Mobile phone rear cover with transparent antenna and mobile phone

Abstract

The utility model discloses a mobile phone rear cover containing a transparent antenna and a mobile phone, belongs to the technical field of wireless communication, and aims to solve the problem of poor communication performance of a printed antenna on the inner side of the conventional rear cover, the mobile phone rear cover containing the transparent antenna comprises a transparent protective film (1), a transparent antenna (2) and a rear cover plate (3) which are sequentially stacked, the transparent protective film (1) and the transparent antenna (2) are both located on the outer surface of the rear cover plate (3). According to the mobile phone with the transparent antenna, the transparent antenna is located on the outer surface of the rear cover plate, so that the wireless signal transmitting and receiving performance of the antenna is improved.

Description

Technical Field

[0001] This utility model relates to the field of wireless communication technology, specifically to a mobile phone back cover containing a transparent antenna, or a mobile phone. Background Technology

[0002] With the continuous development of mobile communication technology and the enrichment of wireless services, modern smartphones support an increasing number of wireless communication frequency bands, which places higher demands on the performance of mobile phone antennas. Smartphones require a large number of antennas, but the deployment space for antennas on a mobile phone is limited. On the one hand, mobile phone antennas need to meet the performance requirements of the mobile phone's wireless system, and on the other hand, they need to maintain the overall simplicity and aesthetics of the phone.

[0003] Modern smartphones primarily use two types of antennas: bezel antennas and printed antennas on the inside of the back cover. Bezel antennas place the antenna on the side of the phone's casing, utilizing the phone's metal frame and employing clever bezel break designs. This improves antenna radiation performance while seamlessly integrating the antenna with the phone's frame. However, the presence of bezel break points affects the phone's aesthetics, limiting the user experience for high-end users who prioritize a sleek design. Printed antennas, on the other hand, are fabricated on a printed circuit board or flexible circuit board and placed inside the phone's back cover. These avoid the bezel break point problem, but the back cover can obstruct the signal from the inner antenna, thus reducing the system's wireless performance. Utility Model Content

[0004] To address the issue of poor communication performance of printed antennas on the inside of existing back covers, this invention provides a mobile phone back cover and mobile phone with a transparent antenna. The transparent antenna of the mobile phone with the transparent antenna is located on the outer surface of the back cover, which improves the antenna's performance in transmitting and receiving wireless signals.

[0005] The technical solution adopted by this utility model embodiment to solve its technical problem is:

[0006] A mobile phone back cover with a transparent antenna includes a transparent protective film, a transparent antenna, and a back cover plate stacked in sequence, wherein the transparent protective film and the transparent antenna are both located on the outer surface of the back cover plate.

[0007] There is at least one transparent antenna. The transparent protective film and the transparent antenna are matched and stacked one by one. The material of the back cover is glass.

[0008] The transparent antenna contains a transparent conductive sheet that can transmit and receive wireless signals. The transparent conductive sheet is etched on the outer surface of the back cover.

[0009] The transparent antenna contains a transparent conductive sheet and a transparent flexible dielectric sheet. The transparent conductive sheet can transmit and receive wireless signals. The transparent conductive sheet is disposed on the outer surface of the transparent flexible dielectric sheet, and the inner surface of the transparent flexible dielectric sheet is bonded to the outer surface of the back cover plate by optical adhesive.

[0010] The transparent conductive sheet is made of one of the following materials: ITO, transparent oxide of FTO, AgHT, graphene, carbon nanotubes, silver nanowires, and metal mesh.

[0011] The transparent flexible dielectric sheet is made of one of PET, PDMS, and PI.

[0012] The transparent antenna can cover all operating frequency bands of the smartphone. The back cover is made of transparent material. The outer surface of the back cover has an antenna mounting area and a non-antenna mounting area. The transparent antenna is located in the antenna mounting area, and the non-antenna mounting area is a metasurface structure.

[0013] The mobile phone back cover containing the transparent antenna also includes a transparent flexible feed line and a circuit board module. The circuit board module is fixed to the inner surface of the back cover. The transparent antenna is connected to the circuit board module through the transparent flexible feed line. The transparent antenna is a planar Yagi antenna, which contains an active symmetrical dipole and two passive parasitic directional dipoles. The transparent flexible feed line contains a center feed line and two ground planes. One arm of the active symmetrical dipole is connected to the center feed line, and the other arm of the active symmetrical dipole is connected to one of the ground planes. The two passive parasitic directional dipoles are located above the active symmetrical dipole. The two ground planes act as reflectors, and the energy of the transparent antenna is radiated directly upwards.

