Low-e film with frequency-selective transmission or shielding patterns for electromagnetic waves

Abstract

Various embodiments of the present disclosure relate to a low-E film to which a pattern for frequency-selectively transmitting or blocking electromagnetic waves is applied, the low-E film comprising: an insulating layer composed of an insulating material; and a metal coating layer formed by coating a metal or a metal oxide on one surface of the insulating layer, wherein the metal coating layer includes a plurality of unit cells having a square shape and being repeatedly arranged, each of the plurality of unit cells includes patterns formed by removing a portion of the metal coating layer, and the patterns include a blocking pattern forming a blocking region for blocking electromagnetic waves in a first frequency band and a transmission pattern formed in a transmission region, which is a region of the unit cell excluding the blocking region, for passing electromagnetic waves in a second frequency band.

Description

Low-E film with transmission or blocking patterns based on electromagnetic wave frequency

[0001] Various embodiments of this post relate to low-E films with patterns applied to selectively transmit or block electromagnetic waves.

[0002]

[0003] Low Emissivity Film is a special coating film applied to architectural glass or automobiles, and can improve heating and cooling efficiency in buildings and automobiles through the internal and external thermal insulation effect generated by blocking infrared rays with thin surface-treated silver (Ag) or metal oxides.

[0004] However, when electromagnetic waves are incident on the silver or metal oxide layer of the low-e film, an electric current is induced, causing the incident electromagnetic waves to be reflected when the entire glass is coated with the low-e film. As a result, when the glass parts of buildings, cars, etc., are entirely coated with low-e film, electromagnetic waves cannot enter the interior, causing communication interference.

[0005] Accordingly, conventional technology devised a method to maintain the thermal insulation effect, which is the original purpose of the low-E film, while allowing signals of a specific frequency to pass through by forming a structure with a repeating grid pattern on the low-E film; however, in this case, a large amount of the low-E film was removed, resulting in a relative deterioration of the thermal insulation effect, and it was not possible to block specific frequencies separately.

[0006] Companies and research facilities use 5G specialized networks built with 5G for internal configurations that are accessible only to specific members. In this case, there is a need for technology that allows commercial frequency electromagnetic waves to pass through building glass to enable general communication, while blocking the external leakage of electromagnetic waves from the 5G specialized network to maintain security.

[0007] To solve the above problem, a portion of the Low-E film can be removed to create square loop-shaped slits, and a repeating pattern of unit cells separated by the slits can be formed. In this case, while electromagnetic waves in a specific frequency band can be transmitted, the proportion of the area occupied by the slits within the Low-E film increases, leading to a problem where the heat blocking performance, which is the original function of the Low-E film, deteriorates. Additionally, as many straight-line patterns are formed, there is a problem of light scattering / blurring that reduces user visibility.

[0008] Accordingly, a structure was proposed to prevent light spreading / blurring effects by applying a sine wave pattern to the low-E film to allow specific frequencies to pass through, but in this case, there was a problem in that the transmission performance varied depending on the direction of the incident electromagnetic waves due to the asymmetry of the pattern in the vertical / horizontal direction.

[0009] A pattern structure was proposed in which resonators of size λ0 / 2 were repeatedly arranged to block a specific frequency, where λ0 is the wavelength of the frequency to be blocked. However, this cannot be used for low-E films intended for thermal insulation because the pattern creates a lot of empty space.

[0010]

[0011] Accordingly, the various embodiments of this publication aim to provide a low-E film with a pattern applied that selectively transmits and blocks electromagnetic waves while reducing the slit area by applying a specific electromagnetic wave transmission pattern structure to the low-E film.

[0012] The technical tasks intended to be accomplished in this document are not limited to those mentioned above, and other technical tasks not mentioned will be clearly understood by those skilled in the art to which this post belongs from the description below.

[0013]

[0014] According to one embodiment of the present invention, a low-E film comprises an insulating layer composed of an insulating material and a metal coating layer having a metal or a metal oxide coated on one surface of the insulating layer, wherein the metal coating layer is composed of a plurality of unit cells that are square in shape and repeatedly arranged, and each of the plurality of unit cells includes patterns formed by removing a portion of the metal coating layer, and the patterns may include a blocking pattern forming a blocking region for blocking electromagnetic waves of a first frequency band and a transmission pattern formed in a transmission region, which is a region excluding the blocking region of the unit cell, for passing electromagnetic waves of a second frequency band.

[0015] According to one embodiment of the present invention, the blocking pattern may be in the form of a circular ring formed by two concentric slits having different radii centered on the center of the unit cell.

[0016] According to one embodiment of the present invention, the plurality of unit cells may be arranged isotropically such that the center of a unit cell provided in an odd row on the insulating layer is located on a straight line where adjacent unit cells provided in an even row meet, thereby forming the metal coating layer.

[0017] According to one embodiment of the present invention, the plurality of unit cells may be arranged such that the distance between the centers of the two closest unit cells is less than or equal to half the wavelength of the electromagnetic wave corresponding to the intermediate frequency of the first frequency band.

[0018] According to one embodiment of the present invention, the transmission pattern may be a grid transmission pattern formed by a plurality of straight slits arranged at regular intervals in a first direction and a second direction orthogonal to the first direction while removing the metal coating layer.

[0019] According to one embodiment of the present invention, the transmission pattern may be an equilateral triangle transmission pattern formed by a plurality of first straight slits provided at regular intervals and parallel to one side of the unit cell, a plurality of second straight slits provided at regular intervals and forming an angle of 60 degrees with the first straight slits, and a plurality of third straight slits provided at regular intervals and forming an angle of 120 degrees with the first straight slits and an angle of 60 degrees with the second straight slits.

[0020] According to one embodiment of the present invention, the transmission pattern may be a regular hexagonal transmission pattern formed by a slit that divides the transmission area into a plurality of regular hexagonal regions of the same size.

[0021] According to one embodiment of the present invention, the outer concentric circle among the two concentric circles forming the circular ring-shaped blocking pattern may be characterized in that the diameter is between 0.35 times and 0.5 times the electromagnetic wave wavelength corresponding to the intermediate frequency of the first frequency band.

[0022] According to one embodiment of the present invention, the difference in the radii of the two concentric circles forming the circular ring-shaped blocking pattern may be 0.135 times or less the wavelength of the electromagnetic wave corresponding to the intermediate frequency of the first frequency band.

[0023] According to one embodiment of the present invention, the width of the slit may be 0.2 mm or less.

[0024] According to another embodiment of the present invention, the low-e glass may comprise glass and a low-e film according to any one of the embodiments formed on the glass.

[0025] According to one embodiment of the present invention, a PET layer may be further included between the low-E film and the glass.

