Transparent antenna

Abstract

The utility model relates to the technical field of wireless communication, in particular to a transparent antenna, which comprises a protective layer, a first transparent antenna layer, a second transparent antenna layer and a flexible printed circuit, and is characterized in that the first transparent antenna layer comprises a plurality of first antenna bodies arranged along a first direction; the first transparent antenna layer comprises a plurality of first antenna bodies arranged in the first direction, the second transparent antenna layer comprises a plurality of second antenna bodies arranged in the second direction, at least one end of each first antenna body is provided with a first pin, at least one end of each second antenna body is provided with a second pin, the first antenna bodies are directly and electrically connected with the flexible printed circuit through the first pins, and the second antenna bodies are electrically connected with the flexible printed circuit through the second pins. And the second antenna body is directly and electrically connected with the flexible printed circuit through the second pin. According to the transparent antenna provided by the invention, the pins are arranged at the end part of the antenna body, and the pins are connected with the flexible printed circuit, so that the impedance at the joint of the antenna body and the external detection circuit and the overall impedance of the transparent antenna are reduced.

Description

[Technical Field]

[0001] This application relates to the field of wireless communication technology, and in particular to a transparent antenna. [Background Technology]

[0002] Optically transparent antennas are antennas fabricated using specific optically transparent conductive materials, achieving a transparent appearance. Current transparent antenna structures used in electromagnetic touchscreens or capacitive touchscreens primarily involve forming a transparent conductive layer on the surface of a dielectric substrate. To connect the transparent conductive layer to the detection circuit, a narrow bezel area is typically created around the dielectric substrate. Within this narrow bezel area, a dense grid of silver nanomaterial conductive connectors is placed to link the conductive layer and the detection circuit. The dense grid of conductive connectors within the narrow bezel area exhibits high impedance, sometimes even higher than the impedance of the transparent conductive layer, thus increasing the overall impedance of the transparent antenna structure.

[0003] Therefore, a new transparent antenna is needed to solve the problem of high impedance caused by the narrow bezel wiring. [Utility Model Content]

[0004] To address the issue of high impedance caused by the narrow bezel wiring, this application provides a novel transparent antenna.

[0005] A transparent antenna includes a protective layer, a first transparent antenna layer, a second transparent antenna layer, and a flexible printed circuit. The first transparent antenna layer includes a plurality of first antenna bodies arranged along a first direction, and the second transparent antenna layer includes a plurality of second antenna bodies arranged along a second direction. At least one end of each of the first antenna bodies is provided with a first pin, and at least one end of each of the second antenna bodies is provided with a second pin. The first antenna body is directly electrically connected to the flexible printed circuit through the first pin, and the second antenna body is directly electrically connected to the flexible printed circuit through the second pin.

[0006] Furthermore, the flexible printed circuit includes a first flexible printed circuit and a second flexible printed circuit. The first flexible printed circuit is electrically connected to the first transparent antenna body through the first pin, and the second flexible printed circuit is electrically connected to the second transparent antenna body through the second pin.

[0007] Furthermore, the protective layer is a transparent material, or the protective layer is glass.

[0008] Furthermore, the first transparent antenna layer includes a first transparent dielectric layer and a first transparent antenna body disposed on the first transparent dielectric layer, and the second transparent antenna layer includes a second transparent dielectric layer and a second transparent antenna body disposed on the second transparent dielectric layer.

[0009] Furthermore, the first transparent antenna body is made of silver nanomaterial, the second transparent antenna body is made of silver nanomaterial, and the first pin and the second pin are made of silver nanomaterial.

[0010] Furthermore, the first transparent dielectric layer is a polyethylene terephthalate film material, and the second transparent dielectric layer is a polyethylene terephthalate film material.

[0011] Furthermore, the first transparent antenna layer and the second transparent antenna layer are bonded together with optical adhesive, and the first antenna body and the second antenna body are perpendicular to each other to form a grid, and the first antenna body and the second antenna body do not contact each other.

[0012] Furthermore, the protective layer is provided with a shielding edge, which divides the transparent antenna into a visible area and a non-visible area.

[0013] Furthermore, the first transparent antenna body and the second transparent antenna body are located in the visible area, and the first pin and the second pin are located in the non-visible area.

[0014] Furthermore, the flexible printed circuit is located in the non-visible area.

[0015] Compared with existing technologies, the transparent antenna provided in this application embodiment, by setting pins at the ends of the antenna body and connecting the pins to the flexible printed circuit, replaces the dense grid-like conductive connectors with a flexible printed circuit board. The impedance of the flexible printed circuit is lower than the state impedance of the dense grid-like conductive connectors in the narrow frame area, reducing the impedance at the connection between the antenna body and the external detection circuit, as well as the overall impedance of the transparent antenna. Under the same usage conditions, the driving power of the transparent antenna can be reduced, the electromagnetic handwriting sensitivity can be improved, and the signal-to-noise ratio can be increased. By setting identical pins at both ends of each antenna body, the output impedance of each antenna body is essentially the same, improving the linearity of electromagnetic handwriting or capacitive touch control. The transparent antenna provided in this application embodiment is simple and reliable. [Attached Image Description]

[0016] Figure 1 This is a schematic diagram of the structure of a transparent antenna provided in this application.

