Battery cover assembly and electronic device

Abstract

This application provides a battery cover assembly and an electronic device, relating to the field of antenna technology. The battery cover assembly provided by this application includes a battery cover body, a first radiator, and a second radiator. The battery cover body has a first surface and a second surface disposed opposite to each other. The first radiator and the second radiator are disposed on the first surface, with the first radiator positioned between the second radiator and the first surface. The second radiator has a feed point and is used to couple signals to the first radiator. The aforementioned first and second radiators constitute the radiating element of a traveling wave antenna. By positioning the first radiator between the second radiator and the first surface, the distance between the first radiator and the ground plane of the electronic device is increased, thereby increasing the clearance of the first radiator and improving the radiation efficiency of the traveling wave antenna.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and more particularly to a battery cover assembly and an electronic device. Background Technology

[0002] Antennas are an indispensable component of electronic devices, and their bandwidth and radiation efficiency directly affect the communication quality of these devices. With the development of communication technology and electronic devices, higher demands 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 bezel antennas and traveling-wave antennas on the back cover. Among them, traveling-wave antennas refer to antennas in which the fed electromagnetic field is distributed in a traveling wave pattern. Traveling-wave antennas on the back cover of mobile phones are mainly 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 ground is relatively small, that is, the distance between the traveling-wave antenna and the ground is relatively small, resulting in low radiation efficiency of the traveling-wave antenna. Summary of the Invention

[0004] This application provides a battery cover assembly and an electronic device to address the problem of low radiation efficiency of traveling wave antennas in existing electronic devices.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a battery cover assembly, which includes a battery cover body, a first radiator, and a second radiator.

[0007] The battery cover body has a first surface and a second surface that are disposed opposite to each other. A first radiator and a second radiator are disposed on the first surface, with the first radiator positioned between the second radiator and the first surface. The second radiator has a feed point and is used to couple signals to the first radiator.

[0008] The battery cover assembly provided in the first aspect of this application can feed power to the second radiator through a feed point. That is, the radio frequency signal of the radio frequency transceiver circuit can be fed into the second radiator through the feed point, and then coupled from the second radiator to the first radiator. The first and second radiators constitute 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.

[0009] 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. This overlap reduces the area occupied by the radiating elements (the first and second radiators) on the battery cover body, allowing for the arrangement of more radiating elements on the battery cover body, which is beneficial for improving the gain of the traveling wave antenna.

[0010] In conjunction with the first aspect, in another possible implementation, both the first and second radiators include capacitor structures configured to radiate signals outward with the assistance of the electronic device's floor. In this way, both the first and second radiators include capacitor structures that can modulate the effective refractive index of the guided wave, thereby changing the beam's radiation angle and achieving beam control.

[0011] In conjunction with the first aspect, in another possible implementation, 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 busbar and a plurality of first electrode fingers, which are spaced apart along the extension direction of the first busbar; the second comb-shaped electrode includes a second busbar and a plurality of second electrode fingers, which are spaced apart along the extension direction of the second busbar, and the second electrode fingers and the first electrode fingers are spaced apart and alternately arranged. In this way, both the first radiator and the second radiator are interdigitated capacitor structures, and the interdigital coupling between the first electrode fingers of the first comb-shaped electrode and the second electrode fingers of the second comb-shaped electrode can generate a left-handed series capacitance effect.

[0012] 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. One end of the conductive post is coupled to the first radiator, and the other end is coupled to the second radiator. In this way, the first and second radiators are directly coupled through the conductive post, resulting in a radiating unit composed of the first and second radiators exhibiting excellent low-frequency characteristics, higher stability, and lower noise. The conductive post can be integrally formed with the first and second radiators, or it can be a separate component coupled to the first and second radiators via welding, plugging, or other methods.

[0013] In conjunction with the first aspect, in another possible implementation, the battery cover assembly further includes a dielectric layer attached to a first surface of the battery cover body. A first radiator is disposed between the dielectric layer and the first surface, and a second radiator is disposed on the side of the dielectric layer facing away from the battery cover body. The dielectric layer is generally used for decoration, cushioning, 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 considered as a single battery cover, the above structure is equivalent to placing the first radiator inside the battery cover. Compared to placing both the first and second radiators 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 ground plane on the motherboard, thus increasing the clearance of the first radiator and improving its radiation efficiency.

[0014] In conjunction with the first aspect, in another possible implementation, the battery cover assembly further includes a grounding layer disposed on the battery cover body, and coupled to the grounding point of the second radiator. In this way, the coupling of the grounding point of the second radiator with the grounding layer, i.e., the coupling of the radiating element composed of the second and first radiators with the grounding layer, ensures the stability of the antenna signal transmitted on the radiating element. The grounding point and the feed point of the second radiator can be spaced apart or coincident.

[0015] In conjunction with the first aspect, another possible implementation involves the grounding layer and the second radiator being disposed on the same layer. This means that both the grounding layer and the second radiator are disposed on the first surface of the battery cover body, or both are disposed on the side of the dielectric layer facing away from the battery cover body. This facilitates direct coupling between the grounding points of the grounding layer and the second radiator without requiring holes in the dielectric layer, simplifying manufacturing and reducing production costs.

