Antenna device and antenna-equipped display device

Abstract

To provide an antenna device having improved antenna characteristics, and a display apparatus with the antenna.SOLUTION: An antenna device comprises: a substrate having a first principal surface and a second principal surface; a metal layer provided on the first principal surface; and a ground layer provided on the second principal surface at a position overlapping with the metal surface in plan view. The metal layer comprises: a coplaner waveguide; a slot antenna connected to the coplaner waveguide; an end side extending in an extension direction of the slot antenna; and a passive slot provided between the slot antenna and the end side.SELECTED DRAWING: Figure 4A

Description

[Technical Field]

[0001] The present disclosure relates to an antenna device and an antenna-equipped display device. [Background technology]

[0002]

[0003] A conventional aperture antenna (antenna device) includes a dielectric layer having first and second surfaces, a high-frequency line formed on the first surface of the dielectric layer and consisting of a line conductor and a ground conductor layer surrounding an end of the line conductor, a slot formed on the first surface of the dielectric layer so as to intersect the line conductor and be electromagnetically coupled to the line conductor, and a plurality of shield conductors formed inside the dielectric layer and surrounding the end of the line conductor and the slot in a planar perspective view, wherein the spacing between the shield conductors arranged in the extension direction of the line conductor is narrower than the spacing between the other shield conductors. This aperture antenna (antenna device) also includes a lower ground conductor layer on the second surface of the dielectric layer (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-266836 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when conductor layers are provided on the upper and lower surfaces (first and second surfaces) of a dielectric layer as in conventional antenna devices, reducing the thickness of the dielectric layer may result in unwanted transmission modes such as parallel plate modes, resulting in a decrease in directional gain or radiation efficiency. A decrease in directional gain or radiation efficiency means a decrease in antenna characteristics.

[0005] Therefore, an object of the present invention is to provide an antenna device and an antenna-equipped display device with improved antenna characteristics. [Means for solving the problem]

[0006] An antenna device according to an embodiment of the present disclosure includes a base having a first principal surface and a second principal surface, a metal layer provided on the first principal surface, and a ground layer provided on the second principal surface at a position overlapping with the metal layer in a planar view, the metal layer having a coplanar waveguide, a slot antenna connected to the coplanar waveguide, an end edge extending along the extension direction of the slot antenna, and a parasitic slot provided between the slot antenna and the end edge. [Effects of the Invention]

[0007] It is possible to provide an antenna device and an antenna-equipped display device with improved antenna characteristics. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an overall view showing an example of the position of an antenna device in an electronic device of an embodiment equipped with a display module. [Figure 2] 2 is a diagram showing an example of the configuration of the cross section of the electronic device of FIG. 1 taken along the line AA. [Figure 3] FIG. 2 is a plan view showing an example of the configuration of a metal mesh. [Figure 4A] 1 is a diagram illustrating an example of a configuration of an antenna device according to an embodiment; [Figure 4B] 1 is a diagram illustrating an example of a configuration of an antenna device according to an embodiment; [Figure 4C] 1 is a diagram illustrating an example of a configuration of an antenna device according to an embodiment; [Figure 5A] 4B is an enlarged cross-sectional view of a line portion in a cross section taken along the C1-C1 arrow in FIG. 4A. FIG. [Figure 5B] 4B is an enlarged cross-sectional view of a loop slot antenna portion in the cross section taken along the arrows C2-C2 in FIG. 4A. FIG. [Figure 5C] FIG. 4B is a cross-sectional view taken along the arrow BB in FIG. 4A. [Figure 6] FIG. 10 is a diagram illustrating an example of a simulation result. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments to which the antenna device and the antenna-equipped display device of the present disclosure are applied will be described. In the following, the same elements will be denoted by the same reference numerals, and duplicated explanations may be omitted.

[0010] The following description will be given by defining the XYZ coordinate system. Directions such as parallel, right-angled, orthogonal, horizontal, vertical, up-down, left-right, and so on are allowed to deviate to the extent that they do not impair the effects of the embodiments. The X, Y, and Z directions represent directions parallel to the X axis, the Y axis, and the Z axis, respectively. The X, Y, and Z directions are perpendicular to each other. The XY plane, YZ plane, and ZX plane represent imaginary planes parallel to the X and Y directions, imaginary planes parallel to the Y and Z directions, and imaginary planes parallel to the Z and X directions, respectively. The following description will use the up-down direction, with the +Z direction side being the top and the -Z direction side being the bottom, and the lateral direction (side) relative to the up-down direction, but these do not represent universal up-down and lateral directions. Planar view refers to viewing the XY plane from the +Z direction. The following description may exaggerate the length, width, thickness, and other dimensions of each component to make the configuration easier to understand.

[0011] In the following explanation, "radio waves" refers to a type of electromagnetic wave, and generally, electromagnetic waves below 3 THz are called radio waves. In the following, electromagnetic waves emitted from outdoor base stations or relay stations are called "radio waves," and electromagnetic waves in general are called "electromagnetic waves." In addition, in the following, when referring to "millimeter waves" or "millimeter wave band," it includes not only the frequency band of 30 GHz to 300 GHz, but also the quasi-millimeter wave band of 24 GHz to 30 GHz.

[0012] The radio waves transmitted or received by the antenna device and the antenna-equipped display device of the embodiment are preferably in the millimeter wave band of the fifth generation mobile communication system (5G) or in the 1 GHz to 30 GHz frequency band including Sub-6. The radio waves transmitted or received by the antenna device and the antenna-equipped display device of the embodiment may be Long Term Evolution (LTE), LTE-Advanced (LTE-A), or Ultra Mobile Broadband (UMB). The radio waves transmitted or received by the antenna device and the antenna-equipped display device of the embodiment may be IEEE802.11 (Wi-Fi (registered trademark)), IEEE802.16 (WiMAX (registered trademark)), IEEE802.20, Ultra-Wideband (UWB), Bluetooth (registered trademark), Low Power Wide Area (LPWA), or the like. The antenna device and the antenna-equipped display device of the embodiment are more suitable for communications using relatively high frequencies. In the following description, unless otherwise specified, the millimeter wave band and Sub-6 radio waves are used as examples.

[0013] <Embodiment> <Configuration of Electronic Device 200> The configuration of an electronic device 200, which is an example of a communication device equipped with a display module D including an antenna device 100 according to an embodiment, will be described with reference to Figures 1 and 2. Figure 1 is an overall view showing an example of the position of the antenna device 100 in the electronic device 200 equipped with the display module D. Figure 2 is a diagram showing an example of the configuration of a cross section of the electronic device 200 in Figure 1 taken along the line AA.