[0026]

[0027] According to one embodiment of the present invention, by removing less of the low-E film to reduce the loss of the thermal insulation effect, which is the existing role, it is possible to enable frequency-selective blocking and transmission of specific frequency ranges that were impossible with the entire low-E film structure, thereby preventing communication interference within a building or vehicle while blocking the leakage of specialized network signals used within the building to the outside.

[0028] The effects obtainable from this post are not limited to those mentioned above, and other unmentioned effects will be clearly understood by a person with ordinary knowledge in the technical field to which this post belongs from the description below.

[0029]

[0030] Figure 1 is a drawing illustrating a low-E film having unit cells repeatedly arranged therein that include a specific frequency electromagnetic wave blocking pattern formed by removing a portion of the low-E film.

[0031] FIGS. 2a to 2c are three-dimensional views illustrating glass coated with a low-E film of various embodiments for comparison.

[0032] FIGS. 3a to 3c are drawings illustrating a unit cell of a structure contrasting with one embodiment of the present invention and a specific frequency electromagnetic wave blocking pattern inside the same.

[0033] FIGS. 4a to 4c are graphs showing the specialized network frequency electromagnetic wave blocking performance according to a unit cell of a structure contrasting with one embodiment of the present invention and a specific frequency electromagnetic wave blocking pattern inside the same.

[0034] FIGS. 5a to 5c are graphs showing frequency-selective electromagnetic wave transmission and blocking performance according to the spacing of unit cells repeatedly arranged on a low-E film according to different embodiments of the present invention.

[0035] FIG. 6 is a diagram illustrating the arrangement structure of unit cells repeatedly arranged on a low-E film according to another embodiment of the present invention.

[0036] FIGS. 7a and 7b are graphs showing frequency-selective electromagnetic wave transmission and blocking performance according to the arrangement structure of unit cells repeatedly arranged on a low-E film according to different embodiments of the present invention.

[0037] FIGS. 8a to 8c are drawings illustrating the pattern structure of an electromagnetic wave transmission region within a unit cell according to different embodiments of the present invention.

[0038] FIGS. 9a to 9c are graphs showing frequency-selective electromagnetic wave transmission and blocking performance according to the pattern structure of the region excluding the specific frequency electromagnetic wave blocking pattern within the unit cell according to different embodiments of the present invention.

[0039] FIG. 10 is a graph showing frequency-selective electromagnetic wave transmission and blocking performance according to the width of the slit and the width between the patterns of the region excluding the specific frequency electromagnetic wave blocking pattern according to various embodiments of the present invention.

[0040] FIGS. 11a and 11b are graphs showing the frequency-selective electromagnetic wave transmission and blocking performance according to the sheet resistance of a low-E film and the line width of a specific frequency electromagnetic wave blocking pattern according to various embodiments of the present invention.

[0041] Figures 12a and 12b are graphs showing the transmission and blocking performance of electromagnetic waves by frequency according to the line width of the specific frequency electromagnetic wave blocking pattern of the first unit cell structure.

[0042]

[0043] The advantages and features of this post, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, this post is not limited to the embodiments described below but may be implemented in various different forms; these embodiments are provided merely to ensure that this post is complete and to fully inform those skilled in the art of the scope of this post, and this post is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0044] When one component is referred to as being "connected to" or "coupled to" another component, it includes cases where it is directly connected or coupled to the other component, or cases where another component is interposed. Conversely, when one component is referred to as being "directly connected to" or "directly coupled to" another component, it indicates that no other component is interposed. "And / or" includes each of the mentioned items and all combinations of one or more of them.

[0045] The terms used herein are for describing the embodiments and are not intended to limit this post. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0046] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another.

[0047] Therefore, it is obvious that the first component mentioned below may be the second component within the technical scope of this post. Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which this post pertains. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise. Additionally, in the drawings, the thicknesses, proportions, and dimensions of the components are exaggerated for the effective description of the technical content. "And / or" includes all one or more combinations that the associated components may define.

[0048] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0049] Low-E film can be applied to glass in buildings or windows in automobiles for thermal insulation purposes and may include a metal coating layer in which silver (Ag) or a metal oxide is thinly coated on the insulating layer. When Low-E film is coated over the entire glass of a building, it may interfere with the transmission of electromagnetic waves and cause communication interference indoors. To solve this problem, it is necessary to remove the metal coating layer of the Low-E film according to a certain pattern so that electromagnetic waves, particularly those having frequencies in the commercial network frequency band, can pass through the Low-E film. In addition, in the case of specialized networks used for internal communication in companies, research facilities, etc., there is a need to prevent signal leakage to the outside for security purposes, so it is necessary to further remove the metal coating layer of the Low-E film (10) according to a certain pattern to block the transmission of electromagnetic waves having frequencies corresponding to the specialized network frequency band.

[0050] This document proposes a low-E film with an added pattern that allows for frequency-selective transmission or blocking of electromagnetic waves while reducing the degradation of the thermal insulation effect, which is the original function of the low-E film.

[0051] FIG. 1 is a drawing illustrating a low-E film having a pattern that allows for frequency-selective transmission or blocking.

[0052] Referring to FIG. 1, the pattern may be a shape that appears while removing a portion of the low-E film, and unit cells (20) having a pattern that allows for frequency-selective transmission or blocking may be repeatedly arranged on the low-E film (10). Here, the unit cells (20) may be square in shape, but may be rectangular in shape according to another embodiment.

[0053] A specific frequency electromagnetic wave blocking pattern (30) can be formed by removing the low-E film (10) in a specific pattern. According to one embodiment, the specific frequency electromagnetic wave blocking pattern (30) may be in the shape of a circular ring formed by two concentric circles having different radii. At this time, the low-E film is removed along the arcs of the two concentric circles, and the part where the low-E film is removed forms a narrow gap between the low-E films, which can be referred to as a slit, and a circular ring-shaped pattern may appear by the two concentric slits. According to one embodiment, the center of the two concentric circles may be the center of the unit cell (20). In this case, the difference in the radii of the two concentric circles of the specific frequency electromagnetic wave blocking pattern (30) can be referred to as the specific frequency electromagnetic wave blocking pattern line width (40), and the diameter of the larger of the two concentric circles can be referred to as the specific frequency electromagnetic wave blocking pattern diameter (50).

[0054] In the area (90) of the low-E film (10) excluding the specific frequency electromagnetic wave blocking pattern (30) in the unit cell (20), a transmission pattern for transmitting electromagnetic waves of a specific frequency band may be formed. The area where the electromagnetic wave transmission pattern is formed may be referred to as the electromagnetic wave transmission area (90). The electromagnetic wave transmission pattern formed in the electromagnetic wave transmission area (90) may be a pattern structure in which regular shapes are repeated. According to one embodiment, as shown in FIG. 1, square shapes may be repeated in the electromagnetic wave transmission area (90).

