WO2023106532A1 - 동작 대역폭을 가지고, 유연하고 얇은 5.8ghz 및 10ghz용 메타물질 흡수체의 단위셀 및 이를 포함하는 메타물질 흡수체 - Google Patents
동작 대역폭을 가지고, 유연하고 얇은 5.8ghz 및 10ghz용 메타물질 흡수체의 단위셀 및 이를 포함하는 메타물질 흡수체 Download PDFInfo
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- WO2023106532A1 WO2023106532A1 PCT/KR2022/009575 KR2022009575W WO2023106532A1 WO 2023106532 A1 WO2023106532 A1 WO 2023106532A1 KR 2022009575 W KR2022009575 W KR 2022009575W WO 2023106532 A1 WO2023106532 A1 WO 2023106532A1
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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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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0088—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a plurality of shielding layers; combining different shielding material structure
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
Definitions
- the present invention relates to a metamaterial absorber, and more particularly, to a unit cell of a metamaterial absorber having flexible and thin characteristics and an operating bandwidth at 5.8 GHz and 10 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 mainly based on mixed materials such as ferrite materials, but these electromagnetic wave absorbers have disadvantages in that they are bulky, heavy, and expensive. Therefore, recently, an electromagnetic wave absorber using a metamaterial has been proposed.
- Metamaterials are artificially designed materials that include both electric and magnetic elements to have properties not found in nature, and have properties that facilitate electromagnetic wave absorption. That is, the metamaterial absorber is implemented by using a metamaterial having a high electromagnetic wave absorption rate.
- the conventional metamaterial absorber has a high absorptance for electromagnetic waves incident vertically, while the absorptivity decreases for electromagnetic waves incident at different angles, and when the electromagnetic waves are incident at a large inclination angle, the absorptivity decreases. .
- the conventional metamaterial absorber has no operating bandwidth or a very narrow operating bandwidth because the operating frequency is limited to a specific frequency. Therefore, there is a limit in that the electromagnetic wave absorption rate of the metamaterial absorber is maintained high only at a specific frequency in the form of a single peak.
- metamaterial absorbers have limitations in that they are not flexible, have a large thickness, and have relatively high manufacturing costs.
- One object of the present invention is to provide a unit cell of a metamaterial absorber for 5.8 GHz and 10 GHz that maintains a constant electromagnetic wave absorption even when the incident angle of the incident electromagnetic wave is changed.
- Another object of the present invention is to provide a unit cell of a metamaterial absorber for 5.8 GHz and 10 GHz in which the operating frequency has a constant operating bandwidth and the electromagnetic wave absorption rate 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 5.8 GHz and 10 GHz that is flexible, has a thin thickness, and has a relatively low manufacturing cost.
- the object of the present invention is not limited to the above-mentioned objects, and may be expanded in various ways without departing from the spirit and scope of the present invention.
- a unit cell of a metamaterial absorber is a first metal layer including at least one concentric ring-shaped conductor pattern, disposed on a lower surface of the first metal layer, and a poly
- a first intermediate layer composed of mid, a resistor layer disposed on the lower surface of the first intermediate layer, a second intermediate layer disposed on the lower surface of the resistor layer and composed of polyimide, and a second metal layer disposed on the lower surface of the second intermediate layer can include
- the resistive layer may increase an operating bandwidth of an operating frequency.
- the resistor layer may have a thickness of 0.05 mm to 0.15 mm.
- a sheet resistance of the resistor layer may be 530 ⁇ sq -1 to 550 ⁇ sq -1 .
- the operating bandwidth of the operating frequency may be a center frequency of 5.8 GHz and a band of 5.55 GHz to 6.05 GHz.
- the unit cell of the metamaterial absorber may have an electromagnetic wave absorption rate of 97% or more for an incident angle of 45° within the operating bandwidth range.
- the first metal layer may include a first conductor pattern having a width of 0.3 mm to 0.5 mm and a radius of 5.0 mm to 5.8 mm.
- the thickness of the first metal layer may be 30 ⁇ m to 40 ⁇ m.
- the horizontal length of the first intermediate layer may be 20 mm to 30 mm.
- the vertical length of the first intermediate layer may be 20 mm to 30 mm.
- the thickness of the first intermediate layer may be 0.1 mm to 0.3 mm.
- the horizontal length of the resistor layer may be 20 mm to 30 mm.
- a vertical length of the resistor layer may be 20 mm to 30 mm.
- the horizontal length of the second intermediate layer may be 20 mm to 30 mm.
- the vertical length of the second intermediate layer may be 20 mm to 30 mm.
- the second intermediate layer may have a thickness of 0.4 mm to 0.6 mm.
- the dielectric constant of the first intermediate layer and the second intermediate layer may be 3.5.
- a dielectric loss tangent of the first intermediate layer and the second intermediate layer may be 0.0027.
- the horizontal length of the second metal layer may be 20 mm to 30 mm.
- a vertical length of the second metal layer may be 20 mm to 30 mm.
- the second metal layer may have a thickness of 30 ⁇ m to 40 ⁇ m.
- the operating bandwidth of the operating frequency may be a center frequency of 10 GHz and a band of 9.5 GHz to 10.5 GHz.
- the unit cell of the metamaterial absorber may have an electromagnetic wave absorption rate of 97% or more for an incident angle of 45° within the operating bandwidth range.
- the first metal layer may include a second conductor pattern.
