Terminal antenna and electronic device

Abstract

The application relates to the technical field of terminal antennas, and discloses a terminal antenna and an electronic device. The electronic device comprises a wireless charging coil and an antenna radiator located on one side of the wireless charging coil, the antenna radiator is provided with a slot, the slot extends from the middle of the antenna radiator to the edge of the antenna radiator, and the part of the antenna radiator disconnected by the slot is provided with a capacitor. The part of the antenna radiator disconnected by the slot is connected in series through the capacitor, the capacitor has the effect of passing high frequency and resisting low frequency, when the wireless charging coil works, the capacitor is equivalent to a disconnection, the formation of eddy current can be inhibited due to the existence of the slot on the antenna radiator, when the antenna radiator works, the capacitor is equivalent to a short circuit, and the performance of the antenna radiator is not affected. In this way, the coexistence problem of the antenna radiator and the wireless charging coil can be effectively solved, the wireless charging efficiency is improved, the eddy current heat is reduced, the charging power is improved, and the charging time is shortened.

Description

Technical Field

[0001] This application relates to the field of terminal antenna technology, and in particular to a terminal antenna and electronic device. Background Technology

[0002] Antennas installed in electronic devices can be called terminal antennas. As electronic devices become increasingly complex with more and more functional modules and more limited space, conflicts between different modules are becoming more frequent. For example, the interaction between a wireless charging module and an antenna radiator is very significant.

[0003] In some electronic devices, the coil of the wireless charging module overlaps with the antenna radiator, causing eddy currents (induced currents flowing along a closed loop within the antenna radiator) to form on the antenna radiator during wireless charging. These eddy currents not only reduce the charging efficiency of wireless charging but also generate additional heat, causing the temperature of the electronic device to rise and affecting the performance of both the wireless charging module and the antenna. Summary of the Invention

[0004] To address the aforementioned technical problems, embodiments of this application provide a terminal antenna and an electronic device.

[0005] In a first aspect, embodiments of this application provide an electronic device, including: a wireless charging coil; an antenna radiator located on one side of the wireless charging coil, the antenna radiator being located within the magnetic field generated when the wireless charging coil is energized, and the antenna radiator having a slot extending from the middle of the antenna radiator to its edge, one side of the slot along its width direction being a first end of the antenna radiator, and the other side of the slot along its width direction being a second end of the antenna radiator; and at least one capacitor connected in series between the first end and the second end.

[0006] The electronic device of this application embodiment blocks the formation of eddy currents by forming slots in the antenna radiator. Furthermore, capacitors connect the slotted portions of the antenna radiator in series. Utilizing the capacitor's effect of passing high frequencies and blocking low frequencies, the capacitor acts as an open circuit when the wireless charging coil is operating. The slots in the antenna radiator suppress eddy current formation, while the capacitor acts as a short circuit, ensuring the antenna radiator's performance remains unaffected. This effectively solves the problem of coexistence between the antenna radiator and the wireless charging coil, improving wireless charging efficiency, reducing eddy current heat generation, increasing charging power, and shortening charging time.

[0007] In some possible implementations, the wireless charging coil has a first operating frequency, and the antenna radiator has a second operating frequency, wherein the first operating frequency is lower than the second operating frequency.

[0008] In some possible implementations, the second operating frequency is more than 6 times that of the first operating frequency.

[0009] In some possible implementations, the first operating frequency ranges from 100kHz to 20MHz, and the second operating frequency ranges from 600MHz to 6GHz.

[0010] It is understandable that the electrical connection between the capacitor and the antenna radiator can vary depending on the shape of the antenna radiator.

[0011] In some possible implementations, the antenna radiator is formed in the first circuit board, and the capacitor is soldered to the first circuit board.

[0012] In this way, the antenna radiator and capacitor are integrated on the same circuit board, which helps to improve space utilization and reduce the size of electronic devices. Furthermore, the capacitor parameters can be flexibly adjusted according to specific needs to optimize charging performance and antenna performance.

[0013] In some possible implementations, the antenna radiator is a metal plate, the capacitor is integrated into a second circuit board, the first electrode of the capacitor is electrically connected to the first terminal through the second circuit board, and the second electrode of the capacitor is electrically connected to the second terminal through the second circuit board.

[0014] It is understandable that the capacitor is electrically connected to the antenna radiator through the second circuit board, which can provide a reliable mechanical connection, reduce the risk of connection failure, and the parameters of the capacitor on the second circuit board can be flexibly adjusted according to specific needs to optimize charging performance and antenna performance.

[0015] In some possible implementations, the second circuit board includes a first welding end and a second welding end, the first electrode of the capacitor is electrically connected to the first welding end, and the second electrode of the capacitor is electrically connected to the second welding end; and the second circuit board is welded to the first end through the first welding end and to the second end through the second welding end.