[0017] Figure 2 This is a schematic diagram of the structure of the first transparent antenna layer.

[0018] Figure 3 This is a schematic diagram of the structure of the second transparent antenna layer.

[0019] Figure 4 yes Figure 1 The top view of the transparent antenna shown.

[0020] Figure 5 yes Figure 1 The image shows a bottom view of the transparent antenna.

Detailed Implementation Methods

[0021] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] Please see Figure 1 , Figure 1 This is a side view of a transparent antenna 10 provided in this application. The transparent antenna 10 provided in this application includes a protective layer 11, a first transparent antenna layer 13, a second transparent antenna layer 14, and a flexible printed circuit 15. The protective layer 11 and the first transparent antenna layer 13 are bonded together with an optical adhesive layer 12, and the first transparent antenna layer 13 and the second transparent antenna layer 14 are bonded together with an optical adhesive layer 12. The flexible printed circuit 15 is directly electrically connected to the first transparent antenna layer 13, and the flexible printed circuit 15 is directly electrically connected to the second transparent antenna layer 14.

[0023] The flexible printed circuit 15 includes a first flexible printed circuit 15a and a second flexible printed circuit 15b. The first flexible printed circuit 15a is electrically connected to the surface of the first transparent antenna layer 13 facing the protective layer 11, and the second flexible printed circuit 15b is electrically connected to the surface of the second transparent antenna layer 14 facing the first transparent antenna layer 13.

[0024] In this embodiment, the protective layer 11 is glass, but it can also be other transparent materials, such as polymethyl methacrylate (PMMA).

[0025] The first transparent antenna layer 13 includes a first transparent dielectric layer 131 and a first transparent antenna body 132 disposed on the first transparent dielectric layer 131 and arranged along a first direction. The second transparent antenna layer 14 includes a second transparent dielectric layer 141 and a second transparent antenna body 142 disposed on the second transparent dielectric layer 141 and arranged along a second direction. In this embodiment, the first transparent dielectric layer 131 and the second transparent dielectric layer 141 are PET film materials. In other embodiments, the first transparent dielectric layer 131 and the second transparent dielectric layer 141 include, but are not limited to, transparent dielectric materials such as transparent glass substrate, polyimide (PI), cyclic olefin polymer (COP / COC), and transparent ceramic substrate.

[0026] Please see Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the first transparent antenna layer 13. Figure 3 This is a schematic diagram of the structure of the second transparent antenna layer 14. The first antenna body 132 is a linear structure, and there are multiple of them. A first spacing region 133 is provided between every two first antenna bodies 132. There are multiple first spacing regions 133, and the multiple first antenna bodies 132 are arranged at equal intervals through the multiple first spacing regions 133. At least one end of each first antenna body 132 is provided with a first pin 161. The number of first pins 161 is the same as the number of first antenna bodies 132. The first pin 161 is located on the side of one end of the first antenna body 132 and is located at the midpoint of the side. The first pin 161 is connected to the flexible printed circuit 15.

[0027] The second antenna body 142 is a linear structure, and there are multiple such bodies. A second spacing region 143 is provided between every two second antenna bodies 142. The multiple second spacing regions 143 are arranged at equal intervals through the multiple second spacing regions 143. At least one end of each second antenna body 142 is provided with a second pin 162. The number of second pins 162 is the same as the number of second antenna bodies 142. The second pin 162 is located on the side of one end of the second antenna body 142, and at the midpoint of the side. The second pin 162 is connected to the flexible printed circuit 15. The second pin 162 may be the same as or different from the first pin 161. For example, the second pin 162 may be the same as the first pin 161 in terms of material, length, thickness, etc., or it may be different from the first pin 161 in any aspect.

[0028] In this embodiment, the first antenna body 132 has first pins 161 at both ends. The first pins 161 are located at the midpoint of the side edges of both ends of the first antenna body 132. The number of first pins 161 at each end is the same as the number of first antenna bodies 132. Each first pin 161 at each end is connected to a first flexible printed circuit 15a. The second antenna body 142 has second pins 162 at both ends. The second pins 162 are located at the midpoint of the side edges of both ends of the second antenna body 142. The number of second pins 162 at each end is the same as the number of second antenna bodies 142. Each second pin 162 at each end is connected to a second flexible printed circuit 15b.

[0029] In this embodiment, the first antenna body 132 and the second antenna body 142 are silver nanowires. In other embodiments, the first antenna body 132 and the second antenna body 142 are made of conductive materials, including but not limited to ITO (indium tin oxide), metal thin layers, metal nanowires, graphene films, conductive polymers, etc.

[0030] In this embodiment, the first pin 161 and the second pin 162 are silver nanowires.

[0031] In this embodiment, the base material of both the first flexible printed circuit 15a and the second flexible printed circuit 15b is FPC. The FPC has a circuit cable 151 and a gold finger 152. One end of the circuit cable 151 is connected to the first pin 161 or the second pin 162 by thermoforming, and the other end of the circuit cable 151 is connected to the gold finger 152. In other embodiments, the base material of the flexible printed circuit 15 can be a PCB, or equivalent solid metal lines can be provided at the edges of the first transparent antenna layer 13 and the second transparent antenna layer 14 to replace the flexible printed circuit 15 and connect it to the first pin 161 or the second pin 162.