- the second conductor pattern may include a first concentric circular ring and a second concentric circular ring having a center coincident with the first concentric circular ring and surrounding the first concentric circular ring. Widths of the first concentric circular ring and the second concentric circular ring may be 0.3 mm to 0.5 mm.
- the radius of the first concentric circular ring may be 1.8 mm to 2.0 mm.
- a radius of the second concentric circular ring may be 3.2 mm to 3.4 mm.
- the thickness of the first metal layer may be 30 ⁇ m to 40 ⁇ m.
- the horizontal length of the first intermediate layer may be 10 mm to 20 mm.
- the vertical length of the first intermediate layer may be 10 mm to 20 mm.
- the thickness of the first intermediate layer may be 0.1 mm to 0.3 mm.
- the horizontal length of the resistor layer may be 10 mm to 20 mm.
- a vertical length of the resistor layer may be 10 mm to 20 mm.
- the horizontal length of the second intermediate layer may be 10 mm to 20 mm.
- the vertical length of the second intermediate layer may be 10 mm to 20 mm.
- the second intermediate layer may have a thickness of 0.4 mm to 0.6 mm.
- the dielectric constant of the first intermediate layer and the second intermediate layer may be 3.5.
- a dielectric loss tangent of the first intermediate layer and the second intermediate layer may be 0.0027.
- the horizontal length of the second metal layer may be 10 mm to 20 mm.
- a vertical length of the second metal layer may be 10 mm to 20 mm.
- the second metal layer may have a thickness of 30 ⁇ m to 40 ⁇ m.
- a metamaterial absorber may include a plurality of unit cells.
- the plurality of unit cells may be arranged on the same plane to form a flat plate structure.
- Each of the plurality of unit cells includes a first metal layer including at least one concentric ring-shaped conductor pattern, a first intermediate layer disposed on the lower surface of the first metal layer and made of polyimide, and disposed on the lower surface of the first intermediate layer. It may include a resistor layer, a second intermediate layer disposed on a lower surface of the resistor layer and made of polyimide, and a second metal layer disposed on a lower surface of the second intermediate layer.
- the resistive layer may increase an operating bandwidth of an operating frequency.
- the resistor layer may have a thickness of 0.05 mm to 0.15 mm.
- a sheet resistance of the resistor layer may be 530 ⁇ sq -1 to 550 ⁇ sq -1 .
- the unit cell of the metamaterial absorber and the metamaterial absorber according to the present invention can maintain constant electromagnetic wave absorptivity even when the incident angle of the incident electromagnetic wave is changed.
- the unit cell of the metamaterial absorber and the metamaterial absorber according to the present invention have an operating bandwidth with a constant operating frequency, and can maintain a constant electromagnetic wave absorption within the range of the operating bandwidth.
- the unit cell and metamaterial absorber of the metamaterial absorber according to the present invention may be flexible, thin, and have relatively low manufacturing cost.
- the unit cell of the metamaterial absorber and the metamaterial absorber can maximize electromagnetic wave absorption efficiency.
- the unit cell and metamaterial absorber of the metamaterial absorber according to the present invention are used in an automatic toll collection system such as a high-pass in a 5.8 GHz band, multiple reflections from ceilings, pillars, etc. of buildings around the automatic toll collection system Since performance degradation and malfunction of information communication devices due to signals are minimized, smooth passage of the automatic toll collection system can be secured.
- an automatic toll collection system such as a high-pass in a 5.8 GHz band
- the unit cell and metamaterial absorber of the metamaterial absorber according to the present invention are used in a naval vessel in the 10 GHz band, the false target of the radar due to the reflected wave by the mast or pier around the naval vessel is reduced, Radar performance of naval ships could be improved.
- FIG. 1 is a perspective view showing a unit cell of a metamaterial absorber of the present invention.
- FIG. 2 is a cross-sectional view showing a stacked structure of unit cells of the metamaterial absorber of FIG. 1;
- FIG 3 is a front view of a unit cell of a metamaterial absorber for 5.8 GHz according to embodiments of the present invention.
- FIG. 4 is a perspective view of a unit cell of the metamaterial absorber for 5.8 GHz of FIG. 3 .
- FIG. 5 is a view showing the first intermediate layer separated from the perspective view of FIG. 4 .
- FIG. 6 is a view showing the resistor layer separated from the perspective view of FIG. 4 .
- FIG. 7 is a view showing the second intermediate layer separated from the perspective view of FIG. 4 .
- FIG. 8 is a view showing the second metal layer separated from the perspective view of FIG. 4 .
- FIG. 9 is a graph showing the electromagnetic wave absorptance according to the incident angle in the 5.55 GHz to 6.05 GHz band when electromagnetic waves polarized in TE mode are incident on the unit cell of the 5.8 GHz metamaterial absorber of FIG. 3 .
- FIG. 10 is a graph showing the electromagnetic wave absorption rate according to the incident angle in the 5.55 GHz to 6.05 GHz band when electromagnetic waves polarized in the TM mode are incident on the unit cell of the 5.8 GHz metamaterial absorber of FIG. 3 .
- FIG. 11 is a front view of a unit cell of a metamaterial absorber for 10 GHz according to embodiments of the present invention.
- FIG. 12 is a perspective view of a unit cell of the 10 GHz metamaterial absorber of FIG. 11;
- FIG. 13 is a view showing the first intermediate layer separated from the perspective view of FIG. 12;
- FIG. 14 is a view showing the resistor layer separated from the perspective view of FIG. 12 .