[0014] The electronic device 200 is, for example, an information processing terminal such as a smartphone, a tablet computer, a notebook PC (Personal Computer), etc. Furthermore, the electronic device 200 is not limited to these, and may be, for example, a structure such as a pillar or a wall, digital signage, an electronic device including a display panel inside a train, or an electronic device including various display panels inside a vehicle.

[0015] 1 and 2, a display module D capable of performing a display function is disposed on the entire top surface of the electronic device 200, or on at least a part of the top surface. The antenna device 100 is disposed above a touch panel 230 on a display panel 220. The antenna device 100 is visible from outside the electronic device 200 through a transparent cover 240, and is transparent so that the display panel 220 can be seen from the outside through the antenna device 100. The display panel 220 is an example of a display device. The display surface of the display panel 220 is the surface on the +Z direction side of the display panel 220.

[0016] The electronic device 200 includes the antenna device 100, a housing 210, a display panel 220, a touch panel 230, a transparent cover 240, a wiring board 250, electronic components 260A, 260B, 260C, and 260D, and a battery 270. Of the electronic device 200, the antenna device 100, the display panel 220, the touch panel 230, and the transparent cover 240 constitute a display module D. The display module D is an example of a display device with an antenna.

[0017] Here, as an example, a configuration will be described in which the antenna device 100 is transparent, is included in the electronic device 200, and is part of the display module D. However, the antenna device 100 does not have to be transparent. When the antenna device 100 is not provided on the display surface side of the display device, it does not have to be transparent.

[0018] Housing 210 is, for example, a case made of metal and / or resin, and covers the bottom and side surfaces of electronic device 200. Housing 210 has opening edge 211 at the upper end of the side wall, and transparent cover 240 is attached to opening edge 211. Housing 210 has storage section 212, which is an internal space that communicates with opening edge 211. The internal space surrounded by housing 210 and transparent cover 240 contains wiring board 250, electronic components 260A to 260D, battery 270, etc.

[0019] The display panel 220 is, for example, a liquid crystal display panel, an organic EL (Electro-luminescence) or an OLED (Organic Light Emitting Diode) display panel.

[0020] Touch panel 230 is provided on the display surface side (+Z direction side) of display panel 220. Touch panel 230 is a capacitance-type position detection device, and detects the coordinates of a user's fingertip or the like that touches the surface of transparent cover 240.

[0021] The transparent cover 240 is a transparent glass plate provided on the top surface, and has a size that matches the opening edge 211 of the housing 210 in a plan view. In this example, the transparent cover 240 is an example of a glass plate that is mostly flat and has both ends in the horizontal direction (±Y direction) that are gently curved downward, but it may also be a glass plate that is flat in the horizontal direction. Alternatively, the transparent cover 240 may also have both ends in the vertical direction (±X direction) of the electronic device 200 that are gently curved downward. Here, a form in which the transparent cover 240 is made of glass will be described, but the transparent cover 240 may also be made of resin.

[0022] Transparent cover 240 is attached to open end 211 of housing 210, thereby sealing storage section 212 of housing 210.

[0023] The upper surface of the transparent cover 240 is an example of the outer surface of the transparent cover 240, and the lower surface of the transparent cover 240 is an example of the inner surface of the transparent cover 240. The antenna device 100 and the touch panel 230 are provided on the inner surface side of the transparent cover 240. Because the transparent cover 240 is transparent, the touch panel 230 and the display panel 220 provided inside can be seen through the transparent cover 240 from the outside of the electronic device 200.

[0024] Electronic components 260A to 260C are mounted on wiring board 250. Power feed lines and the like shown by dashed lines in Fig. 2 are connected to wiring board 250. The power feed lines and the like connect antenna device 100 and wiring board 250. The power feed lines and the like that connect wiring board 250 and antenna device 100 may be connected using a connector, an ACF (Anisotropic Conductive Film), or the like, or may be connected using other components.

[0025] As an example, electronic component 260A is a communication module that is connected to antenna device 100 via wiring on wiring board 250 and a power supply line (see dashed line), and processes signals transmitted or received via antenna device 100. Furthermore, central electronic component 260B is, for example, a camera.

[0026] As an example, electronic components 260C and 260D are components that perform information processing related to the operation of electronic device 200, and are realized by a computer including, for example, a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), an input / output interface, and an internal bus.

[0027] The battery 270 is a rechargeable secondary battery, and supplies the power required for the operation of the display module D, the electronic components 260A to 260D, and the like.

[0028] <Metal Mesh Used in Antenna Device 100> 3 is a plan view showing an example of the configuration of the metal mesh 30. Before describing the configuration of the antenna device 100, the metal mesh 30 that can be used as the metal layer and ground layer of the antenna device 100 will be described here.

[0029] The metal mesh 30 is a transparent conductor and is formed on the upper surface 10A of the transparent substrate 10. The metal mesh 30 is a conductor with such high optical transparency that it is difficult for human eyesight to see. The metal mesh 30 can be used as a metal layer and a ground layer of the antenna device 100. The metal layer of the antenna device 100 has a slot-type radiating element. Here, as an example, the metal mesh 30 formed on the upper surface 10A of the transparent substrate 10 will be described.

[0030] The metal mesh 30 is a thin metal wire layer formed in a mesh shape, for example, to enhance light transmittance, and is a transparent conductor. The metal mesh 30 is arranged such that a plurality of thin metal wires 31 extending in one direction intersect with a plurality of thin metal wires 32 extending in the other direction, and openings (through holes) 33, which are mesh-like gaps (openings), are formed.

[0031] The openings 33 of the metal mesh 30 may be rectangular or rhombic. When the openings 33 are formed in a rectangular shape, the mesh preferably has square openings, which provides a good design. The openings 33 of the mesh may also have a random shape formed by a self-organization method, which can suppress moire. The line widths w31 and w32 of the fine metal wires 31 and 32, respectively, are preferably 1 μm to 10 μm, more preferably 1 μm to 5 μm, and even more preferably 1 μm to 3 μm. The line spacings (also referred to as openings or pitches) p31 and p32 between the plurality of fine metal wires 31 and between the plurality of fine metal wires 32 are preferably 300 μm to 500 μm.

[0032] The opening ratio, which is the ratio of the area of ​​the openings 33 to the entire area of ​​the metal mesh 30, is preferably 80% or more, and more preferably 90% or more. The larger the opening ratio of the metal mesh 30, the higher the visible light transmittance can be.

[0033] The thickness of the metal mesh 30 may be 1 μm to 40 μm. By forming the metal mesh 30 in a mesh shape, it is possible to increase the visible light transmittance even if the metal mesh 30 is thick. The thickness of the metal mesh 30 is more preferably 5 μm or more, and even more preferably 8 μm or more. The thickness of the metal mesh 30 is more preferably 30 μm or less, even more preferably 20 μm or less, and particularly preferably 15 μm or less.