[0055] According to one embodiment, unit cells (20) may be arranged isotropically in a Roy film (10) as shown in FIG. 1. For example, the unit cells (20) may be arranged so that the center of the unit cell (20) provided in the first row or first column is located on a straight line where the unit cells of the adjacent row (second row) or column (second column) meet.

[0056] FIGS. 2a to 2c are three-dimensional views illustrating glass coated with a low-E film of various embodiments.

[0057] FIG. 2a is a three-dimensional view illustrating an example of glass coated with a patternless low-E film according to one embodiment.

[0058] Referring to FIG. 2a, a low-E film (12) without a pattern that allows electromagnetic waves to pass through can be coated or bonded to glass (110). The low-E film (12) can be formed on the glass (110) as shown in FIG. 2a. In this case, if the low-E film (12) is attached to the front surface of the glass and there is no pattern that allows electromagnetic waves to pass through the low-E film (12), this can be referred to as a front low-E film structure (1000). In the case of a front low-E film structure (1000), the entire unit cell area can be seen as being coated with the low-E film (12). While this provides excellent thermal insulation, there may be problems with electromagnetic wave reflection due to induced current and communication blocking due to shielding effects.

[0059] FIG. 2b is a three-dimensional view illustrating an example of glass coated with a low-E film having a grid pattern formed thereon according to one embodiment.

[0060] Referring to FIG. 2b, a low-E film (14) with a grid pattern formed thereon can be coated on glass to solve the problem of electromagnetic wave reflection and shielding of the front low-E film structure (1000). The portion where the low-E film (14) is removed to form the grid pattern can be referred to as a slit (100). The low-E film (40) can be divided into square pieces of low-E film by the slit (100). At this time, the length of one side of the square pieces of low-E film formed by the grid pattern can be set to 1 / 20 to 1 / 40 times the center frequency of the frequency range of the electromagnetic waves to be transmitted. As shown in FIG. 2b, the pattern formed by the slits (100) provided at regular intervals in the horizontal and vertical directions can be referred to as a grid transmission pattern.

[0061] FIG. 2c is a three-dimensional view illustrating an example of glass coated with a low-E film having a frequency-selective electromagnetic wave transmission and blocking pattern formed according to one embodiment of the present invention.

[0062] Referring to FIG. 2c, a low-E film (10) having a frequency-selective electromagnetic wave transmission and blocking pattern may be coated on glass (110). According to one embodiment, a PET layer (polyethylene terephthalate layer) (120) may be additionally provided between the glass (110) and the low-E film (10), so that the low-E film (10) may be deposited on the PET layer (120). The thickness of the PET layer (120) may be 1 / 50 or less of the thickness of the glass (110). The center distance between one unit cell (20) and the closest other unit cell (20) may be called the unit cell arrangement spacing (80).

[0063] FIGS. 3a to 3c are drawings illustrating a unit cell having a specific frequency electromagnetic wave blocking pattern according to various embodiments of the present invention.

[0064] FIG. 3a is a drawing illustrating a unit cell having a specific frequency electromagnetic wave blocking pattern in the shape of a circular ring according to one embodiment of the present invention.

[0065] Referring to FIG. 3a, a specific frequency electromagnetic wave blocking pattern (30) in the shape of a circular ring formed by two concentric circles of different sizes centered on the center of the unit cell may be formed in the first unit cell (1210). The specific frequency electromagnetic wave blocking pattern (30) may have different specific frequency electromagnetic wave blocking pattern line widths (40) and specific frequency electromagnetic wave blocking pattern diameters (50) depending on the frequency of the specialized network to be blocked. A grid pattern may be formed in the remaining transmission area excluding the specific frequency electromagnetic wave blocking pattern (30) of the unit cell (20).

[0066] As the specific frequency electromagnetic wave blocking pattern line width (40) increases, the characteristic of blocking electromagnetic waves in a specific frequency range is improved, but in this case, there may be a problem in that the range of change of the blocked frequency increases depending on the incident angle and incident direction of the radio waves. Accordingly, according to one embodiment, the specific frequency electromagnetic wave blocking pattern line width (40) can be set to a length of 0.135 times or less of the wavelength of the electromagnetic wave of the frequency to be blocked.

[0067] According to one embodiment, assuming the thickness of the commonly used glass (110) is 5 mm and the dielectric constant of the glass (110) is 6.5 V / m, the diameter (50) of the specific frequency electromagnetic wave blocking pattern can be set within the range of 0.35 to 0.5 times the wavelength of the electromagnetic wave of the frequency to be blocked. When the frequency of the specialized network is considered to be 4.7 GHz, the wavelength of the specialized network is 37.2 mm, and in this case, the diameter (50) of the specific frequency electromagnetic wave blocking pattern can be set between 13.02 mm and 18.6 mm.

[0068] FIG. 3b is a drawing illustrating a unit cell having a square specific frequency electromagnetic wave blocking pattern according to one embodiment of the present invention.

[0069] Referring to FIG. 3b, a specific frequency electromagnetic wave blocking pattern (32) can be formed in the second unit cell (1220) by two squares of different sizes centered on the center of the unit cell. According to one embodiment, the specific frequency electromagnetic wave blocking pattern line width (42) corresponding to 0.5 times the difference in side lengths of the squares can be set to 0.135 times or less the wavelength of the electromagnetic wave of the frequency to be blocked, and the length (52) of the specific frequency electromagnetic wave blocking pattern can be set within the range of 0.35 to 0.5 times the wavelength of the electromagnetic wave of the frequency to be blocked.

[0070] FIG. 3c is a drawing illustrating a unit cell having a cross-shaped specific frequency electromagnetic wave blocking pattern according to one embodiment of the present invention.

[0071] Referring to FIG. 3c, a cross-shaped specific frequency electromagnetic wave blocking pattern (34) can be formed in the third unit cell (1230) in which two rectangles of the same size are orthogonal to each other. At this time, one side of each rectangle pattern can be formed parallel to the opposite side of the third unit cell (1230). According to one embodiment, the line width (44) of the specific frequency electromagnetic wave blocking pattern can be set to 0.135 times or less the wavelength of the electromagnetic wave of the frequency to be blocked, and the length (54) of the specific frequency electromagnetic wave blocking pattern can be set within the range of 0.35 to 0.5 times the wavelength of the electromagnetic wave of the frequency to be blocked.

[0072] FIGS. 4a to 4c is a graph showing the specialized network frequency electromagnetic wave blocking performance of the first to third unit cells having a frequency electromagnetic wave blocking pattern of a specific shape shown in FIGS. 3a to 3c.

[0073] FIG. 4a is a graph showing the transmission performance according to the frequency of the TM mode component of electromagnetic waves incident on the first unit cell (1210) from different directions at the same angle of incidence.