[0016] In some possible implementations, the second circuit board includes a first metal spring group and a second metal spring group. The first electrode of the capacitor is electrically connected to the metal spring in the first metal spring group, and the second electrode of the capacitor is electrically connected to the metal spring in the second metal spring group. Furthermore, the second circuit board is electrically connected to the first terminal through the first metal spring group and to the second terminal through the second metal spring group.

[0017] It is understandable that using metal springs to achieve electrical connection between capacitors and antenna radiators can provide stable electrical connections, mechanical buffering, absorption of vibration and shock, and adaptation to miniaturized devices, thus contributing to the compactness of electronic devices.

[0018] In some possible implementations, the axis of the wireless charging coil intersects the plane of the antenna radiator.

[0019] In some possible implementations, the axis of the wireless charging coil is perpendicular to the plane of the antenna radiator, and the antenna radiator and the wireless charging coil are spaced apart along a first direction parallel to the axis. Alternatively, the antenna radiator has a protrusion that protrudes toward the wireless charging coil, and the wireless charging coil is arranged around the protrusion.

[0020] In some possible implementations, the electronic device also includes: a ground plane; and a feeding element located between the ground plane and the antenna radiator for feeding the antenna radiator.

[0021] In some possible implementations, at least one capacitor includes multiple capacitors arranged sequentially along the extension direction of the slot.

[0022] In some possible implementations, the antenna radiator is a polygonal or circular plate.

[0023] In some possible implementations, the slot in the plane of the antenna radiator can be elongated, triangular, circular, elliptical, or irregular in shape.

[0024] Secondly, embodiments of this application provide a terminal antenna, including: an antenna radiator having a slot extending from the middle of the antenna radiator to its edge, one side of the slot along its width direction being a first end of the antenna radiator, and the other side of the slot along its width direction being a second end of the antenna radiator; and at least one capacitor connected in series between the first end and the second end.

[0025] In some possible implementations, the antenna radiator is formed in the first circuit board, and the capacitor is soldered to the first circuit board.

[0026] In some possible implementations, the antenna radiator is a metal plate, the capacitor is integrated into a second circuit board, the first electrode of the capacitor is electrically connected to the first terminal through the second circuit board, and the second electrode of the capacitor is electrically connected to the second terminal through the second circuit board.

[0027] In some possible implementations, the second circuit board includes a first welding end and a second welding end, the first electrode of the capacitor is electrically connected to the first welding end, and the second electrode of the capacitor is electrically connected to the second welding end; and the second circuit board is welded to the first end through the first welding end and to the second end through the second welding end.

[0028] In some possible implementations, the second circuit board includes a first metal spring group and a second metal spring group. The first electrode of the capacitor is electrically connected to the metal spring in the first metal spring group, and the second electrode of the capacitor is electrically connected to the metal spring in the second metal spring group. Furthermore, the second circuit board is electrically connected to the first terminal through the first metal spring group and to the second terminal through the second metal spring group.

[0029] In some possible implementations, the antenna radiator is a polygonal or circular plate.

[0030] In some possible implementations, the slot in the plane of the antenna radiator can be elongated, triangular, circular, elliptical, or irregular in shape.

[0031] The technical effects of the second aspect mentioned above can be referred to the technical effects of the first aspect, and will not be repeated here. Attached Figure Description

[0032] Figure 1A According to some embodiments of this application, a front view of a wearable device 100 is shown;

[0033] Figure 1B According to some embodiments of this application, a side view of a wearable device 100 is shown;

[0034] Figure 1C According to some embodiments of this application, a schematic diagram of a split-type wearable device 100 is shown;

[0035] Figure 1D According to some embodiments of this application, a front view of a motherboard 120 is shown;

[0036] Figure 1E According to some embodiments of this application, a front view of a sensor 140 is shown;

[0037] Figure 1F According to some embodiments of this application, a front view of a metal body 130 is shown;

[0038] Figure 2 According to some embodiments of this application, a simplified structural schematic diagram of an antenna 160 is shown;

[0039] Figure 3A A perspective view of a first antenna radiator 161 is shown according to some embodiments of this application;

[0040] Figure 3B According to some embodiments of this application, a front view of a first antenna radiator 161 is shown;

[0041] Figure 3C According to some embodiments of this application, a perspective view of a second type of antenna radiator 161 is shown;

[0042] Figure 3D According to some embodiments of this application, a front view of a second type of antenna radiator 161 is shown;

[0043] Figure 4According to some embodiments of this application, a schematic diagram of eddy currents forming on an antenna radiator 161 is shown;

[0044] Figure 5 According to some embodiments of this application, a schematic diagram of the principle of vortex formation is shown;