[0034] In the metal mesh 30, the conductor thickness is set smaller than the line widths (conductor widths) w31, w32 of the thin metal wires 31, 32. This is because if the aspect ratio (conductor thickness / conductor width) exceeds 1, the structure becomes unbalanced, prone to breakage, and difficult to manufacture. However, the thicker the conductor, the smaller the sheet resistance value, so the thicker the conductor, the better the radiation efficiency of the slot-type radiating element. For this reason, it is preferable that the conductor thickness be smaller than the conductor width and as large as possible.

[0035] The conductive material of the thin metal wires 31 and 32 of the metal mesh 30 can be copper, but other metal materials such as silver, aluminum, chromium, nickel, gold, platinum, tin, and iron can also be used, and the material is not limited to these.

[0036] Such a metal mesh 30 is transparent, has high light transmittance so that it is difficult for the human eye to see, and can function as a transparent conductor. The surface resistance of the metal mesh 30 is, for example, 5 Ω / sq or less, more preferably 1 Ω / sq or less, and even more preferably around 0.5 Ω / sq.

[0037] <Configuration of Antenna Device 100> Figures 4A, 4B, and 4C are diagrams showing an example of the configuration of antenna device 100. Figure 4A is a plan view, Figure 4B is a diagram showing a cross section taken along the arrow BB in Figure 4A, and Figure 4C is a diagram showing the bottom side of antenna device 100.

[0038] The antenna device 100 includes a transparent substrate 101, a metal layer 110, and a ground layer 120. The transparent substrate 101 is an example of a base. The metal layer 110 has an edge 111, a coplanar waveguide 130, a loop slot antenna 140, and a parasitic slot 150. The loop slot antenna 140 is an example of a slot antenna.

[0039] The transparent substrate 101 has an upper surface 101A and a lower surface 101B. The upper surface 101A is an example of a first main surface, and the lower surface 101B is an example of a second main surface. A metal layer 110 is provided on the upper surface 101A, and a ground layer 120 is provided on the lower surface 101B.

[0040] The transparent substrate 101 is, for example, a foldable flexible substrate made of PET (polyethylene terephthalate resin) or COP (cycloolefin polymer). "Transparent" means that the visible light transmittance is at least 40% or more, preferably 60% or more, more preferably 70% or more, and even more preferably 80% or more. To ensure that the antenna device 100 is colorless and transparent, it is preferable that the visible light transmittance of the transparent substrate 101 is 80% or more. Furthermore, for example, the dielectric constant of the transparent substrate 101 at 28 GHz is 3.2.

[0041] Furthermore, the thickness of the transparent substrate 101 is preferably 25 μm to 400 μm. In this embodiment, as an example, the thickness of the transparent substrate 101 is 100 μm. The transparent substrate 101, on whose upper surface 101A and lower surface 101B the metal layer 110 and the ground layer 120 are respectively provided, generates a parallel plate mode, which is an unwanted transmission mode, particularly when the thickness is λ / 32 or less. Since the antenna device 100 causes radio waves in the parallel plate mode, which do not normally contribute to radiation, to contribute to radiation, the thickness of the transparent substrate 101 is preferably a thickness that makes it easy to generate the parallel plate mode. Here, λ is the length of one wavelength at the resonant frequency of the loop slot antenna 140.

[0042] The metal layer 110 and the ground layer 120 are formed on the upper surface 101A and the lower surface 101B of the transparent substrate 101, respectively. To make the overall structure easier to understand, the metal layer 110 and the ground layer 120 are shown as planar metal foils in Figures 4A to 4C, but the metal layer 110 and the ground layer 120 are actually made of the metal mesh 30 shown in Figure 3. Here, the configurations of the metal layer 110, the ground layer 120, the coplanar waveguide 130, the loop slot antenna 140, and the parasitic slot 150 will be described.

[0043] <Metal layer 110> As an example, the metal layer 110 is formed on approximately half of the upper surface 101A of the transparent substrate 101 on the -Y direction side. The metal layer 110 is rectangular in plan view and has an edge 111 extending in the X direction on the +Y direction side. In order to improve the directional gain and radiation efficiency of the antenna device 100, the edge 111 is located approximately in the center of the Y direction length of the ground layer 120 in plan view and extends in the X direction. In other words, the edge 111 is located midway along the Y direction length of the ground layer 120. Of the four sides of the outer edge of the metal layer 110, the three sides other than the edge 111 are located along the outer edge of the transparent substrate 101. As an example, the length of the metal layer 110 in the X direction is 15 mm and the length in the Y direction is 11.8 mm.

[0044] The metal layer 110 has a coplanar waveguide 130, a loop slot antenna 140, and a parasitic slot 150. The coplanar waveguide 130, the loop slot antenna 140, and the parasitic slot 150 are provided in this order from the −Y direction side to the +Y direction side of the metal layer 110.

[0045] Here, we will describe a configuration in which end edge 111 is located approximately in the center of the Y-direction length of ground layer 120, but the position of end edge 111 in the Y-direction may be further toward the +Y direction or further toward the -Y direction.

[0046] 3 , the thin metal wires 31 and 32 extend in a direction at 45 degrees to the X-axis and Y-axis. In this case, if the thin metal wires 31 and 32 also extend in a direction at 45 degrees to the X-axis and Y-axis at the outer edge of the metal layer 110 on the +Y-direction side, which corresponds to the end edge 111, then the end edge 111 will microscopically have a zigzag shape with respect to the X-axis due to the thin metal wires 31 and 32. In such a case, a virtual straight line extending in the X-direction and tangent to the thin metal wires 31 and 32 located at the outer edge of the metal layer 110 on the +Y-direction side may be treated as the end edge 111.

[0047] Furthermore, for example, by providing a straight thin metal wire parallel to the X-axis on the outer edge of the metal layer 110 on the +Y direction side, the end side 111 may be formed of a straight thin metal wire parallel to the X-axis. In this case, an isosceles triangular opening surrounded by the straight thin metal wire parallel to the X-axis and the thin metal wires 31 and 32 is provided on the end side 111.

[0048] <Ground Layer 120> As an example, the ground layer 120 is formed on substantially the entire lower surface 101B of the transparent substrate 101. The ground layer 120 is provided to prevent radio waves emitted by the antenna device 100 from propagating to the display panel 220 arranged on the -Z direction side of the antenna device 100, and to shield the radio waves generated by the display panel 220 on the antenna device 100 side. Furthermore, by providing the ground layer 120 on the -Z direction side of the transparent substrate 101, the radio waves emitted from the antenna device 100 in the -Z direction can be reflected in the +Z direction.