[0016] In conjunction with the first aspect, in another possible implementation, the battery cover assembly also includes an inductor structure, through which the grounding point of the second radiator is coupled to the ground plane. This allows the inductor structure to provide impedance matching for the antenna, adjusting load power and suppressing signal reflections. The inductor structure can be a single inductor or an equivalent inductance composed of multiple components.

[0017] In conjunction with the first aspect, in another possible implementation, the inductor structure includes an inductor wire, one end of which is coupled to a ground plane, and the other end of which is coupled to the grounding point of the second radiator. The inductor wire exhibits high stability and reliability, and has good frequency characteristics, which is beneficial for improving the antenna's sensitivity.

[0018] In conjunction with the first aspect, in another possible implementation, the battery cover body is an insulator. In this case, with the battery cover body being an insulator, the battery cover will not provide electromagnetic shielding for the first and second radiators, thus not affecting the normal transmission and reception of antenna signals by the first and second radiators.

[0019] 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 its thickness direction and faces the first radiator and / or the second radiator. Since the battery cover body is a conductor, it will provide electromagnetic shielding to the first and second radiators. Therefore, by opening a radiation window on the battery cover body at a position opposite to the first and / or second radiators, it is possible to avoid the battery cover body forming electromagnetic shielding to the first and second radiators, ensuring that the first and second radiators can normally transmit and receive antenna signals.

[0020] In conjunction with the first aspect, in another possible implementation, the battery cover assembly also includes a sealing element that fills the radiating window, and the sealing element is an insulator. In this way, the sealing element can block the radiating window, preventing foreign objects (such as moisture, grease, dust, etc.) from entering the electronic device through the radiating window, and the sealing element filling the radiating window makes the shape of the battery cover body smoother and more aesthetically pleasing. Furthermore, since the sealing element is an insulator, it does not provide electromagnetic shielding for the first and second radiators.

[0021] In conjunction with the first aspect, in another possible implementation, the first radiator and the second radiator operate in the frequency band of 3.3 GHz to 3.6 GHz. That is, the radiating unit composed of the first radiator and the second radiator in the battery cover assembly provided in this application can be used for 5G mid-band communication.

[0022] Secondly, this application provides an electronic device including a mid-frame, a motherboard, and the battery cover assembly described in the first aspect. The mid-frame encloses an accommodating space, the motherboard is disposed within the accommodating space, and a floor is provided on the motherboard. The battery cover body covers one side of the mid-frame, and a first radiator and a second radiator are located between the battery cover body and the floor, the floor serving to assist the first radiator and the second radiator in transmitting signals.

[0023] It is understood that the beneficial effects that the electronic device described in the second aspect and any possible implementation thereof can be referred to as the beneficial effects in the first aspect and any possible implementation thereof, and will not be repeated here. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the electronic device provided in the embodiments of this application;

[0025] Figure 2 For the above Figure 1 Exploded view of the structure of electronic equipment in China;

[0026] Figure 3 for Figure 1 A schematic diagram of a partial structural cross-section of an electronic device;

[0027] Figure 4 A partial structural cross-sectional schematic diagram of a battery cover assembly provided in an embodiment of this application;

[0028] Figure 5 A partial cross-sectional schematic diagram of another battery cover assembly provided in an embodiment of this application;

[0029] Figure 6 A three-dimensional structural diagram of the first radiator and the second radiator provided in the embodiments of this application;

[0030] Figure 7 for Figure 6 A magnified view of a section at point A in the middle;

[0031] Figure 8 for Figure 6 Schematic diagram of the cross-sectional dimensions of the battery cover assembly;

[0032] Figure 9 This is a schematic diagram of the cross-sectional electric field vector within the battery cover body of the comparison structure;

[0033] Figure 10 The above is a simulation diagram of the electric field inside the battery cover body in the comparison structure;

[0034] Figure 11 A schematic diagram of the cross-sectional electric field vector of the design structure provided in the embodiments of this application;

[0035] Figure 12 Simulation diagram of electric field distribution of the design structure provided in the embodiments of this application;

[0036] Figure 13 A schematic diagram of the S11 curve for comparison with the design structure provided in the embodiments of this application;

[0037] Figure 14 A simulation diagram illustrating the radiation efficiency of the design structure provided in the comparison structure and the embodiments of this application;

[0038] Figure 15 A simulation diagram of metal loss for the comparative structure and the design structure provided in the embodiments of this application;

[0039] Figure 16A simulation diagram of dielectric loss for the comparative structure and the design structure provided in the embodiments of this application;

[0040] Figure 17 A partial cross-sectional schematic diagram of another battery cover assembly provided in an embodiment of this application;

[0041] Figure 18 This is a partial structural cross-sectional schematic diagram of another battery cover assembly provided in an embodiment of this application.

[0042] Figure label:

[0043] 01. Electronic device; 10. Display module; 11. Light-transmitting cover; 12. Display screen; 20. Housing; 21. Mid-frame; 211. Bezel; 212. Mid-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. Feed point; 233b. Grounding point; 234. First comb-shaped electrode; 2341, First busbar; 2342, First electrode finger; 235, Second comb electrode; 2351, Second busbar; 2352, Second electrode finger; 236, Conductive post; 237, Dielectric layer; 238, Ground layer; 239, Inductor; 24, Sealing component; 30, Camera module; 40, Motherboard; 41, Floor; 50, Camera decorative cover; 60, Battery; 70, Antenna; 71, RF transceiver circuit; 72, Radiating component; 73, Transmission line. Detailed Implementation

[0044] To make the purpose, technical solution, and advantages of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0045] In the description of this application, it should be clarified that the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," and "horizontal," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are merely for the convenience of describing this application, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this application. Similarly, the term "quantity" should not be construed as a limitation of this application.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] For ease of understanding, the technical terms used in this application will be explained and described below.

