Electronic device

Abstract

The embodiment of the present application provides an electronic device, comprising: a back shell having a receiving space, wherein the material of the back shell is metal; a metal plate arranged in the receiving space; an antenna assembly comprising a circuit board and an antenna branch, wherein the circuit board is arranged on the back shell, the antenna branch is located between the metal plate and the back shell, and the antenna branch is electrically connected with the circuit board; wherein the antenna assembly can feed the antenna branch through the circuit board, so that the antenna branch and the metal plate are capacitively coupled, and the metal plate radiates antenna signals outward. The metal plate is used as a carrier, electromagnetic signals are radiated from the antenna branch to the metal plate through coupling, and then radiated outward through the metal plate, so that the function of antenna radiation is realized, the communication demand can be met, and the integrity and the aesthetic degree of the back shell are maintained without the need of performing seam breaking and hole digging on the back shell.

Description

Technical Field

[0001] This application belongs to the field of electronic equipment technology, and in particular relates to an electronic device. Background Technology

[0002] In electronic devices such as mobile phones and tablets, metal is increasingly being used as the back cover material due to its unique luster and texture. Metal has a shielding effect on antenna signals. In all-metal back cover devices, to implement antenna solutions, it is usually necessary to cut off sections or add slits to the metal back cover to meet antenna performance requirements. However, this method of cutting off sections or adding slits compromises the integrity of the metal casing, resulting in a decrease in aesthetics. Utility Model Content

[0003] This application provides an electronic device that can maintain the integrity and aesthetics of the metal back cover while implementing an antenna scheme.

[0004] This application provides an electronic device, including:

[0005] The rear shell has a receiving space, and the material of the rear shell is metal;

[0006] A metal plate is disposed within the receiving space;

[0007] An antenna assembly includes a circuit board and an antenna stub, the circuit board being disposed on the rear housing, the antenna stub being located between the metal plate and the rear housing, and the antenna stub being electrically connected to the circuit board;

[0008] The antenna assembly can feed power to the antenna stub through the circuit board, causing the antenna stub to capacitively couple with the metal plate, and causing the metal plate to radiate antenna signals outward.

[0009] Optionally, the metal plate includes a screen frame, and the screen frame is made of stainless steel.

[0010] Optionally, the antenna stub has at least one sidewall parallel to the metal plate.

[0011] Optionally, the first distance between the antenna stub and the metal plate is less than the second distance between the antenna stub and the rear cover in the rear shell.

[0012] Optionally, the distance between the antenna stub and the metal plate ranges from 0.4 mm to 0.7 mm.

[0013] Optionally, the antenna assembly further includes a bracket mounted on the metal plate, and the bracket supports the antenna stub.

[0014] Optionally, the metal plate includes an adjacent first sidewall and a second sidewall, the antenna stub and the circuit board are both disposed along the first sidewall, and one end of the antenna stub is close to the second sidewall.

[0015] Optionally, the antenna assembly further includes a frequency tuner, which is disposed along the first sidewall and on the side of the circuit board opposite to the second sidewall. The frequency tuner abuts against the rear shell and the metal plate respectively, and is electrically connected to the rear shell and the metal plate respectively.

[0016] Optionally, the distance between the frequency tuner and the second sidewall is inversely correlated with the antenna frequency radiated by the metal plate.

[0017] Optionally, the antenna assembly further includes a shielding member that abuts against the rear cover and the metal plate, respectively, and the shielding member is used to allow the current signal dispersed in the metal plate to return to the circuit board through the rear cover.

[0018] Optionally, the shielding element is disposed along the second sidewall.

[0019] Optionally, the antenna stub is an FPC antenna.

[0020] Optionally, the length of the antenna stub is related to the inductive reactance, the distance between the antenna stub and the metal plate and the parallel area between the antenna stub and the metal plate are related to the capacitive reactance, and the impedance of the antenna assembly is related to the inductive reactance and the capacitive reactance.

[0021] In the electronic device of this application embodiment, a metal plate is used as a carrier. Electromagnetic signals are radiated from the antenna stubs to the metal plate through coupling, and then radiated outward through the metal plate, thereby realizing the antenna radiation function. This not only meets the communication requirements, but also eliminates the need to make cuts or holes in the back cover, thus maintaining the integrity and aesthetics of the back cover. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0024] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0025] Figure 2 This is an exploded structural diagram of an electronic device provided in an embodiment of this application.

[0026] Figure 3 for Figure 2 The diagram shows a partial structural diagram of part A of the electronic device.

[0027] Figure 4 This is a partial shaded structural diagram of an electronic device provided in an embodiment of this application.

[0028] Figure 5 for Figure 2 The graph shows the S11 parameters and antenna efficiency under the electronic device structure shown.