[0014] The thickness of the transparent conductive sheet is 500nm to 750nm, the light transmittance of the transparent antenna is greater than 73%, and the sum of the thicknesses of the transparent protective film and the transparent antenna is less than 0.5mm.

[0015] A mobile phone includes a display screen and a back cover containing a transparent antenna, the inner surface of the back cover facing the display screen.

[0016] The beneficial effect of this utility model embodiment is that by integrating the transparent antenna on the outside of the mobile phone glass back cover, the antenna's performance in transmitting and receiving wireless signals is improved. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0018] Figure 1 This is an external schematic diagram of the mobile phone back cover containing a transparent antenna as described in this utility model.

[0019] Figure 2 This is a cross-sectional schematic diagram of the mobile phone back cover containing a transparent antenna according to the present invention.

[0020] Figure 3 This is a schematic diagram showing the shape and dimensions of a transparent antenna.

[0021] Figure 4 This is a schematic diagram of the reflection coefficient of a transparent antenna.

[0022] Figure 5 This is the far-field radiation pattern of the yoz plane of the transparent antenna at a frequency of 2.4 GHz.

[0023] Figure 6 This is the far-field radiation pattern of the xoy plane of the transparent antenna at a frequency of 2.4 GHz.

[0024] The annotations in the attached figures are explained as follows:

[0025] 1. Transparent protective film; 2. Transparent antenna; 3. Back cover; 4. Transparent flexible feeder; 5. Circuit board module;

[0026] 21. Transparent conductive sheet; 22. Transparent flexible dielectric sheet;

[0027] 31. Through hole. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] For ease of understanding and description, the following description of this utility model uses absolute positional relationships. Unless otherwise specified, the directional word "above" generally indicates... Figure 1 The upper direction in the middle, the directional word "down" roughly indicates Figure 1 The description is from the perspective of a reader or user, but the directional terms mentioned above should not be construed as limiting the scope of protection of this utility model. Regarding the dimensions and angles of the components, those skilled in the art can determine them specifically based on actual needs or a limited number of experiments.

[0030] like Figure 1 and Figure 2 As shown in the figure, a mobile phone back cover with a transparent antenna according to an embodiment of the present invention includes a transparent protective film 1, a transparent antenna 2 and a back cover plate 3 stacked in sequence, wherein the transparent protective film 1 and the transparent antenna 2 are both located on the outer surface of the back cover plate 3.

[0031] The outer surface of the back cover 3 faces away from the phone's display screen, while the inner surface of the back cover 3 faces the phone's display screen. Typically, a camera is mounted on the back cover 3, and the orientation of the outer surface of the back cover 3 is the same as the shooting direction of the camera on the back cover 3.

[0032] There is at least one transparent antenna 2. One or more transparent antennas 2 are integrated on the outer surface of the back cover plate 3. The transparent protective film 1 and the transparent antenna 2 are matched and stacked one by one. The transparent protective film 1 and the transparent antenna 2 are the same size. The material of the back cover plate 3 is transparent glass.

[0033] In this embodiment, the transparent antenna 2 includes a transparent conductive sheet 21 (or may also be called a transparent conductive film), which can be used to transmit and receive wireless signals. The transparent antenna 2 may also include a transparent flexible dielectric sheet 22. That is, the transparent antenna 2 includes a transparent conductive sheet 21, or the transparent antenna 2 includes a transparent conductive sheet 21 and a transparent flexible dielectric sheet 22.

[0034] When the transparent antenna 2 contains a transparent conductive sheet 21, the transparent conductive sheet 21 is adhered to or etched onto the outer surface of the rear cover plate 3. When the transparent antenna 2 contains a transparent conductive sheet 21 and a transparent flexible dielectric sheet 22, the transparent conductive sheet 21 is disposed on (etched onto) the outer surface of the transparent flexible dielectric sheet 22, and the inner surface of the transparent flexible dielectric sheet 22 is bonded to the outer surface of the rear cover plate 3 by a transparent optical adhesive.

[0035] In this embodiment, the transparent conductive sheet 21 is made of materials including, but not limited to, transparent oxides such as ITO (indium tin oxide) and FTO (fluorine-doped tin oxide), AgHT (silver-plated polymer), graphene, carbon nanotubes, silver nanowires, and metal (silver, copper, etc.) meshes. The transparent flexible dielectric sheet 22 is made of materials including, but not limited to, PET (polyethylene terephthalate), PDMS (polydimethylsiloxane), and PI (polyimide).