[0048] Coupling: Coupling can be understood as direct coupling and / or indirect coupling. "Direct coupling," also known as "electrical connection," can be understood as the physical contact and electrical conduction of components; it can also be understood as the connection between different components in a circuit structure through physical lines such as copper foil or wires on a printed circuit board (PCB) that can transmit electrical signals. "Indirect coupling" can be understood as two conductors conducting electricity through a gap or without contact. Indirect coupling can also be called capacitive coupling, for example, using the coupling between two conductive parts to form an equivalent capacitance to achieve signal transmission.

[0049] Traveling wave: A traveling wave is a plane wave that propagates along a transmission line. Its amplitude changes exponentially along the direction of propagation, while its phase changes linearly along the transmission line.

[0050] Leaky wave antenna: When an electromagnetic wave propagates along a traveling wave structure, if it continuously radiates along this structure, the radiated wave is called a leaky wave, and correspondingly, the structure that generates the leaky wave is called a leaky wave antenna. A leaky wave antenna is a type of traveling wave antenna (i.e., an antenna in which the fed electromagnetic field exhibits a traveling wave distribution).

[0051] Composite right / left-handed transmission line (CRLH-TL): The composite right / left-handed transmission line is an artificial electromagnetic material structure with left-handed and right-handed characteristics. It has the characteristics of being able to realize left-handed and right-handed wave propagation, realizing negative refractive index, and realizing broadband harmonic suppression.

[0052] This application provides an electronic device 01. Specifically, the electronic device 01 can be a portable electronic device or other types of electronic devices. For example, the electronic device can be a mobile phone, a tablet personal computer, a personal digital assistant (PDA), a wearable device, etc. For ease of explanation, the following description uses a mobile phone as an example for the electronic device 01.

[0053] Please 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 the embodiments of this application. Figure 2 For the above Figure 1 An exploded view of the structure of electronic device 01. As described above, in this embodiment, electronic device 01 is a mobile phone, and electronic device 01 can have an approximately rectangular plate-like structure. Electronic device 01 may include a display module 10, a housing 20, a camera module 30, a motherboard 40, a camera decorative cover 50, a battery 60, and an antenna 70.

[0054] For ease of description below, an XYZ coordinate system is established, defining the width direction of electronic device 01 as the X-axis, the length direction of electronic device 01 as the Y-axis, and the thickness direction of electronic device 01 as the Z-axis. It can be understood that... Figure 1 and Figure 2 The electronic device 01 is shown only schematically, and the actual shape, size, location, and construction of these components are not subject to change. Figure 1 and Figure 2 Restrictions.

[0055] The aforementioned display module 10 is used to display images, videos, etc. The display module 10 may include a light-transmitting cover 11 and a display screen 12 (also called a display panel), with the light-transmitting cover 11 and the display screen 12 stacked together. The material of the light-transmitting cover 11 includes, but is not limited to, glass. For example, the light-transmitting cover 11 can be a common light-transmitting cover to protect the display screen from damage caused by external forces and to provide dust protection. Alternatively, the light-transmitting cover 11 can also be a touch-sensitive cover to enable the electronic device 01 to have touch functionality, thereby making it more convenient for the user. Therefore, this application does not specifically limit the material of the light-transmitting cover 11.

[0056] Furthermore, the aforementioned display screen 12 can be a flexible display screen or a rigid display screen. For example, the display screen 12 can be an organic light-emitting diode panel (OLED), an active-matrix organic light-emitting diode panel (AMOLED), a mini organic light-emitting diode panel, a micro light-emitting diode panel, a micro organic light-emitting diode panel, a quantum dot light-emitting diode panel (QLED), or a liquid crystal display panel (LCD).

[0057] The aforementioned 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 rear cover 22. The rear 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 rear cover 22, and both the light-transmitting cover plate 11 and the rear cover 22 are fixed to the middle frame 21. For example, the rear cover 22 can be fixed to the middle frame 21 by means of adhesive, threaded connection, welding, snap-fit, etc. The light-transmitting cover plate 11 can be fixed to the middle frame 21 by adhesive, so that the light-transmitting cover plate 11, the rear cover 22 and the middle frame 21 form an internal accommodating space for the electronic device 01. The aforementioned display screen 12, motherboard 40, camera module 30 and antenna 70 are all disposed within this internal accommodating space.

[0058] In some embodiments, the aforementioned middle frame 21 may include a side frame 211 and a middle plate 212. The side frame 211 is arranged around the middle plate 212, and the middle plate 212 is fixedly connected to the side frame 211. For example, the middle plate 212 and the side frame 211 can be fixedly connected by means of adhesive, threaded connection, welding, snap-fit, etc. Alternatively, the middle plate 212 and the side frame 211 may also be an integrally formed structure, that is, the middle plate 212 and the side frame 211 form a whole structural component, and there is no dividing layer between the middle plate 212 and the side frame 211. The integrally formed structure is more robust and sturdy than the split structure, and is also easier to assemble.