[0074] Electromagnetic waves can have all polarization vibration directions of 360 degrees with respect to the direction of propagation, and can be expressed as two components that are mutually perpendicular and perpendicular to the direction of propagation: TE mode (Transverse Electric Mode) and TM mode (Transverse Magnetic Mode). The TE mode refers to a component that vibrates in a direction perpendicular to the plane containing the incident light, while the TM mode vibrates on the plane containing the incident light. The component that shows a relatively larger difference in transmission performance depending on the angle of incidence of the incident electromagnetic wave is the TE mode component of the electromagnetic wave; however, since there is no significant difference in transmission tendency, the component analyzed may differ depending on the embodiment.

[0075] Referring to FIG. 4a, the first to fourth embodiment results (1600, 1601, 1602, 1603) illustrate the transmission performance according to the frequency of the TM mode component of electromagnetic waves incident from different directions at an angle of incidence of 70 degrees. In Graph 1 (1211) and the graph below, the x-axis represents the frequency of the electromagnetic waves (unit: GHz), and the y-axis represents the degree of loss (unit: dB) as the electromagnetic waves pass through the low-E film and glass (110).

[0076] The first embodiment result (1600) is the transmission performance result of the TM mode component of the electromagnetic wave incident in a direction perpendicular to one side of the unit cell (20). The second to fourth embodiment results (1601, 1602, 1603) can be obtained by changing the direction of incidence of the electromagnetic wave in a clockwise or counterclockwise direction by 15 degrees from the direction of incidence of the electromagnetic wave in the first embodiment result (1600). According to one embodiment, the center frequency of the specialized network to be blocked can be set to 4.7 GHz, and with reference to Graph 1 (1211) of FIG. 4a, for the electromagnetic wave incident on the first unit cell (1210), even if the direction of incidence changes, the loss of the electromagnetic wave in the corresponding frequency band can be constant and large, while the loss of the electromagnetic wave in other frequency bands can be relatively small.

[0077] Figure 4b is a graph showing the transmission performance according to the frequency of the TM mode component of electromagnetic waves incident on the second unit cell from different directions at the same angle of incidence.

[0078] Referring to FIG. 4b, the 5th to 8th embodiment results (1604, 1605, 1606, 1607) illustrate the transmission performance according to the frequency of the TM mode component of electromagnetic waves incident from different directions at an angle of incidence of 70 degrees.

[0079] The fifth embodiment result (1604) is the transmission performance result of the TM mode component of the electromagnetic wave incident in a direction perpendicular to one side of the second unit cell (1220). The sixth to eighth embodiment results (1605, 1606, 1607) can be obtained by changing the direction of incidence of the electromagnetic wave in the fifth embodiment result (1604) by 15 degrees in a clockwise or counterclockwise direction. According to one embodiment, when the intermediate frequency of the specialized network to be blocked is set to 4.7 GHz, it can be seen that for the electromagnetic wave incident on the second unit cell (1220), the blocking performance differs from Graph 1 (1211) for the first unit cell (1210) as the direction of incidence changes. For example, the loss may not be significant for electromagnetic waves in the blocking frequency band incident from a specific direction.

[0080] Figure 4c is a graph showing the transmission performance according to the frequency of the TM mode component of electromagnetic waves incident on the third unit cell from different directions at the same angle of incidence.

[0081] Referring to FIG. 4c, the 9th to 12th embodiment results (1608, 1609, 1610, 1611) illustrate the transmission performance according to the frequency of the TM mode component of electromagnetic waves incident from different directions at an angle of incidence of 70 degrees.

[0082] The ninth embodiment result (1608) is the transmission performance result of the TM mode component of the electromagnetic wave incident in a direction perpendicular to one side of the third unit cell (1230). The tenth to twelfth embodiment results (1609, 1610, 1611) can be obtained by changing the direction of incidence of the electromagnetic wave in the ninth embodiment result (1608) by 15 degrees clockwise or counterclockwise. According to one embodiment, the intermediate frequency of the specialized network to be blocked can be set to 4.7 GHz, and regarding the electromagnetic wave incident on the third unit cell (1230), as the direction of incidence changes, it can be seen that the blocking area frequency band is improved compared to the result of graph 2 (1221) for the second unit cell, but still different from the result of graph 1 (1211) for the first unit cell (1210).

[0083] When comparing the results of graphs 1 to 3 (1211, 1221, 1231) according to the difference in specific frequency electromagnetic wave blocking patterns, it can be seen that the first unit cell (1210) having a specific frequency electromagnetic wave blocking pattern in the shape of a circular ring, which exhibits the same characteristics for all incident directions, shows more consistent transmission performance for the incident direction compared to the unit cell having a specific frequency electromagnetic wave blocking pattern of a different shape.

[0084] FIGS. 5a to 5c are graphs showing frequency-selective electromagnetic wave transmission and blocking performance according to the spacing of unit cells repeatedly arranged on a low-E film according to different embodiments of the present invention.

[0085] According to one embodiment, the intermediate frequency of the frequency band of the specialized network to be blocked can be set to 4.7 GHz, and the frequency of the commercial network to be transmitted can be set to a frequency band of 3.5 GHz or lower.

[0086] As the spacing between unit cells (1210) on the Roy film (10) increases, the performance of transmitting commercial network frequencies below 3.5 GHz is improved, but the performance of blocking specialized network frequencies around 4.7 GHz may be weakened. Here, increasing the spacing between unit cells (1210) may mean that the unit cells (1210) become larger. Also, as the spacing between unit cells (1210) increases, the change in blocking performance according to the direction of incidence may increase. Accordingly, it may be required to set the spacing between unit cells (1210) large within a range that minimizes the blocking of specialized network frequencies and the change in blocking performance according to the direction of incidence.

[0087] Figure 5a is a graph comparing the degree of transmission of the electromagnetic wave TE mode component according to the spacing of the first unit cell.

[0088] Referring to FIG. 5a, the 13th to 16th embodiment results (1612, 1613, 1614, 1615) show the transmission performance according to the frequency of the TE mode component of the electromagnetic wave when the electromagnetic wave is incident from the same direction at the same angle of incidence (60 degrees) on the Roy film in which the first unit cell (1210) is arranged at different intervals.

[0089] The 13th embodiment result (1612) shows the degree of transmission of electromagnetic waves by frequency when the spacing (80) of the first unit cell (1210) is set to 17.5 mm. The 14th embodiment result (1613) shows the degree of transmission of electromagnetic waves by frequency when the spacing (80) of the first unit cell (1210) is set to 21.5 mm. The 15th embodiment result (1614) shows the degree of transmission of electromagnetic waves by frequency when the spacing (80) of the first unit cell (1210) is set to 25.5 mm. The 16th embodiment result (1615) shows the degree of transmission of electromagnetic waves by frequency when the spacing (80) of the first unit cell (1210) is set to 29.5 mm. According to the 13th to 16th embodiment results (1612, 1613, 1614, 1615) illustrated in FIG. 5a, it can be seen that the larger the spacing (80) between the first unit cells (1210), the better the overall transmission performance of electromagnetic waves, particularly the transmission performance of electromagnetic waves with a frequency of 3.5 GHz or lower according to one embodiment. However, it can be seen that the blocking performance deteriorates when the spacing (80) between the first unit cells (1210) increases.

