Electromagnetic wave transmission film and window structure

Abstract

The utility model provides an electromagnetic wave transmission film and a window structure body. The electromagnetic wave transmission film provided by the embodiment of the utility model comprises a substrate; a conductive pattern disposed on the substrate and including an electrode region and a hollow region; and a dummy pattern disposed in the hollow region on the substrate at a distance from the electrode region. The aperture ratio of the dummy pattern may be 50% or less. The window structure body provided by the embodiment of the utility model comprises the electromagnetic wave transmission film provided by the embodiment of the utility model.

Description

TECHNICAL FIELD

[0001] The present utility model relates to an electromagnetic wave transmission film and a window structure. BACKGROUND

[0002] Recently, with the development of information society, wireless communication technologies such as Wi-Fi and Bluetooth are being applied or built into image display devices, electronic devices, buildings, Internet of Things (IoT), and self-driving vehicles. In addition, with the evolution of mobile communication technologies, for example, antennas for performing high frequency or ultra-high frequency band communication are widely used in windows, home appliances, vehicle windows, building outer walls, etc. For example, together with Wi-Fi operating in a frequency band of 2.4 GHz, 5 GHz, etc., and Bluetooth operating in a frequency band of 2.45 GHz, a 5G (5th-generation) communication system operating in a high frequency band (e.g., 28 GHz or higher) is being commonly used.

[0003] However, before the electromagnetic wave emitted from the transmitting part reaches the receiver, transmission loss can occur due to the presence of atmosphere or obstacles (e.g., walls or car glass) in the transmission path.

[0004] High frequency or ultra-high frequency band electromagnetic waves have a fast transmission speed, a short wavelength, are not easily diffracted, and the transmission distance can also be relatively short. For example, electromagnetic waves emitted from a base station antenna can be lost, attenuated, or dissipated when passing through a wall or a window before reaching the receiving part. Therefore, signal efficiency and coverage can be reduced, and energy usage can be increased to compensate for signal loss.

[0005] It can be necessary to design additional components for suppressing loss of electromagnetic waves radiated from an antenna or a radar and ensuring reliability. For example, Korean Patent Publication No. 10-2011-0037262 discloses a surface wave suppression device. SUMMARY

[0006] An object of the present utility model is to provide an electromagnetic wave transmission film having improved radio wave transmission rate in a specific frequency band.

[0007] An object of the present utility model is to provide a window structure having improved radio wave transmission rate in a specific frequency band.

[0008] The technical solution of the present utility model for solving the above-mentioned object is as follows.

[0009] The electromagnetic wave transmission film includes: a substrate; a conductive pattern disposed on the substrate and including an electrode region and a hollow region; and a dummy pattern disposed in the hollow region on the substrate with a spacing from the electrode region and having an aperture ratio of 50% or less.

[0010] The dummy pattern includes a plurality of sub-patterns arranged periodically.

[0011] The sub-patterns have an island pattern shape physically spaced from each other.

[0012] Each of the sub-patterns has a circular or polygonal shape.

[0013] The ratio of the width of the sub-pattern to the width of the conductive pattern is 0.1 or less.

[0014] The width of the sub-pattern is greater than the spacing distance between adjacent sub-patterns.

[0015] The dummy pattern has an aperture ratio of 10% or more.

[0016] The conductive pattern has a ring shape or a loop shape.

[0017] The conductive pattern includes a first pattern and a second pattern physically spaced from each other, and the hollow region is defined by the region between the first pattern and the second pattern.

[0018] The first pattern surrounds the edge of the second pattern in the planar direction with the second pattern as the center.

[0019] The first pattern has a circular or polygonal ring shape in the planar direction.

[0020] The second pattern has an island pattern shape of a circle or a polygon.

[0021] When viewed from the planar direction, the area of the electrode region is greater than the area of the dummy pattern.

[0022] The electrode region and the dummy pattern of the conductive pattern have a solid structure.

[0023] A unit cell is defined by the conductive pattern and the dummy pattern, and a plurality of unit cells are arranged adjacent to each other and repeatedly on the substrate.

[0024] The conductive pattern and the dummy pattern include a transparent conductive oxide.

[0025] Further, the utility model also provides a window structure body, including the electromagnetic wave permeable membrane according to above 1.

[0026] Wherein, the window structure body further includes a lower substrate arranged below the substrate, and an air layer formed between the substrate and the lower substrate.

[0027] The utility model has the following effects.

[0028] The conductive pattern of the embodiment of the utility model can include an electrode region and a hollow region. The conductive pattern can selectively transmit, amplify or reflect electromagnetic waves of a specific frequency band. Therefore, the reflection, attenuation and phase change of electromagnetic waves are suppressed in the desired frequency band, and the transmittance of electromagnetic waves can be increased.