[0059] The middle plate 212 is located on the side of the display screen 12 away from the light-transmitting cover plate 11. The middle plate 212 divides the aforementioned accommodating space into two independent spaces. One space is located between the light-transmitting cover plate 11 and the middle plate 212, and the display screen 12 is located in this space. The other space is located between the middle plate 212 and the rear cover 22, and the aforementioned motherboard 40, camera module 30, battery 60, and antenna 70 are all located in this space.

[0060] The aforementioned camera module 30 is used to capture video or images and can achieve autofocus (AF), thus making it suitable for various shooting scenarios. The aforementioned camera module 30 can be used as follows... Figure 2 The camera module 30 is positioned near one edge of the back cover 22. Alternatively, it can be located in the upper center of the back cover 22. Figure 2 (Not shown in the image). Therefore, this application does not specifically limit the location of the camera module 30. The aforementioned camera decorative cover 50 is used to prevent external dust and other foreign objects from entering the electronic device 01 or the camera module 30, and to prevent the camera module 30 from being scratched or impacted by external objects.

[0061] The aforementioned motherboard 40 is used to house the electronic components of the electronic device 01 and to establish electrical connections between these components. Exemplarily, these electronic components can be control chips (e.g., system-on-chip, SOC), graphics processing units (GPUs), universal flash storage (UFS), earpieces, flash modules, resistors, capacitors, inductors, etc. The motherboard 40 has a ground plane 41, which is electrically connected to the mid-frame 21. The ground plane 41 is used to ground various electronic components and circuits within the electronic device 01. It is understood that the ground plane 41 can be separately located on a circuit board on one side of the motherboard 40, or it can be a metal layer integrated onto the motherboard 40. The following description assumes the ground plane 41 is integrated onto the motherboard 40.

[0062] The antenna 70 described above is used to receive and transmit antenna signals. For example, the antenna 70 can be a traveling wave antenna or a standing wave antenna. The following embodiments are described using the antenna 70 as a leaky wave antenna (a type of traveling wave antenna).

[0063] 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 transmit radio frequency signals to the radiating element 72. The radio frequency transceiver circuit 71 may be integrated into the radio frequency transceiver chip or the central processing unit of the electronic device 01. Alternatively, the radio frequency transceiver circuit 71 may be separately located on the motherboard 40.

[0064] The radiating element 72 is disposed on the inner surface of the rear cover 22. The radiating element 72 is used to receive radio frequency signals from the radio frequency transceiver circuit 71 and transmit antenna signals to the outside of the electronic device 01. Alternatively, the radiating element 72 can also be used to receive antenna signals from outside the electronic device 01 and transmit them to the radio frequency transceiver circuit 71. The radio frequency transceiver circuit 71 and the radiating element 72 can be connected via a transmission line 73, allowing radio frequency signals to be directly transmitted to the radiating element 72 via the transmission line 73. The position on the radiating element 72 that contacts the transmission line 73 is the feed point. Multiple radiating elements 72 can be provided, and the feed points of multiple radiating elements 72 are all connected to the transmission line 73. For example, the transmission line 73 can be a composite left-hand / right-hand transmission line.

[0065] In some embodiments, an RF front-end may be provided between the radiating element 72 and the RF transceiver circuit 71, and the RF front-end is located on the motherboard 40. The RF front-end may include components such as an antenna switch (for switching between RF signal reception and transmission), a power amplifier (for amplifying the RF signal of the transmission channel), a low-noise amplifier (for amplifying the RF signal of the reception channel), and a filter (for retaining signals within a specific frequency band and filtering out signals outside the specific frequency band).

[0066] Please see Figure 3 As shown, Figure 3 for Figure 1 A partial cross-sectional view of the electronic device 01 (parallel to the YZ plane). Since the radiating element 72 is generally located on the inner surface of the back cover 22, and the back cover 22 is positioned opposite to the motherboard 40, and because the thickness of the electronic device 01 is getting smaller and smaller, the distance between the radiating element 72 and the ground plane 41 on the motherboard 40 is smaller, that is, the clearance of the radiating element 72 is smaller, which in turn leads to the lower radiation efficiency of the antenna 70.

[0067] To address the aforementioned problems, this application provides a battery cover assembly 23, which can be applied to the aforementioned electronic device 01. Please refer to... Figure 4 As shown, Figure 4 This is a partial cross-sectional view (parallel to the YZ plane) of a battery cover assembly 23 provided in an embodiment of this application. The battery cover assembly 23 may include a battery cover body 231, a first radiator 232, and a second radiator 233.

[0068] Specifically, the battery cover body 231 has a first surface 231a and a second surface 231b disposed opposite to each other. The battery cover body 231 is made of at least one of aluminum alloy, stainless steel, plastic, ceramic, and glass.

[0069] Understandably, when the battery cover body 231 is made of metal, due to its electrical conductivity and good thermal conductivity, insulating foam is attached to the first surface 231a of the battery cover body 231 to separate the battery cover body 231 from the electronic components inside the electronic device 01, thus preventing short circuits. Furthermore, the insulating foam can also conduct the heat generated during the operation of the electronic components to the battery cover body 231 in a timely manner, and then dissipate it into the surrounding environment through thermal radiation.

