Battery cover assembly and electronic equipment

Abstract

The invention provides a battery cover assembly and electronic equipment, and relates to the technical field of antennas. The battery cover assembly provided by the invention comprises a battery cover body, a first radiator and a second radiator, the battery cover body is provided with a first surface and a second surface which are oppositely arranged. The first radiator and the second radiator are arranged on the first surface, the first radiator is arranged between the second radiator and the first surface, a feeding point is arranged on the second radiator, and the second radiator is used for coupling signals to the first radiator. The first radiating body and the second radiating body form the radiating unit of the traveling wave antenna, and the first radiating body is positioned between the second radiating body and the first surface, so that the distance between the first radiating body and the floor of the electronic equipment is increased, the clearance of the first radiating body is increased, and the radiation efficiency of the traveling wave antenna is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of antenna technology, and in particular to a battery cover assembly and an electronic device. Background Art

[0002] Antennas are an indispensable component of electronic devices. Their bandwidth and radiation efficiency directly impact the communication quality of these devices. With the advancement of communication technology and electronic devices, higher requirements are being placed on the bandwidth and radiation efficiency of electronic device antennas.

[0003] Taking mobile phones as an example, there are many types of antennas in mobile phones, such as frame antennas and traveling-wave antennas on the back cover. Traveling-wave antennas are antennas whose input electromagnetic field exhibits a traveling-wave distribution. Traveling-wave antennas on the back cover of mobile phones are primarily used for long-distance communication and high-speed data transmission. However, due to the limited thickness of electronic devices, the distance between the back cover and the floor is small, which means that the distance between the traveling-wave antenna and the floor is small, resulting in low radiation efficiency. Summary of the Invention

[0004] Embodiments of the present application provide a battery cover assembly and an electronic device, which are used to solve the problem of low radiation efficiency of traveling wave antennas in existing electronic devices.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions: In a first aspect, an embodiment of the present application provides a battery cover assembly, which includes a battery cover body, a first radiator, and a second radiator.

[0006] The battery cover body has a first surface and a second surface arranged opposite to each other. A first radiator and a second radiator are arranged on the first surface, the first radiator is arranged between the second radiator and the first surface, a feeding point is arranged on the second radiator, and the second radiator is used to couple signals to the first radiator.

[0007] The battery cover assembly provided in the first aspect of the present application can feed power to the second radiator via a feeding point. Specifically, the RF signal from the RF transceiver circuit can be fed to the second radiator via the feeding point, and then coupled from the second radiator to the first radiator. The first radiator and the second radiator form the radiating element of the antenna. Furthermore, by positioning the first radiator between the second radiator and the first surface, the distance between the first radiator and the floor of the electronic device is increased, thereby increasing the clearance of the first radiator and improving the radiation efficiency of the antenna.

[0008] In conjunction with the first aspect, in one possible implementation, the projection of the first radiator on the first surface at least partially overlaps with the projection of the second radiator on the first surface. Thus, by overlapping the projections of the first radiator and the second radiator on the first surface, the area occupied by the radiating elements formed by the first and second radiators on the battery cover body can be reduced, thereby enabling the arrangement of more radiating elements on the battery cover body, which is beneficial for improving the gain of the traveling wave antenna.

[0009] In conjunction with the first aspect, in another possible implementation, both the first and second radiators include capacitor structures, which are configured to radiate signals outward with the assistance of the floor of the electronic device. In this manner, both the first and second radiators include capacitor structures, which can modulate the effective refractive index of the waveguide, thereby changing the radiation angle of the beam and achieving beam control.

[0010] In conjunction with the first aspect, in another possible implementation, the capacitor structure includes a first comb electrode and a second comb electrode arranged opposite each other; the first comb electrode includes a first bus bar and a plurality of first electrode fingers, the plurality of first electrode fingers being arranged at intervals along the extension direction of the first bus bar; the second comb electrode includes a second bus bar and a plurality of second electrode fingers, the plurality of second electrode fingers being arranged at intervals along the extension direction of the second bus bar, the second electrode fingers being arranged at intervals and alternating with the first electrode fingers. In this way, both the first and second radiators have interdigitated capacitor structures, and the interdigital coupling between the first electrode fingers of the first comb electrode and the second electrode fingers of the second comb electrode can generate a left-handed series capacitor effect.

[0011] In conjunction with the first aspect, in another possible implementation, the battery cover assembly further includes a conductive post disposed between the first radiator and the second radiator, with one end of the conductive post coupled to the first radiator and the other end of the conductive post coupled to the second radiator. In this manner, the first radiator and the second radiator are directly coupled via the conductive post, resulting in a radiating unit comprising the first radiator and the second radiator having excellent low-frequency characteristics, greater stability, and lower noise. The conductive post may be integrally formed with the first radiator and the second radiator, or the conductive post may be separately disposed and then coupled to the first radiator and the second radiator via welding, plugging, or other methods.

[0012] In combination with the first aspect, in another possible implementation, the battery cover assembly further includes a dielectric layer, the dielectric layer being attached to the first surface of the battery cover body, the first radiator being disposed between the dielectric layer and the first surface, and the second radiator being disposed on the side of the dielectric layer facing away from the battery cover body. The dielectric layer is generally used for decoration, buffering, and heat dissipation. By disposing the first radiator between the dielectric layer and the first surface of the battery cover body, if the dielectric layer and the battery cover body are regarded as a whole battery cover, the above structure is equivalent to disposing the first radiator inside the battery cover. Compared to disposing the first radiator and the second radiator entirely on the inner surface of the battery cover (i.e., the surface of the dielectric layer away from the battery cover body), the above structure increases the distance between the first radiator and the floor on the mainboard, i.e., increases the clearance of the first radiator, thereby improving the radiation efficiency of the first radiator.

[0013] In conjunction with the first aspect, in another possible implementation, the battery cover assembly further includes a ground layer disposed on the battery cover body, the ground layer being coupled to a ground point of the second radiator. In this manner, the ground point of the second radiator is coupled to the ground layer, i.e., the radiating unit formed by the second radiator and the first radiator is coupled to the ground layer, thereby ensuring stability of the antenna signal transmitted by the radiating unit. The ground point of the second radiator and the feed point may be spaced apart or may overlap.