[0049] The ground layer 120 is provided across a first region 121 that overlaps with the metal layer 110 in a plan view, and a second region 122 that is located on the opposite side of the edge 111 from the first region 121 in a plan view and does not overlap with the metal layer 110. In a plan view, the edge 111 of the metal layer 110 is located at the boundary between the first region 121 and the second region 122. As an example, the length of the ground layer 120 in the X direction is 15 mm, the length of the first region 121 in the Y direction is 11.8 mm, and the length of the second region 122 in the Y direction is 12.2 mm.

[0050] Here, a configuration will be described in which the ground layer 120 is formed on substantially the entire bottom surface 101B of the transparent substrate 101, and the metal layer 110 is formed on approximately half of the top surface 101A of the transparent substrate 101 on the -Y direction side. However, in this embodiment, it is sufficient that the metal layer 110 is smaller than the ground layer 120, the metal layer 110 overlaps the ground layer 120, and the metal layer 110 has an edge 111 in the overlapping portion with the ground layer 120. The positional relationship between the edge 111 and the parasitic slot 150 will be described later.

[0051] The ground layer 120 overlaps the metal layer 110, and both are composed of the metal mesh 30 shown in FIG. 3 . It is preferable that the positions of the thin metal wires 31, 32, and openings 33 of the metal mesh 30 used as the metal layer 110 coincide with the positions of the thin metal wires 31, 32, and openings 33 of the metal mesh 30 used as the ground layer 120. Because the metal layer 110 and the ground layer 120 are overlapped with the transparent substrate 101 sandwiched therebetween, moire patterns will occur if the positions of the thin metal wires 31, 32, and openings 33 are misaligned. As an example, by forming the metal mesh 30 on the upper surface 101A and the lower surface 101B of the transparent substrate 101 using a lithography process that uses the same photomask, the positions of the thin metal wires 31, 32, and openings 33 of the metal mesh 30 on the upper surface 101A and the lower surface 101B can be aligned, suppressing moire patterns and improving appearance.

[0052] <Coplanar Waveguide 130> Coplanar waveguide 130 has line 131 provided between adjacent metal layers 110 on the +X direction side and the −X direction side, and extending in the Y direction. Line 131 has, as an example, end 131A located at the end of metal layer 110 on the −Y direction side and the center of metal layer 110 in the X direction, and end 131B connected to loop slot antenna 140. Coplanar waveguide 130 is realized by such line 131 and metal layers 110 adjacent to line 131 on the +X direction side and the −X direction side. Coplanar waveguide 130 also overlaps with ground layer 120 in a plan view, and therefore constitutes a GCPW (Grounded Coplanar Waveguide).

[0053] Coplanar waveguide 130 has an end 131A connected to a power source and functions as a feed line that feeds power to loop slot antenna 140. The length between ends 131A and 131B of line 131 is, for example, 3.75 mm.

[0054] <Loop slot antenna 140> As an example, the loop slot antenna 140 is a rectangular loop-shaped slot antenna. The loop length of the loop slot antenna 140 is the electrical length λe of the wavelength at the resonant frequency. Here, as an example, a configuration in which the resonant frequency of the loop slot antenna 140 is 28 GHz will be described, but the resonant frequency of the loop slot antenna 140 may be any frequency in the Sub-6 band or the millimeter wave band.

[0055] 4A shows, as an example, a loop slot antenna 140 having a loop length adjusted for 28 GHz, so the length of the loop slot antenna 140 in the X direction is 2.83 mm and the length in the Y direction is 2.55 mm. The lengths in the X and Y directions are the lengths between the centers of the width of the loop slot antenna 140. The width of the loop slot antenna 140 is, as an example, 0.65 mm. The width of the loop slot antenna 140 is the width in the direction perpendicular to the extension direction of the loop slot antenna 140, which extends in a rectangular shape in a plan view.

[0056] Loop slot antenna 140 is realized by connecting four linear slots corresponding to the four sides, and an end portion 131B of line 131 of coplanar waveguide 130 is connected to the center of the length in the X direction of a slot extending in the X direction on the -Y direction side of loop slot antenna 140. Power is fed to loop slot antenna 140 via coplanar waveguide 130. End portion 131B of line 131 is the feed point of loop slot antenna 140. Loop slot antenna 140 is electromagnetically coupled to parasitic slot 150, and power is supplied from loop slot antenna 140 to parasitic slot 150.

[0057] Furthermore, of the four slots of loop slot antenna 140, two slots extending in the X direction extend parallel to edge 111 of metal layer 110. In other words, edge 111 extends parallel to two of the four slots of loop slot antenna 140 that extend in the X direction.

[0058] Furthermore, of the four slots of loop slot antenna 140, two slots extending in the X direction are parallel to parasitic slot 150. Of the four slots of loop slot antenna 140, the two slots extending in the X direction correspond to the sides of loop slot antenna 140 that are parallel to parasitic slot 150. In other words, loop slot antenna 140 has sides that are parallel to parasitic slot 150.

[0059] 4A, the configuration has been described in which the parasitic slot 150 and edge 111 are located on the +Y direction side of the loop slot antenna 140 to which the coplanar waveguide 130 is connected from the -Y direction side. However, the parasitic slot 150 and edge 111 may be located on the +X direction side or the -X direction side of the loop slot antenna 140. In such a case, the positional relationship between the one slot of the four slots of the loop slot antenna 140 that is closest to the parasitic slot 150 and edge 111 and the parasitic slot 150 and edge 111 may be made the same as the positional relationship shown in FIG. 4A.

[0060] Additionally, although a configuration in which the antenna device 100 includes the loop slot antenna 140 will be described here, a slot antenna other than the loop slot antenna 140 may also be used. The slot antenna other than the loop slot antenna 140 may be, for example, a slot dipole antenna extending in the X direction parallel to the parasitic slot 150. The length between both ends of the slot dipole antenna extending in the X direction is, for example, half the electrical length λe of the wavelength at the resonant frequency (λe / 2).

[0061] The slot antenna of the antenna device 100 need only extend along the direction in which the edge 111 of the metal layer 110 extends, and does not have to be strictly parallel to it. Along the extending direction means not only being parallel to the extending direction, but also being offset to the extent that electromagnetic coupling with the parasitic slot 150 is not impaired. The slot antenna other than the loop slot antenna 140 may be, for example, a slot antenna that extends in the X direction but has a shape that is curved with respect to the X direction, in addition to the slot dipole antenna described above.

[0062] <Unpowered Slot 150> Parasitic slot 150 is provided between loop slot antenna 140 and edge 111. Parasitic slot 150 is a linear slot, and extends in the X direction parallel to edge 111. Parasitic slot 150 also extends in the X direction parallel to two of the four slots of loop slot antenna 140 that extend in the X direction.