[0029] A dummy pattern with a predetermined opening rate can be formed in the hollow region of the conductive pattern. The heat flow and transfer through the hollow region can be blocked, and the thermal resistance and heat insulation performance of the electromagnetic wave permeable membrane can be improved. The dummy pattern includes a plurality of sub-patterns arranged periodically, and can simultaneously improve the optical and electromagnetic wave transmission properties. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic plan view showing the electromagnetic wave permeable membrane of an exemplary embodiment.

[0031] Figure 2 is a schematic plan view showing the A region of Figure 1 .

[0032] Figure 3 is a schematic plan view showing the conductive pattern of an exemplary embodiment.

[0033] Figure 4 is a schematic plan view showing the electromagnetic wave permeable membrane of an exemplary embodiment.

[0034] Figure 5 is a schematic sectional view showing the electromagnetic wave permeable membrane of an exemplary embodiment.

[0035] Figure 6 and Figure 7 are schematic sectional views showing the window structure body of an exemplary embodiment, respectively.

[0036] Figure 8 is a graph showing the electromagnetic wave transmission loss of the window structure body of the embodiment, comparative example 1, comparative example 2 and comparative example 4. DETAILED DESCRIPTION

[0037] The embodiment of the utility model provides a conductive pattern and an electromagnetic wave permeable membrane comprising the conductive pattern.

[0038] Embodiments of the present application will be described more specifically below with reference to the accompanying drawings. However, the drawings attached to the present specification illustrate preferred embodiments of the present application, and together with the foregoing description of the application serve to further understand the technical idea of the present application, and therefore the present application should not be construed only by the matters described in such drawings.

[0039] The terms "upper", "lower", "first", "second", and the like used in the present application indicate the relative positions of the components, and do not mean absolute up-down relationships.

[0040] Figure 1 is a schematic plan view of an electromagnetic wave transmission film showing an exemplary embodiment.

[0041] Referring to Figure 1 , the electromagnetic wave transmission film can include a conductive pattern 10 and a dummy pattern 20.

[0042] The conductive pattern 10 can include an electrode region 12 and a hollow region 11. The hollow region 11 can refer to a hollow region such as a slot, a slit, a hole, or a cavity formed within the conductive pattern 10 when viewed in a planar direction.

[0043] The conductive pattern 10 can pass electromagnetic waves of a prescribed frequency band among incident electromagnetic waves while absorbing or reflecting electromagnetic waves of the prescribed frequency band. For example, the conductive pattern 10 can selectively transmit, amplify, or shield electromagnetic waves of a specific frequency band among electromagnetic waves incident onto a surface of the electromagnetic wave transmission film.

[0044] For example, electromagnetic waves of a high frequency or an ultra-high frequency band such as 4G / 5G have a short wavelength and are difficult to diffract, and thus reflection and interference of electromagnetic waves can increase. Accordingly, the loss and attenuation of electromagnetic waves can increase when passing through a structure such as a wall or glass, thereby reducing signal efficiency and coverage.

[0045] The conductive pattern 10 can selectively transmit or reflect electromagnetic waves of a specific frequency band by adjusting the phase, direction, and refractive index of the incident electromagnetic waves. Accordingly, it is possible to prevent transmission loss and reduction even in a high frequency band, and to increase signal strength and reduce electromagnetic wave noise in a desired frequency band.

[0046] The dummy pattern 20 can be disposed within the hollow region 11 of the conductive pattern 10. The dummy pattern 20 can be electrically separated and physically separated from the electrode region 12. Through the dummy pattern 20, the thermal conductivity of the electromagnetic wave transmission film is reduced, and the heat insulation property is improved.

[0047] For example, the hollow region 11 can be formed within the conductive pattern 10 to increase an open ratio of the electromagnetic wave transmission film. As the open ratio increases, heat transfer through the hollow region 11 can increase, and thermal resistance of the electromagnetic wave transmission film can decrease. In this case, the heat insulation property of the electromagnetic wave transmission film can decrease.

[0048] According to an exemplary embodiment, the dummy pattern 20 blocks or hinders heat transfer and radiation through the hollow region 11, thereby reducing thermal energy passing through the electromagnetic wave transmission film. Accordingly, the conductive pattern can have a higher thermal resistance and a lower thermal conductivity, and the heat insulation property of the electromagnetic wave transmission film can be improved.

[0049] The open ratio of the dummy pattern 20 can be 50% or less. The open ratio can be calculated as a percentage of a total area of the dummy pattern 20 with respect to a total area of the hollow region 11 when viewed in a planar direction.

[0050] When the open ratio of the dummy pattern 20 is 50% or less, thermal energy passing through the conductive pattern 10 can be reduced, and the electromagnetic wave transmission film can have a higher reflection characteristic with respect to radiation lines in an infrared or far infrared region. Accordingly, it is possible to improve the heat insulation property while improving the transmittance of electromagnetic waves.