- FIG. 15 is a view showing the second intermediate layer separated from the perspective view of FIG. 12;
- FIG. 16 is a view showing the second metal layer separated from the perspective view of FIG. 12 .
- FIG. 17 is a graph showing the electromagnetic wave absorption rate according to the incident angle in the 9.5 GHz to 10.5 GHz band when electromagnetic waves polarized in TE mode are incident on the unit cell of the 10 GHz metamaterial absorber of FIG. 11 .
- FIG. 18 is a graph showing the electromagnetic wave absorption rate according to the incident angle in the 9.5 GHz to 10.5 GHz band when electromagnetic waves polarized in TM mode are incident on the unit cell of the 10 GHz metamaterial absorber of FIG. 11 .
- FIG. 19 is a view showing an example of a metamaterial absorber in which unit cells of the metamaterial absorber of FIG. 1 are arranged on the same plane.
- FIG. 20 is a flowchart illustrating an operation of absorbing electromagnetic waves by the metamaterial absorber of FIG. 19 .
- a (e.g., first) element When a (e.g., first) element is referred to as being "(functionally or communicatively) coupled to" or “connected to" another (e.g., second) element, that element refers to the other (e.g., second) element. It may be directly connected to the component or connected through another component (eg, a third component).
- the expression “device configured to” can mean that the device is “capable of” in conjunction with other devices or components.
- a processor configured (or configured) to perform A, B, and C may include a dedicated processor (eg, embedded processor) to perform the operation, or by executing one or more software programs stored in a memory device.
- a dedicated processor eg, embedded processor
- a general-purpose processor eg, CPU or application processor
- FIG. 1 is a perspective view showing a unit cell 10 of the metamaterial absorber of the present invention
- FIG. 2 is a cross-sectional view showing a laminated structure of the unit cell 10 of the metamaterial absorber of FIG. 1 .
- the unit cell 10 of the metamaterial absorber of the present invention includes a first metal layer 100, a first intermediate layer 200, a resistor layer 300, a second intermediate layer 400, and a second intermediate layer 400. 2 metal layers 500 may be included.
- the unit cell 10 of the metamaterial absorber includes a first metal layer 100, a first intermediate layer 200, a resistor layer 300, a second intermediate layer 400, and a second intermediate layer 400. It may have a five-layer structure in which the metal layer 500 is stacked.
- the unit cell 10 of the metamaterial absorber includes a first metal layer 100 including at least one concentric ring-shaped conductor pattern, and a first metal layer 100 disposed on a lower surface of the first metal layer 100 and made of polyimide.
- 1 intermediate layer 200, a resistor layer 300 disposed on the lower surface of the first intermediate layer 200, a second intermediate layer 400 disposed on the lower surface of the resistor layer 300 and composed of polyimide, and a second intermediate layer ( 400) may include a second metal layer 500 disposed on the lower surface.
- the prior art metamaterial absorber has no operating bandwidth because its operating frequency is limited to a specific frequency, or has a very narrow operating bandwidth. Therefore, the electromagnetic wave absorption rate of the prior art metamaterial absorber has a limit in that it is maintained high only at a specific frequency in the form of a single peak.
- the unit cell 10 of the metamaterial absorber of the present invention has an operating bandwidth with a constant operating frequency, and the electromagnetic wave absorption rate can be maintained constant within the operating bandwidth range.
- the resistor layer 300 may increase an operating bandwidth of an operating frequency for electromagnetic wave absorption.
- the resistor layer 300 may have a thickness of 0.05 mm to 0.15 mm, and a sheet resistance of the resistor layer 300 may be 530 ⁇ sq ⁇ 1 to 550 ⁇ sq ⁇ 1 .
- the unit cell 10 of the metamaterial absorber of the present invention can maintain a constant electromagnetic wave absorptivity even when the incident angle of the incident electromagnetic wave is changed.
- the unit cell 10 of the metamaterial absorber according to the present invention may be flexible, thin, and have a relatively low manufacturing cost.
- FIGS. 3 to 10 an embodiment of the unit cell 10a of the metamaterial absorber for 5.8 GHz of the present invention will be described through FIGS. 3 to 10
- FIGS. 11 to 18 an embodiment of the unit cell 10b of the metamaterial absorber for 10 GHz of the present invention will be described through FIGS. 11 to 18.
- FIG. 3 is a front view of a unit cell 10a of a metamaterial absorber for 5.8 GHz according to embodiments of the present invention
- FIG. 4 is a perspective view of a unit cell 10a of a metamaterial absorber for 5.8 GHz of FIG. 5 is a view showing the first intermediate layer 200a separated from the perspective view of FIG. 4
- FIG. 6 is a view showing the resistor layer 300a separated from the perspective view of FIG. 4
- FIG. It is a view showing the intermediate layer 400a separated
- FIG. 8 is a view showing the second metal layer 500a separated from the perspective view of FIG. 4 .
- the electromagnetic wave absorption rate can be maximized in the 5.8 GHz band.
- the operating frequency of the unit cell 10a of the metamaterial absorber may have a constant operating bandwidth.
- the operating bandwidth of the operating frequency may be a center frequency of 5.8 GHz and a band of 5.55 GHz to 6.05 GHz.
- the unit cell 10a of the metamaterial absorber may have an electromagnetic wave absorption rate of 97% or more for an incident angle of 45° within the operating bandwidth range.
- the unit cell 10a of the metamaterial absorber includes a first metal layer 100a including a first conductor pattern having a concentric circular ring shape, disposed on the lower surface of the first metal layer 100a and composed of polyimide.