[0090] FIG. 5b is a graph comparing the degree of transmission of the TE mode component of electromagnetic waves incident from different directions but with the same angle of incidence on a low-E film in which the first unit cells are arranged at a spacing of 17.5 mm.

[0091] Referring to FIG. 5b, the 17th to 20th embodiment results (1616, 1617, 1618, 1619) show the transmission performance according to the frequency of the TE mode component of electromagnetic waves incident from different directions at an angle of incidence of 60 degrees.

[0092] The 17th embodiment result (1616) is the result of setting the spacing (80) of the first unit cell (1210) to 17.5 mm and the TE mode component of the electromagnetic wave incident in a direction perpendicular to one side of the first unit cell (1210). The 18th to 20th embodiment results (1617, 1618, 1619) can be obtained by changing the direction of incidence clockwise or counterclockwise by 15 degrees from the direction of incidence of the 17th embodiment result (1616). By referring to the 17th to 20th embodiment results (1616, 1617, 1618, 1619) of graph 5 (1241) shown in FIG. 5b, it can be seen that generally similar transmission-blocking performance is exhibited regardless of the direction of incidence. However, as the spacing (80) of the first unit cell (1210) is relatively small, in the case of a commercial network using a frequency range of 3.5 GHz or less, a large loss of 10 dB or more may occur.

[0093] FIG. 5c is a graph comparing the degree of transmission of electromagnetic wave TE mode components incident from different directions but with the same angle of incidence on a Roy film in which the first unit cells are arranged at a spacing of 29.5 mm.

[0094] Referring to FIG. 5c, the 21st to 24th embodiment results (1620, 1621, 1622, 1623) show the transmission performance according to the frequency of the TE mode component of electromagnetic waves incident from different directions at an angle of incidence of 60 degrees.

[0095] The 21st implementation result (1620) is the result of setting the spacing (80) of the unit cell (20) to 29.5 mm and the TE mode component of the electromagnetic wave incident in a direction perpendicular to one side of the first unit cell (1210). The 22nd to 24th implementation results (1621, 1622, 1623) can be obtained by changing the direction of incidence clockwise or counterclockwise by 15 degrees from the direction of incidence of the 21st implementation result (1620). At this time, as shown in FIG. 5c, it can be seen that the blocking performance for the blocking frequency band is poor. According to one embodiment, if the specialized network frequency to be blocked is set to around 4.7 GHz and the commercial network frequency to be transmitted is set to 3.5 GHz or lower, the transmission performance of the commercial network may be superior to the implementation result of Graph 5 (1241) shown in FIG. 5b, but a problem may arise in which the blocking performance of the specialized network frequency is degraded.

[0096] Accordingly, in order to selectively block the specialized network and transmit the commercial network, it may be required to set the spacing (80) between unit cells (20) to between 17.5 mm and 29.5 mm, and according to one embodiment, the spacing between unit cells may be set to 23.5 mm.

[0097] FIG. 6 is a drawing illustrating a low-E film having a unit cell arrangement structure according to another embodiment of the present invention.

[0098] Referring to FIG. 6, the arrangement structure of unit cells according to another embodiment of the present invention differs from the isotropic pattern structure shown in FIG. 1 in that there are four other unit cells (20) closest to a unit cell (20), and they can be arranged at equal intervals in the up, down, left, and right directions. Furthermore, the pattern structure may be such that a straight line connecting the center of each unit cell (20) closest to a unit cell (20) is perpendicular to one side of the unit cell (20) through which the straight line passes. The low-E film (10) can be removed to reveal this pattern shape. The structure shown in FIG. 6 may be referred to as a square arrangement structure.

[0099] FIGS. 7a and 7b are graphs showing frequency-selective electromagnetic wave transmission and blocking performance according to the arrangement structure of unit cells repeatedly arranged on a low-E film according to different embodiments of the present invention.

[0100] Figure 7a is a graph showing the degree of frequency transmission when electromagnetic waves are incident on glass coated with a low-E film having a pattern of square arrangement structures and glass not coated with a low-E film.

[0101] Referring to Fig. 7a, the degree of transmission of the electromagnetic wave TE mode component is shown when electromagnetic waves are incident on glass coated with a low-E film including a square arrangement structure pattern and glass not coated with a low-E film.

[0102] In Graph 7 (1250) of FIG. 7a, the two embodiment results (1630, 1631) with high overall transmittance are the case where electromagnetic waves are incident on glass without a low-E film at an angle of incidence of 60 degrees (1630) and the case where electromagnetic waves are incident on glass coated with a low-E film containing a square arrangement structure pattern at an angle of incidence of 0 degrees (1631). The other four embodiment results are the case where electromagnetic waves are incident on glass coated with a low-E film containing a square arrangement structure pattern at an angle of incidence of 60 degrees in different directions with a sequential difference of 15 degrees.

[0103] According to one embodiment, if the intermediate frequency of the specialized network frequency to be blocked is set to 4.7 GHz and the commercial network frequency band to be transmitted is set to 3.5 GHz or lower, as can be seen in Graph 7 (1250), the low-E film having a square arrangement structure pattern exhibits transmission performance similar to that of glass without low-E film coating in the commercial network frequency band only when the angle of incidence is 0 degrees (1631), and for other angles of incidence, it exhibits transmission performance much lower than that of glass without low-E film coating. It can also be seen that the transmission performance in the specialized network frequency band varies significantly depending on the angle of incidence. It can be seen that in certain directions, the transmission performance in the specialized network frequency band is higher than the transmission performance in the commercial network frequency band.

[0104] Figure 7b is a graph showing the degree of frequency transmission when electromagnetic waves are incident on glass coated with a low-E film having an isotropic arrangement structure pattern or on glass not coated with a low-E film.

[0105] Referring to FIG. 7b, the two embodiments (1633, 1634) with high overall transmittance in graph 8 (1251) are the case where electromagnetic waves are incident on glass without a low-E film at an angle of incidence of 60 degrees (1633) and the case where electromagnetic waves are incident on glass coated with a low-E film having an isotropic arrangement structure pattern at an angle of incidence of 0 degrees (1634). The other four embodiments are the results of electromagnetic waves being incident on glass coated with a low-E film including an isotropic arrangement structure pattern at an angle of incidence of 60 degrees in different directions with a sequential difference of 15 degrees.