[0051] In some embodiments, the open ratio of the dummy pattern 20 can be 40% or less, preferably 30% or less, and more preferably 20% or less. Within the above range, the electromagnetic wave transmission film has a higher selective electromagnetic wave transmission characteristic, and it is possible to further improve the heat insulation property.

[0052] In some embodiments, the open ratio of the dummy pattern 20 can be 5% or more, and preferably 10% or more. Accordingly, it is possible to improve the transmittance of selective electromagnetic waves while blocking heat conduction and radiation.

[0053] Figure 2 is a schematic plan view of an A region of Figure 1 amplified.

[0054] Referring to Figure 2 , the dummy pattern 20 can be physically separated from the electrode region 12 of the conductive pattern 10 by the separation region 18. The dummy pattern 20 can include a plurality of sub-patterns 22.

[0055] The sub-patterns 22 can be physically spaced apart from each other. For example, the sub-patterns 22 can have an island pattern shape. Changes in capacitance or inductance due to electrical connection between the sub-patterns 22 can be prevented.

[0056] The sub-patterns 22 can be arranged periodically and repeatedly within the hollow regions 11. The sub-patterns 22 are arranged periodically at the periphery of the electrode regions 12 of the conductive pattern 10, so that the reflectance and refractive index of the electromagnetic wave-transmitting film can be homogenized or flattened. Thus, visual recognition due to optical deviation can be suppressed. Further, the opening ratio of the hollow regions 11 is reduced by the sub-patterns 22, so that the heat shielding property of the electromagnetic wave-transmitting film can be improved.

[0057] According to an exemplary embodiment, the sub-patterns 22 can have a circular shape, or a polygonal shape such as a quadrangular shape, a pentagonal shape, a hexagonal shape, or the like. For example, the sub-patterns 22 can be solid patterns having a circular shape or a polygonal shape.

[0058] In some embodiments, the period P of the sub-patterns 22 can be 100 μm or less. The period P of the sub-patterns 22 can be the shortest distance between the centers of adjacent sub-patterns 22. Accordingly, coupling between the sub-patterns 22 can be suppressed, and occurrence of electromagnetic wave transmission loss and noise can be suppressed. Thus, the selective transmission property of electromagnetic waves in a desired frequency band can be improved.

[0059] In an embodiment, the period P of the sub-patterns 22 can be 200 μm or less, 150 μm or less, 100 μm or less, and preferably 50 μm or less. In an embodiment, the period P of the sub-patterns 22 can be 8 μm or more, 10 μm or more, or 12 μm or more. Within the above ranges, the electromagnetic wave transmission rate and the heat shielding property of the electromagnetic wave-transmitting film can be improved together.

[0060] In some embodiments, the ratio of the width W2 of the sub-patterns 22 to the width Wl of the conductive pattern 10 can be 0.1 or less. Within the above range, interference and distortion of the electrical property of the conductive pattern 10 by the virtual pattern 20 can be prevented. Thus, the selective transmission property of electromagnetic waves in a desired frequency band can be improved while the heat shielding property is improved.

[0061] In an embodiment, the ratio of the width W2 of the sub-patterns 22 to the width Wl of the conductive pattern 10 can be 0.09 or less, 0.08 or less, or 0.05 or less. In an embodiment, the ratio of the width W2 of the sub-patterns 22 to the width Wl of the conductive pattern 10 can be 0.001 or more, 0.005 or more, or 0.01 or more.

[0062] The width of the conductive pattern 10 and the width of the sub-patterns 22 can be adjusted according to the frequency wavelength of a desired frequency band. For example, the width of the conductive pattern 10 can be adjusted to satisfy Equation 1.

[0063] [Equation 1]

[0064] λ / 20 ≤ Wl ≤ λ / 2

[0065] In Formula 1, W1 is the width of the conductive pattern 10, and λ can be the wavelength of an electromagnetic wave having a transmission target frequency band.

[0066] In an embodiment, the interval distance G2 between the sub-patterns 22 adjacent to each other can be smaller than the width W2 of the sub-patterns 22. Thus, the heat insulation property of the electromagnetic wave transmission film can be improved while improving the visual recognition of the conductive pattern 10 and the dummy pattern 20.

[0067] In some embodiments, the interval distance G2 between the sub-patterns 22 can be 1 μm to 10 μm. Within the above range, the heat insulation property can be further improved while improving the electromagnetic wave transmission rate and the optical property. In an embodiment, the interval distance G2 between the sub-patterns 22 can be 1 μm to 8 μm, or 2 μm to 6 μm.

