a metamaterial absorber in TE mode according to an embodiment.
  • reference numeral 410 illustrates the absorption spectrum of the metamaterial absorber according to the first embodiment according to the normally incident TE (transverse electric) mode electromagnetic wave
  • reference numeral 420 illustrates the absorption spectrum of the metamaterial absorber according to the first embodiment according to the normally incident TE (transverse electric) mode electromagnetic wave.
  • the absorption spectrum of the metamaterial absorber according to the second embodiment is illustrated.
  • reference numeral 430 illustrates the absorption spectrum of the metamaterial absorber according to the first embodiment according to the change in the angle of incidence of the TE mode electromagnetic wave (0° (i.e., normal angle of incidence), 15°, 30°, 45°)
  • Reference numeral 440 illustrates the absorption spectrum of the metamaterial absorber according to the second embodiment according to the change in the angle of incidence of the TE mode electromagnetic wave (0° (i.e., normal angle of incidence), 15°, 30°, 45°).
  • the x-axis refers to frequency (unit: GHz) and the y-axis refers to the absorption rate of electromagnetic waves.
  • reference numeral 430 represents the result of enlarging the area corresponding to the frequency band of 20 GHz to 40 GHz in (a) of reference numeral 430
  • reference numeral 440 represents (b) of reference numeral 440.
  • a) the result of enlarging the area corresponding to the frequency band of 76 GHz to 78 GHz is shown.
  • the metamaterial absorber according to the first embodiment in which the size and shape of the unit cell and the shape of the conductor pattern are optimally designed is 27 GHz to 29 GHz (center frequency 28 GHz) for normally incident TE mode electromagnetic waves. It was found to have an absorption rate of at least 99.42% in the band.
  • the metamaterial absorber according to the first embodiment is shown to exhibit an absorption rate of at least 97.03% even when the angle of incidence changes, as shown in reference numeral 430 and Table 1 below, and can absorb up to 27 GHz without a significant effect on changes in the angle of incidence. It was found to exhibit very good performance in the 29 GHz (center frequency 28 GHz) band.
  • the metamaterial absorber according to the second embodiment in which the size and shape of the unit cell and the shape of the conductor pattern are optimally designed is 76 GHz to 78 GHz (center frequency 77 GHz) for normally incident TE mode electromagnetic waves. It was found to exhibit an absorption rate of at least 99.47% in the band. In addition, the metamaterial absorber according to the second embodiment shows an absorption rate of at least 97.03% even when the angle of incidence changes, as shown in reference numeral 430 and Table 2 below. It was found that very good performance was shown in the 76 GHz to 78 GHz (center frequency 77 GHz) band without any significant effect on changes in the angle of incidence.
  • FIGS. 5A to 5D are diagrams for explaining the results of simulating a metamaterial absorber in TM mode according to an embodiment.
  • reference numeral 510 illustrates the absorption spectrum of the metamaterial absorber according to the first embodiment according to the normally incident TM (transverse magnetic) mode electromagnetic wave
  • reference numeral 520 indicates the absorption spectrum of the metamaterial absorber according to the first embodiment according to the normally incident TM (transverse magnetic) mode electromagnetic wave.
  • the absorption spectrum of the metamaterial absorber according to the second embodiment is illustrated.
  • reference numeral 530 illustrates the absorption spectrum of the metamaterial absorber according to the first embodiment according to the change in the angle of incidence of TM mode electromagnetic waves (0° (vertical incidence angle), 15°, 30°, 45°), and the reference numeral 530 illustrates the absorption spectrum of the metamaterial absorber according to the first embodiment.
  • 540 illustrates the absorption spectrum of the metamaterial absorber according to the second embodiment according to the change in the angle of incidence of TM mode electromagnetic waves (0° (vertical angle of incidence), 15°, 30°, 45°).
  • the x-axis refers to frequency (unit: GHz) and the y-axis refers to the absorption rate of electromagnetic waves.
  • (b) of reference numeral 430 represents the result of enlarging the area corresponding to the frequency band of 20 GHz to 40 GHz in (a) of 530, and (b) of 540 represents (b) of (540).
  • (b) of reference numeral 430 represents the result of enlarging the area corresponding to the frequency band of 20 GHz to 40 GHz in (a) of 530
  • (b) of 540 represents (b) of (540).
  • the result of enlarging the area corresponding to the frequency band of 76 GHz to 78 GHz is shown.
  • the metamaterial absorber according to the first embodiment in which the size and shape of the unit cell and the shape of the conductor pattern are optimally designed is 27 GHz to 29 GHz (center frequency 28 GHz) for normally incident TM mode electromagnetic waves. It was found to have an absorption rate of at least 99.42% in the band, the same as the TE mode, and through this, it can be confirmed that a metamaterial absorber was designed that shows properties independent of the polarization of the incident electromagnetic wave.