[0106] According to one embodiment, when the center frequency of the specialized network frequency to be blocked is set to 4.7 GHz and the commercial network frequency band to be transmitted is set to 3.5 GHz or lower, as can be seen in Graph 8 (1251), the transmission performance in the commercial network frequency band is similar to that of glass without a low-E film coating only when the angle of incidence is 0 degrees, and for other angles of incidence, the transmission performance is much lower than that of glass without a low-E film coating. However, in the specialized network frequency band of 4.7 GHz, the low-E film having an isotropic arrangement structure pattern has a smaller range of change in the transmission-blocking tendency according to the direction of incidence of electromagnetic waves compared to the low-E film including a square arrangement structure pattern, and the transmission performance in the specialized network frequency band in all directions is smaller than the transmission performance in the commercial network frequency band.

[0107] Therefore, to maintain the desired transmission-blocking performance consistently for all incident directions, it may be advantageous to apply an isotropic arrangement structure pattern rather than a square arrangement structure pattern.

[0108] FIGS. 8a to 8c are drawings illustrating electromagnetic wave transmission pattern structures within a unit cell according to different embodiments of the present invention.

[0109] Figure 8a is a diagram illustrating an electromagnetic wave transmission area with a grid transmission pattern applied.

[0110] Referring to FIG. 8a, the electromagnetic wave transmission area (90) of the first unit cell (1210) can be divided into two transmission areas: the inner part of the inner concentric circle of the circular ring and the outer part of the outer concentric circle, by a specific frequency electromagnetic wave blocking pattern (30) in the shape of a circular ring. At this time, a pattern can be formed in the electromagnetic wave transmission area (90) that divides the low-E film of the transmission area into squares of the same size by straight slits (100) at regular intervals that are orthogonal, such as the grid transmission pattern (1100) shown in FIG. 2b. At this time, the width of the slit (100) forming the circular ring, which is the specific frequency electromagnetic wave blocking pattern (30), and the slit (100) forming the grid transmission pattern of the electromagnetic wave transmission area can be the same. According to one embodiment, the width of the slit (100) can be set to 0.2 mm. In this case, according to one embodiment, the length of one side of the square partitioned by the slit (100) in the electromagnetic wave transmission area (90) can be formed to be between 1 / 20 and 1 / 40 of the wavelength of the electromagnetic wave of the frequency to be transmitted. The transmission pattern structure illustrated in FIG. 8a may be referred to as a grid transmission pattern structure.

[0111] Figure 8b is a diagram illustrating an electromagnetic wave transmission area with a triangular transmission pattern applied.

[0112] Referring to FIG. 8b, in the electromagnetic wave transmission area (90) of the first unit cell (1210), a pattern may be formed to divide the low-E film of the electromagnetic wave transmission area (90) into equilateral triangles of the same size by straight slits in three directions at regular intervals forming angles of 60 degrees to each other. At this time, the width of the straight slits (100) may all be the same. According to one embodiment, the width of the slits (100) may be set to 0.2 mm. At this time, according to one embodiment, the height of each equilateral triangle low-E film piece divided by the slits (100) in the electromagnetic wave transmission area (90) may be formed to be between 1 / 20 and 1 / 40 of the wavelength of the electromagnetic wave of the frequency to be transmitted. The transmission pattern structure illustrated in FIG. 8b may be referred to as an equilateral triangle transmission pattern structure.

[0113] Figure 8c is a diagram illustrating an electromagnetic wave transmission area with a hexagonal transmission pattern applied.

[0114] Referring to FIG. 8c, a slit may be formed in the electromagnetic wave transmission area (90) of the first unit cell (1210) to divide the Roy film into repeating hexagonal pieces of the same size. The width of the slit (100) may be the same. According to one embodiment, the width of the slit (100) may be set to 0.2 mm. Each hexagonal piece may share one side with the six adjacent other hexagonal pieces. The transmission pattern structure illustrated in FIG. 8c may be referred to as a hexagonal transmission pattern structure.

[0115] Figures 9a to 9c are graphs showing frequency-selective electromagnetic wave transmission and blocking performance according to grid, equilateral triangle, and regular hexagon transmission pattern structures, respectively.

[0116] Figure 9a is a graph showing the degree of transmission of the frequency of the electromagnetic wave TE mode component when electromagnetic waves are incident on glass coated with a low-E film having an isotropic arrangement blocking pattern and a grid transmission pattern structure, or on glass not coated with a low-E film.

[0117] Referring to FIG. 9a, Graph 9 (1260) shows the degree of transmission of the electromagnetic wave TE mode component when an electromagnetic wave is incident on glass coated with a low-E film having an isotropic arrangement structure blocking pattern and the grid transmission pattern structure of FIG. 8a, and on bare glass without a low-E film. Two embodiments (1640, 1641) with high overall transmittance in Graph 9 (1260) are the case where an electromagnetic wave is incident on bare glass without a low-E film at an angle of incidence of 60 degrees (1640) and the case where an electromagnetic wave is incident on glass coated with a low-E film including an isotropic arrangement structure pattern and a grid transmission pattern structure at an angle of incidence of 0 degrees (1641). The other four embodiments (1642) are the results of electromagnetic waves being incident on glass coated with a low-E film including an isotropic arrangement structure pattern and a lattice transmission pattern structure at an angle of incidence of 60 degrees in different directions with a difference of 15 degrees.

[0118] Referring to graph 9 (1260) shown in FIG. 9a, when comparing the transmission performance (1640) of glass without a low-E film coating and the transmission performance (1642) of glass coated with a low-E film including an isotropic arrangement structure pattern and a grid transmission pattern structure when electromagnetic waves are incident at an angle of incidence of 60 degrees, it can be seen that due to the coating of the low-E film, the transmission performance (1642) of glass coated with a low-E film including an isotropic arrangement structure pattern and a grid transmission pattern structure in the 3.5 GHz frequency band of a commercial network is lower than the transmission performance (1640) of glass without a low-E film coating, but the blocking performance in the 4.7 GHz frequency band of a specialized network is much improved in the case of glass coated with a low-E film including an isotropic arrangement structure pattern and a grid transmission pattern structure compared to glass without a low-E film coating. In addition, due to the presence of a slit (100) that forms a pattern, which is not shown, the transmission performance of the glass coated with a low-E film including an isotropic arrangement structure pattern and a grid transmission pattern structure can be significantly improved compared to the glass coated with a low-E film on the front surface shown in FIG. 2a. Therefore, the low-E film including the isotropic arrangement structure pattern and the grid transmission pattern structure shown in FIG. 8a can achieve the purpose of this publication, which is to transmit signals in the commercial network frequency band and block signals in the specialized network frequency band.