[0068] In an embodiment, the interval distance G1 between the electrode region 12 of the conductive pattern 10 and the dummy pattern 20 can be about 1 μm to 10 μm, or about 3 μm to 10 μm. Within the above range, the insulation property between the dummy pattern 20 and the conductive pattern 10 can be ensured while suppressing the visual recognition of the conductive pattern 10.

[0069] In some embodiments, the sub-patterns 22 can be arranged in a row direction and a column direction. For example, a plurality of sub-patterns 22 can be arranged in the row direction to define a sub-pattern row, and a plurality of sub-patterns 22 can be arranged in the column direction to define a sub-pattern column.

[0070] In an embodiment, a plurality of the sub-pattern rows can be arranged in the column direction. In an embodiment, a plurality of the sub-pattern columns can be arranged in the row direction.

[0071] The interval regions between the sub-patterns 22 can have a grid shape. For example, the interval lines extending in the row direction and the interval lines extending in the column direction can be formed by the sub-pattern rows and the sub-pattern columns.

[0072] In an embodiment, the hollow region 11 of the conductive pattern 10 can have a straight line shape, a circular shape, a polygonal shape (e.g., a quadrilateral, a pentagon, a hexagon, an octagon, etc.), a ring shape, or a cross shape. The user can appropriately adjust the shape of the hollow region 11 according to various purposes and target effects. For example, the electromagnetic property of the conductive pattern 10 can be adjusted according to the shape, area, and size of the hollow region 11, etc.

[0073] In some embodiments, the conductive pattern 10 can have a ring shape or a closed-loop shape. The hollow region can be formed at the center of the ring shape or the closed-loop shape.

[0074] Figure 3is a schematic plan view showing an exemplary embodiment of the conductive pattern 10. For ease of explanation, Figure 3 In the middle, the illustration of the dummy pattern 20 is omitted.

[0075] Referring to Figure 3 The conductive pattern 10 can include a first pattern 14 and a second pattern 16 physically spaced apart from each other. A hollow region 11 can be defined as a region between the first pattern 14 and the second pattern 16.

[0076] In an embodiment, the first pattern 14 can be formed at an edge periphery of the second pattern 16 with the second pattern 16 as a center. For example, the first pattern 14 can have a shape surrounding the second pattern 16.

[0077] The transmission and reflection characteristics of electromagnetic waves incident toward the conductive pattern 10 can be adjusted by the first pattern 14 and the second pattern 16. Accordingly, the transmittance of electromagnetic waves of a desired frequency band can be improved, or the electromagnetic waves of the frequency band can be eliminated or attenuated by the conductive pattern 10.

[0078] In some embodiments, the first pattern 14 can have a ring shape or a closed loop shape. The outer contour edge of the first pattern 14 can have a circular shape or a polygonal shape such as a quadrilateral shape, a hexagonal shape, etc. For example, the first pattern 14 can include an edge pattern having a ring shape of a circular shape or a polygonal shape.

[0079] In an embodiment, the conductive pattern 10 can include a corner pattern 15 protruding from the first pattern 14 toward a center of the first pattern 14. The corner pattern 15 can be integrally connected with the first pattern 14.

[0080] When viewed from a planar direction, the second pattern 16 can be disposed inside the first pattern 14. For example, the second pattern 16 can have an independent island pattern shape disposed at a center of the ring shape.

[0081] The second pattern 16 is disposed inside the first pattern 14, so that the aperture ratio of the conductive pattern 10 can be reduced as a whole. Accordingly, the conductive pattern 10 can have a lower thermal conductivity and a higher thermal resistance.

[0082] In some embodiments, the second pattern 16 can have a circular shape or a polygonal shape. In an embodiment, the shape of the second pattern 16 can be adjusted according to the frequency of electromagnetic waves to be transmitted or shielded.

[0083] In an embodiment, the outer contour edge of the first pattern 14 and the outer contour edge of the second pattern 16 can have the same shape or appearance. For example, when the outer contour edge of the first pattern 14 has a square shape, the outer contour edge of the second pattern 16 can also have a square shape.

[0084] In an embodiment, a hollow region can also be formed inside the second pattern 16. For example, the second pattern 16 can also have a circular or polygonal ring shape, and a slit can be formed inside the second pattern 16.

[0085] In some embodiments, the area of the electrode region 12 of the conductive pattern 10 can be greater than the area of the dummy pattern 20 when viewed in a planar direction. Accordingly, the thermal resistance and the electromagnetic wave transmittance of the electromagnetic wave transmissive film can be simultaneously improved.

[0086] In an embodiment, the area of the electrode region 12 can be greater than the area of the hollow region 11 when viewed in a planar direction. The area of the hollow region 11 can be 50% or less of the total area of the conductive pattern 10, for example, 5% to 50%, 5% to 40%, or 10% to 30%.