- the first intermediate layer 200a, the resistor layer 300a disposed on the lower surface of the first intermediate layer 200a, the second intermediate layer 400a disposed on the lower surface of the resistor layer 300a and made of polyimide, and the second intermediate layer A second metal layer 500a disposed on the lower surface of 400a may be included.
- the metamaterial absorber unit cell can minimize electromagnetic wave reflection in the 5.8 GHz band depending on how the conductor pattern of the first metal layer 100a is designed. That is, since the impedance of the air is 1, it is sufficient to design the impedance of the entire conductor pattern to be 1 in the 5.8 GHz band.
- the first metal layer 100a may include a first conductor pattern having a concentric circular ring width (Wa) of 0.3 mm to 0.5 mm and a concentric circular ring radius (Ra) of 5.0 mm to 5.8 mm. there is.
- the thickness of the first metal layer 100a may be 30 ⁇ m to 40 ⁇ m.
- the first intermediate layer 200a may be disposed on the lower surface of the first metal layer 100a and made of polyimide.
- the horizontal length (Pa) of the first intermediate layer (200a) may be 20 mm to 30 mm.
- the vertical length of the first intermediate layer 200a may be 20 mm to 30 mm.
- the thickness TP1 of the first intermediate layer 200a may be 0.1 mm to 0.3 mm.
- the resistor layer 300a may be disposed on the lower surface of the first intermediate layer 200a. Since the resistive layer 300a has a constant sheet resistance, an operating bandwidth of an operating frequency for electromagnetic wave absorption can be increased.
- the sheet resistance of the resistor layer 300a may be 530 ⁇ sq ⁇ 1 to 550 ⁇ sq ⁇ 1 .
- the thickness TR of the resistor layer 300a may be 0.05 mm to 0.15 mm.
- the resistor layer 300a may be designed to have a thickness of 0.1 mm to minimize an effect on the flexibility of the unit cell 10a of the metamaterial absorber.
- the horizontal length (Pa) of the resistor layer 300a may be 20 mm to 30 mm.
- the vertical length of the resistor layer 300a may be 20 mm to 30 mm.
- the unit cell 10a of the metamaterial absorber can maintain an operating frequency at which electromagnetic waves are absorbed in the 5.8GHz ⁇ 0.25GHz band even when the incident angle changes.
- the second intermediate layer 400a may be disposed on the lower surface of the resistor layer 300a and made of polyimide.
- the horizontal length (Pa) of the second intermediate layer 400a may be 20 mm to 30 mm.
- the vertical length of the second intermediate layer 400a may be 20 mm to 30 mm.
- the thickness TP2 of the second intermediate layer 400a may be 0.4 mm to 0.6 mm.
- the unit cell 10a of the metamaterial absorber includes the first intermediate layer 200a and the second intermediate layer 400a made of polyimide, so that it is flexible, thin, and has a relatively low manufacturing cost.
- the first intermediate layer 200a and the second intermediate layer 400a may electrically confine and store electromagnetic waves incident on the unit cell 10a of the metamaterial absorber and attenuate the electromagnetic waves in the 5.8 GHz band.
- the size of the first intermediate layer 200a and the second intermediate layer 400a included in the unit cell 10a of the metamaterial absorber may be 25 ⁇ 25 mm 2 .
- the dielectric constant of the first intermediate layer 200a and the second intermediate layer 400a may be 3.5.
- the dielectric loss tangent of the first intermediate layer 200a and the second intermediate layer 400a may be 0.0027.
- the unit cell 10a of the metamaterial absorber in the 5.8 GHz band has an absorption rate of 99% or more for normally incident electromagnetic waves.
- the second metal layer 500a may be disposed on the lower surface of the second intermediate layer 400a.
- the second metal layer 500a may perform a function of preventing electromagnetic waves entering the unit cell 10a of the metamaterial absorber from escaping.
- the second metal layer 500a may be formed of copper.
- the horizontal length (Pa) of the second metal layer 500a may be 20 mm to 30 mm.
- the vertical length of the second metal layer 500a may be 20 mm to 30 mm.
- the thickness TC of the second metal layer 500a may be 30 ⁇ m to 40 ⁇ m.
- FIG. 9 is a graph showing the electromagnetic wave absorption rate according to the incident angle in the 5.55 GHz to 6.05 GHz band when electromagnetic waves polarized in the TE mode are incident on the unit cell 10a of the metamaterial absorber for 5.8 GHz of FIG. 3 .
- the unit cell 10a of the metamaterial absorber can maintain an electromagnetic wave absorption rate of 97% or more for electromagnetic waves polarized in the TE mode even when the incident angle is changed in the 5.55 GHz to 6.05 GHz band.
- the unit cell 10a of the metamaterial absorber shows an electromagnetic wave absorption rate of 99.93% or more in a band of 5.55 GHz to 6.05 GHz.
- the unit cell 10a of the metamaterial absorber shows an electromagnetic wave absorption rate of 99.89% or more in a band of 5.55 GHz to 6.05 GHz.
- the unit cell 10a of the metamaterial absorber shows an electromagnetic wave absorption rate of 99.48% or more in a band of 5.55 GHz to 6.05 GHz.
- the unit cell 10a of the metamaterial absorber shows an electromagnetic wave absorption rate of 97.50% or more in a band of 5.55 GHz to 6.05 GHz.