[0070] When the battery cover body 231 is made of transparent non-metallic material, in order to cover the internal structure of the electronic device 01 and to beautify and decorate the battery cover body 231, an ink layer or decorative film layer with a specific pattern will be applied to the first surface 231a of the battery cover body 231.

[0071] The foam, ink layer, decorative film layer, etc. mentioned above can all be referred to as dielectric layer 237. Dielectric layer 237 and battery cover body 231 can be regarded as an integral battery cover.

[0072] Please continue reading Figure 4 As shown, a first radiator 232 and a second radiator 233 are disposed on a first surface 231a, with the first radiator 232 positioned between the second radiator 233 and the first surface 231a. A feed point 233a is disposed on the second radiator 233. Figure 4 (not shown in the image), the second radiator 233 is used to couple signals to the first radiator 232.

[0073] It is understood 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 limitations in this regard. For example, Figure 4 The battery cover assembly 23 also 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.

[0074] The first radiator 232 being disposed between the second radiator 233 and the first surface 231a means that the first radiator 232 is disposed between the dielectric layer 237 and the first surface 231a, and the second radiator 233 is disposed on the side of the dielectric layer 237 away from the battery cover body 231. That is to say, 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 the thickness direction (parallel to the Z-axis) of the battery cover body 231, the first radiator 232 and the second radiator 233 can be arranged to overlap (i.e., 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 or completely overlap), or the first radiator 232 and the second radiator 233 can not overlap (i.e., 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 spaced apart or only overlap at the edges). This application does not impose any special limitations on this.

[0075] The first radiator 232 and the second radiator 233 constitute the radiating element of the antenna 70, which can be applied in the antenna 70. The antenna 70 may include multiple radiating elements, and the feed point 233a of the second radiator 233 of each of the multiple radiating elements is connected to the transmission line 73. Figure 4 (Not shown in the image) connected.

[0076] Please continue reading Figure 4 As shown, the battery cover assembly 23 may also 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 of the second radiator 233. Figure 4 (Not shown in the image) coupling. In this way, the grounding point 233b of the second radiator 233 is coupled to the grounding layer 238, meaning the radiating element composed of the second radiator 233 and the first radiator 232 is coupled to the grounding layer 238, ensuring the stability of the antenna signal transmitted on the radiating element. The grounding point 233b and the feed point 233a of the second radiator 233 can be spaced apart or coincident. This application does not impose any special limitations on this.

[0077] Furthermore, the grounding layer 238 can be disposed on the same layer as the second radiator 233, that is, the grounding layer 238 and the second radiator 233 are disposed together on the side of the dielectric layer 237 away from the battery cover body 231. In this way, it is convenient for the grounding layer 238 to be directly coupled to the grounding point 233b of the second radiator 233 without the need to make holes in the dielectric layer 237, which is more convenient for production and processing and helps to reduce production costs.

[0078] For example, Figure 4In this configuration, the first radiator 232 and the second radiator 233 are distributed along the Z-axis on both sides of the dielectric layer 237, while the ground layer 238 and the second radiator 233 are located on the same side of the dielectric layer 237. Furthermore, to minimize the area occupied by the radiating unit composed of the first radiator 232 and the second radiator 233 on the battery cover body 231, the projections of the first radiator 232 and the second radiator 233 on the first surface 231a completely overlap.

[0079] Furthermore, in Figure 4 In the indicated orientation, the conductive post 236 connects the right end of the first radiator 232 and the right end of the second radiator 233, meaning the cross-section of the radiating unit composed of the first radiator 232 and the second radiator 233 is U-shaped. The feed point 233a of the second radiator 233 is located at its left end. With this structure, the radiating unit composed of the first radiator 232 and the second radiator 233, as well as the conductive post 236, can be formed by bending a large radiator, which facilitates manufacturing and reduces production costs.

[0080] In the battery cover assembly 23 provided in this application, the radiating unit composed of the first radiator 232 and the second radiator 233 has a double-layer structure in the thickness direction (parallel to the Z-axis) of the battery cover body 231. This is equivalent to placing 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 placing the entire radiating unit on the inner surface of the battery cover (i.e. 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 ground 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.

[0081] For example, please see Figure 5 As shown, Figure 5 This is a partial cross-sectional view (parallel to the YZ plane) of another battery cover assembly 23 provided in an embodiment of this 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.

[0082] Specifically, in Figure 5 In the indicated orientation, the conductive post 236 is vertically positioned and connects the left end of the first radiator 232 and the right end of the second radiator 233. That is, the cross-section of the radiating unit composed of the first radiator 232 and the second radiator 233 is Z-shaped. The feed point 233a of the second radiator 233 is located at its left end.

[0083] Figure 5 The structure shown 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.

[0084] In some embodiments, both the first radiator 232 and the second radiator 233 may include a capacitor structure configured to radiate signals outward with the assistance of the floor 41 of the electronic device 01.

[0085] 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. This application does not impose any special limitations on this. For ease of understanding, the following description uses an interdigital capacitor as an example.

