Antenna device and electronic equipment

Abstract

The invention relates to an antenna device and electronic equipment, the antenna device comprises a near field communication chip, a first impedance matching circuit, a second impedance matching circuit, a first radiator, a second radiator, a third radiator and a fourth radiator, the first impedance matching circuit comprises a first series capacitor unit and a first parallel capacitor unit, and the second impedance matching circuit comprises a second series capacitor unit and a third parallel capacitor unit; two ends of the first parallel capacitor unit are respectively connected with the first radiator and the second radiator; the second impedance matching circuit comprises a second series capacitor unit and a second parallel capacitor unit, and the two ends of the second parallel capacitor unit are connected with the third radiator and the fourth radiator respectively, so that the two radiators can multiplex the same impedance matching circuit; the layout area of the impedance matching circuit on the circuit board can be simplified, and the wiring design of the circuit board is simplified.

Description

Technical Field

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

[0002] Near Field Communication (NFC) is a short-range wireless communication technology primarily used for fast and secure data exchange between devices (typically within 10 centimeters). Due to its short-range transmission, low power consumption, and RFID compatibility, NFC is now present in most electronic devices.

[0003] NFC technology can be widely used in public transportation (such as subway and bus card payments), mobile payments, identity recognition and access control, rapid pairing of IoT devices, and information exchange. To improve the radiation performance of NFC communication, multiple NFC antennas are used to support near-field communication.

[0004] However, as electronic devices become increasingly thinner and lighter, the design space on their circuit boards is limited. How to route multiple NFC antennas within this limited space has become a pressing technical problem that needs to be solved. Summary of the Invention

[0005] This application provides an antenna device that simplifies circuit board wiring design and reduces circuit board trace length, as well as other antenna devices and electronic devices.

[0006] In a first aspect, this application provides an antenna device, comprising:

[0007] A near-field communication chip includes a first transmitter and a second transmitter, wherein the first transmitter is used to provide a first power supply signal and the second transmitter is used to provide a second power supply signal;

[0008] The first impedance matching circuit includes a first serial capacitor unit and a first parallel capacitor unit. The first end of the first serial capacitor unit is connected to the first transmitter, and the second end of the first serial capacitor unit is connected to the first end of the first parallel capacitor unit.

[0009] The second impedance matching circuit includes a second serial capacitor unit and a second parallel capacitor unit. The first end of the second serial capacitor unit is connected to the second transmitter, and the second end of the second serial capacitor unit is connected to the first end of the second parallel capacitor unit.

[0010] The first radiator has its feed point connected to the first terminal of the first parallel capacitor unit, and its ground point is connected to the common ground terminal.

[0011] The second radiator has its feed point connected to the second end of the first parallel capacitor unit, and its ground point is connected to the common ground.

[0012] The third radiator has its feed point connected to the first end of the second parallel capacitor unit, and the grounding point of each third radiator is connected to the common ground.

[0013] The fourth radiator has its feed point connected to the first end of the second parallel capacitor unit, and the grounding point of each fourth radiator is connected to a common ground.

[0014] In this embodiment, the antenna device includes a near-field communication chip, a first impedance matching circuit, a second impedance matching circuit, and at least four radiators. The first and second radiators can reuse the first impedance matching circuit to adjust their impedance and resonant frequency. The third and fourth radiators reuse the second impedance matching circuit to adjust their impedance and resonant frequency, thereby achieving maximum power transmission. This avoids the need for a separate impedance matching circuit for each radiator, reducing costs and simplifying the layout area of ​​the impedance matching circuits on the circuit board, as well as simplifying the circuit board wiring design.

[0015] Furthermore, during the transmission of the first and second feed signals provided by the near-field communication chip, the first feed signal can be transmitted to the first serial capacitor unit and then to the first and second radiators; the second feed signal can be transmitted to the second serial capacitor unit and then to the third and fourth radiators. That is, in the link from the near-field communication chip to the corresponding serial capacitor unit, the transmission path from the near-field communication chip to the corresponding serial capacitor unit can be reused, which can reduce the loss of the transmission link. The positions of the first and second serial capacitor units on the circuit board can also be flexibly set. For example, the first serial capacitor unit can be placed on the circuit board near the first and second radiators, and the second serial capacitor unit can be placed on the circuit board near the third and fourth radiators. In this way, the wiring design of the circuit board can be further simplified and the trace length of the circuit board can be reduced.

[0016] Secondly, this application provides an antenna device, comprising:

[0017] A near-field communication chip includes a first transmitter and a second transmitter, wherein the first transmitter is used to provide a first power supply signal and the second transmitter is used to provide a second power supply signal;

[0018] A first transmission line is connected to the first transmitting end;

[0019] The third impedance matching circuit includes at least two first impedance matching branches, the first end of each first impedance matching branch is connected to the first transmission line, and the second end of each first impedance matching branch is connected to the common ground.

[0020] The second transmission line is connected to the second transmitter.

[0021] The fourth impedance matching circuit includes at least two second impedance matching branches, the first end of each second impedance matching branch is connected to the second transmission line, and the second end of each second impedance matching branch is connected to the common ground.

[0022] At least two fifth radiators, the feed point of each fifth radiator is respectively connected to the third end of a first impedance matching branch, and the ground point of each fifth radiator is connected to a common ground.

[0023] At least two sixth radiators, each of which has a feed point connected to the third terminal of a second impedance matching branch, and a ground point connected to a common ground terminal.

[0024] In this embodiment, the antenna device includes at least two fifth radiators, at least two sixth radiators, a near-field communication chip, a first transmission line, a second transmission line, a third impedance matching circuit, and a fourth impedance matching circuit. Each first impedance matching branch can reuse the same first transmission line to connect to the first transmitter to transmit a first feed signal, and each second impedance matching branch can reuse the same second transmission line to connect to the second transmitter to transmit a second feed signal. Each impedance matching branch is connected to the corresponding transmitter via a transmission line, which simplifies the circuit board wiring design and reduces the circuit board trace length.