- FIG. 10 is a graph showing the electromagnetic wave absorption rate according to the incident angle in the 5.55 GHz to 6.05 GHz band when electromagnetic waves polarized in the TM mode are incident on the unit cell 10a of the metamaterial absorber for 5.8 GHz of FIG. 3 .
- the unit cell 10a of the metamaterial absorber can maintain an electromagnetic wave absorption rate of 97% or more for electromagnetic waves polarized in the TM mode even when the incident angle is changed in the 5.55 GHz to 6.05 GHz band.
- the unit cell 10a of the metamaterial absorber shows an electromagnetic wave absorption rate of 99.93% or more in a band of 5.55 GHz to 6.05 GHz.
- the unit cell 10a of the metamaterial absorber shows an electromagnetic wave absorption rate of 99.94% or more in a band of 5.55 GHz to 6.05 GHz.
- the unit cell 10a of the metamaterial absorber shows an electromagnetic wave absorption rate of 99.61% or more in a band of 5.55 GHz to 6.05 GHz.
- the unit cell 10a of the metamaterial absorber shows an electromagnetic wave absorption rate of 97.52% or more in a band of 5.55 GHz to 6.05 GHz.
- the unit cell 10a of the metamaterial absorber according to the present invention can maintain a constant electromagnetic wave absorptivity even when the incident angle of the incident electromagnetic wave is changed in the 5.8 GHz band.
- the unit cell 10a of the metamaterial absorber according to the present invention has an operating frequency of 5.8 GHz ⁇ 0.25 GHz, and can maintain a constant electromagnetic wave absorption rate within the operating bandwidth range.
- the unit cell 10a of the metamaterial absorber according to the present invention may be flexible, thin, and have a relatively low manufacturing cost. Therefore, the unit cell 10a of the metamaterial absorber can maximize electromagnetic wave absorption efficiency.
- the unit cell 10a of the metamaterial absorber according to the present invention when used in an automatic toll collection system such as high-pass in the 5.8 GHz band, multiple signals reflected from ceilings and pillars of buildings around the automatic toll collection system Since performance degradation and malfunction of information and communication devices due to
- FIG. 11 is a front view of a unit cell 10b of a metamaterial absorber for 10 GHz according to embodiments of the present invention
- FIG. 12 is a perspective view of a unit cell 10b of a metamaterial absorber for 10 GHz of FIG. 13 is a view showing the first intermediate layer 200b separated from the perspective view of FIG. 12
- FIG. 14 is a view showing the resistor layer 300b separated from the perspective view of FIG. 12
- FIG. 15 shows the second intermediate layer 200b from the perspective view of FIG. It is a view showing the intermediate layer 400b separated
- FIG. 16 is a view showing the second metal layer 500b separated from the perspective view of FIG. 12 .
- the electromagnetic wave absorption rate can be maximized in the 10 GHz band.
- the operating frequency of the unit cell 10b of the metamaterial absorber may have a constant operating bandwidth.
- the operating bandwidth of the operating frequency may be a center frequency of 10 GHz and a band of 9.5 GHz to 10.5 GHz.
- the unit cell 10b of the metamaterial absorber may have an electromagnetic wave absorption rate of 97% or more for an incident angle of 45° within the operating bandwidth range.
- the unit cell 10b of the metamaterial absorber is disposed on a first metal layer 100b including a second conductor pattern including two concentric circular ring shapes, and is disposed on the lower surface of the first metal layer 100b and is made of polyimide.
- a first intermediate layer 200b configured, a resistor layer 300b disposed on the lower surface of the first intermediate layer 200b, a second intermediate layer 400b disposed on the lower surface of the resistor layer 300b and made of polyimide, and 2 may include a second metal layer 500b disposed on the lower surface of the intermediate layer 400b.
- the metamaterial absorber unit cell can minimize electromagnetic wave reflection in the 10 GHz band depending on how the conductor pattern of the first metal layer 100b is designed. That is, since the impedance of the atmosphere is 1, it is sufficient to design the impedance of the entire conductor pattern to be 1 in the 10 GHz band.
- the second conductor pattern includes a first concentric circular ring CRR1 and a second concentric circular ring CRR2 whose center coincides with the first concentric circular ring CRR1 and surrounds the first concentric circular ring CRR1. can do.
- the width Wb1 of the first concentric circular ring may be 0.3 mm to 0.5 mm.
- a width Wb2 of the second concentric circular ring may be 0.3 mm to 0.5 mm.
- the radius Rb1 of the first concentric circular ring may be 1.8 mm to 2.0 mm.
- the radius Rb2 of the second concentric circular ring may be 3.2 mm to 3.4 mm.
- the thickness of the first metal layer 100b may be 30 ⁇ m to 40 ⁇ m.
- the first intermediate layer 200b may be disposed on the lower surface of the first metal layer 100b and made of polyimide.
- the horizontal length (Pa) of the first intermediate layer (200b) may be 10 mm to 20 mm.
- the vertical length of the first intermediate layer 200b may be 10 mm to 20 mm.
- the thickness TP1 of the first intermediate layer 200b may be 0.1 mm to 0.3 mm.
- the resistor layer 300b may be disposed on the lower surface of the first intermediate layer 200b. Since the resistive layer 300b has a certain sheet resistance, an operating bandwidth of an operating frequency for electromagnetic wave absorption can be increased.
- the sheet resistance of the resistor layer 300b may be 530 ⁇ sq ⁇ 1 to 550 ⁇ sq ⁇ 1 .