[0029] Figure 6 for Figure 2 The diagram shows a 3D simulation of the electronic device structure at a frequency of 2.46 GHz.

[0030] Figure 7 for Figure 2 The diagram shows a 3D simulation of the electronic device structure at a frequency of 5.56 GHz. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0032] In order to maintain the integrity and aesthetics of the metal back cover while implementing the antenna scheme, this application provides an electronic device, which will be described below with reference to the accompanying drawings.

[0033] For example, please refer to Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 2 This is an exploded structural diagram of an electronic device provided in an embodiment of this application. The electronic device 100 includes a rear shell 110, a metal plate 120, and an antenna assembly 130.

[0034] The electronic device 100 may be a mobile electronic device with communication functions, such as a mobile phone, tablet, or laptop. For ease of understanding, this application uses a tablet as an example for illustration.

[0035] The back cover 110 is made of metal and has a receiving space 112. In other words, the back cover 110 can be a structure formed by a back cover and a side panel, with the side panel connected to the back cover to form a receiving space.

[0036] The metal plate 120 is disposed within the receiving space 112. For example, the metal plate 120 may be disposed parallel to the rear cover of the rear housing 110.

[0037] The antenna assembly 130 includes a circuit board 131 and an antenna stub 132. The circuit board 131 is disposed on the rear cover 110, and the antenna stub 132 is located between the metal plate 120 and the rear cover 110. The antenna stub 132 is electrically connected to the circuit board 131.

[0038] The antenna assembly 130 can feed power to the antenna stub 132 through the circuit board 131, so that the antenna stub 132 and the metal plate 120 are capacitively coupled, and the metal plate 120 radiates the antenna signal outward.

[0039] In the electronic device 100 of this application embodiment, a metal plate 120 is used as a carrier. Electromagnetic signals are radiated from the antenna stub 132 to the metal plate 120 through coupling, and then radiated outward through the metal plate 120, thereby realizing the antenna radiation function. This not only meets the communication requirements, but also eliminates the need to make cuts or holes in the back cover 110, thus maintaining the integrity and aesthetics of the back cover 110.

[0040] The metal plate 120 includes a screen frame, which is made of stainless steel. The screen frame is a single, solid metal plate used to support the display screen of the electronic device 100. In other words, the antenna assembly 130 of this embodiment utilizes the metallic properties of the screen frame, using it as a carrier to allow electromagnetic signals to radiate from the antenna stub 132 onto the screen frame via coupling, and then radiate outwards through the screen frame, thereby achieving the antenna's radiation function. Furthermore, there are no other metal components affecting the side of the screen frame facing the display screen, thus reducing interference with the antenna's radiation performance.

[0041] Of course, the metal plate 120 is not limited to the screen frame. The metal plate 120 can also be a metal plate that is independently set below the display screen. This application uses the metal plate 120 as a screen frame as an example for illustration, and should not be construed as a limitation on the metal plate 120.

[0042] Since the antenna stub 132 needs to generate a capacitance effect with the metal plate 120, the antenna stub 132 has at least one sidewall parallel to the metal plate 120.

[0043] It should be noted that the antenna stub 132 can be a long strip structure, and can also be referred to as a radiator. The antenna stub 132 can be, for example, an FPC antenna. An FPC antenna is a printed circuit antenna made of flexible material, characterized by its thinness, flexibility, and bendability. Using flexible material for the antenna stub 132 facilitates assembly and connection to the circuit board 131. Of course, the antenna stub 132 can also be other types of antennas; this is merely an example and should not be construed as a limitation on the type of antenna stub 132.

[0044] For example, the antenna assembly 130 also includes a bracket (not shown in the figure), which is mounted on the metal plate 120 and supports the antenna stub 132. The bracket can be made of insulating materials such as plastic, which can reduce the overall weight and reduce interference to the antenna.

[0045] For example, for long strip-shaped and sheet-shaped antenna stubs 132, their largest sidewall can be installed as a sidewall parallel to the metal plate 120 to improve the capacitive coupling effect. In this case, the antenna stub 132 is set parallel to the metal plate 120, which can facilitate the installation of the antenna stub 132, reduce the cumbersome positioning, and improve the capacitive coupling effect.

[0046] Furthermore, since the rear cover 110 is made of metal, in order to avoid the influence of the rear cover 110 on the radiated signal of the antenna stub 132, the first distance between the antenna stub 132 and the metal plate 120 can be set to be less than the second distance between the antenna stub 132 and the rear cover in the rear cover 110, that is, the antenna stub 132 is closer to the metal plate 120.

[0047] For example, the distance between the antenna stub 132 and the metal plate 120 ranges from 0.4 mm to 0.7 mm, such as being set to 0.5 mm, to adjust the capacitive reactance in coordination with the parallel area between the antenna stub 132 and the metal plate 120.