[0086] Please see Figure 6 and Figure 7 As shown, Figure 6 This is a three-dimensional structural diagram of the first radiator 232 and the second radiator 233 provided in the embodiments of this application. Figure 7 for Figure 6 A partial enlarged view at point A. Both the first radiator 232 and the second radiator 233 include a first comb-shaped electrode 234 and a second comb-shaped electrode 235 disposed opposite to each other.

[0087] The first comb-shaped electrode 234 includes a first busbar 2341 and a plurality of first electrode fingers 2342, which are spaced apart along the extension direction of the first busbar 2341. The second comb-shaped electrode 235 includes a second busbar 2351 and a plurality of second electrode fingers 2352, which are spaced apart along the extension direction of the second busbar 2351. The second electrode fingers 2352 and the first electrode fingers 2342 are spaced apart and alternately arranged. In this way, the inter-finger coupling of the first electrode fingers 2342 of the first comb-shaped electrode 234 and the second electrode fingers 2352 of the second comb-shaped electrode 235 generates a left-hand series capacitance effect.

[0088] Specifically, the first busbar 2341 extends along the Y-axis and has a first end and a second end distributed along the Y-axis. The second busbar 2351 extends along the Y-axis and also has a first end and a second end distributed along the Y-axis. The feed point 233a and ground point 233b of the second radiator 233 are located at the first end of its first busbar 2341. Furthermore, 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.

[0089] Furthermore, the first electrode finger 2342 of the first radiator 232 is opposite to the first electrode finger 2342 of the second radiator 233, and the second electrode finger 2352 of the first radiator 232 is opposite to the second electrode finger 2352 of the second radiator 233. The gap between the first electrode fingers 2342 and 2352 of the first radiator 232 is opposite to the gap between the first electrode fingers 2342 and 2352 of the second radiator 233. In this case, the radiation unit composed of the first radiator 232 and the second radiator 233 can be regarded as being formed by symmetrically bending a large interdigitated capacitor along a bending axis parallel to the X-axis, and the bent portion of the busbar on the large interdigitated capacitor can serve as the conductive post 236. This ensures that all the first electrode fingers 2342 and 2352 of the first radiator 232 and the second radiator 233 are excited, thus maximizing the equivalent capacitance of the radiation unit composed of the first radiator 232 and the second radiator 233.

[0090] In some embodiments, please continue to see Figure 6 As shown, the battery cover assembly 23 may also 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.

[0091] It is understood that the aforementioned inductor structure can be a single inductor (e.g., an inductor wire) or an equivalent inductance composed of multiple inductor elements; this application does not impose any special limitations on this. For example, Figure 6 The inductor structure is an inductor wire 239. One end of the inductor wire 239 is connected to the ground layer 238. The grounding point 233b of the second radiator 233 coincides with the feed point 233a. The other end of the inductor wire 239 is connected to the grounding point 233b of the second radiator 233.

[0092] In practical applications, the performance parameters of the radiating unit composed of the first radiator 232 and the second radiator 233 can be adjusted by changing parameters such as the thickness, dielectric constant, and loss tangent of the battery cover body 231 and the dielectric layer 237, as well as by changing the length of the first electrode finger 2342 and the second electrode finger 2352 and the length of the inductor wire 239.

[0093] Please continue reading Figure 6 As shown, and in combination Figure 8 As shown, Figure 8 for Figure 6 A schematic diagram of the cross-sectional dimensions of the battery cover assembly 23 (parallel to the YZ plane). The length of the first electrode finger 2342 along the X-axis ranges from 5mm to 10mm. For example, the length of the first electrode finger 2342 can be 5.0mm, 6.3mm, 7.2mm, 8.3mm, 9.0mm, 10.0mm, etc.

[0094] The length of the second electrode finger 2352 along the X-axis ranges from 5mm to 10mm. For example, the length of the second electrode finger 2352 can be 5.0mm, 6.3mm, 7.2mm, 8.3mm, 9.0mm, 10.0mm, etc.

[0095] The length of the inductor wire 239 along the Y-axis ranges from 2mm to 5mm. For example, the length of the inductor wire 239 can be 2.0mm, 2.8mm, 3.08mm, 3.8mm, 4.5mm, 5.0mm, etc.

[0096] The thickness D1 of the battery cover body 231 ranges from 0.3mm to 1mm. For example, D1 can be 0.30mm, 0.42mm, 0.50mm, 0.55mm, 0.70mm, 0.88mm, 1.0mm, etc.

[0097] 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 can be 5.0, 5.5, 6.2, 6.9, 7.0, 7.8, 8.0, etc.

[0098] 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.

[0099] The thickness D2 of the dielectric layer 237 ranges from 0.05mm to 0.5mm. For example, D2 can be 0.05mm, 0.08mm, 0.1mm, 0.25mm, 0.30mm, 0.38mm, 0.45mm, 0.50mm, etc.

[0100] The dielectric constant of dielectric layer 237 ranges from 1 to 5. For example, the dielectric constant of dielectric layer 237 can be 1.0, 1.50, 2.20, 2.55, 2.98, 3.60, 4.20, 4.85, 5.0, etc.

[0101] The loss tangent of dielectric layer 237 ranges from 0.01 to 0.2. For example, the loss tangent of 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.

[0102] The distance H between the second radiator 233 and the floor 41 ranges from 0.1mm to 0.5mm. For example, H can be 0.1mm, 0.15mm, 0.20mm, 0.35mm, 0.5mm, etc.