- the thickness TR of the resistor layer 300b may be 0.05 mm to 0.15 mm.
- the resistor layer 300b may be designed to have a thickness of 0.1 mm to minimize an effect on the flexibility of the unit cell 10b of the metamaterial absorber.
- the horizontal length (Pa) of the resistor layer 300b may be 10 mm to 20 mm.
- the vertical length of the resistor layer 300b may be 10 mm to 20 mm.
- the unit cell 10b of the metamaterial absorber can maintain an operating frequency at which electromagnetic waves are absorbed in the 10GHz ⁇ 0.5GHz band even when the incident angle changes.
- the second intermediate layer 400b may be disposed on the lower surface of the resistor layer 300b and made of polyimide.
- the horizontal length (Pa) of the second intermediate layer 400b may be 10 mm to 20 mm.
- the vertical length of the second intermediate layer 400b may be 10 mm to 20 mm.
- the thickness TP2 of the second intermediate layer 400b may be 0.4 mm to 0.6 mm.
- the unit cell 10b of the metamaterial absorber may include a first intermediate layer 200b and a second intermediate layer 400b made of polyimide, so that it is flexible, thin, and has a relatively low manufacturing cost.
- the first intermediate layer 200b and the second intermediate layer 400b electrically confine and store the electromagnetic waves incident on the unit cell 10b of the metamaterial absorber and attenuate the electromagnetic waves in the 10 GHz band.
- the size of the first intermediate layer 200b and the second intermediate layer 400b included in the unit cell 10b of the metamaterial absorber may be 15 ⁇ 15 mm 2 .
- the dielectric constant of the first intermediate layer 200b and the second intermediate layer 400b may be 3.5.
- the dielectric loss tangent of the first intermediate layer 200b and the second intermediate layer 400b may be 0.0027.
- the unit cell 10b of the metamaterial absorber has an absorption rate of 99% or more for normally incident electromagnetic waves in the 10 GHz band.
- the second metal layer 500b may be disposed on the lower surface of the second intermediate layer 400b.
- the second metal layer 500b may perform a function of preventing electromagnetic waves entering the unit cell 10b of the metamaterial absorber from escaping.
- the second metal layer 500b may be formed of copper.
- the horizontal length (Pa) of the second metal layer 500b may be 10 mm to 20 mm.
- the vertical length of the second metal layer 500b may be 10 mm to 20 mm.
- the thickness TC of the second metal layer 500b may be 30 ⁇ m to 40 ⁇ m.
- 17 is a graph showing the electromagnetic wave absorption rate according to the incident angle in the 9.5 GHz to 10.5 GHz band when electromagnetic waves polarized in TE mode are incident on the unit cell 10b of the 10 GHz metamaterial absorber of FIG. 11 .
- the unit cell 10b of the metamaterial absorber can maintain an electromagnetic wave absorption rate of 97% or more for electromagnetic waves polarized in the TE mode even when the incident angle changes in the 9.5 GHz to 10.5 GHz band.
- the unit cell 10b of the metamaterial absorber shows an electromagnetic wave absorption rate of 99.52% or more in a band of 9.5 GHz to 10.5 GHz.
- the unit cell 10b of the metamaterial absorber shows an electromagnetic wave absorption rate of 99.51% or more in a band of 9.5 GHz to 10.5 GHz.
- the unit cell 10b of the metamaterial absorber shows an electromagnetic wave absorption rate of 99.17% or more in a band of 9.5 GHz to 10.5 GHz.
- the unit cell 10b of the metamaterial absorber shows an electromagnetic wave absorption rate of 97.32% or more in a band of 9.5 GHz to 10.5 GHz.
- FIG. 18 is a graph showing the electromagnetic wave absorption rate according to the incident angle in the 9.5 GHz to 10.5 GHz band when electromagnetic waves polarized in the TM mode are incident on the unit cell 10b of the 10 GHz metamaterial absorber of FIG. 11 .
- the unit cell 10b of the metamaterial absorber can maintain an electromagnetic wave absorption rate of 97% or more for electromagnetic waves polarized in the TM mode even when the incident angle changes in the 9.5 GHz to 10.5 GHz band.
- the unit cell 10b of the metamaterial absorber shows an electromagnetic wave absorption rate of 99.52% or more in a band of 9.5 GHz to 10.5 GHz.
- the unit cell 10b of the metamaterial absorber shows an electromagnetic wave absorption rate of 99.53% or more in a band of 9.5 GHz to 10.5 GHz.
- the unit cell 10b of the metamaterial absorber shows an electromagnetic wave absorption rate of 99.21% or more in a band of 9.5 GHz to 10.5 GHz.
- the unit cell 10b of the metamaterial absorber shows an electromagnetic wave absorption rate of 97.14% or more in a band of 9.5 GHz to 10.5 GHz.
- the unit cell 10b of the metamaterial absorber according to the present invention can maintain a constant electromagnetic wave absorptivity even when the incident angle of the incident electromagnetic wave is changed in the 10 GHz band.
- the unit cell 10b of the metamaterial absorber according to the present invention has an operating frequency of 10 GHz ⁇ 0.5 GHz, and can maintain a constant electromagnetic wave absorption within the operating bandwidth range.
- the unit cell 10b of the metamaterial absorber according to the present invention may be flexible, thin, and have a relatively low manufacturing cost. Therefore, the unit cell 10b of the metamaterial absorber can maximize electromagnetic wave absorption efficiency.