  • the metamaterial absorber according to the first embodiment is shown to exhibit an absorption rate of at least 99.33% even when the angle of incidence changes, as shown in reference numeral 530 and Table 3 below, and can be used from 27 GHz to 29 GHz without a significant effect on the angle of incidence. It was found to show very good performance in the GHz (center frequency 28 GHz) band.
  • the metamaterial absorber according to the second embodiment in which the size and shape of the unit cell and the shape of the conductor pattern are optimally designed is 76 GHz to 78 GHz (center frequency 77 GHz) for normally incident TM mode electromagnetic waves. In the band, it was found to have an absorption rate of at least 99.46%, very similar to the TE mode (99.47%). Through this, it can be confirmed that a metamaterial absorber was designed that shows properties independent of the polarization of the incident electromagnetic wave.
  • the metamaterial absorber according to Example 2 was shown to exhibit an absorption rate of at least 98.35% even when the angle of incidence changes, as shown in reference numeral 530 and Table 4 below, and was found to have an absorption rate of at least 98.35%, without a significant effect on the angle of incidence, from 76 GHz to 78 GHz (center It was found to show very good performance in the 77 GHz frequency band.
  • Figure 6 is a diagram for explaining the operation of absorbing electromagnetic waves in a metamaterial absorber according to an embodiment.
  • the metamaterial absorber according to one embodiment is formed by arranging a plurality of unit cells according to the first embodiment in a two-dimensional array structure, and the metamaterial absorber according to the first embodiment and a plurality of unit cells according to the second embodiment. It may be at least one absorber among the metamaterial absorbers according to the second embodiment formed by arranging unit cells in a two-dimensional array structure.
  • the unit cell according to the first embodiment is a conductor consisting of a square ring portion and first to fourth protrusions that are each perpendicular to the four sides of the square ring portion and extend inward from the center point of the four sides of the square ring portion. It may be a unit cell that has a pattern and the size and shape of each component constituting the unit cell are designed to be optimal and operates in the 27 GHz to 29 GHz (center frequency 28 GHz) band.
  • the unit cell according to the second embodiment includes a square ring portion and first to first to four sides that are perpendicular to the four sides of the square ring portion and extend inwardly by a gap of a preset size from the center point of the four sides of the square ring portion. It may be a unit cell that has a conductor pattern consisting of a fourth protrusion, and that operates in the 76 GHz to 78 GHz (center frequency 77 GHz) band by optimally designing the size and shape of each component constituting the unit cell.
  • the metamaterial absorber when an electromagnetic wave is incident (step 610), the metamaterial absorber can form an induced current (step 620), form a magnetic field (step 630), and absorb the electromagnetic wave (step 640).
  • absorbing electromagnetic waves may mean that the metamaterial absorber absorbs energy contained in electromagnetic waves. Additionally, the absorption of electromagnetic waves by the metamaterial absorber may not be an active operation of the metamaterial absorber to absorb electromagnetic waves, but may be a passive effect depending on the physical components and electromagnetic characteristics of the metamaterial absorber.
  • electromagnetic waves of broadband frequencies may be incident on the metamaterial absorber at various angles of incidence.
  • an induced current may be formed simultaneously in the first metal layer and the second metal layer (step 620).
  • An induced magnetic field may be formed (step 300) in the first and second intermediate layer regions by the induced current of the first metal layer and the induced current of the second metal layer, and the electromagnetic wave and induced magnetic field incident on the metamaterial absorber are impedance matched. It can magnetically resonate.
  • the metamaterial absorber can absorb the electromagnetic wave (step 400).
  • the operating frequency of the metamaterial absorber can be determined depending on the size and shape of the plurality of unit cells that make up the metamaterial absorber, and since the magnitude of the induced magnetic field is maximum when the operating frequency is the resonance frequency, the metamaterial absorber resonates. It can absorb electromagnetic waves to the maximum at that frequency.
  • the metamaterial absorber according to the present invention can maintain the electromagnetic wave absorption rate constant even when the angle of incidence of the incident electromagnetic wave changes.
  • the metamaterial absorber according to the present invention has an operating bandwidth with a constant operating frequency and can maintain a constant electromagnetic wave absorption rate within the operating bandwidth range.
  • the metamaterial absorber according to the present invention may be flexible, thin, and have a relatively low manufacturing cost. Therefore, the metamaterial absorber can maximize electromagnetic wave absorption efficiency.