[0119] In addition, FIG. 9b is a graph showing the degree of transmission of the electromagnetic wave TE mode component when an electromagnetic wave is incident on glass coated with a low-E film having an isotropic arrangement blocking pattern and a triangular transmission pattern structure, or on glass not coated with a low-E film, and FIG. 9c is a graph showing the degree of transmission of the electromagnetic wave TE mode component when an electromagnetic wave is incident on a low-E film having an isotropic arrangement blocking pattern and a hexagonal transmission pattern structure, or on glass coated with a low-E film or on glass not coated with a low-E film.

[0120] In graph 10 (1261) of FIG. 9b and graph 11 (1262) of FIG. 9c, the two embodiment results (1642, 1643) showing high transmittance in the overall transmission region are cases where electromagnetic waves are incident on bare glass without a low-E film at an angle of incidence of 60 degrees (1643, 1646) and cases where electromagnetic waves are incident on glass coated with a low-E film at an angle of incidence of 0 degrees (1644, 1647). In each graph, the other four embodiment results (1645, 1648) are results where electromagnetic waves are incident on glass coated with a low-E film at an angle of incidence of 60 degrees in different directions with a sequential difference of 15 degrees.

[0121] Referring to FIGS. 9b and 9c, similar to FIG. 9a, it can be seen that the transmittance performance (1645, 1648) of glass coated with a low-E film in the 3.5 GHz frequency band of a commercial network is lower than that of glass not coated with a low-E film (1643, 1646), but the blocking performance in the 4.7 GHz frequency band of a specialized network is significantly improved in the case of glass coated with a low-E film compared to glass not coated with a low-E film. Additionally, although not shown, due to the presence of a slit (100) forming a pattern, the transmittance performance (1645, 1648) of glass coated with a low-E film including a pattern can be significantly improved compared to glass coated with a low-E film on the front surface as shown in FIG. 2a. Accordingly, the low-E film including the isotropic arrangement structure pattern and the equilateral triangle or regular hexagonal transmission pattern structure shown in FIGS. 8a and 8b can achieve the purpose of this publication, which is to transmit signals in the commercial network frequency band and block signals in the specialized network frequency band.

[0122] FIGS. 9a to 9c may be the result of setting the width of the slit (100), which forms the blocking pattern and the transmission pattern in the same way according to one embodiment, to 2 mm, and it can be seen that similar transmission performance is exhibited regardless of the shape of the transmission pattern. That is, if the transmission pattern is configured in the form of an isotropically repeating geometric shape, it can have the required transmission performance even if it is not limited to the embodiments shown in FIGS. 9a to 9c.

[0123] FIG. 10 is a graph showing the electromagnetic wave transmission performance by frequency according to the width of the slit and the spacing of the transmission pattern according to various embodiments of the present invention.

[0124] If the spacing of the transmission pattern provided in the electromagnetic wave transmission area (90) of the low-E film is reduced, or if the width of the slit (100) forming the electromagnetic wave transmission pattern is widened so that the area where the low-E film is removed increases, a high transmittance can be obtained in the commercial network band to be transmitted. According to one embodiment, if the width of the slit (100) for forming the pattern in the low-E film having the pattern shown in FIG. 8a is 0.2 mm and the spacing between the square low-E film pieces formed by the slit (100) is 2 mm, then electromagnetic waves in the commercial network frequency band set to 3 GHz or less can be transmitted with a small loss rate of 3 dB or less when compared to the transmittance of glass without the low-E film applied as shown in FIG. 10. In addition, according to another embodiment, if the width of the slit (100) forming the electromagnetic wave transmission pattern and the spacing between the pieces of the low-E film formed by the slit (100) are adjusted so that the proportion of the area occupied by the slit (100) in the size of the entire low-E film is increased, a higher transmittance can be obtained.

[0125] Referring to FIG. 10, graph 12 (1270) illustrates the frequency-dependent transmission characteristics of the electromagnetic wave TE mode component according to ordinary glass, the width of the slit (100) forming the electromagnetic wave transmission pattern, and the spacing of the transmission pattern (in A / B of the graph, A represents the width of the slit (100) and B represents the spacing of the transmission pattern). According to one embodiment, in order for the transmission pattern to transmit electromagnetic waves in the commercial frequency band of 3 GHz or less with a small loss rate of 3 dB or less, the width of the slit (100) and the spacing of the transmission pattern may need to be sufficiently small as in the above-described embodiment.

[0126] FIGS. 11a and 11b are graphs showing the frequency-selective electromagnetic wave transmission and blocking performance according to the sheet resistance of a low-E film and the line width of a specific frequency electromagnetic wave blocking pattern according to various embodiments of the present invention.

[0127] In the case of a metal conductor pattern formed with copper, etc., it can have high conductivity and very low sheet resistance, but in the case of silver, etc. used for coating the low-E film (10), a thin silver coating of about tens of nanometers is applied to the glass to maintain transparency for the original purpose of glass windows, etc. Accordingly, in the case of a low-E film with a single layer of silver coating, the cross-sectional area becomes very small, so the sheet resistance can be increased to the level of 5 ohm / sq. For efficient electromagnetic wave shielding, easy generation of induced current may be required, and to realize this, according to one embodiment, a low-E film with a laminated structure in which thin silver-coated low-E films are laminated can form a sheet resistance of 0.5 to 1.5 ohm / sq. In addition, a low-E film formed with a laminated structure can obtain higher transparency compared to a low-E film with a thick silver coating applied in one go. The embodiments to be described below are explained based on the premise of a plurality of low-E films (10) being laminated to have a sheet resistance in the range of 0.5 to 1.5 ohm / sq.

[0128] As the lower the sheet resistance, the higher the electromagnetic wave blocking performance in the specialized network frequency band, so even if the specific frequency electromagnetic wave blocking pattern line width (40) shown in FIG. 1 is set small, a large blocking performance of 10 dB or more can be achieved. Conversely, if the sheet resistance increases, a design that increases the specific frequency electromagnetic wave blocking pattern line width (40) may be required. This is because the generation of induced current may increase as the cross-sectional area of ​​the conductive surface of the specific frequency electromagnetic wave blocking pattern (30) widens.

[0129] FIG. 11a is a graph showing the transmission performance according to the frequency range of the electromagnetic wave TE mode component incident on a low-E film having a pattern of the first unit cell (1210) shown in FIG. 3 with a sheet resistance of 0.5 ohm / sq and the electromagnetic wave blocking pattern line width.

[0130] Referring to FIG. 11a, graph 13 (1280) illustrates the transmission performance according to the frequency domain when the specific frequency electromagnetic wave blocking pattern line width (40) of the first unit cell (1210) is 1 mm (1624), 3 mm (1625), and 5 mm (1626). According to one embodiment, the specialized network frequency to be blocked can be set to 4.7 GHz, and if the sheet resistance is sufficiently low, such as 0.5 ohm / sq, high blocking performance can be shown even when the specific frequency electromagnetic wave blocking pattern line width (40) is 1 mm (1624) in the corresponding frequency band.