- the unit cell 10b of the metamaterial absorber according to the present invention when used in a naval vessel in the 10 GHz band, false targets of radar due to reflected waves by masts or piers around the naval vessel are reduced, The ship's radar performance can be improved.
- FIG. 19 is a view showing an example of a metamaterial absorber 1000 in which unit cells 10 of the metamaterial absorber of FIG. 1 are arranged on the same plane
- FIG. 20 is a view showing an example of the metamaterial absorber 1000 of FIG. It is a flowchart showing the operation of absorbing
- the metamaterial absorber 1000 may include a plurality of unit cells 10 having a rectangular shape.
- the plurality of unit cells 10 may be arranged on the same plane to form a flat plate structure to constitute the metamaterial absorber 1000.
- each of the plurality of unit cells 10 constituting the metamaterial absorber 1000 may have the same shape and size.
- the metamaterial absorber 1000 can absorb incident electromagnetic waves in a wide range.
- the metamaterial absorber 1000 forms an induced current (S200), forms a magnetic field (S300), and absorbs electromagnetic waves (S400) when electromagnetic waves are incident (S100).
- the meaning of absorbing electromagnetic waves may mean that the metamaterial absorber 1000 absorbs energy included in electromagnetic waves.
- the absorption of electromagnetic waves by the metamaterial absorber 1000 is not an active operation of the metamaterial absorber 1000 for absorbing electromagnetic waves, but a passive effect according to the physical components and electromagnetic characteristics of the metamaterial absorber 1000.
- electromagnetic waves of a broadband frequency may be incident at various incident angles to the metamaterial absorber 1000 (S100).
- an induced current may be simultaneously formed in the first metal layer 100 and the second metal layer 500 (S200).
- An induced magnetic field may be formed in the region of the intermediate layers 200 and 400 by the induced current of the first metal layer 100 and the induced current of the second metal layer 500 (S300). Electromagnetic waves incident to the metamaterial absorber 1000 and the induced magnetic field may magnetically resonate by impedance matching.
- the metamaterial absorber 1000 may absorb the electromagnetic wave (S400).
- the operating frequency of the meta-material absorber 1000 may be determined according to the size and shape of the plurality of unit cells 10 constituting the meta-material absorber 1000. Since the magnitude of the induced magnetic field is maximized when the operating frequency is the resonant frequency, the metamaterial absorber 1000 can absorb electromagnetic waves at the resonant frequency to the maximum.
- each of the plurality of unit cells 10 included in the metamaterial absorber 1000 includes a first metal layer 100 including at least one concentric circular ring-shaped conductor pattern, the first metal layer 100 ) disposed on the lower surface and made of polyimide, the first intermediate layer 200 disposed on the lower surface of the first intermediate layer 200, the resistor layer 300 disposed on the lower surface of the resistor layer 300 and made of polyimide It may include a second intermediate layer 400 configured, and a second metal layer 500 disposed on a lower surface of the second intermediate layer 400 .
- the resistor layer 300 may increase an operating bandwidth of an operating frequency.
- the resistor layer 300 may have a thickness of 0.05 mm to 0.15 mm.
- the sheet resistance of the resistor layer 300 may be 530 ⁇ sq ⁇ 1 to 550 ⁇ sq ⁇ 1 .
- the metamaterial absorber 1000 according to the present invention can maintain a constant electromagnetic wave absorptivity even when the incident angle of the incident electromagnetic wave is changed.
- the metamaterial absorber 1000 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 1000 according to the present invention may be flexible, thin, and have a relatively low manufacturing cost. Therefore, the metamaterial absorber 1000 can maximize electromagnetic wave absorption efficiency.