[0103] For example, Figure 6 and Figure 8 In the circuit, the first electrode finger 2342 has a length of 7.2 mm along the X-axis, the second electrode finger 2352 has a length of 7.2 mm along the X-axis, and the inductor wire 239 has a length of 3.08 mm along the Y-axis. The battery cover body 231 is made of glass, with a thickness D1 of 0.55 mm, a dielectric constant of 7, and a loss tangent of 0.01. The dielectric layer 237 has a thickness D2 of 0.1 mm, a dielectric constant of 2.98, and a loss tangent of 0.0765. The distance H between the second radiator 233 and the ground 41 is 0.2 mm.

[0104] Based on this, Figure 6 The battery cover assembly 23 in this application is a design structure provided in the embodiment of the present application. A single-layer interdigitated capacitor (i.e., the aforementioned radiating element 72) is disposed on the side of the dielectric layer 237 away from the battery cover body 231 as a control structure (this schematic diagram is omitted. In the control structure, except that the capacitor structure is a single-layer interdigitated capacitor, the other parameters are consistent with the design structure). The two are analyzed and compared.

[0105] Please see Figure 9 , Figure 10 , Figure 11 and Figure 12 As shown, Figure 9 This is a schematic diagram of the cross-sectional electric field vector within the battery cover body 231 of the comparison structure (parallel to the YZ plane). Figure 10 The above is a simulation diagram of the electric field inside the battery cover body 231 in the comparison structure. Figure 11 A schematic diagram of the cross-sectional electric field vector of the design structure provided in the embodiments of this application (parallel to the YZ plane). Figure 12A simulation diagram of the electric field distribution of the design structure provided in the embodiments of this application. Figure 9 and Figure 11 The straight and curved arrows indicate the direction of the electric field. Figure 10 and Figure 12 In the diagram, the darker the gray area, the higher the electric field strength.

[0106] 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 disposed on the side of the dielectric layer 237 away from the battery cover body 231, the area with a strong electric field intensity within the dielectric layer 237 is large and continuous. However, when the double-layer interdigital capacitor structure composed of the first radiator 232 and the second radiator 233 is disposed on both sides of the dielectric layer 237, the area with a strong electric field intensity within the dielectric layer 237 is small and discontinuous, and the electric field intensity in the part of the battery cover body 231 opposite to the first radiator 232 is significantly stronger.

[0107] In other words, the electrode interdigital coupling of the radiating unit (double-layer interdigitated capacitor structure) composed of the first radiator 232 and the second radiator 233 provided in this application is strong, which can change the electric field distribution in the dielectric layer 237 and the battery cover body 231, so that a part of the radiated 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.

[0108] Please see Figure 13 As shown, Figure 13 This diagram illustrates the S11 curves of the control structure and the design structure provided in the embodiments of this application. The horizontal axis represents frequency, and the vertical axis represents the S-parameters. The solid line represents the S11 curve of the design structure, and the dashed line represents the S11 curve of the control structure.

[0109] from Figure 13 In this design, the frequency band between the two lowest points of the S11 curve of the structure can be selected as its operating frequency band. Within this frequency band, the return loss of antenna 70 is minimized. That is, the operating frequency band of the first radiator 232 and the second radiator 233 in the design structure is 3.3GHz to 3.6GHz. Moreover, the operating frequency band of antenna 70 in the design structure shows good consistency with the fast wave region of the array elements, and is in a left-handed and right-handed balance state.

[0110] Please see Figure 14 As shown, Figure 14This diagram illustrates the radiation efficiency simulation of the control structure and the design structure provided in the embodiments of this 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.

[0111] from Figure 14 As can be seen from the data, the radiation efficiency of the design structure provided in this application embodiment is significantly higher than that of the control structure at all frequency points within its operating frequency band (3.3GHz to 3.6GHz).

[0112] Please see Figure 15 and Figure 16 As shown, Figure 15 The diagram shows a simulation of metal loss for the control structure and the design structure provided in the embodiments of this application. The horizontal axis represents frequency, and the vertical axis represents the percentage of metal loss. Solid lines represent the metal loss of the design structure, and dashed lines represent the metal loss of the control structure. Figure 16 This diagram illustrates the dielectric loss simulation of the design structure provided in the comparative structure and the embodiments of this application. The horizontal axis represents frequency, and the vertical axis represents the percentage of dielectric loss. The solid line represents the dielectric loss curve of the design structure, and the dashed line represents the dielectric loss curve of the comparative structure.

[0113] pass Figure 15 and Figure 16 and combined Figure 12 Simulation results show that the double-layer interdigitated capacitor structure of the first radiator 232 and the second radiator 233 can guide some energy into the battery cover body 231 with a smaller loss tangent, achieving a significant reduction in dielectric loss. Specifically, the dielectric loss of the designed structure is significantly lower than that of the control structure at all frequency points within its operating frequency band (3.3GHz to 3.6GHz), approximately only 0.5 times that of the control structure. The metal loss of the designed structure only shows a significant increase at a few frequency points, but the total metal loss is still reduced. During the structural design process, such as... Figure 6 As shown in the structural parameters, after the first radiator 232 and the second radiator 233 form a double-layer interdigitated capacitor structure, the series capacitance effect in the equivalent circuit remains unchanged, while 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. This is manifested as an increase in the length of the inductor line 239, which makes... Figure 15 The analysis of the reasons for the increased metal loss in the designed structure is reasonable.