[0014] In conjunction with the first aspect, in another possible implementation, the ground layer and the second radiator are provided on the same layer. It is understood that providing the ground layer and the second radiator on the same layer means that both the ground layer and the second radiator are provided on the first surface of the battery cover body, or both the ground layer and the second radiator are provided on the side of the dielectric layer facing away from the battery cover body. This facilitates direct coupling between the ground layer and the grounding point of the second radiator without requiring a hole in the dielectric layer, facilitating production and processing, and reducing production costs.

[0015] In conjunction with the first aspect, in another possible implementation, the battery cover assembly further includes an inductor structure, and the ground point of the second radiator is coupled to the ground layer via the inductor structure. In this way, the inductor structure can provide impedance matching for the antenna, thereby adjusting the load power and suppressing signal reflections. The inductor structure can be a single inductor or an equivalent inductor composed of multiple components.

[0016] In conjunction with the first aspect, in another possible implementation, the inductor structure includes an inductor line, one end of which is coupled to a ground layer, and the other end of which is coupled to a ground point of the second radiator. The inductor line has high stability and reliability, and good frequency characteristics, which helps improve the sensitivity of the antenna.

[0017] In conjunction with the first aspect, in another possible implementation, the battery cover body is an insulator. Thus, when the battery cover body is an insulator, the battery cover does not provide electromagnetic shielding for the first radiator and the second radiator, thereby not affecting the normal transmission and reception of antenna signals by the first radiator and the second radiator.

[0018] In conjunction with the first aspect, in another possible implementation, the battery cover body is a conductor, and a radiation window is provided on the battery cover body. The radiation window extends through the battery cover body along the thickness of the battery cover body, and the radiation window faces the first radiator and / or the second radiator. Since, when the battery cover body is a conductor, the battery cover will provide electromagnetic shielding for the first and second radiators, providing the radiation window on the battery cover body at a position opposite the first and / or second radiators prevents the battery cover body from providing electromagnetic shielding for the first and second radiators, thereby ensuring that the first and second radiators can normally transmit and receive antenna signals.

[0019] In conjunction with the first aspect, in another possible implementation, the battery cover assembly further includes a sealing member, which is an insulator and fills the radiation window. This sealing member can block the radiation window, preventing foreign matter (such as moisture, grease, dust, etc.) from entering the electronic device through the radiation window. Furthermore, filling the radiation window with the sealing member can enhance the appearance of the battery cover. Furthermore, because the sealing member is an insulator, it does not provide electromagnetic shielding for the first and second radiators.

[0020] In conjunction with the first aspect, in another possible implementation, the operating frequency band of the first radiator and the second radiator is 3.3 GHz to 3.6 GHz. That is, the radiation unit composed of the first radiator and the second radiator in the battery cover assembly provided in this application can be suitable for 5G mid-band communication.

[0021] In a second aspect, the present application provides an electronic device comprising a middle frame, a mainboard, and the battery cover assembly provided in the first aspect. The middle frame is configured to define a housing, the mainboard is disposed within the housing, and a floor is provided on the mainboard. A battery cover body covers one side of the middle frame, a first radiator and a second radiator are located between the battery cover body and the floor, and the floor assists the first and second radiators in transmitting signals.

[0022] It can be understood that the beneficial effects that can be achieved by the electronic device described in the second aspect and any possible implementation thereof provided above can refer to the beneficial effects in the first aspect and any possible implementation thereof, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the overall structure of an electronic device provided in an embodiment of the present application; Figure 2 For the above Figure 1 Structural explosion diagram of electronic equipment; Figure 3 for Figure 1 Schematic diagram of partial structural cross section of electronic equipment; Figure 4 A schematic cross-sectional view of a local structure of a battery cover assembly provided in an embodiment of the present application; Figure 5 A schematic cross-sectional view of a partial structure of another battery cover assembly provided in an embodiment of the present application; Figure 6 A schematic diagram of the three-dimensional structure of the first radiator and the second radiator provided in an embodiment of the present application; Figure 7 for Figure 6 A partial enlarged view of point A in the middle; Figure 8 for Figure 6 A schematic diagram of the cross-sectional dimensions of the middle battery cover assembly; Figure 9 Schematic diagram of the cross-sectional electric field vector within the battery cover body in the control structure; Figure 10 This is a simulation diagram of the electric field inside the battery cover body in the control structure; Figure 11 A schematic diagram of the cross-sectional electric field vector of the design structure provided in an embodiment of the present application; Figure 12 A simulation diagram of the electric field distribution of the design structure provided in the embodiment of the present application; Figure 13 Schematic diagram of the S11 curve of the control structure and the design structure provided in the examples of the present application; Figure 14 Schematic diagram of radiation efficiency simulation for a control structure and a design structure provided in an embodiment of the present application; Figure 15 Schematic diagram of metal loss simulation for a control structure and a design structure provided in an embodiment of the present application; Figure 16 Schematic diagram of dielectric loss simulation for a control structure and a design structure provided in an embodiment of the present application; Figure 17 A schematic cross-sectional view of a partial structure of another battery cover assembly provided in an embodiment of the present application; Figure 18 A schematic cross-sectional view of the partial structure of another battery cover assembly provided in an embodiment of the present application.

[0024] Reference numerals: 01. Electronic device; 10. Display module; 11. Transparent cover plate; 12. Display screen; 20. Housing; 21. Middle frame; 211. Frame; 212. Middle plate; 22. Back cover; 23. Battery cover assembly; 231. Battery cover body; 231a. First surface; 231b. Second surface; 2310. Radiation window; 232. First radiator; 233. Second radiator; 233a. Feeding point; 233b. Grounding point; 234. First comb electrode; 2341. First bus bar; 2342. First electrode finger; 235. Second comb electrode; 2351. Second bus bar; 2352. Second electrode finger; 236. Conductive column; 237. Dielectric layer; 238. Ground layer; 239. Inductor; 24. Sealing piece; 30. Camera module; 40. Main board; 41. Floor; 50. Camera decorative cover; 60. Battery; 70. Antenna; 71. RF transceiver circuit; 72. Radiating element; 73. Transmission line. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the application more clear, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0026] In the description of this application, it should be clarified that the terms "vertical," "transverse," "longitudinal," "front," "rear," "left," "right," "upper," "lower," and "horizontal," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used solely to facilitate the description of this application. They do not imply that the devices or components referred to must have specific orientations or positions, and therefore should not be construed as limitations on this application. The term "quantity" should also not be construed as a limitation on this application.