[0036] In this embodiment, the transparent antenna 2 can be rectangular, square, rhomboid, triangular, polygonal, circular, elliptical, fractal, or other shapes. The transparent protective film 1 has the same shape as the transparent antenna 2. The transparent antenna 2 can be a single-layer structure or a multi-layer structure.

[0037] One or more transparent antennas 2 are integrated on the outer surface of the back cover 3. Multiple transparent antennas 2 can form a multi-antenna structure, in which case the transparent antennas 2 can cover all operating frequency bands of the smartphone. The transparent antennas 2 can also be located in other positions on the back cover 3.

[0038] The back cover plate 3 is made of a transparent material, such as transparent glass. The outer surface of the back cover plate 3 includes an antenna mounting area and a non-antenna mounting area. The transparent antenna 2 is located in the antenna mounting area, meaning the transparent antenna 2 is matched and stacked with the antenna mounting area. The non-antenna mounting area is a metasurface structure; making it a transparent metasurface structure can suppress surface waves on the glass and improve antenna radiation performance.

[0039] The antenna mounting area and the non-antenna mounting area can be flush (located in the same plane), or the antenna mounting area can also be a groove structure, and the transparent protective film 1 and the transparent antenna 2 can be matched and installed in the groove structure. The outer surface of the transparent protective film 1 can be flush with the outer surface of the non-antenna mounting area, or the outer surface of the transparent antenna 2 can be flush with the outer surface of the non-antenna mounting area.

[0040] like Figure 1 and Figure 2 As shown, in this embodiment, the mobile phone back cover containing the transparent antenna also includes a transparent flexible feed line 4 and a circuit board module 5. The circuit board module 5 is fixed to the inner surface of the back cover 3, and the transparent antenna 2 is connected to the circuit board module 5 through the transparent flexible feed line 4.

[0041] Specifically, the back cover plate 3 has a through hole 31. The transparent protective film 1, the transparent antenna 2, the back cover plate 3 and the circuit main board module 5 are stacked and connected in sequence from the outside to the inside (directly or indirectly connected). The transparent flexible feed line 4 passes through the through hole 31, and the line feed port of the transparent antenna 2 is connected to the transparent flexible feed line 4.

[0042] In this embodiment, a coplanar waveguide (CPW) feed is used. The transparent antenna 2 contains a transparent conductive sheet 21 and a transparent flexible dielectric sheet 22. The transparent antenna 2 can be a planar Yagi antenna, such as... Figure 3 As shown, the transparent antenna 2 contains an active symmetrical dipole and two passive parasitic directional dipoles. The transparent flexible feed line 4 contains a center feed line and two ground planes. One arm of the active symmetrical dipole is connected to the center feed line, and the other arm is connected to a ground plane. The two passive parasitic directional dipoles are located above the active symmetrical dipole (corresponding to the earpiece of a mobile phone and the microphone of a mobile phone, respectively). The two ground planes act as reflectors, and the energy of the transparent antenna 2 is radiated directly upwards. All conductor parts are located on the same side of the transparent flexible dielectric sheet 22, reducing the processing complexity.

[0043] like Figure 3As shown, the specific values ​​of each dimension parameter in transparent antenna 2 are: Sub_L = 98mm, Sub_W = 60mm, G_L = 40mm, G_W = 4mm, An_L = 27.5mm, An_W = 4mm, de1_L = 40mm, de2_L = 24mm, de_W = 4mm, d1 = 0.5mm, d2 = 4mm, d3 = 3mm, d4 = 20mm.

[0044] In this embodiment, the transparent conductive sheet 21 is made of ITO, and its thickness can be 500nm to 750nm (e.g., 550nm). The surface resistance of the transparent conductive sheet 21 is less than 3 ohms per unit area. The transparent flexible dielectric sheet 22 is made of PET, and its thickness can be 0.1mm to 0.2mm (e.g., 0.125mm). The dielectric constant of the transparent flexible dielectric sheet 22 is 3.

[0045] The transparent antenna 2 has a light transmittance greater than 73% and a thickness less than 0.5mm. The antenna material has the characteristics of high transparency, good conformality, excellent conductivity, and low cost, and can be easily integrated into the outer side of the mobile phone glass back cover.

[0046] The following describes a mobile phone, which includes a display screen and a back cover containing a transparent antenna, with the inner surface of the back cover 3 facing the display screen.