[0048] It should be noted that the length of the antenna stub 132 is related to the inductive reactance, the distance between the antenna stub 132 and the metal plate 120 and the parallel area between the antenna stub 132 and the metal plate 120 are related to the capacitive reactance, and the impedance of the antenna assembly 130 is related to both the inductive and capacitive reactance. That is, by adjusting the balance of the inductive and capacitive reactance, the impedance of the antenna system can be made as close as possible to 50 ohms, thereby generating stronger radiation.

[0049] Please combine Figure 1 and Figure 2 And see Figure 3 and Figure 4 , Figure 3 for Figure 2The diagram shows a partial structural diagram of electronic device A. Figure 4 This is a partial shaded structural diagram of the electronic device provided in an embodiment of this application. The diagram illustrates the positional relationships between the components. Figure 4 The metal plate in the image is shown through a perspective view. The antenna stub 132 and circuit board 131 can be positioned, for example, on the sidewall of the metal plate 120. For instance, the metal plate 120 includes adjacent first sidewall 121 and second sidewall 122. The corner where the first sidewall 121 and second sidewall 122 connect can correspond to a corner of the rear shell 110. For example, if the electronic device 100 is a tablet, the corner corresponding to the first sidewall 121 and second sidewall 122 can be a corner of the tablet other than the camera position, reducing the difficulty of arranging the camera position device and making the antenna assembly 130 more flexible in its placement, and facilitating the adjustment of the frequency radiated by the antenna assembly 130.

[0050] The antenna stub 132 and the circuit board 131 are both arranged along the first sidewall 121, and the extension direction of the antenna stub 132 is along the first sidewall 121, so that one end of the antenna stub 132 is close to the second sidewall 122.

[0051] It should be noted that the circuit board 131 has a power supply, or power supply point, which is located on the side of the circuit board 131 opposite to the rear cover 110. The circuit board 131 also has a matching circuit connected to the power supply. The matching circuit can be electrically connected to the motherboard of the electronic device 100. The matching circuit can output the processed signal through the power supply to control the radiation parameters of the antenna, such as the radiation frequency.

[0052] The power supply from circuit board 131 to antenna stub 132 can be achieved using a power supply component. For example, antenna assembly 130 further includes a power supply component, with its two ends electrically connected to antenna stub 132 and circuit board 131, respectively. It is understood that the power supply component is electrically connected to the power supply of circuit board 131, and the power supply component can be understood as a metal wire; circuit board 131 supplies power to antenna stub 132 through the power supply component.

[0053] It should be noted that the antenna radiation effect is better when the power supply of the electronic device 100 is placed near the edge of the device. Therefore, in this embodiment, the circuit board 131 is placed near the edge of the rear cover 110.

[0054] The adjustment of the antenna radiation frequency is also related to the path length of the current loop.

[0055] For example, the antenna assembly 130 further includes a frequency tuner 134, which is disposed along the first sidewall 121 and on the side of the circuit board 131 facing away from the second sidewall 122. The frequency tuner 134 abuts against the rear housing 110 and the metal plate 120 respectively, and is electrically connected to both the rear housing 110 and the metal plate 120. The distance between the frequency tuner 134 and the second sidewall 122 affects the path length of the current loop, thereby tuning the frequency of electromagnetic radiation. Specifically, the distance between the frequency tuner 134 and the second sidewall 122 is inversely correlated with the antenna frequency radiated by the metal plate 120; that is, the greater the distance between the frequency tuner 134 and the second sidewall 122, the longer the current path, and the lower the corresponding antenna frequency. Therefore, the antenna frequency can be adjusted by adjusting the distance between the frequency tuner 134 and the second sidewall 122.

[0056] The frequency tuning component 134 can be made of conductive foam, which can both support the metal plate 120 and conduct electricity.

[0057] For example, the antenna assembly 130 further includes a shield 135, which abuts against the rear housing 110 and the metal plate 120 respectively, and is electrically connected to both the rear housing 110 and the metal plate 120. The shield 135 is used to allow the dispersed current signal in the metal plate 120 to return to the circuit board 131 through the rear housing 110, thereby preventing the dispersed signal from interfering with the radiated signal. The shield 135 may be disposed along the second sidewall 122. The shield 135 may also be made of conductive foam.

[0058] The working principle of the antenna assembly 130 and the metal plate 120 in this embodiment is as follows: The circuit board 131 is fixed on the metal back cover 110. The feed position connects the circuit board 131 and the antenna stub 132. The antenna stub 132 is located between the metal plate 120 and the back cover 110, close to the metal plate 120. The current signal flows from the circuit board 131 through the feed position into the antenna stub 132. Because the antenna stub 132 is close to the metal plate 120 and there is a parallel plane, when the AC signal flows into the antenna stub 132, a capacitance effect is generated, and the current charge flows into the metal plate 120, that is, the current signal is radiated into the metal plate 120. When the AC signal enters the metal plate 120, it flows back to the metal back cover 110 through the frequency tuning element 134, and then flows into the circuit board 131 to form a current loop and generate a radiation effect.