[0027] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0028] For ease of understanding, the technical terms involved in this application are explained and described below.

[0029] Coupling: Coupling can be understood as direct coupling and / or indirect coupling. Direct coupling, also known as electrical connection, refers to physical contact and electrical conduction between components. It can also be understood as the connection between different components in a circuit structure through physical lines such as printed circuit board (PCB) copper foil or wires that can transmit electrical signals. Indirect coupling can be understood as electrical conduction between two conductors through air / non-contact. Indirect coupling can also be called capacitive coupling, for example, where the gap between two conductive parts forms an equivalent capacitor to achieve signal transmission.

[0030] Traveling wave: A traveling wave refers to a transmission state of a plane wave on a transmission line, in which the amplitude changes exponentially along the propagation direction, and the phase changes linearly along the transmission line.

[0031] Leaky-wave antenna: When electromagnetic waves propagate along a traveling-wave structure, if they continuously radiate along the structure, the radiated waves are called leaky waves. Accordingly, the structure that generates leaky waves is called a leaky-wave antenna. A leaky-wave antenna is a traveling-wave antenna (i.e., an antenna whose input electromagnetic field exhibits a traveling-wave distribution).

[0032] Composite right / left-handed transmission line (CRLH-TL): A composite right / left-handed transmission line is an artificial electromagnetic material structure with both left-handed and right-handed properties. It has the characteristics of being able to simultaneously realize left-handed and right-handed wave propagation, achieve negative refractive index, and achieve broadband harmonic suppression.

[0033] An embodiment of the present application provides an electronic device 01. Specifically, the electronic device 01 may be a portable electronic device or another type of electronic device. For example, the electronic device may be a mobile phone, a tablet personal computer, a personal digital assistant (PDA), a wearable device, or the like. For ease of explanation, the following description uses a mobile phone as an example of the electronic device 01.

[0034] See Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the overall structure of the electronic device 01 provided in an embodiment of the present application. Figure 2 For the above Figure 1Exploded diagram of the structure of electronic device 01. As can be seen from the above, in this embodiment, electronic device 01 is a mobile phone and can be in the form of a roughly rectangular plate. Electronic device 01 can include a display module 10, a housing 20, a camera module 30, a mainboard 40, a camera decorative cover 50, a battery 60, and an antenna 70.

[0035] For the convenience of the following description, an XYZ coordinate system is established, defining the width direction of the electronic device 01 as the X-axis direction, the length direction of the electronic device 01 as the Y-axis direction, and the thickness direction of the electronic device 01 as the Z-axis direction. It can be understood that Figure 1 and Figure 2 Only some components of the electronic device 01 are schematically shown, and the actual shapes, sizes, positions and structures of these components are not affected by the present invention. Figure 1 and Figure 2 restrictions.

[0036] The above-mentioned display module 10 is used to display images, videos, etc. The display module 10 may include a transparent cover plate 11 and a display screen 12 (panel, also called a display panel), and the transparent cover plate 11 and the display screen 12 are stacked. The material of the transparent cover plate 11 includes but is not limited to glass. For example, the transparent cover plate 11 can adopt an ordinary transparent cover plate to protect the display screen to prevent the display screen from being damaged by external force, and it can also play a dust-proof role. Alternatively, the transparent cover plate 11 can also adopt a transparent cover plate with a touch function, so that the electronic device 01 has a touch function, which makes it more convenient for users to use. Therefore, the present application does not specifically limit the specific material of the transparent cover plate 11.

[0037] Furthermore, the display screen 12 may be a flexible display screen or a rigid display screen. For example, the display screen 12 may be an organic light-emitting diode (OLED) display panel, an active-matrix organic light-emitting diode (AMOLED) display panel, a mini organic light-emitting diode (OLED) display panel, a micro light-emitting diode (LED) display panel, a micro organic light-emitting diode (OLED) display panel, a quantum dot light-emitting diode (QLED) display panel, or a liquid crystal display (LCD) display panel.

[0038] The housing 20 is used to protect the electronic components inside the electronic device 01. The housing 20 may include a middle frame 21 and a back cover 22. The back cover 22 is located on the side of the display screen 12 away from the light-transmitting cover plate 11 and is stacked with the light-transmitting cover plate 11 and the display screen 12. The middle frame 21 is located between the light-transmitting cover plate 11 and the back cover 22, and both the light-transmitting cover plate 11 and the back cover 22 are fixed to the middle frame 21. For example, the back cover 22 can be fixed to the middle frame 21 by bonding, threading, welding, snapping, etc. The light-transmitting cover plate 11 can be fixed to the middle frame 21 by gluing, so that the light-transmitting cover plate 11, the back cover 22 and the middle frame 21 form an internal accommodation space inside the electronic device 01. The display screen 12, the mainboard 40, the camera module 30 and the antenna 70 are all arranged in the internal accommodation space.

[0039] In some embodiments, the above-mentioned middle frame 21 may include a frame 211 and a middle plate 212. The frame 211 is arranged around the middle plate 212, and the middle plate 212 is fixedly connected to the frame 211. For example, the middle plate 212 and the frame 211 can be fixedly connected by gluing, threading, welding, snapping, etc.; or, the middle plate 212 and the frame 211 can also be an integrally formed structure, that is, the middle plate 212 and the frame 211 form a structural component as a whole, and there is no partition between the middle plate 212 and the frame 211. Compared with the split structure, the one-piece structure is stronger and more secure, and is also easier to assemble.