[0087] In some embodiments, the electrode region 12 of the conductive pattern 10 and the dummy pattern 20 can include a solid structure. Accordingly, the total opening rate of the electromagnetic wave transmissive film can be reduced, thereby the thermal conductivity and the thermal conductivity can be reduced, and the heat insulation property can be improved.

[0088] According to an exemplary embodiment, the conductive pattern 10 and / or the dummy pattern 20 can include a metal, an alloy, a metal oxide, or a transparent conductive oxide.

[0089] For example, the conductive pattern 10 and / or the dummy pattern 20 can include silver (Ag), gold (Au), copper (Cu), aluminum (Al), platinum (Pt), palladium (Pd), chromium (Cr), titanium (Ti), tungsten (W), niobium (Nb), tantalum (Ta), vanadium (V), iron (Fe), manganese (Mn), cobalt (Co), nickel (Ni), zinc (Zn), tin (Sn), molybdenum (Mo), calcium (Ca), or an alloy containing at least one of these. These can be used alone or in combination of two or more.

[0090] In an embodiment, the conductive pattern 10 can include silver (Ag) or a silver alloy (for example, a silver-palladium-copper (APC) alloy), or copper (Cu) or a copper alloy (for example, a copper-calcium (CuCa) alloy).

[0091] In some embodiments, the conductive pattern 10 and the dummy pattern 20 can include a transparent conductive oxide. Accordingly, for example, even if the conductive pattern 10 and the dummy pattern 20 have a solid structure, the electromagnetic wave transmittance loss and the optical properties can be improved. Thus, the visual recognition, the electromagnetic wave transmittance, and the heat insulation property of the electromagnetic wave transmissive film can be further improved.

[0092] The transparent conductive oxide can include indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), aluminum zinc oxide (AZO), zinc oxide (ZnOx), indium oxide (InOx), tin oxide (SnOx), cadmium tin oxide (CTO), gallium-doped zinc oxide (GZO), zinc tin oxide (ZTO), indium gallium oxide (IGO), etc.

[0093] In some embodiments, the conductive pattern 10 and / or the dummy pattern 20 can include a stacked structure of a transparent conductive oxide layer and a metal layer, for example, a two-layer structure of a transparent conductive oxide layer-metal layer, or a three-layer structure of a transparent conductive oxide layer-metal layer-transparent conductive oxide layer.

[0094] In an embodiment, the conductive pattern 10 and / or the dummy pattern 20 can include a meta-material. The electromagnetic wave transmittance, the refractive index, the incident angle, and the frequency band can be adjusted by the meta-material.

[0095] Figure 4 FIG. 1 is a schematic plan view showing an electromagnetic wave transmittable film according to an exemplary embodiment.

[0096] Referring to Figure 4 A unit cell C can be defined by the conductive pattern 10 and the dummy pattern 20. A plurality of the unit cells C can be arranged adjacent to each other in repetition.

[0097] By periodically arranging the unit cells C, the selective transmittance characteristics of the electromagnetic wave of a specific frequency band can be improved. For example, by the conductive pattern 10 arranged in a predetermined period, an inductive capacitance or inductance, the electromagnetic wave transmittable film can resonate at a frequency having a specific impedance. Accordingly, the frequency selectivity of the electromagnetic wave transmittable film can be further increased.

[0098] In an embodiment, the unit cells C adjacent to each other can be in contact with each other. For example, the unit cells C can be integrally formed. In an embodiment, the unit cells C can be arranged spaced apart from each other physically.

[0099] The electromagnetic characteristics of the electromagnetic wave transmittable film can be adjusted by the arrangement pattern of the unit cells C. For example, the shape, the arrangement period, and the interval of the unit cells C can be designed or adjusted in consideration of the transmittance of the object frequency band, the direction of the electromagnetic wave, or the transmittance, reflectance, etc. of infrared rays, ultraviolet rays, visible rays, etc.

[0100] The electromagnetic wave transmittable film can further include a substrate 30. The conductive pattern 10 and the dummy pattern 20 can be formed on the substrate 30.

[0101] The substrate 30 can include, for example, a transparent resin material. For example, the substrate 30 can include a polyester-based resin such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, polybutylene terephthalate, or the like; a cellulose-based resin such as diacetyl cellulose, triacetyl cellulose, or the like; a polycarbonate-based resin; an acrylic-based resin such as polymethyl acrylate, polyethyl acrylate, or the like; a styrene-based resin such as polystyrene, acrylonitrile-styrene copolymer, or the like; a polyolefin-based resin such as polyethylene, polypropylene, a polyolefin having a ring structure or a norbornene structure, ethylene-propylene copolymer, or the like; a vinyl chloride-based resin; an amide-based resin such as nylon, aromatic polyamide, or the like; an imide-based resin; a polyether sulfone-based resin; a sulfone-based resin; a polyether ether ketone-based resin; a polyphenylene sulfide-based resin; a vinyl alcohol-based resin; a vinylidene chloride-based resin; a vinyl butyral-based resin; an allyl-based resin; a polyformal-based resin; an epoxy-based resin; a polyurethane-based or acrylic polyurethane-based resin; a silicon-based resin; or the like. These can be used alone or in combination of two or more.