[0063] The length of the parasitic slot 150 in the X direction is defined as L. As an example, the parasitic slot 150 is formed so that the center of the length L coincides with the center of the X direction lengths of two of the four slots of the loop slot antenna 140 that extend in the X direction. As an example, the length L is 8.43 mm. Furthermore, the width of the parasitic slot 150 in the Y direction is 0.65 mm, as an example, and is equal to the width of the loop slot antenna 140. Note that the width of the parasitic slot 150 in the Y direction does not have to be equal to the width of the loop slot antenna 140, but it is preferable that it is equal.

[0064] Furthermore, the distance between the center of the Y-direction width of the slot extending in the X-direction on the +Y-direction side of the four slots of loop slot antenna 140 and the center of the Y-direction width of parasitic slot 150 is defined as d1. The distance between the center of the Y-direction width of parasitic slot 150 and end edge 111 is defined as d2. Distance d1 is, for example, 2.00 mm, and distance d2 is, for example, 2.42 mm.

[0065] Here, of the four slots of loop slot antenna 140, the slot extending in the X direction on the +Y direction side corresponds to the side of loop slot antenna 140 closest to parasitic slot 150. The ratio of the length L of parasitic slot 150 to the length of the slot corresponding to the side of loop slot antenna 140 closest to parasitic slot 150 is preferably 0.5 to 12. In FIG. 4A , as an example, the length of the slot corresponding to the side of loop slot antenna 140 closest to parasitic slot 150 is 2.55 mm. Note that, for the ratio of 0.5 to 12, the length L of parasitic slot 150 preferably satisfies λe / 8≦L≦3λe, where λe is the electrical length of the wavelength at the resonant frequency of loop slot antenna 140.

[0066] Furthermore, the total distance d of the distances d1 and d2 preferably satisfies λe / 4≦d≦2λe. λe is the electrical length of the wavelength at the resonant frequency of the loop slot antenna 140. Furthermore, it is preferable that the distances d1 and d2 are approximately equal. Furthermore, the distance d is the distance between the loop slot antenna 140 and the edge 111, which are arranged on either side of the parasitic slot 150. When the lengths of the loop slot antenna 140, the parasitic slot 150, and the edge 111 are each n / 2 times λe / 4 (n is an integer greater than or equal to 1), and when the distances d1 and d2 are n / 2 times λe / 4, the resonance condition is satisfied, and strong electromagnetic field coupling between the loop slot antenna 140 and the parasitic slot 150 and between the parasitic slot 150 and the edge 111 is obtained. In particular, since n is preferably in the range of 1 to 8, it is preferable that the distance d satisfies λe / 4≦d≦2λe.

[0067] Furthermore, the length L of the parasitic slot 150 preferably satisfies λe / 8≦L≦3λe, more preferably is λe or more, and further preferably is 1.5λe or more.

[0068] When the antenna device 100 configured as above is disposed on the display surface side of the display panel 220, the transparent substrate 101 is used and the metal layer 110 and the ground layer 120 are made of the metal mesh 30.

[0069] In this case, the ground layer 120 is provided between the antenna device 100 and the display panel 220 to block radio waves and noise in both directions, and is therefore provided over the entire lower surface 101B of the transparent substrate 101.

[0070] Furthermore, metal layer 110 provided on the +Z direction side of transparent substrate 101 is disposed directly behind transparent cover 240 of electronic device 200, and is therefore easily visible from the outside. In such a case, it may be possible to omit metal layers 110 on the +X direction side and the −X direction side of line 131, and use a microstrip line realized by line 131 and ground layer 120 as a feed line instead of coplanar waveguide 130. It may also be possible to omit metal layer 110 around loop slot antenna 140 by using a patch antenna or the like instead of loop slot antenna 140.

[0071] However, when a microstrip line is used as a feed line instead of the coplanar waveguide 130, or when a patch antenna or the like is used instead of the loop slot antenna 140, the area of ​​the metal mesh 30 becomes smaller. Then, on the upper surface 101A of the transparent substrate 101, a difference in visible light transmittance occurs between the area where the metal mesh 30 is present and the area where the metal mesh 30 is not present, resulting in unevenness.

[0072] For these reasons, there is a demand for disposing the metal mesh 30 over a wider area on the upper surface 101A of the transparent substrate 101 in order to suppress unevenness due to differences in visible light transmittance, particularly when the metal mesh 30 is disposed on the display surface side of the display panel 220. To meet this demand, the coplanar waveguide 130 and the loop slot antenna 140 are adopted.

[0073] <Parallel plate mode electric field> Next, we will explain the electric field in the quasi-TEM mode of the radio waves propagating through the coplanar waveguide 130 and the electric field in the parallel plate mode generated within the transparent substrate 101. When power is fed to the end 131A of the line 131 of the coplanar waveguide 130, the coplanar waveguide 130 generates an electric field in the quasi-TEM mode.

[0074] Furthermore, since metal layer 110 having coplanar waveguide 130 is provided on upper surface 101A of transparent substrate 101 and ground layer 120 is provided on lower surface 101B, an electric field in a parallel plate mode is generated within transparent substrate 101 between metal layer 110 and ground layer 120. The thinner the transparent substrate 101 is, the more pronounced the electric field in the parallel plate mode is. Here, the electric field generated within transparent substrate 101 will be described with reference to FIGS. 5A, 5B, and 5C.

[0075] FIG. 5A is an enlarged cross-sectional view of the line 131 in the cross section taken along the C1-C1 arrow in FIG. 4A. The C1-C1 cross section is included in the section in the Y direction where the coplanar waveguide 130 is located. FIG. 5B is an enlarged cross-sectional view of the loop slot antenna 140 in the cross section taken along the C2-C2 arrow in FIG. 4A. The C2-C2 cross section is included in the section in the Y direction where the loop slot antenna 140 is located. FIG. 5C is a diagram showing the cross section taken along the BB arrow in FIG. 4A. In FIG. 5C, the loop slot antenna 140 and the parasitic slot 150 are shown in an exaggerated manner.

[0076] In Figure 5A, the solid arrows indicate the electric field of the quasi-TEM mode generated by the coplanar waveguide 130 at a certain moment. The electric field of the quasi-TEM mode is generated in the +Z direction of the line 131, between the line 131 and the metal layers 110 on both sides in the X direction, and between the line 131 and the ground layer 120. At a moment that is 180 degrees out of phase with the moment shown in Figure 5A, the direction of the solid arrows representing the electric field of the quasi-TEM mode is reversed.

[0077] 5A also shows, with dashed arrows, the electric field of the parallel plate mode that occurs at a certain moment between metal layer 110 having coplanar waveguide 130 and ground layer 120. The electric field of the parallel plate mode is an unwanted mode that does not contribute to the transmission of radio waves through coplanar waveguide 130. At a moment when the phase is 180 degrees different from the moment shown in FIG. 5A, the direction of the dashed arrow representing the electric field of the parallel plate mode is reversed.