[0040] The middle plate 212 is located on the side of the display screen 12 away from the transparent cover plate 11. The middle plate 212 divides the aforementioned housing space into two independent compartments. One compartment, located between the transparent cover plate 11 and the middle plate 212, houses the display screen 12. The other compartment, located between the middle plate 212 and the back cover 22, houses the aforementioned mainboard 40, camera module 30, battery 60, and antenna 70.

[0041] The camera module 30 is used to capture video or images and can achieve auto focus (AF), thus being applicable to a variety of shooting scenarios. Figure 2 As shown, the camera module 30 is located near the edge of one side of the back cover 22. Alternatively, the camera module 30 can be located in the middle of the upper part of the back cover 22 ( Figure 2 (not shown). Therefore, this application does not specifically limit the specific location of the camera module 30. The camera decorative cover 50 is used to prevent foreign matter such as dust from entering the interior of the electronic device 01 or the camera module 30, and to prevent the camera module 30 from being scratched or hit by external objects.

[0042] The motherboard 40 is used to house the electronic components of the electronic device 01 and to achieve electrical connections between the electronic components. For example, the electronic components may be a control chip (e.g., a system-on-chip, SOC), a graphics processing unit (GPU), a universal flash storage (UFS), an earpiece, a flash module, resistors, capacitors, inductors, etc. A floor 41 is provided on the motherboard 40. The floor 41 is electrically connected to the middle frame 21 and is used to ground the various electronic components and circuits within the electronic device 01. It is understood that the floor 41 may be a separate circuit board provided on one side of the motherboard 40, or the floor 41 may be a metal layer integrated into the motherboard 40. The following description assumes that the floor 41 is integrated into the motherboard 40.

[0043] The antenna 70 is used to receive and transmit antenna signals. For example, the antenna 70 may be a traveling wave antenna or a standing wave antenna. The following embodiments describe the antenna 70 as a leaky wave antenna (a leaky wave antenna is a traveling wave antenna).

[0044] Specifically, the antenna 70 may include a radio frequency transceiver circuit 71, a radiating element 72, and a transmission line 73. The radio frequency transceiver circuit 71 is used to receive radio frequency signals transmitted from the radiating element 72 or to send radio frequency signals to the radiating element 72. The radio frequency transceiver circuit 71 may be integrated into a radio frequency transceiver chip or a central processor of the electronic device 01. In addition, the radio frequency transceiver circuit 71 may also be separately provided on the mainboard 40.

[0045] The radiating element 72 is provided on the inner surface of the back cover 22, and the radiating element 72 is used to receive the radio frequency signal sent by the radio frequency transceiver circuit 71 and send the antenna signal outside the electronic device 01. Alternatively, the radiating element 72 can also be used to receive the antenna signal outside the electronic device 01 and transmit it to the radio frequency transceiver circuit 71. The radio frequency transceiver circuit 71 and the radiating element 72 can be connected through a transmission line 73, so that the radio frequency signal can be directly transmitted to the radiating element 72 through the transmission line 73, and the position on the radiating element 72 that contacts the transmission line 73 is the feeding point. A plurality of radiating elements 72 can be provided, and the feeding points of the plurality of radiating elements 72 are all connected to the transmission line 73. Exemplarily, the transmission line 73 can be a composite left-handed and right-handed transmission line.

[0046] In some embodiments, a radio frequency front end may be provided between the radiating element 72 and the radio frequency transceiver circuit 71, and the radio frequency front end is located on the main board 40. The radio frequency front end may include components such as an antenna switch (for switching between receiving and transmitting radio frequency signals), a power amplifier (for amplifying radio frequency signals in the transmitting channel), a low-noise amplifier (for amplifying radio frequency signals in the receiving channel), and a filter (for retaining signals within a specific frequency band and filtering out signals outside the specific frequency band).

[0047] See Figure 3 As shown, Figure 3 for Figure 1 A schematic cross-sectional view of a partial structure of electronic device 01 (parallel to the YZ plane). Since radiator 72 is generally located on the inner surface of back cover 22, which is positioned opposite motherboard 40, and the thickness of electronic devices 01 is decreasing, the distance between radiator 72 and floor 41 on motherboard 40 is smaller, meaning that the clearance for radiator 72 is smaller, resulting in lower radiation efficiency for antenna 70.

[0048] To solve the above problems, the present invention provides a battery cover assembly 23, which can be applied to the above electronic device 01. Figure 4 As shown, Figure 4 This is a schematic cross-sectional view of a partial structure of a battery cover assembly 23 provided in an embodiment of the present application (parallel to the YZ plane). The battery cover assembly 23 may include a battery cover body 231 , a first radiator 232 , and a second radiator 233 .

[0049] Specifically, the battery cover body 231 has a first surface 231a and a second surface 231b that are opposite to each other. The battery cover body 231 is made of at least one of aluminum alloy, stainless steel, plastic, ceramic, and glass.

[0050] It is understood that when the battery cover body 231 is made of metal, since the battery cover body 231 is electrically conductive and has good thermal conductivity, an insulating foam is applied to the first surface 231a of the battery cover body 231 to separate the battery cover body 231 from the electronic components within the electronic device 01 and prevent short circuits in the electronic components. Furthermore, the insulating foam can promptly transfer heat generated during the operation of the electronic components to the battery cover body 231, which then dissipates the heat from the battery cover body 231 to the surrounding environment in the form of thermal radiation.

[0051] When the battery cover body 231 is made of a transparent non-metallic material, in order to shield the internal structure of the electronic device 01 and beautify the battery cover body 231, an ink layer or a decorative film layer with a specific pattern is attached to the first surface 231a of the battery cover body 231.

[0052] The foam, ink layer, decorative film layer, etc. mentioned above can all be referred to as the dielectric layer 237 . The dielectric layer 237 and the battery cover body 231 can be regarded as an integral battery cover.

[0053] Please continue to see Figure 4 As shown, the first radiator 232 and the second radiator 233 are arranged on the first surface 231a, the first radiator 232 is arranged between the second radiator 233 and the first surface 231a, and the second radiator 233 is provided with a feeding point 233a ( Figure 4 (not shown), the second radiator 233 is used to couple signals to the first radiator 232.