[0114] Since the battery cover body 231 is made of metal, it may provide electromagnetic shielding to the first radiator 232 and the second radiator 233, thereby adversely affecting the transmission and reception of antenna signals. For the above reasons, please refer to... Figure 17 As shown, Figure 17A partial structural cross-sectional schematic diagram (parallel to the YZ plane) of another battery cover assembly 23 provided in the embodiments of this application.

[0115] A radiation window 2310 is provided on the battery cover body 231. The radiation window 2310 penetrates the battery cover body 231 along the thickness direction (parallel to the Z-axis) and faces the radiation unit composed of the first radiator 232 and the second radiator 233.

[0116] 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, it is possible to avoid the battery cover body 231 forming electromagnetic shielding for the first radiator 232 and the second radiator 233, thus ensuring that the first radiator 232 and the second radiator 233 can normally transmit and receive antenna signals.

[0117] It is understood that the projections of the first radiator 232 and the second radiator 233 onto the first surface 231a of the battery cover body 231 can be partially or completely located within the radiation window 2310, and this application does not impose any special limitations on this. Furthermore, when the projections of the first radiator 232 and the second radiator 233 onto 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.

[0118] Further, please see Figure 18 As shown, Figure 18 This is a partial cross-sectional view (parallel to the YZ plane) of another battery cover assembly 23 provided in this application embodiment. The battery cover assembly 23 may also include a sealing member 24, which fills the radiation window 2310 and is an insulator.

[0119] The sealing element 24 can block the radiation window 2310, which not only prevents foreign objects (such as moisture, grease, dust, etc.) from entering the electronic device 01 through the radiation window 2310, but also makes the shape of the battery cover body 231 smoother and more aesthetically pleasing by filling the radiation window 2310 with the sealing element 24. In addition, since the sealing element 24 is an insulator, it will not provide electromagnetic shielding for the first radiator 232 and the second radiator 233.

[0120] For example, the sealing element 24 can be made of rubber, silicone, plastic, etc., so that it can be directly filled into the radiation window 2310 by injection molding.

[0121] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0122] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery cover assembly, characterized in that, include: A battery cover, comprising a battery cover body and a decorative film layer, wherein the battery cover body is made of transparent non-metallic material, the decorative film layer is provided with a specific pattern, and the battery cover body has a first surface and a second surface disposed opposite to each other. A radiation unit, comprising a first radiator and a second radiator, wherein the second radiator is provided with a feed point and is used to couple a signal to the first radiator; The first radiator, the second radiator, and the decorative film layer are disposed on the same side of the battery cover body. The first radiator is embedded in the decorative film layer and is attached to a first region of the first surface, located between the first region and the decorative film layer. The decorative film layer is attached to and covers other regions of the first surface except for the first region. The decorative film layer includes a first portion opposite to the first region and a second portion opposite to the other regions. The sum of the thicknesses of the first radiator and the first portion is equal to the thickness of the second portion. The second radiator is disposed on the side of the decorative film layer away from the battery cover body, and the distance between the second radiator and the first surface is equal to the thickness of the second portion. The projection of the first radiator onto the first surface overlaps at least partially with the projection of the second radiator onto the first surface. Alternatively, the projection of the first radiator on the first surface does not overlap with the projection of the second radiator on the first surface. The battery cover assembly further includes a conductive post. The decorative film layer has a through hole, and the conductive post passes through the through hole. One end of the conductive post is coupled to the first radiator, and the other end of the conductive post is coupled to the second radiator.

2. The battery cover assembly according to claim 1, characterized in that, Both the first radiator and the second radiator include a capacitor structure configured to radiate signals outward with the assistance of the floor of the electronic device.

3. The battery cover assembly according to claim 2, 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, the plurality of first electrode fingers being 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, the plurality of second electrode fingers being arranged at intervals along the extension direction of the second bus bar, the second electrode fingers and the first electrode fingers being arranged at intervals and alternately.

4. The battery cover assembly according to any one of claims 1 to 3, characterized in that, The battery cover assembly further includes a grounding layer disposed on the battery cover body, and the grounding layer is coupled to the grounding point of the second radiator.

5. The battery cover assembly according to claim 4, characterized in that, The grounding layer is disposed in the same layer as the second radiator.

6. The battery cover assembly according to claim 4, characterized in that, The battery cover assembly also includes an inductor structure, through which the grounding point of the second radiator is coupled to the grounding layer.

7. The battery cover assembly according to claim 6, characterized in that, The inductor structure includes an inductor wire, one end of which is coupled to the ground layer, and the other end of which is coupled to the grounding point of the second radiator.

8. The battery cover assembly according to any one of claims 1 to 3, characterized in that, The battery cover body is an insulator.

9. The battery cover assembly according to any one of claims 1 to 3, characterized in that, The first radiator and the second radiator operate in the frequency band of 3.3 GHz to 3.6 GHz.

10. An electronic device, characterized in that, include: The middle frame encloses an accommodating space; A motherboard, wherein the motherboard is disposed within the accommodating space, and a floor is provided on the motherboard; The battery cover assembly according to any one of claims 1 to 9, 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 emitting signals.

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