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Abstract
Description
Claims (16)
- 적어도 하나의 동심 원형 링 형상의 도체패턴을 포함하는 제1 금속층;상기 제1 금속층의 하면에 배치되고 폴리이미드로 구성되는 제1 중간층;상기 제1 중간층의 하면에 배치되는 저항체층;상기 저항체층의 하면에 배치되고 폴리이미드로 구성되는 제2 중간층; 및상기 제2 중간층의 하면에 배치되는 제2 금속층을 포함하고,상기 저항체층은 동작주파수의 동작 대역폭을 증가시키고,상기 저항체층의 두께는 0.05 mm 내지 0.15 mm이고,상기 저항체층의 면저항은 530 Ω·sq-1 내지 550 Ω·sq-1인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제1항에 있어서,상기 동작주파수의 상기 동작 대역폭은 중심주파수 5.8 GHz, 및 5.55 GHz 내지 6.05 GHz 대역이고,상기 동작 대역폭 범위 내에서, 입사각 45°에 대한 전자기파 흡수율이 97% 이상인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제1항에 있어서,상기 제1 금속층은 동심 원형 링의 폭이 0.3 mm 내지 0.5 mm이고, 동심 원형 링의 반지름이 5.0mm 내지 5.8mm인 제1 도체패턴을 포함하고,상기 제1 금속층의 두께는 30 μm 내지 40 μm인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제3항에 있어서,상기 제1 중간층의 가로 길이는 20 mm 내지 30 mm이고,상기 제1 중간층의 세로 길이는 20 mm 내지 30 mm이고,상기 제1 중간층의 두께는 0.1 mm 내지 0.3 mm인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제4항에 있어서,상기 저항체층의 가로 길이는 20 mm 내지 30 mm이고,상기 저항체층의 세로 길이는 20 mm 내지 30 mm인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제5항에 있어서,상기 제2 중간층의 가로 길이는 20 mm 내지 30 mm이고,상기 제2 중간층의 세로 길이는 20 mm 내지 30 mm이고,상기 제2 중간층의 두께는 0.4 mm 내지 0.6 mm인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제6항에 있어서,상기 제1 중간층 및 상기 제2 중간층의 유전 상수(dielectric constant)는 3.5이고,상기 제1 중간층 및 상기 제2 중간층의 유전 손실 탄젠트(dielectric loss tangent)는 0.0027인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제3항에 있어서,상기 제2 금속층의 가로 길이는 20 mm 내지 30 mm이고,상기 제2 금속층의 세로 길이는 20 mm 내지 30 mm이고,상기 제2 금속층의 두께는 30 μm 내지 40 μm인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제1항에 있어서,상기 동작주파수의 상기 동작 대역폭은 중심주파수 10 GHz, 및 9.5 GHz 내지 10.5 GHz 대역이고,상기 동작 대역폭 범위 내에서, 입사각 45°에 대한 전자기파 흡수율이 97% 이상인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제1항에 있어서,상기 제1 금속층은 제2 도체패턴을 포함하고,상기 제2 도체패턴은,제1 동심 원형 링; 및상기 제1 동심 원형 링과 중심이 일치하고, 상기 제1 동심 원형 링을 둘러싸는 제2 동심 원형 링을 포함하고,상기 제1 동심 원형 링 및 상기 제2 동심 원형 링의 폭은 0.3 mm 내지 0.5 mm이고,상기 제1 동심 원형 링의 반지름은 1.8 mm 내지 2.0 mm이고,상기 제2 동심 원형 링의 반지름은 3.2 mm 내지 3.4 mm이고,상기 제1 금속층의 두께는 30 μm 내지 40 μm인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제10항에 있어서,상기 제1 중간층의 가로 길이는 10 mm 내지 20 mm이고,상기 제1 중간층의 세로 길이는 10 mm 내지 20 mm이고,상기 제1 중간층의 두께는 0.1 mm 내지 0.3 mm인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제11항에 있어서,상기 저항체층의 가로 길이는 10 mm 내지 20 mm이고,상기 저항체층의 세로 길이는 10 mm 내지 20 mm인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제12항에 있어서,상기 제2 중간층의 가로 길이는 10 mm 내지 20 mm이고,상기 제2 중간층의 세로 길이는 10 mm 내지 20 mm이고,상기 제2 중간층의 두께는 0.4 mm 내지 0.6 mm인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제13항에 있어서,상기 제1 중간층 및 상기 제2 중간층의 유전 상수(dielectric constant)는 3.5이고,상기 제1 중간층 및 상기 제2 중간층의 유전 손실 탄젠트(dielectric loss tangent)는 0.0027인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 제14항에 있어서,상기 제2 금속층의 가로 길이는 10 mm 내지 20 mm이고,상기 제2 금속층의 세로 길이는 10 mm 내지 20 mm이고,상기 제2 금속층의 두께는 30 μm 내지 40 μm인 것을 특징으로 하는,메타물질 흡수체의 단위셀.
- 복수의 단위셀을 포함하고,상기 복수의 단위셀은 동일 평면상에 배열되어 평판 구조를 형성하고,상기 복수의 단위셀 각각은,적어도 하나의 동심 원형 링 형상의 도체패턴을 포함하는 제1 금속층;상기 제1 금속층의 하면에 배치되고 폴리이미드로 구성되는 제1 중간층;상기 제1 중간층의 하면에 배치되는 저항체층;상기 저항체층의 하면에 배치되고 폴리이미드로 구성되는 제2 중간층; 및상기 제2 중간층의 하면에 배치되는 제2 금속층을 포함하고,상기 저항체층은 동작주파수의 동작 대역폭을 증가시키고,상기 저항체층의 두께는 0.05 mm 내지 0.15 mm이고,상기 저항체층의 면저항은 530 Ω·sq-1 내지 550 Ω·sq-1인 것을 특징으로 하는,메타물질 흡수체.
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KR20130040041A (ko) * | 2011-10-13 | 2013-04-23 | 한양대학교 산학협력단 | 음의 투자율 가지는 메타 원자 및 이를 포함한 메타 물질 |
KR101437279B1 (ko) * | 2013-04-24 | 2014-09-05 | 한양대학교 산학협력단 | 광대역 전자파 흡수체 |
KR101617728B1 (ko) * | 2015-06-12 | 2016-05-03 | 한양대학교 산학협력단 | 광대역 전자기파 흡수체의 단위셀 |
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CN111367000A (zh) * | 2020-04-13 | 2020-07-03 | 中国科学院光电技术研究所 | 一种同时实现激光低反射、红外低辐射与微波高吸收的层状结构 |
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KR20130040041A (ko) * | 2011-10-13 | 2013-04-23 | 한양대학교 산학협력단 | 음의 투자율 가지는 메타 원자 및 이를 포함한 메타 물질 |
KR101437279B1 (ko) * | 2013-04-24 | 2014-09-05 | 한양대학교 산학협력단 | 광대역 전자파 흡수체 |
KR101617728B1 (ko) * | 2015-06-12 | 2016-05-03 | 한양대학교 산학협력단 | 광대역 전자기파 흡수체의 단위셀 |
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CN111367000A (zh) * | 2020-04-13 | 2020-07-03 | 中国科学院光电技术研究所 | 一种同时实现激光低反射、红外低辐射与微波高吸收的层状结构 |
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