[0054] It is understandable that the first radiator 232 and the second radiator 233 can be directly coupled or indirectly coupled, as long as the second radiator 233 can couple the signal to the first radiator 232. This application does not impose any special restrictions on this. For example, Figure 4 The middle battery cover assembly 23 further includes a conductive post 236 , which is disposed between the first radiator 232 and the second radiator 233 . One end of the conductive post 236 is coupled to the first radiator 232 , and the other end of the conductive post 236 is coupled to the second radiator 233 .

[0055] The above-mentioned first radiator 232 is arranged between the second radiator 233 and the first surface 231a, which means that the first radiator 232 is arranged between the dielectric layer 237 and the first surface 231a, and the second radiator 233 is arranged on the side of the dielectric layer 237 away from the battery cover body 231. In other words, the battery cover body 231, the first radiator 232, the dielectric layer 237 and the second radiator 233 are distributed along the thickness direction of the battery cover body 231 (parallel to the Z axis). In particular, in the thickness direction of the battery cover body 231 (parallel to the Z axis), the first radiator 232 and the second radiator 233 can be arranged in an overlapping manner (that is, the projection of the first radiator 232 on the first surface 231a and the projection of the second radiator 233 on the first surface 231a partially overlap or completely overlap), and the first radiator 232 and the second radiator 233 can also not overlap (that is, the projection of the first radiator 232 on the first surface 231a and the projection of the second radiator 233 on the first surface 231a are separated or only overlap at the edges). This application does not impose any special restrictions on this.

[0056] The first radiator 232 and the second radiator 233 constitute the radiating unit of the antenna 70, which can be applied to the above-mentioned antenna 70. The antenna 70 may include multiple radiating units, and the feeding points 233a of the second radiators 233 of the multiple radiating units are all connected to the transmission line 73 ( Figure 4 not shown).

[0057] Please continue to see Figure 4 As shown, the battery cover assembly 23 may further include a grounding layer 238, which is disposed on the battery cover body 231. The grounding layer 238 is connected to the grounding point 233b ( Figure 4 (not shown). In this way, the grounding point 233b of the second radiator 233 is coupled to the ground layer 238. That is, the radiating unit formed by the second radiator 233 and the first radiator 232 is coupled to the ground layer 238, ensuring the stability of the antenna signal transmitted by the radiating unit. The grounding point 233b of the second radiator 233 and the feeding point 233a can be spaced apart or overlapped. This is not specifically limited in this application.

[0058] Furthermore, the grounding layer 238 can be arranged on the same layer as the second radiator 233, that is, the grounding layer 238 and the second radiator 233 are arranged together on the side of the dielectric layer 237 away from the battery cover body 231. In this way, the grounding layer 238 is directly coupled with the grounding point 233b of the second radiator 233 without the need to open a hole in the dielectric layer 237, which is more convenient for production and processing and helps to reduce production costs.

[0059] For example, Figure 4In the figure, the first radiator 232 and the second radiator 233 are distributed on both sides of the dielectric layer 237 along the Z-axis direction, and the ground layer 238 and the second radiator 233 are located on the same side of the dielectric layer 237. In order to minimize the area occupied by the radiation unit composed of the first radiator 232 and the second radiator 233 on the battery cover body 231, the projection of the first radiator 232 on the first surface 231a completely overlaps with the projection of the second radiator 233 on the first surface 231a.

[0060] And, in Figure 4 In the illustrated orientation, the conductive post 236 is connected between the right end of the first radiator 232 and the right end of the second radiator 233. This means that the radiating unit formed by the first and second radiators 232, 233 has a U-shaped cross-section. The feed point 233a of the second radiator 233 is located at its left end. With this structure, the radiating unit formed by the first and second radiators 232, 233, and the conductive post 236 can be bent from a single, large radiator, making it easier to manufacture and processing, thereby reducing production costs.

[0061] In the battery cover assembly 23 provided in the present application, the radiation unit composed of the first radiator 232 and the second radiator 233 has a double-layer structure in the thickness direction of the battery cover body 231 (parallel to the Z axis), which is equivalent to arranging the first radiator 232 inside the battery cover composed of the battery cover body 231 and the dielectric layer 237. Compared with the method of arranging the radiation unit as a whole on the inner surface of the battery cover (that is, the surface of the dielectric layer 237 away from the battery cover body 231), the above structure increases the distance between the first radiator 232 and the floor 41, that is, increases the clearance of the first radiator 232, and can also improve the radiation efficiency of the antenna 70 to a certain extent.

[0062] For example, see Figure 5 As shown, Figure 5 This is a schematic cross-sectional view (parallel to the YZ plane) of a partial structure of another battery cover assembly 23 provided in an embodiment of the present application. The first radiator 232 and the second radiator 233 are distributed on both sides of the dielectric layer 237 along the Z-axis direction, and the left half of the projection of the first radiator 232 on the first surface 231a does not overlap with the projection of the second radiator 233 on the first surface 231a, but is completely separated.

[0063] Specifically, in Figure 5 In the illustrated orientation, the conductive post 236 is vertically arranged and connected between the left end of the first radiator 232 and the right end of the second radiator 233. That is, the cross-section of the radiation unit composed of the first radiator 232 and the second radiator 233 is Z-shaped. The feeding point 233a of the second radiator 233 is located at its left end.

[0064] Figure 5 The structure shown in FIG can also change the electric field distribution in the battery cover body 231 and the dielectric layer 237 , increase the clearance of the first radiator 232 , and improve the radiation efficiency of the antenna 70 .

[0065] In some embodiments, the first radiator 232 and the second radiator 233 may each include a capacitor structure configured to radiate signals outward with the assistance of the floor 41 of the electronic device 01 .

[0066] It is understood that the above-mentioned capacitor structure can be a single capacitor (such as a parallel plate capacitor, an interdigital capacitor, etc.), or an equivalent capacitor composed of multiple capacitor elements, and this application does not impose any special restrictions on this. For ease of understanding, the following description uses the capacitor structure as a single interdigital capacitor as an example.

[0067] See Figure 6 and Figure 7 As shown, Figure 6 This is a schematic diagram of the three-dimensional structure of the first radiator 232 and the second radiator 233 provided in an embodiment of the present application. Figure 7 for Figure 6 A partial enlarged view of point A. The first radiator 232 and the second radiator 233 each include a first comb-shaped electrode 234 and a second comb-shaped electrode 235 that are disposed opposite to each other.