[0078] 5A, in addition to the quasi-TEM mode electric field (solid line), a parallel plate mode electric field (dashed line) is generated between coplanar waveguide 130 and ground layer 120. Therefore, the quasi-TEM mode electric field propagated to loop slot antenna 140 by coplanar waveguide 130 is reduced by the amount of the parallel plate mode electric field (dashed line). In addition, the parallel plate mode radio wave propagates inside transparent substrate 101 toward loop slot antenna 140.

[0079] 5B, the solid arrows indicate the electric field generated in the loop slot antenna 140 sandwiched between the metal layers 110 on the inner and outer sides of the loop slot antenna 140 at a certain moment. Furthermore, since the parallel plate mode radio waves propagate inside the transparent substrate 101 toward the loop slot antenna 140, as shown in FIG. 5B, an electric field (dashed line) in the parallel plate mode is also generated in the cross section including the loop slot antenna 140. At a moment when the phase is 180 degrees different from the moment shown in FIG. 5A, the arrows (solid lines) indicating the direction of the electric field generated in the loop slot antenna 140 are reversed, and the arrows (dashed lines) indicating the direction of the electric field in the parallel plate mode are also reversed.

[0080] <Reason for providing the edge 111 and the parasitic slot 150> 5B, in the cross section including the loop slot antenna 140, in addition to the electric field generated in the loop slot antenna 140, an electric field in the parallel plate mode is generated inside the transparent substrate 101. Therefore, the electric field generated in the loop slot antenna 140 is reduced by the amount of the electric field in the parallel plate mode (dashed line).

[0081] If the antenna device 100 did not include the parasitic slot 150 and the edge 111 of the metal layer 110 were positioned at the end of the transparent substrate 101 on the +Y direction side rather than at the position shown in Figures 4A and 4B, the parallel plate mode radio waves would propagate through the inside of the transparent substrate 101 to the end on the +Y direction side.

[0082] 5C , antenna device 100 is improved so that radio waves in the parallel plate mode contribute to the radiation of radio waves from antenna device 100 by making metal layer 110 smaller than ground layer 120, locating edge 111 at the midpoint of the length of ground layer 120 in the Y direction, and providing parasitic slot 150 between edge 111 and loop slot antenna 140.

[0083] In Figure 5C, the electric field of the parallel plate mode at a certain moment is shown by a dashed arrow. The length of the arrow indicates the strength of the electric field, with the longer the arrow, the stronger the electric field. Note that at a moment when the phase is 180 degrees different from that shown in Figure 5C, the arrow (dashed line) representing the direction of the electric field of the parallel plate mode is in the opposite direction.

[0084] When radio waves in the parallel plate mode propagate inside the transparent substrate 101 from the -Y direction side to the +Y direction side, since there is no metal layer 110 on the upper surface 101A of the transparent substrate 101 on the +Y direction side of the edge 111, the electric field of the unwanted transmission mode is released to the +Z direction side of the transparent substrate 101 beyond the edge 111.

[0085] At this time, due to electromagnetic field coupling between loop slot antenna 140, parasitic slot 150, and edge 111, the electric field becomes particularly strong immediately before edge 111 in the propagation direction of the parallel plate mode radio waves (+Y direction in FIG. 5C ). Therefore, on the +Y direction side of edge 111, the electric field of the parallel plate mode radio waves radiated in the +Z direction becomes stronger the closer to edge 111. On the +Y direction side of edge 111, the parallel plate mode radio waves radiated in the +Z direction contribute to the radio waves radiated in the +Z direction from antenna device 100. For this reason, by providing edge 111 closer to the front than the end of ground layer 120 on the +Y direction side and utilizing electromagnetic field coupling between loop slot antenna 140, parasitic slot 150, and edge 111, the gain of the radio waves radiated by antenna device 100 can be increased.

[0086] By making the metal layer 110 smaller than the ground layer 120, the brightness of the antenna device 100 differs between the first region 121 and the second region 122 of the ground layer 120 depending on whether or not the metal layer 110 is present. However, the brightness of the antenna device 100 differs across the edge 111, which extends linearly parallel to the X direction at the center in the Y direction of the transparent substrate 101, and since there is only one linear boundary of brightness, it is possible to make it less likely for unevenness to occur.

[0087] Furthermore, in this embodiment, the edge 111 is located approximately in the center of the length of the ground layer 120 in the Y direction in a plan view. However, as long as the directional gain and radiation efficiency of the antenna device 100 can be improved, the edge 111 may be located so as to overlap with an edge extending in the X direction on the +Y direction side of the ground layer 120. In this case, the sizes of the metal layer 110 and the ground layer 120 in a plan view are the same, and the positions of all four sides coincide with each other.

[0088] <Simulation results> 6 is a diagram showing an example of simulation results for the antenna device 100, the modified antenna device, and comparative antenna devices 1 and 2. Here, the results of calculating the directional gain and radiation efficiency as antenna characteristics will be described. The modified antenna device has a configuration in which part of the antenna device 100 is modified, and is an antenna device that is a modification of the embodiment.

[0089] The comparative antenna device 1 has a configuration in which the parasitic slot 150 is omitted from the antenna device 100 and the edge 111 is moved to the end of the transparent substrate 101 in the +Y direction. In the comparative antenna device 1, the metal layer 110 is provided over the entire upper surface 101A of the transparent substrate 101. In this case, the edge 111 does not exist in the central portion of the upper surface 101A of the transparent substrate 101, and therefore is indicated as "no edge" in FIG. 6.

[0090] The comparative antenna device 2 has a configuration in which the parasitic slot 150 is omitted from the antenna device 100. That is, the position of the edge 111 of the comparative antenna device 2 is the same as that of the antenna device 100, and the size of the metal layer 110 is also the same as that of the antenna device 100, but the metal layer 110 does not have the parasitic slot 150. Because the position of the edge 111 is the same as that of the antenna device 100, it is described as having an edge.

[0091] The antenna device of the modified example is an antenna device obtained by modifying the antenna device 100 to have a configuration without an edge. That is, the antenna device of the modified example includes a parasitic slot 150, the edge 111 is moved to the end of the transparent substrate 101 in the +Y direction, and the metal layer 110 is provided over the entire upper surface 101A of the transparent substrate 101. In a plan view, the size of the metal layer 110 is equal to the size of the ground layer 120, and the metal layer 110 and the ground layer 120 are aligned and overlapped.

[0092] The antenna device 100 is described as having a parasitic slot and an edge.

[0093] Simulations were performed to calculate the directional gain and radiation efficiency as antenna characteristics for the comparative antenna devices 1 and 2, the modified antenna device, and the antenna device 100. The directional gain (dBi) represents the three-dimensional maximum value of the gain of radio waves radiated in the +Z direction from each antenna device.