[0045] Figure 6A According to some embodiments of this application, a schematic diagram of a third type of antenna radiator 161 is shown;

[0046] Figure 6B A schematic diagram of a third type of antenna radiator 161 is shown according to some embodiments of this application. Figure 2 ;

[0047] Figure 7A According to some embodiments of this application, a schematic diagram of a fourth type of antenna radiator 161 is shown;

[0048] Figure 7B A schematic diagram of a fifth antenna radiator 161 is shown according to some embodiments of this application. Figure 2 ;

[0049] Figure 8A A schematic diagram of a slot 161A is shown according to some embodiments of this application;

[0050] Figure 8B According to some embodiments of this application, a schematic diagram of another slot 161A is shown;

[0051] Figure 8C According to some embodiments of this application, a schematic diagram of yet another slot 161A is shown. Detailed Implementation

[0052] The illustrative embodiments of this application include, but are not limited to, a terminal antenna and an electronic device.

[0053] It should be noted that the electronic devices in this application's embodiments include, but are not limited to, mobile stations (MS) and mobile terminals (MT). For example, electronic devices can be mobile phones, smart TVs, wearable devices, tablets, desktop computers, laptops, virtual reality (VR) devices, augmented reality (AR) devices, terminals in industrial control, self-driving, remote medical surgery, smart grids, transportation safety, smart cities, smart homes, and so on. This application's embodiments do not limit the specific form of the electronic device; the following example uses a wearable device as an example.

[0054] Figures 1A to 1C A schematic diagram of the structure of a wearable device 100 is shown. Figures 1A to 1C The wearable device 100 of the illustrated embodiment is described using a watch as an example. Figure 1A This is a front view of the wearable device 100. Figure 1B This is a side view of wearable device 100. Figure 1C This is a schematic diagram of the wearable device 100 in its various parts.

[0055] like Figures 1A to 1C As shown, the wearable device 100 includes a watch body 200 and a watch strap 300. The watch body 200 and the watch strap 300 can be fixedly connected or detachably connected. The watch body 200 can be circular, rectangular, or other shapes. The watch body 200 may include a housing 210 and a display screen 220.

[0056] For example, the housing 210 may include a front housing 2101, a middle frame 2102, and a rear housing 2103. The front housing 2101 may be arranged in a ring around the display screen 220, and the front housing 2101 at least partially covers the light-emitting surface of the display screen 220. One end of the middle frame 2102 is connected to the front housing 2101, and the other end of the middle frame 2101 is connected to the rear housing 2103. Along the thickness direction of the watch body 200 (the Z direction shown in the figures of this application), the rear housing 2103 is disposed opposite to the display screen 220. When the wearable device 100 is worn, the outer surface of the rear housing 2103 may contact the user's wrist. The front housing 2101, middle frame 2102, and rear housing 2103 may be separate structural components or an integrated structure.

[0057] The housing 210 and the display screen 220 enclose a receiving space. The receiving space can be used to accommodate various functional modules and electronic components of the wearable device 100, including but not limited to: processor, wireless charging module, battery, speaker, motor, sensor, etc.

[0058] For example, such as Figure 1C As shown, the accommodating space sequentially houses a metal body 110, a motherboard 120, a metal body 130, a sensor 140, and a wireless charging coil 150 for the wireless charging module along the Z direction. The motherboard 120 integrates at least a processor (not shown), a battery 121, a speaker 122, and a motor 123.

[0059] The metal body 110 / 130 is an important component in the wearable device 100. Depending on the surrounding electronic components, it can play a role such as physical protection, electromagnetic compatibility, heat dissipation, or other functional roles. For example, the metal body 110 can be located near the front shell 2101 within the accommodating space. The metal body 110 is located between the display screen 220 and the motherboard 120. Therefore, the metal body 110 can be used to electrically connect the display screen 220 and the motherboard 120, so that the processor on the motherboard 120 can process the relevant display signals of the display screen 220.

[0060] For example, Figures 1D to 1F The front views of the motherboard 120, sensor 140, and metal body 130 are shown respectively.

[0061] Reference Figure 1D As shown, the speaker 122 and motor 123 can be positioned on either side of the battery 121. The battery 121 powers the various functional modules and electronic components in the wearable device 100. The speaker 122 enables audio functions, such as music playback. The motor 123 generates vibration feedback. The motor 123 can be used for incoming call vibration alerts or for touch vibration feedback. For example, touch operations applied to different applications (such as taking photos, playing audio, etc.) can correspond to different vibration feedback effects. Touch operations applied to different areas of the display screen 220 can also correspond to different vibration feedback effects from the motor 123. Different application scenarios (such as time reminders, receiving messages, alarm clocks, games, etc.) can also correspond to different vibration feedback effects. The touch vibration feedback effect can also be customized.