[0068] The first comb-shaped electrode 234 includes a first bus bar 2341 and a plurality of first electrode fingers 2342, which are arranged at intervals along the extension direction of the first bus bar 2341. The second comb-shaped electrode 235 includes a second bus bar 2351 and a plurality of second electrode fingers 2352, which are arranged at intervals along the extension direction of the second bus bar 2351. The second electrode fingers 2352 and the first electrode fingers 2342 are arranged alternately and at intervals. In this way, the inter-finger coupling between the first electrode fingers 2342 of the first comb-shaped electrode 234 and the second electrode fingers 2352 of the second comb electrode 235 generates a left-handed series capacitance effect.

[0069] Specifically, the first busbar 2341 extends along the Y-axis and has a first end and a second end disposed along the Y-axis. The second busbar 2351 extends along the Y-axis and has a first end and a second end disposed along the Y-axis. The feed point 233a and the ground point 233b of the second radiator 233 are located at the first end of the first busbar 2341. The second end of the first busbar 2341 of the second radiator 233 is coupled to the second end of the first busbar 2341 of the first radiator 232 via a conductive post 236, and the second end of the second busbar 2351 of the second radiator 233 is coupled to the second end of the second busbar 2351 of the first radiator 232 via another conductive post 236.

[0070] Furthermore, the first electrode finger 2342 of the first radiator 232 faces the first electrode finger 2342 of the second radiator 233, the second electrode finger 2352 of the first radiator 232 faces the second electrode finger 2352 of the second radiator 233, and the gaps between the first and second electrode fingers 2342, 2352 of the first radiator 232 face the gaps between the first and second electrode fingers 2342, 2352 of the second radiator 233. In this case, the radiating unit formed by the first and second radiators 232, 233 can be viewed as a large interdigital capacitor symmetrically bent along a bending axis parallel to the X-axis, with the bent portion of the busbar on the larger interdigital capacitor serving as the conductive pillar 236. This ensures that all the first and second electrode fingers 2342, 2352 of the first and second radiators 232, 233 are excited, maximizing the equivalent capacitance of the radiating unit formed by the first and second radiators 232, 233.

[0071] In some embodiments, see Figure 6 As shown, the battery cover assembly 23 may further include an inductor structure, through which the grounding point 233b of the second radiator 233 is coupled to the ground layer 238. In this way, the inductor structure can provide impedance matching for the antenna 70 to adjust the load power and suppress signal reflection.

[0072] It is understandable that the above-mentioned inductor structure can be a single inductor (such as an inductor line) or an equivalent inductor composed of multiple inductor elements, and this application does not impose any special restrictions on this. For example, Figure 6 The middle inductor structure is an inductor line 239 , one end of the inductor line 239 is connected to the ground layer 238 , the ground point 233 b of the second radiator 233 coincides with the feeding point 233 a , and the other end of the inductor line 239 is connected to the ground point 233 b of the second radiator 233 .

[0073] In actual applications, the various performance parameters of the radiation unit composed of the first radiator 232 and the second radiator 233 can be adjusted by changing the thickness, dielectric constant, loss tangent and other parameters of the battery cover body 231 and the dielectric layer 237, as well as changing the length of the first electrode finger 2342 and the second electrode finger 2352 and the length of the inductor line 239.

[0074] Please continue to see Figure 6 As shown, combined with Figure 8 As shown, Figure 8 for Figure 6 Schematic diagram of the cross-sectional dimensions of the middle battery cover assembly 23 (parallel to the YZ plane). The length of the first electrode finger 2342 along the X-axis ranges from 5 mm to 10 mm. For example, the length of the first electrode finger 2342 can be 5.0 mm, 6.3 mm, 7.2 mm, 8.3 mm, 9.0 mm, 10.0 mm, etc.

[0075] The length of the second electrode finger 2352 along the X-axis direction ranges from 5 mm to 10 mm. For example, the length of the second electrode finger 2352 can be 5.0 mm, 6.3 mm, 7.2 mm, 8.3 mm, 9.0 mm, 10.0 mm, etc.

[0076] The length of the inductor line 239 along the Y-axis direction ranges from 2 mm to 5 mm. For example, the length of the inductor line 239 can be 2.0 mm, 2.8 mm, 3.08 mm, 3.8 mm, 4.5 mm, 5.0 mm, etc.

[0077] The thickness D1 of the battery cover body 231 ranges from 0.3 mm to 1 mm. For example, D1 can be 0.30 mm, 0.42 mm, 0.50 mm, 0.55 mm, 0.70 mm, 0.88 mm, 1.0 mm, etc.

[0078] The dielectric constant of the battery cover body 231 ranges from 5 to 8. For example, the dielectric constant of the battery cover body 231 may be 5.0, 5.5, 6.2, 6.9, 7.0, 7.8, 8.0, and the like.

[0079] The loss tangent of the battery cover body 231 ranges from 0.001 to 0.02. For example, the loss tangent of the battery cover body 231 can be 0.001, 0.005, 0.01, 0.013, 0.018, 0.02, etc.

[0080] The thickness D2 of the dielectric layer 237 ranges from 0.05 mm to 0.5 mm. For example, D2 can be 0.05 mm, 0.08 mm, 0.1 mm, 0.25 mm, 0.30 mm, 0.38 mm, 0.45 mm, 0.50 mm, etc.

[0081] The dielectric constant of the dielectric layer 237 ranges from 1 to 5. For example, the dielectric constant of the dielectric layer 237 can be 1.0, 1.50, 2.20, 2.55, 2.98, 3.60, 4.20, 4.85, 5.0, etc.

[0082] The loss tangent of the dielectric layer 237 ranges from 0.01 to 0.2. For example, the loss tangent of the dielectric layer 237 can be 0.01, 0.025, 0.0345, 0.050, 0.0635, 0.0765, 0.0985, 0.120, 0.135, 0.168, 0.2, etc.