[0094] The simulation conditions are as follows: The length between the ends 131A and 131B of the line 131 is 3.75 mm. The length of the loop slot antenna 140 in the X direction is 2.83 mm, and the length in the Y direction is 2.55 mm. The width of the loop slot antenna 140 is 0.65 mm. When a parasitic slot is present, the length L of the parasitic slot 150 is 8.43 mm, and the width is 0.65 mm. When a parasitic slot is present, the distance d1 is, for example, 2.00 mm, and the distance d2 is, for example, 2.42 mm. When an edge is present, the length of the metal layer 110 in the X direction is 15 mm, the length in the Y direction is 11.8 mm, the length of the ground layer 120 in the X direction is 15 mm, and the length of the second region 122 in the Y direction is 12.2 mm. Without edges, the metal layer 110 has a length of 15 mm in the X direction and a length of 24.0 mm in the Y direction, and the lengths of the ground layer 120 in the X and Y directions are the same as those of the metal layer 110, respectively.

[0095] As shown in Figure 6, the directional gain of the comparative antenna device 1 was 5.67 dBi, that of the comparative antenna device 2 was 5.94 dBi, that of the antenna device of the modified example was 5.93 dBi, and that of the antenna device 100 was 9.28 dBi. The directional gain of the comparative antenna device 1 was the lowest, and the directional gains of the comparative antenna device 2 and the antenna device of the modified example were approximately equal, but the directional gain of the comparative antenna device 1 was approximately 0.3 dB higher. This is thought to be the effect of providing the parasitic slot 150. The directional gain of the antenna device 100 was 3.3 dB or more higher than the directional gains of the comparative antenna device 2 and the antenna device of the modified example.

[0096] Furthermore, the radiation efficiency was -5.77 dB for comparative antenna device 1, -4.75 dB for comparative antenna device 2, -4.04 dB for the modified antenna device, and -3.97 dB for antenna device 100. Compared to the radiation efficiency of comparative antenna devices 1 and 2 (without parasitic slot), the radiation efficiency of the modified antenna device (with parasitic slot) and antenna device 100 (with parasitic slot) was improved by approximately 0.7 dB or more, which suggests that the electromagnetic field coupling between loop slot antenna 140 and parasitic slot 150 was effective in improving the radiation efficiency. Furthermore, the radiation efficiency of the modified antenna device and antenna device 100 were approximately the same value.

[0097] From the above, it was confirmed that the directional gain value of the antenna device of the modified example was approximately 0.3 dB higher than that of the comparative antenna device 1, and therefore the directional gain was improved by providing the parasitic slot 150 between the loop slot antenna 140 and the edge 111. The directional gain of the antenna device 100 was 3.3 dB or more higher than that of the antenna device of the modified example, and therefore it was confirmed that the directional gain was improved by providing the edge 111 midway along the length of the ground layer 120 in the Y direction.

[0098] Furthermore, since the directional gain of the modified antenna device and the directional gain of the comparative antenna device 2 were equivalent in value, it was confirmed that the effects of adding a parasitic slot 150 to the comparative antenna device 1 and changing the comparative antenna device 1 to a configuration with an edge were approximately the same.

[0099] Furthermore, with regard to radiation efficiency, the radiation efficiency of the modified antenna device (with parasitic slot) and antenna device 100 (with parasitic slot) was approximately 0.7 dB higher than the radiation efficiency of the comparative antenna devices 1 and 2 (without parasitic slot), confirming that the radiation efficiency is improved by electromagnetic field coupling between the parasitic slot 150 and the loop slot antenna 140.

[0100] Through the above simulation, it was confirmed that the antenna device 100 and the antenna device of the modified example can improve the directional gain and radiation efficiency as antenna characteristics.

[0101] <Effects> The antenna device 100 includes a base (e.g., a transparent substrate 101) having an upper surface 101A and a lower surface 101B, a metal layer 110 provided on the upper surface 101A, and a ground layer 120 provided on the lower surface 101B at a position overlapping the metal layer 110 in a planar view. The metal layer 110 includes a coplanar waveguide 130, a slot antenna (e.g., a loop slot antenna 140) connected to the coplanar waveguide 130, an edge 111 extending along the extension direction of the slot antenna, and a parasitic slot 150 provided between the loop slot antenna and the edge 111. In this way, providing the parasitic slot 150 between the slot antenna (e.g., the loop slot antenna 140) and the edge 111 improves directional gain, and electromagnetic field coupling between the parasitic slot 150 and the slot antenna improves radiation efficiency. The directional gain and radiation efficiency are antenna characteristics.

[0102] Therefore, it is possible to provide the antenna device 100 with improved antenna characteristics.

[0103] The ground layer 120 is provided across a first region 121 that overlaps with the metal layer 110 and a second region 122 that is located on the opposite side of the edge 111 from the first region 121 and does not overlap with the metal layer 110.

[0104] By making the metal layer 110 smaller than the ground layer 120, positioning the edge 111 midway along the Y-direction length of the ground layer 120, and providing a parasitic slot 150 between the edge 111 and the loop slot antenna 140, it is possible to improve the contribution of parallel plate mode radio waves to the radiation of radio waves by the antenna device 100.

[0105] Therefore, it is possible to provide the antenna device 100 with further improved antenna characteristics. With this configuration, it is possible to particularly improve the directional gain among the antenna characteristics.

[0106] Furthermore, the ratio of the length of the parasitic slot 150 to the length of the side of the slot antenna (for example, loop slot antenna 140) closest to the parasitic slot 150 is 0.5 to 12, so sufficient electromagnetic field coupling is obtained between the slot antenna and the parasitic slot 150, improving the antenna characteristics.

[0107] The total distance d of the distance d1 (an example of a first distance) between the slot antenna (for example, loop slot antenna 140) and the parasitic slot 150 and the distance d2 (an example of a second distance) between the parasitic slot 150 and the edge 111 satisfies λe / 4≦d≦2λe, where λe is the electrical length of the wavelength at the resonant frequency of the slot antenna. Therefore, by adjusting the distances d1 and d2, it is possible to optimize the electromagnetic field coupling between the slot antenna and the parasitic slot 150 and the electromagnetic field coupling between the parasitic slot 150 and the edge 111, thereby improving the antenna characteristics.

[0108] Furthermore, when the electrical length of the wavelength at the resonant frequency of the slot antenna (for example, loop slot antenna 140) is λe, the length L of parasitic slot 150 satisfies λe / 8≦L≦3λe. Therefore, by adjusting length L of parasitic slot 150, it is possible to optimize the electromagnetic field coupling between the slot antenna and parasitic slot 150 and the electromagnetic field coupling between parasitic slot 150 and edge 111, thereby improving the antenna characteristics.