[0062] Reference Figure 1E and combined Figure 1CThe sensor 140 can be positioned within the accommodating space near the rear housing 2103. The sensor 140 can provide various intelligent services such as health monitoring, environmental perception, and user interaction, including but not limited to pressure sensors, heart rate sensors, electrocardiogram sensors, proximity sensors, humidity sensors, temperature sensors, touch sensors, and ambient light sensors.

[0063] Reference Figure 1F As shown, a metal body 130 can be disposed within the accommodating space near the rear shell 2103. The function of the metal body 130 is as described above and will not be repeated here.

[0064] Continue reading Figure 1C The wireless charging coil 150 is disposed within the accommodating space near the rear housing 2103. The wireless charging coil 150 receives wireless charging input, can charge the battery 121, and can also power the wearable device 100. In some embodiments, the axis of the wireless charging coil 150 is parallel to the Z-direction.

[0065] It is understood that the wearable device 100 also includes an antenna, which includes an antenna radiator and a ground plane. The antenna radiator is used to receive and transmit electromagnetic waves and is typically made of a conductive material, such as a metal plate. The ground plane refers to at least a portion of any grounding layer, ground plane, or grounding metal layer, etc., within the wearable device 100, or at least a portion of any combination of any of the aforementioned grounding layers, ground planes, or grounding components, etc. The ground plane can be used for grounding electronic devices within the wearable device 100.

[0066] Figure 2 A simplified structural diagram of the antenna 160 in some embodiments is shown. It is understood that the shape and structure of the antenna 160 are not fixed, depending on the actual internal space of the wearable device 100 and the design of each structural component.

[0067] like Figure 2 As shown, the antenna 160 includes an antenna radiator 161 and a ground plane 162. The antenna radiator 161 can be a circular, rectangular or other polygonal plate, and the material of the antenna radiator 161 can be a metallic material. Figure 2 In the example, the antenna radiator 161 is a rectangular metal plate. The shape of the floor 162 is similar to that of the antenna radiator 161.

[0068] Both the antenna radiator 161 and the ground plane 162 are metallic conductors, spaced apart and separated by a slot z1. The antenna radiator 161 can be a planar antenna. The antenna radiator 161 and the ground plane 162 constitute a planar slotted antenna, radiating electromagnetic waves using the slot z1. When the antenna 160 is operating, it forms a unique electromagnetic field mode between the antenna radiator 161 and the ground plane 162, typically a TE (transverse electromagnetic wave) mode or a TM (transverse magnetic wave) mode. By precisely designing the dimensions of the slot z1, the antenna's operating mode can be controlled, thereby optimizing the antenna's radiation characteristics.

[0069] In some embodiments, the antenna 160 further includes a feeding element (not shown), located between the antenna radiator 161 and the ground plane 162. One end of the feeding element can be electrically connected to the antenna radiator 161, and the other end can be electrically connected to the ground plane 162. The feeding element is used to feed power to the antenna radiator 161. Exemplarily, the feeding element can be a conductor with good conductivity, such as a copper pillar, and is not specifically limited herein. In some embodiments, one end of the feeding element includes a signal source, and the other end excites the antenna radiator 161. The signal source and the antenna radiator 161 share a common ground. The signal source emits a radio frequency signal of corresponding power, which is then excited onto the antenna radiator 161 and radiated outwards through the feeding element.

[0070] Currently, due to the limited layout space of the wearable device 100, the position of the antenna radiator 161 in the wearable device 100 overlaps with the position of the wireless charging coil 150. For example, in some embodiments, referring to... Figure 3A and Figure 3B As shown, the rear shell 2103 is made of metal, and the antenna radiator 161 is directly formed on the rear shell 2103. That is, the rear shell 2103 can serve as the antenna radiator 161. This reuses existing structural components of the wearable device 100, saving layout space. Figure 3A and Figure 3B As can be seen, the wireless charging coil 150 is located inside the back cover 2103, and the position of the wireless charging coil 150 is very close to the back cover 2103. The axis L of the wireless charging coil 150 can be perpendicular to the plane where the back cover 2103 is located.

[0071] Alternatively, in some embodiments, the rear shell 2103 is made of a non-metallic material, such as plastic or glass. In this case, the antenna radiator 161 is generally disposed on the inner side of the rear shell 2103 (facing the accommodating space), and the shape of the antenna radiator 161 can be similar to the shape of the rear shell 2103. For example, Figure 3C and Figure 3D As shown, the wireless charging coil 150, the antenna radiator 161, and the ground 162 are arranged sequentially at intervals along the Z direction, and the wireless charging coil 150 is positioned very close to the antenna radiator 161. The axis L of the wireless charging coil 150 is perpendicular to the plane where the antenna radiator 161 is located.