[0102] In an embodiment, an adhesive film such as an optically clear adhesive (OCA), an optically clear resin (OCR), or the like can be included in the substrate 30.

[0103] In some embodiments, the substrate 30 can include an inorganic insulating material such as silicon oxide, silicon nitride, silicon oxynitride, or the like.

[0104] According to an embodiment, an object to which the electromagnetic wave-transmitting film is attached can be provided as the substrate 30. For example, a glass substrate such as an exterior wall of a building, a window, a household appliance, or a car window can be provided as the substrate 30 of the electromagnetic wave-transmitting film.

[0105] In some embodiments, the dielectric constant of the substrate 30 can be adjusted to a range of about 2 to 12.

[0106] In some embodiments, the first pattern 14 and the second pattern 16 can be configured on the same level or the same layer on the substrate 30. In some embodiments, the conductive pattern 10 and the virtual pattern 20 can also be configured on the same level or the same layer on the substrate 30.

[0107] The electromagnetic wave-transmitting film can be provided as an electromagnetic wave-transmitting device, an electromagnetic wave-amplifying device, a resonator, a filter, a frequency selective surface (FSS), a reconfigurable intelligent surface (RIS), or the like.

[0108] In some embodiments, the electromagnetic wave permeable film can be applied to wireless communication systems, image display devices, electronic devices, buildings, aircraft, vehicles, etc. For example, the electromagnetic wave permeable film can be attached to windows, home appliances, vehicle windows, building exterior walls, etc., and selectively absorb electromagnetic waves to block heat flow from the inside and outside.

[0109] Figure 5 FIG. 1 is a schematic cross-sectional view of an electromagnetic wave permeable film illustrating an exemplary embodiment.

[0110] Referring to Figure 5 The electromagnetic wave permeable film can include a substrate 90 and an electrode pattern layer 100 disposed on the substrate 90.

[0111] The electrode pattern layer 100 can include an electrode layer 130 including the conductive pattern and the dummy pattern described above.

[0112] The electrode layer 130 can include the metal, alloy, metal oxide, or transparent conductive oxide described above. In an embodiment, the electrode layer 130 can include a solid structure.

[0113] In an embodiment, the electrode pattern layer 100 can further include a lower insulating layer 120 disposed between the substrate 90 and the electrode layer 130 and / or an upper insulating layer 140 disposed on the electrode layer 130.

[0114] The lower insulating layer 120 can improve mechanical properties such as crack resistance and stability of the electrode pattern layer 100. The upper insulating layer 140 can prevent oxidation and corrosion of the metal or metal oxide included in the electrode pattern layer 100.

[0115] In an embodiment, the lower insulating layer 120 and the upper insulating layer 140 can include an organic insulating material such as an epoxy resin, an acrylic resin, an imide-based resin, etc., or an inorganic insulating material such as silicon oxide, silicon nitride, silicon oxynitride, etc.

[0116] In an embodiment, a transparent film can be provided as the lower insulating layer 120 and the upper insulating layer 140. For example, the transparent film can include the transparent resin material described above.

[0117] In some embodiments, the dielectric constant of the lower insulating layer 120 and the upper insulating layer 140 can be adjusted to a range of about 2 to 12, respectively. When the dielectric constant described above exceeds about 12, reflection, refraction, and phase change of electromagnetic waves can increase, thereby reducing electromagnetic wave permeability.

[0118] According to an exemplary embodiment, the electrode pattern layer 100 can further include an adhesive layer 150. The electrode pattern layer 100 can be attached to the substrate 90 through the adhesive layer 150. In some embodiments, the adhesive layer 150 can include an adhesive film such as an optical clear adhesive (OCA), an optical clear resin (OCR).

[0119] The window structure of the embodiment of the present application can include the conductive pattern or the electromagnetic wave transmission film described above.

[0120] Figure 6 and Figure 7 are schematic cross-sectional views respectively illustrating the window structure of an exemplary embodiment.

[0121] Referring to Figure 6 and Figure 7 , the window structure can include a substrate 90, and an electrode pattern layer 100 disposed on the substrate 90.

[0122] The position and size of the area in which the electrode pattern layer 100 is formed can be designed or adjusted in consideration of the surrounding environment or driving conditions of the antenna. For example, the indoor and outdoor temperatures, humidity, thickness and dielectric constant of the substrate, surrounding structures, dielectric constant and physical properties of the structures, height of the window structure and signal transmission path, frequency, incident angle and transmission distance of electromagnetic waves, etc. can be considered.