[0109] Furthermore, since the slot antenna (for example, loop slot antenna 140) has a side parallel to parasitic slot 150, good electromagnetic field coupling between the slot antenna and parasitic slot 150 can be obtained, improving the antenna characteristics.

[0110] Since the parasitic slot 150 is parallel to the edge 111, good electromagnetic field coupling can be achieved between the parasitic slot 150 and the edge 111, thereby improving the antenna characteristics.

[0111] Furthermore, since the base (for example, the transparent substrate 101) is transparent and the metal layer 110 and the ground layer 120 are formed of the metal mesh 30, it is possible to provide the antenna device 100 with improved antenna characteristics while suppressing unevenness due to differences in visible light transmittance. In particular, when the antenna device 100 is disposed on the display surface side of the display panel 220, the metal mesh 30 is disposed over a wider area on the upper surface 101A of the transparent substrate 101 in order to suppress unevenness due to differences in visible light transmittance, and therefore, being able to suppress unevenness due to differences in visible light transmittance is very significant from the perspective of improving the appearance.

[0112] Furthermore, since the thickness of the base (for example, the transparent substrate 101) is 25 μm to 400 μm, it is possible to provide an antenna device 100 with improved antenna characteristics in a configuration in which the parallel plate mode is likely to occur due to the thin transparent substrate 101.

[0113] Since the resonant frequency of the slot antenna (for example, the loop slot antenna 140) is in the Sub-6 band or the millimeter wave band, it is possible to provide an antenna device 100 with improved antenna characteristics for emitting radio waves in the Sub-6 band or the millimeter wave band.

[0114] Since the slot antenna is a loop slot antenna 140, it is possible to provide an antenna device 100 with further improved antenna characteristics.

[0115] Furthermore, the display module D includes the antenna device 100 and a display panel 220 having a display surface that is placed on the side of the ground layer 120 of the antenna device 100. Therefore, it is possible to provide a display module D that includes the antenna device 100 with improved antenna characteristics.

[0116] The above describes exemplary antenna devices and antenna-equipped display devices of the present disclosure, but the present disclosure is not limited to the specifically disclosed embodiments, and various modifications and variations are possible without departing from the scope of the claims.

[0117] The following additional notes are provided regarding the above-described embodiments. (Appendix 1) a substrate having a first major surface and a second major surface; a metal layer provided on the first main surface; a ground layer provided on the second main surface at a position overlapping the metal layer in a plan view; Including, The metal layer is a coplanar waveguide; a slot antenna connected to the coplanar waveguide; an end edge extending along the extending direction of the slot antenna; a parasitic slot provided between the slot antenna and the end edge; An antenna device comprising: (Appendix 2) The antenna device described in Appendix 1, wherein the ground layer is provided across a first region that overlaps with the metal layer and a second region that is located on the opposite side of the edge from the first region and does not overlap with the metal layer. (Appendix 3) 3. The antenna device according to claim 1, wherein a ratio of the length of the parasitic slot to the length of the side of the slot antenna that is closest to the parasitic slot is 0.5 to 12. (Appendix 4) The antenna device according to any one of appendixes 1 to 3, wherein a total distance d of a first distance between the slot antenna and the parasitic slot and a second distance between the parasitic slot and the edge satisfies λe / 4≦d≦2λe, where λe is the electrical length of a wavelength at a resonant frequency of the slot antenna. (Appendix 5) An antenna device according to any one of appendices 1 to 4, wherein the length L of the parasitic slot satisfies λe / 8≦L≦3λe, where λe is the electrical length of the wavelength at the resonant frequency of the slot antenna. (Appendix 6) 5. The antenna device according to claim 1, wherein the slot antenna has a side parallel to the parasitic slot. (Appendix 7) 7. The antenna device according to claim 1, wherein the parasitic slot is parallel to the end edge. (Appendix 8) the substrate is transparent; 8. The antenna device according to claim 1, wherein the metal layer and the ground layer are formed of a metal mesh. (Appendix 9) 9. The antenna device according to any one of claims 1 to 8, wherein the thickness of the base is 25 μm to 400 μm. (Appendix 10) 10. The antenna device according to claim 1, wherein the resonant frequency of the slot antenna is in the Sub-6 band or the millimeter wave band. (Appendix 11) 11. The antenna device according to claim 1, wherein the slot antenna is a loop slot antenna. (Appendix 12) An antenna device according to any one of Supplementary Notes 1 to 11; a display device having a display surface arranged on the ground layer side of the antenna device; A display device with an antenna, comprising: [Explanation of symbols]

[0118] 110 Metal layer 111 Edge 120 Ground Layer 121 1st area 122 Second area 130 Coplanar Waveguide 131 Railroad 140 Loop slot antenna (an example of a slot antenna) 150 Unpowered Slots 200 Electronic equipment 220 Display panel (an example of a display device)

Claims

1. a substrate having a first major surface and a second major surface; a metal layer provided on the first main surface; a ground layer provided on the second main surface at a position overlapping the metal layer in a plan view; Including, The metal layer is a coplanar waveguide; a slot antenna connected to the coplanar waveguide; an end edge extending along the extending direction of the slot antenna; a parasitic slot provided between the slot antenna and the end edge; An antenna device comprising:

2. 2. The antenna device according to claim 1, wherein the ground layer is provided across a first region that overlaps with the metal layer and a second region that is located on the opposite side of the edge from the first region and does not overlap with the metal layer.

3. 2. The antenna device according to claim 1, wherein a ratio of a length of the parasitic slot to a length of a side of the slot antenna that is closest to the parasitic slot is 0.5 to 12.

4. 2. The antenna device according to claim 1, wherein a total distance d of a first distance between the slot antenna and the parasitic slot and a second distance between the parasitic slot and the end edge satisfies λe / 4≦d≦2λe, where λe is the electrical length of a wavelength at a resonant frequency of the slot antenna.

5. 2. The antenna device according to claim 1, wherein a length L of the parasitic slot satisfies λe / 8≦L≦3λe, where λe is the electrical length of a wavelength at a resonant frequency of the slot antenna.

6. The antenna device according to claim 1 , wherein the slot antenna has a side parallel to the parasitic slot.

7. The antenna device according to claim 1 , wherein the parasitic slot is parallel to the end side.

8. the substrate is transparent; The antenna device according to claim 1 , wherein the metal layer and the ground layer are formed of a metal mesh.

9. 2. The antenna device according to claim 1, wherein the thickness of the substrate is 25 μm to 400 μm.

10. 2. The antenna device according to claim 1, wherein the resonant frequency of the slot antenna is in the Sub-6 band or the millimeter wave band.

11. The antenna device according to claim 1 , wherein the slot antenna is a loop slot antenna.

12. The antenna device according to claim 1; a display device having a display surface arranged on the ground layer side of the antenna device; A display device with an antenna, comprising:

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