[0059] For example, please refer to Figures 5 to 7 As shown, Figure 5 for Figure 2 The graphs showing the S11 parameters and antenna efficiency under the illustrated electronic device structure are shown. Figure 6 for Figure 2The diagram shows a 3D simulation of the electronic device structure at a frequency of 2.46 GHz. Figure 7 for Figure 2 The diagram shows a 3D simulation of the 5.56GHz frequency in the electronic device structure. The resonant frequencies of the antenna assembly 130 and the metal plate 120 in this embodiment are dual-band, such as a Wi-Fi antenna, i.e., resonant frequencies of 2400MHz to 2500MHz and 5150MHz to 5850MHz. Of course, the antenna assembly 130 and the metal plate 120 can also radiate other frequencies, such as an NFC antenna. This embodiment uses a Wi-Fi antenna as an example for illustration and should not be construed as a limitation on the antenna frequency.

[0060] Among them, according to simulation tests, such as Figure 6 and Figure 7 As shown, the average efficiency of the antenna assembly 130 and the metal plate 120 in this embodiment of the application is -2dB for radiating 2400MHz to 2500MHz and -1.3dB for radiating 5150MHz to 5850MHz.

[0061] In the electronic device 100 provided in this application embodiment, by utilizing the metallic properties of the original metal plate 120 of the electronic device 100, such as the screen frame, and using the screen frame as a carrier, electromagnetic signals are radiated from the antenna to the screen frame through coupling, and then radiated outward through the screen frame, thereby realizing the antenna radiation function. This not only meets the communication requirements, but also eliminates the need to make cuts or cuts in the metal back cover, maintaining the integrity and aesthetics of the back cover and improving the appearance competitiveness.

[0062] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0063] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0064] The electronic devices provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An electronic device, characterized in that, include: The rear shell has a receiving space, and the material of the rear shell is metal; A metal plate is disposed within the receiving space; An antenna assembly includes a circuit board and an antenna stub, the circuit board being disposed on the rear housing, the antenna stub being located between the metal plate and the rear housing, and the antenna stub being electrically connected to the circuit board; The antenna assembly can feed power to the antenna stub through the circuit board, causing the antenna stub to capacitively couple with the metal plate, and causing the metal plate to radiate antenna signals outward.

2. The electronic device according to claim 1, characterized in that, The metal plate includes a screen frame, and the screen frame is made of stainless steel.

3. The electronic device according to claim 1, characterized in that, The antenna stub has at least one sidewall parallel to the metal plate.

4. The electronic device according to claim 3, characterized in that, The first distance between the antenna stub and the metal plate is less than the second distance between the antenna stub and the rear cover in the rear shell.

5. The electronic device according to claim 3, characterized in that, The distance between the antenna stub and the metal plate ranges from 0.4 mm to 0.7 mm.

6. The electronic device according to claim 3, characterized in that, The antenna assembly also includes a bracket mounted on the metal plate, and the bracket supports the antenna stubs.

7. The electronic device according to claim 1, characterized in that, The metal plate includes an adjacent first sidewall and a second sidewall. The antenna stub and the circuit board are both disposed along the first sidewall, and one end of the antenna stub is close to the second sidewall.

8. The electronic device according to claim 7, characterized in that, The antenna assembly further includes a frequency tuner, which is disposed along the first sidewall and on the side of the circuit board opposite to the second sidewall. The frequency tuner abuts against the rear shell and the metal plate respectively, and is electrically connected to the rear shell and the metal plate respectively.

9. The electronic device according to claim 8, characterized in that, The distance between the frequency tuner and the second sidewall is inversely correlated with the antenna frequency radiated by the metal plate.

10. The electronic device according to claim 7, characterized in that, The antenna assembly also includes a shielding component that abuts against the rear cover and the metal plate, respectively. The shielding component is used to allow the current signal dispersed in the metal plate to return to the circuit board through the rear cover.

11. The electronic device according to claim 10, characterized in that, The shielding element is disposed along the second sidewall.

12. The electronic device according to any one of claims 1 to 11, characterized in that, The antenna stub is an FPC antenna.

13. The electronic device according to any one of claims 1 to 11, characterized in that, The length of the antenna stub is related to the inductive reactance, the distance between the antenna stub and the metal plate and the parallel area between the antenna stub and the metal plate are related to the capacitive reactance, and the impedance of the antenna assembly is related to the inductive reactance and the capacitive reactance.

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