[0083] The distance H between the second radiator 233 and the floor 41 ranges from 0.1 mm to 0.5 mm. For example, H can be 0.1 mm, 0.15 mm, 0.20 mm, 0.35 mm, 0.5 mm, etc.

[0084] For example, Figure 6 and Figure 8 In the figure, the length of the first electrode finger 2342 along the X-axis is 7.2 mm, the length of the second electrode finger 2352 along the X-axis is 7.2 mm, and the length of the inductor line 239 along the Y-axis is 3.08 mm. The battery cover body 231 is made of glass. The thickness D1 of the battery cover body 231 is 0.55 mm, its dielectric constant is 7, and its loss tangent is 0.01. The thickness D2 of the dielectric layer 237 is 0.1 mm, its dielectric constant is 2.98, and its loss tangent is 0.0765. The distance H between the second radiator 233 and the floor 41 is 0.2 mm.

[0085] Based on this, Figure 6 The battery cover assembly 23 in the embodiment of the present application is used as the design structure provided by the embodiment, and the single-layer cross-finger capacitor (i.e., the aforementioned radiation element 72) is set on the side of the dielectric layer 237 away from the battery cover body 231 as the control structure (this schematic diagram is omitted, and in the control structure, except that the capacitor structure is a single-layer cross-finger capacitor, the other parameters are consistent with the design structure), and the two are analyzed and compared.

[0086] See Figure 9 、 Figure 10 、 Figure 11 and Figure 12 As shown, Figure 9 is a schematic diagram of the cross-sectional electric field vector within the battery cover body 231 in the control structure (parallel to the YZ plane), Figure 10 2 is a simulation diagram of the electric field inside the battery cover body 231 in the control structure. Figure 11 Schematic diagram of the cross-sectional electric field vector of the design structure provided in the embodiment of the present application (parallel to the YZ plane), Figure 12This is a simulation diagram of the electric field distribution of the design structure provided in the embodiment of the present application. Figure 9 and Figure 11 The straight arrows and curved arrows indicate the direction of the electric field. Figure 10 and Figure 12 In the figure, the darker the gray area, the higher the electric field strength.

[0087] By comparison Figure 9 and Figure 11 ,contrast Figure 10 and Figure 12 It can be seen that when the single-layer interdigital capacitor (i.e., radiating element 72) is placed on the side of the dielectric layer 237 facing away from the battery cover body 231, the area with a strong electric field strength within the dielectric layer 237 is large and continuous. However, when the double-layer interdigital capacitor structure consisting of the first radiator 232 and the second radiator 233 is placed on both sides of the dielectric layer 237, the area with a strong electric field strength within the dielectric layer 237 is smaller and discontinuous, and the electric field strength is significantly stronger in the portion of the battery cover body 231 opposite the first radiator 232.

[0088] That is to say, the radiating unit (double-layer interdigital capacitor structure) provided in the present application, which is composed of the first radiator 232 and the second radiator 233, has strong coupling between the electrode fingers, which can change the electric field distribution in the dielectric layer 237 and the battery cover body 231, so that part of the radiation energy can be effectively guided into the battery cover body 231 with a smaller loss tangent, thereby realizing the redistribution of the metal loss and dielectric loss of the antenna 70, which is beneficial to improving the radiation efficiency of the antenna 70.

[0089] See Figure 13 As shown, Figure 13 Schematic diagram of the S11 curves for a control structure and a design structure provided in an embodiment of the present application. The horizontal axis represents frequency, and the vertical axis represents the S parameter. The solid line represents the S11 curve for the design structure, and the dashed line represents the S11 curve for the control structure.

[0090] from Figure 13 The operating frequency range of the designed structure can be selected as the frequency range between the two lowest points of the S11 curve. Within this frequency range, the return loss of antenna 70 is minimized. In other words, the operating frequency range of first radiator 232 and second radiator 233 in the designed structure is 3.3 GHz to 3.6 GHz. Furthermore, the operating frequency range of antenna 70 in the designed structure is well aligned with the fast-wave region of the array element, maintaining a left-hand and right-hand balance.

[0091] See Figure 14 As shown, Figure 14Schematic diagram of the radiation efficiency simulation for a control structure and the design structure provided by an embodiment of the present application. The horizontal axis represents frequency, and the vertical axis represents radiation efficiency. The solid line represents the radiation efficiency of the design structure, and the dashed line represents the radiation efficiency of the control structure.

[0092] from Figure 14 It can be seen that the radiation efficiency of the design structure provided in the embodiment of the present application at all frequency points within its operating frequency band (3.3 GHz to 3.6 GHz) is significantly higher than that of the control structure.

[0093] See Figure 15 and Figure 16 As shown, Figure 15 Schematic diagram of metal loss simulation for a control structure and a design structure provided by an embodiment of the present application. The horizontal axis represents frequency, and the vertical axis represents the metal loss percentage. The solid line represents the metal loss of the design structure, and the dashed line represents the metal loss of the control structure. Figure 16 Schematic diagram of dielectric loss simulation for a control structure and a design structure provided by an embodiment of this application. The horizontal axis represents frequency, and the vertical axis represents dielectric loss percentage. The solid line represents the dielectric loss curve for the design structure, and the dashed line represents the dielectric loss curve for the control structure.

[0094] pass Figure 15 and Figure 16 , and combined with Figure 12 From the simulation results, it can be seen that the first radiator 232 and the second radiator 233 adopt a double-layer interdigital capacitor structure design, which can guide part of the energy into the battery cover body 231 with a smaller loss tangent, thereby significantly reducing the dielectric loss. Specifically, the dielectric loss of the design structure at all frequency points within its operating frequency band (3.3GHz~3.6GHz) is significantly smaller than that of the control structure, which is only about 0.5 times that of the control structure. The metal loss of the design structure increases significantly only at a few frequency points, but the total metal loss is still reduced. In the process of structural design, such as Figure 6 As shown in the structural parameters, after the first radiator 232 and the second radiator 233 form a double-layer interdigital capacitor structure, the series capacitance effect in the equivalent circuit remains unchanged, and the parallel capacitance effect is weakened due to the change in energy distribution. Therefore, it is necessary to appropriately increase the parallel inductance effect to ensure that the resonant frequency of the parallel branch remains unchanged, which is manifested as an increase in the length of the inductor line 239. This is to make Figure 15 The reasons for the increase in metal loss in the designed structure are analyzed and the results are reasonable.