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Abstract

La présente invention concerne une cellule unitaire d'un absorbeur de métamatériaux. La cellule unitaire de l'absorbeur de métamatériaux selon un mode de réalisation peut comprendre : une première couche métallique comprenant un motif conducteur constitué d'une partie annulaire carrée et des première à quatrième saillies qui sont perpendiculaires aux quatre côtés de la partie annulaire carrée, respectivement, et s'étendent vers l'intérieur à partir des points centraux des quatre côtés de la partie annulaire carrée ; une couche de résistance disposée sur la surface inférieure de la première couche métallique ; et une seconde couche métallique disposée sur la surface inférieure de la couche de résistance, la couche de résistance pouvant avoir une épaisseur de 0,05 mm à 0,15 mm et une résistance de feuille de 530 Ω·sq-1 à 550 Ω·sq-1 et augmenter la largeur de bande de fonctionnement à une fréquence de fonctionnement.
PCT/KR2023/020500 2022-12-13 2023-12-13 Cellule unitaire d'absorbeur de métamatériaux souple et mince pour 28 ghz et 77 ghz ayant une largeur de bande de fonctionnement et absorbeur de métamatériaux la comprenant Ceased WO2024128785A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN119181983B (zh) * 2024-09-09 2025-09-26 三峡大学 水-金属混合超材料吸波器及其应用
CN120127416B (zh) * 2025-03-10 2025-12-16 中国矿业大学(北京) 一种基于方矩形多嵌套结构的超表面吸波体

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100046579A (ko) * 2008-10-27 2010-05-07 한국전자통신연구원 음의 유전율, 투자율 및 굴절률을 갖는 평판형 메타 물질, 그 메타 메질을 포함한 평판형 메타 물질 구조체 및 그 구조체를 포함한 안테나 시스템
KR101109530B1 (ko) * 2004-02-27 2012-02-09 미츠비시 가스 가가쿠 가부시키가이샤 전파 흡수체 및 전파 흡수체의 제조 방법
CN104485515A (zh) * 2014-10-27 2015-04-01 武汉市工程科学技术研究院 加载集总元件的宽带吸波材料
KR20160101290A (ko) * 2015-02-16 2016-08-25 한국전자통신연구원 전자파 저감 기능을 가지는 무선 통신 기기의 커버 액세서리
CN106450795A (zh) * 2016-10-21 2017-02-22 西北工业大学 一种双频极化不敏感单层超材料吸波结构
KR20230103929A (ko) * 2021-12-30 2023-07-07 한양대학교 산학협력단 적정 동작 대역폭을 가지고, 유연하고 얇은 5.8GHz 및 10GHz용 메타물질 흡수체의 단위셀 및 이를 포함하는 메타물질 흡수체

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102468462B1 (ko) 2021-06-10 2022-11-21 한양대학교 산학협력단 유연하고 얇은 메타물질 흡수체의 단위셀 및 이를 포함하는 메타물질 흡수체

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101109530B1 (ko) * 2004-02-27 2012-02-09 미츠비시 가스 가가쿠 가부시키가이샤 전파 흡수체 및 전파 흡수체의 제조 방법
KR20100046579A (ko) * 2008-10-27 2010-05-07 한국전자통신연구원 음의 유전율, 투자율 및 굴절률을 갖는 평판형 메타 물질, 그 메타 메질을 포함한 평판형 메타 물질 구조체 및 그 구조체를 포함한 안테나 시스템
CN104485515A (zh) * 2014-10-27 2015-04-01 武汉市工程科学技术研究院 加载集总元件的宽带吸波材料
KR20160101290A (ko) * 2015-02-16 2016-08-25 한국전자통신연구원 전자파 저감 기능을 가지는 무선 통신 기기의 커버 액세서리
CN106450795A (zh) * 2016-10-21 2017-02-22 西北工业大学 一种双频极化不敏感单层超材料吸波结构
KR20230103929A (ko) * 2021-12-30 2023-07-07 한양대학교 산학협력단 적정 동작 대역폭을 가지고, 유연하고 얇은 5.8GHz 및 10GHz용 메타물질 흡수체의 단위셀 및 이를 포함하는 메타물질 흡수체

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