[0123] Through the electrode pattern layer 100, the electromagnetic wave transmission rate of a specific frequency band among electromagnetic waves incident to the window structure can be increased. In addition, the electrode pattern layer 100 blocks thermal energy such as thermal radiation passing through the window structure, and thus can improve thermal insulation.

[0124] In some embodiments, the window structure can further include a lower substrate 92. For example, the window structure can have a pair glass form.

[0125] In an embodiment, an air layer 200 can be formed between the substrate 90 and the lower substrate 92. The air layer 200 can include air or argon (Ar) gas. Heat flow through conduction and convection can be further suppressed by the air layer 200.

[0126] The electrode pattern layer 100 can be formed on the substrate 90 or the lower substrate 92. In an embodiment, the electrode pattern layer 100 can be formed on both the substrate 90 and the lower substrate 92.

[0127] Referring to Figure 6The electrode pattern layer 100 can be formed on the opposite face of the face of the air layer 200 facing the substrate 90. For example, the electrode pattern layer 100 can be formed on the face of the substrate 90 on which electromagnetic waves are incident.

[0128] Referring to Figure 7 The electrode pattern layer 100 can be formed on the face of the air layer facing the substrate. For example, the electrode pattern layer 100 can be formed on the opposite face of the face of the substrate 90 on which electromagnetic waves are incident.

[0129] The window structure can be applied to various structures such as windows of public transportation such as buses, subways, and the like, buildings, windows, vehicles, decorative shapes, guide signs (for example, direction signs, emergency exit signs, emergency lights), and the like. Through the window structure, the signal efficiency of an antenna or a radar can be increased while improving thermal insulation and energy efficiency.

[0130] The preferred embodiments are presented below to help understand the present application, but these embodiments are only illustrative of the present application and do not limit the scope of the appended claims. It will be obvious to those skilled in the art that various changes and modifications can be made to the embodiments within the scope and technical thought of the present application, and such changes and modifications naturally fall within the scope of the appended patent claims.

[0131] Experimental Example

[0132] Example

[0133] As a window structure, a glass substrate to which an electromagnetic wave-transmitting film is attached was used. Specifically, as shown in FIG. 1, an electrode pattern layer including a conductive pattern and a dummy pattern was formed on a glass substrate (thickness 4.8 t). The electrode pattern layer was formed in a three-layer structure of a lower insulating layer-electrode layer (IZO / APC / IZO)-upper insulating layer. The electrode pattern layer was adhered to the glass substrate by OCA (thickness 5 μm). Figure 1 The dummy pattern was formed in a form as shown in FIG. 2. The period P of the sub-pattern was set to 13.9 μm, the width W2 of the sub-pattern was set to 9.4 μm, and the interval distance G2 between the sub-patterns was set to 4.5 μm. The opening ratio of the dummy pattern was 10%.

[0134] Figure 2

[0135] Comparative Example 1 As a window structure, a glass substrate having a thickness of 4.8 t was used.

[0136]

[0137] Comparative Example 2 ​​

[0138] As the window structure, Low-E glass (Low-emissivity glass) was used. For the Low-E glass, a metal thin film of NiCr / Ag / NiCr was formed on a glass substrate having a thickness of 4.8 t. The metal thin film was formed to have a solid structure.

[0139] Comparative Example 3

[0140] The window structure was manufactured in the same manner as in the example except that the dummy pattern was not formed.

[0141] Comparative Example 4

[0142] The window structure was manufactured in the same manner as in the example except that the opening ratio of the dummy pattern was adjusted to 70%. Specifically, the dummy pattern was formed in a mesh structure defined by wires crossing each other, the period of the wires was set to 50 pm, the width was set to 10 pm, and the pitch between the wires was set to 10 pm.

[0143] Visual recognition evaluation

[0144] The visual recognition of the conductive pattern and the dummy pattern was evaluated by visually observing the window structure.

[0145] <Assessment Criteria>

[0146] : The pattern cannot be visually recognized from all directions.

[0147] : The pattern can be visually recognized in a specific direction.

[0148] : The pattern can be clearly visually recognized

[0149] Electric wave transmission loss evaluation

[0150] The amount of wave transmission with respect to the window structure was evaluated. The wave transmission loss was measured as a relative value with respect to the amount of transmission in air in a frequency domain of 27 to 29 GHz.

[0151] <Assessment Criteria>

[0152] : The wave transmission loss is -5 dB or more

[0153] : The wave transmission loss is less than -5 dB and is -30 dB or more

[0154] : The wave transmission loss is less than -30 dB

[0155] Figure 8 is a graph showing the electromagnetic wave transmission loss of the window structures of the example, Comparative Example 1, Comparative Example 2, and Comparative Example 4.