[0095] Since the battery cover body 231 is made of metal, the battery cover body 231 may produce an electromagnetic shielding effect on the first radiator 232 and the second radiator 233, thereby adversely affecting the transmission and reception of antenna signals. Figure 17 As shown, Figure 17This is a schematic cross-sectional view (parallel to the YZ plane) of a partial structure of another battery cover assembly 23 provided in an embodiment of the present application.

[0096] The battery cover body 231 is provided with a radiation window 2310 , which penetrates the battery cover body 231 along the thickness direction of the battery cover body 231 (parallel to the Z axis) and faces the radiation unit composed of the first radiator 232 and the second radiator 233 .

[0097] In this way, by opening a radiation window 2310 on the battery cover body 231 at a position opposite to the first radiator 232 and / or the second radiator 233, the battery cover body 231 can be prevented from forming electromagnetic shielding on the first radiator 232 and the second radiator 233, thereby ensuring that the first radiator 232 and the second radiator 233 can normally send and receive antenna signals.

[0098] It is understood that the projections of the first radiator 232 and the second radiator 233 on the first surface 231a of the battery cover body 231 may be partially or entirely located within the radiation window 2310, and this application does not impose any specific limitations on this. Furthermore, when the projections of the first radiator 232 and the second radiator 233 on the first surface 231a of the battery cover body 231 are entirely located within the radiation window 2310, the radiation unit is minimally affected by the metal battery cover body 231.

[0099] Further, see Figure 18 As shown, Figure 18 A schematic cross-sectional view (parallel to the YZ plane) of a partial structure of another battery cover assembly 23 provided in an embodiment of the present application is shown. The battery cover assembly 23 may further include a blocking member 24 , which is filled in the radiation window 2310 and is an insulator.

[0100] Sealing member 24 blocks radiation window 2310, preventing foreign matter (such as moisture, grease, and dust) from entering electronic device 01 through radiation window 2310. Sealing member 24 also fills radiation window 2310, further enhancing the appearance of battery cover body 231. Furthermore, because sealing member 24 is an insulator, it does not provide electromagnetic shielding for first radiator 232 and second radiator 233.

[0101] Exemplarily, the material of the blocking member 24 can be rubber, silicone, plastic, etc., so that it can be directly filled into the radiation window 2310 by injection molding.

[0102] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0103] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A battery cover assembly, characterized in that: include: A battery cover body, the battery cover body having a first surface and a second surface arranged opposite to each other; A first radiator and a second radiator, wherein the first radiator and the second radiator are arranged on the first surface, the first radiator is arranged between the second radiator and the first surface, a feeding point is arranged on the second radiator, and the second radiator is used to couple a signal to the first radiator.

2. The battery cover assembly according to claim 1, characterized in that: A projection of the first radiator on the first surface at least partially overlaps with a projection of the second radiator on the first surface.

3. The battery cover assembly according to claim 1, characterized in that: The first radiator and the second radiator each include a capacitor structure, and the capacitor structure is configured to radiate a signal outward with the assistance of a floor of the electronic device.

4. The battery cover assembly according to claim 3, characterized in that: The capacitor structure includes a first comb-shaped electrode and a second comb-shaped electrode arranged opposite to each other; the first comb-shaped electrode includes a first bus bar and a plurality of first electrode fingers, and the plurality of first electrode fingers are arranged at intervals along the extension direction of the first bus bar; the second comb-shaped electrode includes a second bus bar and a plurality of second electrode fingers, and the plurality of second electrode fingers are arranged at intervals along the extension direction of the second bus bar, and the second electrode fingers and the first electrode fingers are arranged at intervals and alternately.

5. The battery cover assembly according to any one of claims 1 to 4, characterized in that: The battery cover assembly further includes a conductive column, which is disposed between the first radiator and the second radiator, one end of the conductive column is coupled to the first radiator, and the other end of the conductive column is coupled to the second radiator.

6. The battery cover assembly according to any one of claims 1 to 4, characterized in that: The battery cover assembly further includes a dielectric layer, the dielectric layer is attached to the first surface, the first radiator is arranged between the dielectric layer and the first surface, and the second radiator is arranged on a side of the dielectric layer away from the battery cover body.

7. The battery cover assembly according to any one of claims 1 to 4, characterized in that: The battery cover assembly further includes a grounding layer, which is disposed on the battery cover body and is coupled to a grounding point of the second radiator.

8. The battery cover assembly according to claim 7, characterized in that: The ground layer and the second radiator are arranged on the same layer.

9. The battery cover assembly according to claim 7, characterized in that: The battery cover assembly further includes an inductor structure, and the grounding point of the second radiator is coupled to the grounding layer through the inductor structure.

10. The battery cover assembly according to claim 9, characterized in that: The inductor structure includes an inductor line, one end of the inductor line is coupled to the ground layer, and the other end of the inductor line is coupled to the ground point of the second radiator.

11. The battery cover assembly according to any one of claims 1 to 4, characterized in that: The battery cover body is an insulator.

12. The battery cover assembly according to any one of claims 1 to 4, characterized in that: The battery cover body is a conductor, and a radiation window is provided on the battery cover body. The radiation window penetrates the battery cover body along the thickness direction of the battery cover body, and the radiation window faces the first radiator and / or the second radiator.

13. The battery cover assembly according to any one of claims 1 to 4, characterized in that: The operating frequency band of the first radiator and the second radiator is 3.3 GHz to 3.6 GHz.

14. An electronic device, characterized in that: include: A middle frame, wherein the middle frame is configured to enclose a containing space; A main board, the main board is arranged in the accommodating space, and a floor is arranged on the main board; The battery cover assembly according to any one of claims 1 to 13, wherein the battery cover body covers one side of the middle frame; The first radiator and the second radiator are located between the battery cover body and the floor, and the floor is used to assist the first radiator and the second radiator in transmitting signals.

Images