[0072] It's understandable, combined Figure 1C Regardless of whether the antenna radiator 161 is formed directly from the rear housing 2103 or disposed inside the rear housing 2103, the distance between the wireless charging coil 150 and the antenna radiator 161 in the Z direction will be small, meaning that the positions of the wireless charging coil 150 and the antenna radiator 161 will overlap. Therefore, if Figure 4 As shown, when the wireless charging coil 150 is energized, the antenna radiator 161 will be in the magnetic field generated by the wireless charging coil 150, causing eddy currents to be generated on the antenna radiator 161.

[0073] Figure 5 A schematic diagram illustrating the principle of eddy currents generated by the wireless charging coil 150 on the antenna radiator 161 is shown. Figure 5 As shown, eddy currents are a type of electromagnetic induction phenomenon. When the wireless charging coil 150 is energized, for example, when a current I enters the wireless charging coil 150 in the direction shown by the arrow, it will cause the wireless charging coil to generate a magnetic field B. It can be understood that a change in the current I will cause a change in the magnetic field B. Since the antenna radiator 161 is a conductor, and the wireless charging coil 150 typically varies in frequency by several hundred kilohertz (kHz), the antenna radiator 161 is in a changing magnetic field, which will induce an electromotive force inside the antenna radiator 161, thereby generating an induced current i. This induced current i forms a closed loop within the antenna radiator 161, and its flow direction is similar to a whirlpool in water; therefore, it is called an eddy current.

[0074] Understandably, eddy currents not only reduce the charging efficiency of wireless charging but also generate additional heat, causing the temperature of the wearable device 100 to rise. This affects the performance of the wireless charging module and antenna within the wearable device 100. For example, when the temperature rises to its maximum, the charging power of the wearable device 100 will decrease, resulting in a longer actual charging time and impacting the user's charging experience.

[0075] Based on this, embodiments of this application provide a terminal antenna, which forms a slot in the antenna radiator, for example... Figure 6A As shown, the antenna radiator 161 has a slot 161A, which can block the formation of eddy currents; and, as Figure 6BAs shown, the portion of the antenna radiator 161 that is disconnected by the slot 161A is connected in series via capacitor 1611. Utilizing the effect of capacitor 1611 passing high frequencies and blocking low frequencies, when the wireless charging coil 150 is operating, capacitor 1611 is essentially an open circuit. The slot 161A on the antenna radiator 161 suppresses the formation of eddy currents, while capacitor 1611 is essentially a short circuit, ensuring that the performance of the antenna radiator 161 remains unaffected. This effectively solves the problem of coexistence between the antenna radiator 161 and the wireless charging coil 150, improving wireless charging efficiency, reducing eddy current heat generation, increasing charging power, and shortening charging time.

[0076] The terminal antenna of the present application embodiment will be further described below with reference to the accompanying drawings.

[0077] In some embodiments, such as Figure 6B As shown, the terminal antenna includes an antenna radiator 161 with a slot 161A extending from the center of the antenna radiator 161 towards its edge. It can be understood that most eddy currents form closed loops around the center of the antenna radiator 161; therefore, the slot 161A, extending from the center of the antenna radiator 161 towards its edge, can block the formation of eddy currents.

[0078] Continue reading Figure 6B The terminal antenna includes at least one capacitor 1611. It should be noted that this application does not limit the number of capacitors 1611. Figure 6B The example uses four capacitors 1611. When the terminal antenna includes multiple capacitors 1611, the multiple capacitors 1611 (e.g.) Figure 6B The four capacitors (1611) can be arranged sequentially at intervals along the extension direction of the slot (161A).

[0079] One side of the slot 161A along its width direction is the first end 161a of the antenna radiator 161, and the other side of the slot 161A along its width direction is the second end 161b of the antenna radiator 161. A capacitor 1611 is connected in series between the first end 161a and the second end 161b. That is, the capacitor 1611 electrically connects the first end 161a and the second end 161b.

[0080] In some embodiments, the wireless charging coil 150 has a first operating frequency at which the capacitor 1611 presents a first impedance. The antenna radiator 161 has a second operating frequency at which the capacitor 1611 presents a second impedance.

[0081] The impedance formula for capacitor 1611 can be understood as: Z = 1 / jwC, where Z is the impedance of capacitor 1611; w = 2πf, f is the frequency; j is the imaginary unit; and C is the capacitance of capacitor 1611. That is, the lower the frequency, the higher the impedance of capacitor 1611; and the higher the frequency, the lower the impedance of capacitor 1611.