[0156] Thermal insulation evaluation

[0157] The thermal emissivity of the window structure was measured by an infrared spectrometer (FT-IR) according to Korean Standard KS L 2514. Using the measured emissivity, the thermal conductivity of the window structure was measured according to Korean Standard KS L 2003:2013.

[0158] <Assessment Criteria>

[0159] ◎: Thermal emissivity less than 0.1, thermal conductivity less than 3.5 W / m 2 K

[0160] O: Thermal emissivity 0.1 to 0.3, thermal conductivity 3.5 W / m 2 K to 4.5 W / m 2 K

[0161] Δ: Thermal emissivity more than 0.3 and less than 0.8, thermal conductivity more than 4.5 W / m 2 K and less than 5.5 W / m 2 K

[0162] X: Thermal emissivity 0.8 or more, thermal conductivity 5.5 W / m 2 K or more

[0163] The assessment results are shown in Table 1 below.

[0164] [Table 1]

[0165] Visual recognition Electric wave transmission rate Thermal insulation Example ◎ ◎ ○ Comparative Example 1 ◎ ○ × Comparative Example 2 ◎ × ◎ Comparative Example 3 △ ◎ △ Comparative Example 4 △ ◎ △

[0166] Referring to Table 1 and Figure 8 In the window structure of the embodiment, the electromagnetic wave transmittance is higher in the ultra-high frequency band, and the thermal emissivity and the thermal conductivity are lower.

[0167] However, in the case of the comparative examples, the wave transmittance, the visual recognition, or the thermal insulation of the window structure is reduced.

[0168] In Comparative Example 1, the glass substrate window structure is used so that the thermal insulation is reduced, and the wave transmittance loss is relatively high. In Comparative Example 2, the Low-E glass is used as the glass window structure, showing a higher wave transmittance loss of less than -30 dB.

[0169] In Comparative Examples 3 and 4, the visual recognition of the pattern is reduced, and the window structure has a higher thermal emissivity and thermal conductivity.

Claims

1. An electromagnetic wave-transmitting film, characterized by comprising: Comprise: a substrate; a conductive pattern configured on the substrate and including an electrode region and a hollow region; and a dummy pattern configured in the hollow region on the substrate with a spacing from the electrode region and having an aperture ratio of 50% or less.

2. The electromagnetic wave-transmitting film according to claim 1, wherein the dummy pattern includes a plurality of sub-patterns arranged periodically.

3. The electromagnetic wave-transmitting film according to claim 2, wherein the sub-patterns have an island-shaped pattern shape spaced apart from each other physically.

4. The electromagnetic wave-transmitting film according to claim 2, wherein each of the sub-patterns has a circular or polygonal shape.

5. The electromagnetic wave-transmitting film according to claim 2, wherein a ratio of a width of the sub-pattern to a width of the conductive pattern is 0.1 or less.

6. The electromagnetic wave-transmitting film according to claim 2, wherein a width of the sub-pattern is greater than a spacing distance between adjacent sub-patterns.

7. The electromagnetic wave-transmitting film according to claim 1, wherein the dummy pattern has an aperture ratio of 10% or more.

8. The electromagnetic wave-transmitting film according to claim 1, wherein the conductive pattern includes a ring shape or a loop shape.

9. The electromagnetic wave-transmitting film according to claim 1, wherein the conductive pattern includes a first pattern and a second pattern spaced apart from each other physically, and the hollow region is defined by a region between the first pattern and the second pattern.

10. The electromagnetic wave-transmitting film according to claim 9, wherein the first pattern surrounds an edge of the second pattern in a planar direction with the second pattern as a center.

11. The electromagnetic wave-transmitting film according to claim 10, wherein the first pattern has a circular or polygonal ring shape in the planar direction.

12. The electromagnetic wave-transmitting film according to claim 10, wherein the second pattern has an island-shaped pattern shape of a circular or polygonal shape.

13. The electromagnetic wave-transmitting film according to claim 1, wherein an area of the electrode region is greater than an area of the dummy pattern when viewed in a planar direction.

14. The electromagnetic wave-transmitting film according to claim 1, wherein the electrode region and the dummy pattern of the conductive pattern have a solid structure.

15. The electromagnetic wave-transmitting film according to claim 1, wherein one unit cell is defined by the conductive pattern and the dummy pattern, and a plurality of the unit cells are arranged adjacent to each other and repeatedly on the substrate.

16. The electromagnetic wave-transmitting film according to claim 1, wherein the conductive pattern and the dummy pattern include a transparent conductive oxide.

17. A window structure, comprising the electromagnetic wave-transmitting film according to claim 1.

18. The window structure according to claim 17, further comprising a lower substrate configured below the substrate, and an air layer formed between the substrate and the lower substrate. ​

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