[0131] FIG. 11b is a graph showing the transmission performance according to the frequency range of electromagnetic waves incident on a low-E film having a pattern of the first unit cell (1210) shown in FIG. 3 with a sheet resistance of 1.5 ohm / sq and the electromagnetic wave blocking pattern line width.

[0132] Referring to FIG. 11b, graph 14 (1281) shows the transmission performance according to the frequency domain when the specific frequency electromagnetic wave blocking pattern line width (40) of the first unit cell (1210) is 1 mm (1627), 3 mm (1628), and 5 mm (1629). According to one embodiment, the specialized network frequency to be blocked can be set to 4.7 GHz, and when the sheet resistance is about 1.5 ohm / sq, it may be difficult to secure blocking performance in the corresponding frequency band when the specific frequency electromagnetic wave blocking pattern line width (40) is 1 mm (1627). Accordingly, in one embodiment of the present invention, the specific frequency electromagnetic wave blocking pattern line width (40) can be set to 3 mm to secure a blocking performance of at least 10 dB stably for all electromagnetic wave incident directions.

[0133] Figures 12a and 12b are graphs showing the transmission and blocking performance of electromagnetic waves by frequency according to the line width of the specific frequency electromagnetic wave blocking pattern of the first unit cell structure.

[0134] If the specific frequency electromagnetic wave blocking pattern line width (40) is increased, the electromagnetic wave blocking performance of the specialized network frequency can be maintained at a high level even in a low-E film (10) with high sheet resistance, but in this case, the range of change in the transmission-blocking characteristics of the electromagnetic wave may increase depending on the angle of incidence and direction of the electromagnetic wave.

[0135] Figure 12a is a graph showing the TE mode transmission performance according to the incident direction of electromagnetic waves incident on the low-E film when the specific frequency electromagnetic wave blocking pattern line width of the first unit cell is 1 mm.

[0136] Referring to FIG. 12a, graph 15 (1290) shows the TE mode transmission performance of electromagnetic waves when electromagnetic waves with an incident angle of 60 degrees are sequentially incident from different directions differing by 15 degrees on a low-E film having a specific frequency electromagnetic wave blocking pattern line width (40) of 1 mm of the first unit cell (1210). Referring to graph 15 (1290), it can be seen that if the specific frequency electromagnetic wave blocking pattern line width (40) is set to 1 mm and the incident angle of the electromagnetic waves is 60 degrees, it does not exhibit high blocking performance of 10 dB for electromagnetic waves incident from different directions. However, stability can be ensured as the variability according to the incident direction is small.

[0137] FIG. 12b is a graph showing the TE mode transmission performance according to the incident direction of electromagnetic waves incident on the low-E film when the specific frequency electromagnetic wave blocking pattern line width of the first unit cell is 5 mm.

[0138] Referring to FIG. 12b, graph 16 (1291) shows the TE mode transmission performance of electromagnetic waves when electromagnetic waves with an incident angle of 60 degrees are sequentially incident from different directions differing by 15 degrees on a Ro-E film having a specific frequency electromagnetic wave blocking pattern line width (40) of 5 mm of the first unit cell (1210). Referring to graph 16 (1291), if the specific frequency electromagnetic wave blocking pattern line width (40) is set to 5 mm and the incident angle of the electromagnetic waves is 60 degrees, the blocking performance for electromagnetic waves incident from different directions may be excellent, but the variability of the blocking band may increase. Accordingly, according to one embodiment, the specific frequency electromagnetic wave blocking pattern line width (40) can be set to 3 mm to reduce the variability of the blocking band frequency while securing electromagnetic wave blocking performance.

[0139] This publication has been described with reference to embodiments illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of this publication should be determined by the technical concept of the appended claims.

Claims

1. An insulating layer composed of an insulating material; and It includes a metal coating layer in which a metal or metal oxide is coated on one surface of the insulating layer, and The metal coating layer is square in shape and consists of a plurality of unit cells arranged repeatedly, and Each of the above plurality of unit cells includes patterns formed as a portion of the metal coating layer is removed, and The above patterns are, A blocking pattern forming a blocking region for blocking electromagnetic waves of a first frequency band; and A transmission pattern formed in a transmission area, which is an area excluding the blocking area of ​​the unit cell, for passing electromagnetic waves of the second frequency band, comprising Roy Film.

2. In Paragraph 1, The above blocking pattern is in the form of a circular ring formed by two concentric slits having different radii centered on the center of the unit cell, Roy Film.

3. In Paragraph 1, The plurality of unit cells are arranged isotropically such that the center of a unit cell provided in an odd row on the insulating layer is located on a straight line where adjacent unit cells provided in an even row meet, thereby constituting the metal coating layer. Roy Film.

4. In Paragraph 3, The plurality of unit cells are arranged such that the distance between the centers of the two closest unit cells is less than or equal to half the wavelength of the electromagnetic wave corresponding to the intermediate frequency of the first frequency band. Roy Film.

5. In Paragraph 1, The above transmission pattern is a grid transmission pattern formed by a plurality of straight slits arranged at regular intervals in a first direction and a second direction orthogonal to the first direction while removing the metal coating layer. Roy Film.

6. In Paragraph 1, The above transmission pattern is an equilateral triangle transmission pattern formed by a plurality of first straight slits provided at regular intervals and parallel to one side of the unit cell, a plurality of second straight slits provided at regular intervals and forming an angle of 60 degrees with the first straight slits, and a plurality of third straight slits provided at regular intervals and forming an angle of 120 degrees with the first straight slits and an angle of 60 degrees with the second straight slits. Roy Film.

7. In Paragraph 1, The above transmission pattern is a regular hexagonal transmission pattern formed by a slit that divides the transmission area into a plurality of regular hexagonal regions of the same size. Roy Film.

8. In Paragraph 2, Characterized that the diameter of the outer concentric circle among the two concentric circles forming the circular ring-shaped blocking pattern is between 0.35 and 0.5 times the electromagnetic wave wavelength corresponding to the intermediate frequency of the first frequency band. Roy Film.

9. In Paragraph 2, Characterized that the difference in the radii of the two concentric circles forming the above circular ring-shaped blocking pattern is 0.135 times or less the wavelength of the electromagnetic wave corresponding to the intermediate frequency of the first frequency band. Roy Film.

10. In any one of paragraphs 2 through 9, Characterized that the width of the above slit is 0.2 mm or less, Roy Film.

11. Glass; A low-E film according to any one of claims 1 to 9 formed on the glass above, Roy Glass.

12. In Paragraph 11, A PET layer further comprising the above-mentioned low-E film and the above-mentioned glass, Roy Glass.

Images