[0082] Generally, the first operating frequency is lower than the second operating frequency. For example, the frequency of the wireless charging coil 150 when energized can be several hundred kHz, while the antenna operating frequency can be several hundred megahertz (MHz). Therefore, when the wireless charging coil 150 is working, the capacitor 1611 presents a relatively large first impedance, and the first end 161a and the second end 161b of the antenna radiator 161 are essentially open-circuited. In this way, the slot 161A cuts off the trajectory formed by eddy currents, suppressing the formation of eddy currents. When the antenna radiator 161 is working, the capacitor 1611 presents a relatively small second impedance. Therefore, the first end 161a and the second end 161b of the antenna radiator 161 are essentially short-circuited, so that the performance of the antenna radiator 161 is not affected, allowing the electromagnetic radiation mode of the terminal antenna to resonate completely. That is, the terminal antenna reaches its optimal operating state at its operating frequency, achieving maximum radiation efficiency and optimal electrical performance.

[0083] In this way, the coexistence problem of antenna radiator 161 and wireless charging coil 150 can be effectively solved, the charging efficiency during wireless charging can be improved, and the heat generated by eddy currents can be reduced, thereby increasing the charging power, shortening the charging time, and keeping the radiation performance of the antenna unaffected.

[0084] In some embodiments, the second operating frequency can be more than six times the first operating frequency. For example, the range of the first operating frequency includes 100 kHz to 20 MHz, and the range of the second operating frequency includes 600 MHz to 6 GHz.

[0085] It should be noted that the capacitance value of capacitor 1611 is not limited in this application embodiment, and is selected according to the first operating frequency and the second operating frequency. For example, in some embodiments, the capacitance value of capacitor 1611 may be 30 (picofarad) pF or 100 pF, etc.

[0086] In this embodiment of the application, depending on the different shapes of the antenna radiator 161, the electrical connection method between the capacitor 1611 and the antenna radiator 161 can be different.

[0087] In some embodiments, the antenna radiator 161 is formed in a first circuit board, which may be a flexible printed circuit (FPC) or a rigid printed circuit board (PCB). That is, the antenna radiator 161 is formed by fabricating an FPC or a PCB.

[0088] Accordingly, capacitor 1611 can be directly soldered to the first circuit board. For example, the first electrode of capacitor 1611 is soldered to a first terminal 161a on the first circuit board, and the second electrode of capacitor 1611 is soldered to a second terminal 161b on the first circuit board. One of the first and second electrodes can be a positive electrode, and the other can be a negative electrode.

[0089] It is understandable that integrating the antenna radiator 161 and capacitor 1611 onto the same circuit board helps improve space utilization and reduce the size of the wearable device 100. Furthermore, the parameters of capacitor 1611 can be flexibly adjusted according to specific needs to optimize charging performance and antenna performance.

[0090] In other embodiments, the antenna radiator 161 is a metal plate, such as a metal plate based on laser direct structuring (LDS) or print direct structuring (PDS), or a metal steel sheet, etc.

[0091] Accordingly, in some embodiments, such as Figure 7A As shown, capacitor 1611 is integrated into a second circuit board 163, which can be an FPC or a PCB. Capacitor 1611 is electrically connected to a first terminal 161a and a second terminal 161b via the second circuit board 163. That is, the first electrode of capacitor 1611 is electrically connected to the first terminal 161a via the second circuit board 163, and the second electrode of capacitor 1611 is electrically connected to the second terminal 161b via the second circuit board 163.

[0092] It should be noted that the capacitor 1611 is integrated into the second circuit board 163. This can mean that the capacitor 1611 is directly mounted on the surface of the second circuit board 163; or it can mean that the capacitor 1611 is a built-in device of the second circuit board 163, that is, the capacitor 1611 is embedded inside the second circuit board 163 during the manufacturing process of the second circuit board 163, and the first electrode and the second electrode of the capacitor 1611 can be exposed on the surface of the second circuit board 163.

[0093] In a specific configuration where capacitor 1611 is electrically connected to first terminal 161a and second terminal 161b via second circuit board 163, such as Figure 7AAs shown, the second circuit board 163 includes a first soldering terminal 163a and a second soldering terminal 163b. The first soldering terminal 163a is soldered to the first terminal 161a, and the second soldering terminal 163b is soldered to the second terminal 161b. Furthermore, the first electrode of the capacitor 1611 is electrically connected to the first soldering terminal 163a, and the second electrode of the capacitor 1611 is electrically connected to the second soldering terminal 163b.

[0094] It is understood that capacitor 1611 is electrically connected to antenna radiator 161 through second circuit board 163, which can provide a reliable mechanical connection, reduce the risk of connection failure, and the parameters of capacitor 1611 on second circuit board 163 can be flexibly adjusted according to specific needs to optimize charging performance and antenna performance.