[0032] In one embodiment, the first transparent antenna layer 13 and the second transparent antenna layer 14 are not provided with the first pin 161 and the second pin 162, and the first antenna body 132 and the second antenna body 142 are directly connected to the circuit cable 151 on the flexible printed circuit 15.

[0033] Please see Figure 4 , Figure 4 yes Figure 1 The image shows a top view of the transparent antenna 10. The protective layer 11 of the transparent antenna 10 has a shielding edge facing the first transparent antenna layer 13, which divides the transparent antenna into a visible area 112 and a non-visible area 111.

[0034] Please see Figure 5 , Figure 5This is a bottom view of a transparent antenna 10 provided in this application. After the first transparent antenna layer 13 and the second transparent antenna layer 14 are bonded together with optical adhesive 12, the first antenna body 132 and the second antenna body 142 are perpendicular to each other and form a grid pattern, without contacting each other. The first antenna body 132 and the second antenna body 142 are located in the visible area 112, and the first pin 161, the second pin 162, and the FPC are located in the non-visible area 111. In this embodiment, the pins at both ends of the first transparent antenna body 132 and the FPC connected to the pin 16 are located in the non-visible areas 111 at the left and right ends of the transparent antenna 10, and the pins at both ends of the second transparent antenna body 142 and the FPC connected to the first pin 161 and the second pin 162 are located in the non-visible areas 111 at the top and bottom ends of the transparent antenna 10.

[0035] The aforementioned transparent antenna can be applied to smart electronic devices, such as mobile phones and smart tablets, on screens that require transparent antennas to achieve electromagnetic handwriting or capacitive touch functions.

[0036] Compared with existing technologies, the transparent antenna provided in this application, by setting pins at the ends of the antenna body and connecting the pins to the flexible printed circuit board, replaces the dense grid-like conductive connectors with a flexible printed circuit board. The impedance of the flexible printed circuit board is lower than the state impedance of the dense grid-like conductive connectors in the narrow bezel area, reducing the impedance at the connection between the antenna body and the external detection circuit, as well as the overall impedance of the transparent antenna. Under the same operating conditions, the driving power of the transparent antenna can be reduced, the electromagnetic handwriting sensitivity can be improved, and the signal-to-noise ratio can be increased. By setting the same pins at both ends of each antenna body, the output impedance of each antenna body is basically the same, improving the linearity of electromagnetic handwriting or capacitive touch. The transparent antenna provided in this application is simple and reliable.

[0037] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A transparent antenna, characterized in that, The device includes a protective layer, a first transparent antenna layer, a second transparent antenna layer, and a flexible printed circuit. The first transparent antenna layer includes a plurality of first antenna bodies arranged along a first direction, and the second transparent antenna layer includes a plurality of second antenna bodies arranged along a second direction. At least one end of each first antenna body is provided with a first pin, and at least one end of each second antenna body is provided with a second pin. The first antenna body is directly electrically connected to the flexible printed circuit through the first pin, and the second antenna body is directly electrically connected to the flexible printed circuit through the second pin.

2. The transparent antenna according to claim 1, characterized in that, The flexible printed circuit includes a first flexible printed circuit and a second flexible printed circuit. The first flexible printed circuit is electrically connected to the first transparent antenna body through the first pin, and the second flexible printed circuit is electrically connected to the second transparent antenna body through the second pin.

3. The transparent antenna according to claim 1, characterized in that, The protective layer is a transparent material, or the protective layer is glass.

4. The transparent antenna according to claim 1, characterized in that, The first transparent antenna layer includes a first transparent dielectric layer and a first transparent antenna body disposed on the first transparent dielectric layer, and the second transparent antenna layer includes a second transparent dielectric layer and a second transparent antenna body disposed on the second transparent dielectric layer.

5. The transparent antenna according to claim 1, characterized in that, The first transparent antenna body is made of silver nanomaterial, the second transparent antenna body is made of silver nanomaterial, and the first pin and the second pin are made of silver nanomaterial.

6. The transparent antenna according to claim 4, characterized in that, The first transparent dielectric layer is a polyethylene terephthalate film material, and the second transparent dielectric layer is a polyethylene terephthalate film material.

7. The transparent antenna according to claim 4, characterized in that, The first transparent antenna layer and the second transparent antenna layer are bonded together with optical adhesive. The first antenna body and the second antenna body are perpendicular to each other to form a grid. The first antenna body and the second antenna body do not contact each other.

8. The transparent antenna according to any one of claims 1-7, characterized in that, The protective layer has a shielding edge, which divides the transparent antenna into a visible area and a non-visible area.

9. The transparent antenna according to claim 8, characterized in that, The first transparent antenna body and the second transparent antenna body are located in the visible area, and the first pin and the second pin are located in the non-visible area.

10. The transparent antenna according to claim 9, characterized in that, The flexible printed circuit is located in the non-visible area.

Images