[0047] The transparent antenna 2 in this embodiment was simulated using CST electromagnetic simulation software, and the port reflection coefficient was obtained as follows: Figure 4 As shown. From Figure 4 It can be seen that the antenna's reflection coefficient is less than -10dB in the 2.05GHz-2.8GHz range. The center frequency of the antenna's operation is 2.4GHz, corresponding to a reflection coefficient of -21dB.

[0048] Figure 5 and Figure 6 The far-field radiation patterns of the antenna in this embodiment are shown in the yoz and xoy planes, respectively. As can be seen from the figures, the maximum radiation direction of the antenna is located in the +y direction, indicating that the director and reflector in the designed transparent Yagi antenna (transparent antenna 2) are functioning correctly, and the antenna's radiation direction points towards the director end. When this transparent antenna 2 is integrated into the outer surface of the back cover 3 of the mobile phone, it radiates along the edge of the phone.

[0049] The above description is merely a specific embodiment of this utility model and should not be construed as limiting the scope of its implementation. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this utility model should still fall within its coverage. Furthermore, the technical features, technical solutions, and embodiments of this utility model can be freely combined and used.

Claims

1. A mobile phone back cover containing a transparent antenna, characterized in that, The mobile phone back cover containing the transparent antenna comprises a transparent protective film (1), a transparent antenna (2) and a back cover plate (3) arranged in sequence, and the transparent protective film (1) and the transparent antenna (2) are located on the outer surface of the back cover plate (3).

2. The mobile phone back cover with transparent antenna according to claim 1, wherein, The transparent antenna (2) is at least one, and the transparent protective film (1) and the transparent antenna (2) are matched and correspondingly connected in layers, and the material of the back cover plate (3) is glass.

3. The mobile phone back cover with transparent antenna according to claim 1, wherein, The transparent antenna (2) contains a transparent conductive sheet (21), the transparent conductive sheet (21) can emit and receive wireless signals, and the transparent conductive sheet (21) is etched on the outer surface of the back cover plate (3).

4. The mobile phone back cover with transparent antenna according to claim 1, wherein, The transparent antenna (2) contains a transparent conductive sheet (21) and a transparent flexible medium sheet (22), the transparent conductive sheet (21) can emit and receive wireless signals, the transparent conductive sheet (21) is arranged on the outer surface of the transparent flexible medium sheet (22), and the inner surface of the transparent flexible medium sheet (22) is bonded to the outer surface of the back cover plate (3) through optical glue.

5. The mobile phone back cover with transparent antenna according to claim 3 or 4, characterized in that, The material of the transparent conductive sheet (21) is one of ITO, FTO transparent oxide, AgHT, graphene, carbon nanotube, silver nanowire and metal mesh.

6. The mobile phone back cover with transparent antenna according to claim 4, wherein, The material of the transparent flexible medium sheet (22) is one of PET, PDMS and PI.

7. The mobile phone back cover with transparent antenna according to claim 1, wherein, The transparent antenna (2) can cover all working frequency bands of the smart phone, the material of the back cover plate (3) is transparent material, the outer surface of the back cover plate (3) contains an antenna mounting area and a non-antenna mounting area, the transparent antenna (2) is located in the antenna mounting area, and the non-antenna mounting area is a super surface structure.

8. The mobile phone back cover with transparent antenna according to claim 1, wherein, The mobile phone back cover containing the transparent antenna further comprises a transparent flexible feeder (4) and a circuit mainboard module (5), the circuit mainboard module (5) is fixed to the inner surface of the back cover plate (3), and the transparent antenna (2) is connected with the circuit mainboard module (5) through the transparent flexible feeder (4). The transparent antenna (2) is a planar Yagi antenna, the transparent antenna (2) contains an active symmetrical dipole and two passive parasitic director dipoles, the transparent flexible feeder (4) contains a center feeder and two ground planes, one arm of the active symmetrical dipole is connected with the center feeder, the other arm of the active symmetrical dipole is connected with one of the ground planes, the two passive parasitic director dipoles are located above the active symmetrical dipole, the two ground planes act as reflecting dipoles, and the energy of the transparent antenna (2) is radiated upward.

9. The mobile phone back cover with transparent antenna according to claim 4, wherein, The thickness of the transparent conductive sheet (21) is 500nm-750nm, the light transmittance of the transparent antenna (2) is greater than 73%, and the sum of the thicknesses of the transparent protective film (1) and the transparent antenna (2) is less than 0.5mm.

10. A handset, comprising: The mobile phone comprises a display screen and the mobile phone back cover containing the transparent antenna according to claim 1, and the inner surface of the back cover plate (3) faces the display screen.

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