[0095] In another specific configuration, capacitor 1611 is electrically connected to the first terminal 161a and the second terminal 161b via a second circuit board 163, such as Figure 7B As shown, the second circuit board 163 includes a first metal spring group and a second metal spring group. The first metal spring group includes at least one first metal spring 1631, and the second metal spring group includes at least one second metal spring 1632. The first metal spring group is electrically connected to a first terminal 161a, and the second metal spring group is electrically connected to a second terminal 161b. The number of first metal springs 1631 and second metal springs 1632 is the same as the number of capacitors 1611. Figure 7B The example uses four first metal springs 1631 and four second metal springs 1632. The first electrode of each capacitor 1611 is electrically connected to the corresponding first metal spring 1631, and the second electrode is electrically connected to the corresponding second metal spring 1632.

[0096] It is understandable that using a metal spring to achieve an electrical connection between the capacitor 1611 and the antenna radiator 161 can provide a stable electrical connection, mechanical buffering, absorption of vibration and shock, and adaptation to miniaturized devices, thus contributing to the compactness of the wearable device 100.

[0097] In some embodiments, see Figure 3A or Figure 3B The surface of the wireless charging coil 150 facing the antenna radiator 161 can be coated with a magnetic material to confine the magnetic field and reduce its effect on the antenna radiator 161. However, in some embodiments, the antenna radiator 161 has a protrusion 1610 that protrudes towards the wireless charging coil 150, and the wireless charging coil 150 is arranged around the protrusion 1610. That is, the protrusion 1610 is located inside the wireless charging coil 150, which limits the effect of the magnetic material on the surface of the wireless charging coil 150.

[0098] In the embodiments described above, by providing a slot 161A and a series capacitor 1611 on the antenna radiator 161, the problem of limited effectiveness of magnetic materials can be solved, regardless of the structure of the antenna radiator 161. Therefore, the solution implemented in this application has a wide range of applications.

[0099] In some embodiments, such as Figure 7A As shown, the slot 161A has an elongated shape within the plane of the antenna radiator 161. In other embodiments, the shape of the slot 161A within the plane of the antenna radiator 161 can be as follows: Figure 8A The shape shown is a triangle, or other geometric shapes such as circles or ellipses. Alternatively, the shape of the slot 161A within the plane of the antenna radiator 161 can be as follows: Figure 8B The irregular shape shown. It should be noted that this application does not limit the shape of the slot 161A.

[0100] In some embodiments, reference is made to Figure 7A , Figure 8A and Figure 8B The slotted antenna radiator 161A extends from the center of the antenna radiator 161 towards its edge, and may form an opening at the edge of the antenna radiator 161. Alternatively, in other embodiments, the slotted antenna radiator 161A extends from the center of the antenna radiator 161 towards its edge, without forming an opening at the edge of the antenna radiator 161. This application does not limit whether the slotted antenna radiator 161A forms an opening at its edge, nor does it limit the size of the opening.

[0101] Furthermore, it should be noted that this application does not limit the dimensions of the slot 161A.

[0102] For example, such as Figure 8C As shown, taking the slot 161A as an example, the extension direction of the slot 161A is the X direction, which is perpendicular to the Z direction. The dimension of the antenna radiator 161 in the X direction is x1, and the dimension of the slot 161A in the X direction is x2. The ratio of x2 to x1, i.e., x2 / x1, can range from 0.5 to 1. This effectively blocks the formation of most eddy currents.

[0103] In this application embodiment, simulation tests were conducted on wireless charging scenarios under different schemes. For example, for Figure 3A In the illustrated scheme, the antenna radiator 161 is a fully enclosed metal conductor. When the wireless charging coil 150 operates based on current parameters of Itx_RMS of 1.77 amps (A) and Iout of 0.654 amps (A), the eddy current loss on the antenna radiator 161 is measured to be 273.71 mW. And for... Figure 7BIn the illustrated scheme, the antenna radiator 161 has a slot 161A and a 100pF capacitor 1611 connected in series. Similarly, when the wireless charging coil 150 operates with current parameters of Itx_RMS of 1.77 amps (A) and Iout of 0.654 amps (A), the eddy current loss on the antenna radiator 161 is measured to be only 79.81 milliwatts (mW). Clearly, this embodiment of the application, by providing a slot 161A and a series capacitor 1611 on the antenna radiator 161, can effectively reduce the eddy current loss on the antenna radiator 161 when the wireless charging coil 150 is operating.

[0104] It should be understood that in the embodiments of this application, terms such as "for example," "in some embodiments," "in other embodiments," and "exemplarily" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as an "example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the term "example" is intended to present concepts in a concrete manner.

[0105] It should be noted that in the examples and description of this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0106] Although this application has been illustrated and described with reference to certain preferred embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made thereto without departing from the scope of this application.

Claims

1. An electronic device, characterized in that, include: Wireless charging coil; An antenna radiator is located on one side of the wireless charging coil. The antenna radiator is located within the magnetic field generated when the wireless charging coil is energized. The antenna radiator has a slot that extends from the middle of the antenna radiator to its edge. One side of the slot along its width direction is the first end of the antenna radiator, and the other side of the slot along its width direction is the second end of the antenna radiator. At least one capacitor is connected in series between the first terminal and the second terminal.

2. The electronic device according to claim 1, characterized in that, The wireless charging coil has a first operating frequency, and the antenna radiator has a second operating frequency, wherein the first operating frequency is less than the second operating frequency.

3. The electronic device according to claim 2, characterized in that, The second operating frequency is more than 6 times the first operating frequency.

4. The electronic device according to claim 3, characterized in that, The first operating frequency range includes 100kHz to 20MHz. The second operating frequency ranges from 600MHz to 6GHz.

5. The electronic device according to claim 2, characterized in that, The antenna radiator is formed in the first circuit board. The capacitor is soldered to the first circuit board.

6. The electronic device according to claim 2, characterized in that, The antenna radiator is a metal plate. The capacitor is integrated in the second circuit board. The first electrode of the capacitor is electrically connected to the first terminal through the second circuit board, and the second electrode of the capacitor is electrically connected to the second terminal through the second circuit board.

7. The electronic device according to claim 6, characterized in that, The second circuit board includes a first soldering terminal and a second soldering terminal. The first electrode of the capacitor is electrically connected to the first soldering terminal, and the second electrode of the capacitor is electrically connected to the second soldering terminal. The second circuit board is soldered to the first end via the first soldering end, and to the second end via the second soldering end.

8. The electronic device according to claim 6, characterized in that, The second circuit board includes a first metal contact spring group and a second metal contact spring group. The first electrode of the capacitor is electrically connected to the metal contact spring in the first metal contact spring group. The second electrode of the capacitor is electrically connected to the metal spring in the second metal spring assembly; and... The second circuit board is electrically connected to the first terminal through the first metal spring group and to the second terminal through the second metal spring group.

9. The electronic device according to any one of claims 1-8, characterized in that, The axis of the wireless charging coil intersects the plane of the antenna radiator.

10. The electronic device according to claim 9, characterized in that, The axis of the wireless charging coil is perpendicular to the plane of the antenna radiator, and... The antenna radiator and the wireless charging coil are spaced apart along a first direction, which is parallel to the axis. Alternatively, the antenna radiator has a protrusion that faces the wireless charging coil, and the wireless charging coil is arranged around the protrusion.

11. The electronic device according to claim 8, characterized in that, The electronic device also includes: floor; A power supply element, located between the floor and the antenna radiator, is used to supply power to the antenna radiator.

12. The electronic device according to claim 1, characterized in that, The at least one capacitor includes a plurality of capacitors, which are arranged sequentially along the extension direction of the slot.

13. The electronic device according to claim 1, characterized in that, The antenna radiator is a polygonal or circular plate.

14. The electronic device according to claim 1, characterized in that, The slot in the plane of the antenna radiator can be elongated, triangular, circular, elliptical, or irregular in shape.

15. A terminal antenna, characterized in that, include: An antenna radiator having a slot extending from the middle of the antenna radiator to its edge, with one side of the slot along its width direction being a first end of the antenna radiator and the other side of the slot along its width direction being a second end of the antenna radiator. At least one capacitor is connected in series between the first terminal and the second terminal.

16. The terminal antenna according to claim 15, characterized in that, The antenna radiator is formed in the first circuit board. The capacitor is soldered to the first circuit board.

17. The terminal antenna according to claim 15, characterized in that, The antenna radiator is a metal plate. The capacitor is integrated in the second circuit board. The first electrode of the capacitor is electrically connected to the first terminal through the second circuit board, and the second electrode of the capacitor is electrically connected to the second terminal through the second circuit board.

18. The terminal antenna according to claim 17, characterized in that, The second circuit board includes a first soldering terminal and a second soldering terminal. The first electrode of the capacitor is electrically connected to the first soldering terminal, and the second electrode of the capacitor is electrically connected to the second soldering terminal. The second circuit board is soldered to the first end via the first soldering end, and to the second end via the second soldering end.

19. The terminal antenna according to claim 17, characterized in that, The second circuit board includes a first metal contact spring group and a second metal contact spring group. The first electrode of the capacitor is electrically connected to a metal contact spring in the first metal contact spring group, and the second electrode of the capacitor is electrically connected to a metal contact spring in the second metal contact spring group. The second circuit board is electrically connected to the first terminal through the first metal spring group and to the second terminal through the second metal spring group.

20. The terminal antenna according to claim 15, characterized in that, The antenna radiator is a polygonal or circular plate.

21. The terminal antenna according to claim 15, characterized in that, The slot in the plane of the antenna radiator can be elongated, triangular, circular, elliptical, or irregular in shape.

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