[0025] Furthermore, each radiator is configured with an impedance matching branch to achieve impedance matching and resonant frequency adjustment. This allows the impedance and resonant frequency of each radiator to be matched, ensuring that the performance of each first radiator in radiating NFC signals is optimized, thereby improving the performance of the antenna device in radiating NFC signals. Each impedance matching circuit is connected in parallel with at least two radiators. The number of radiators connected to each impedance matching circuit is at least one more than in related technologies. The total equivalent inductance / inductance value of the at least two radiators connected in parallel with the same impedance matching circuit is lower than the equivalent inductance / inductance value of a single radiator. Therefore, the antenna device provided in this application embodiment can increase its oscillation current, thereby increasing the induced electromotive force of the peer device communicating with the antenna device in the near field.

[0026] Thirdly, this application provides an electronic device, including: a circuit board and the aforementioned antenna device, wherein the near-field communication chip, the first impedance matching circuit, and the second impedance matching circuit in the antenna device are respectively disposed on the circuit board, or the near-field communication chip, the first transmission line, the third impedance matching circuit, the second transmission line, and the fourth impedance matching circuit in the antenna device are respectively disposed on the circuit board.

[0027] The aforementioned antenna devices and electronic devices include those that can simplify circuit board wiring design and reduce circuit board trace length. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of an electronic device according to an embodiment;

[0030] Figure 2 This is one of the structural schematic diagrams of an antenna device according to an embodiment;

[0031] Figure 3 This is a second schematic diagram of the antenna device according to one embodiment;

[0032] Figure 4 This is the third schematic diagram of the antenna device according to one embodiment;

[0033] Figure 5 This is a fourth schematic diagram of the antenna device according to one embodiment;

[0034] Figure 6 This is one of the schematic diagrams illustrating the structure of an antenna device in an electronic device according to an embodiment;

[0035] Figure 7 This is the fifth schematic diagram of the antenna device according to one embodiment;

[0036] Figure 8 This is a second schematic diagram of the structure of an antenna device in an electronic device according to one embodiment;

[0037] Figure 9 This is a schematic diagram of the antenna device according to one embodiment;

[0038] Figure 10 This is the seventh schematic diagram of the antenna device according to one embodiment;

[0039] Figure 11 This is the eighth schematic diagram of the antenna device according to one embodiment;

[0040] Figure 12 This is a schematic diagram of the antenna device according to one embodiment;

[0041] Figure 13 This is the third schematic diagram of the structure of an antenna device in an electronic device according to one embodiment;

[0042] Figure 14 This is the fourth schematic diagram of the structure of an antenna device in an electronic device according to one embodiment;

[0043] Figure 15 Fifth schematic diagram of the structure of an antenna device in an electronic device according to an embodiment;

[0044] Figure 16 This is the sixth schematic diagram of the structure of an antenna device in an electronic device according to one embodiment;

[0045] Figure 17 This is a block diagram of the internal structure of an electronic device in one embodiment. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0047] It is understood that the terms "first," "second," etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intervening element present.

[0048] The electronic devices involved in the embodiments of this application can be handheld devices, in-vehicle devices, smart cars, wearable devices, computing devices or other processing devices connected to a wireless modem, as well as various forms of user equipment (UE) (e.g., mobile phones), mobile stations (MS), etc. For ease of description, the devices mentioned above are collectively referred to as electronic devices.

[0049] like Figure 1 As shown, in one embodiment, a mobile phone is used as an example for explanation. The electronic device 10 includes a display assembly 11 and a housing (not shown in the figure). The display assembly 11 includes a display screen, which can be an OLED (Organic Light-Emitting Diode) screen or an LCD (Liquid Crystal Display) screen. The display assembly 11 can be used to display information and provide an interactive interface for the user. The shape of the display screen can be rectangular or rounded rectangle. A rounded rectangle is sometimes also called a rounded rectangle, meaning that the four corners of the rectangle are rounded, and the four sides of the rectangle are approximately straight lines.

[0050] The housing includes a frame 12 and a rear cover. The frame 12 can be made of a metal material such as aluminum alloy, magnesium alloy, or stainless steel, or it can be made of an insulating material such as plastic. The frame 12 is located on the outer periphery of the display assembly 11 to support and protect the display assembly 11. The frame 12 can further extend into the antenna device to form a middle plate; the integrally formed middle plate and frame 12 are sometimes referred to as a mid-frame. Optionally, the middle plate and frame 12 can also be a separate structure. The rear cover is located on the side facing away from the displayable area of ​​the display and is connected to the frame 12. Furthermore, the display assembly 11 and the rear cover are located on opposite sides of the middle plate.

[0051] The frame 12 is generally rectangular, comprising a first frame A and a second frame B arranged opposite to each other, and a third frame C and a fourth frame D arranged opposite to each other. The first frame A, third frame C, second frame B, and fourth frame D are connected sequentially, with the length of the third frame C being greater than the length of the first frame A. It can be understood that the first frame A is the top frame of the electronic device, the second frame B is the bottom frame of the electronic device, and the third frame C and fourth frame D correspond to the side frames of the electronic device, respectively. Specifically, the connections between the frames can be right-angle connections or arc transition connections. Furthermore, when the frame is a conductive frame, at least a portion of the conductive frame serves as an antenna radiator to receive / transmit radio frequency signals. This portion of the frame serving as the radiator can have gaps with other parts of the middle plate, thereby ensuring a good radiation environment for the antenna radiator. In one embodiment, a gap or aperture can be provided at the portion of the conductive frame serving as the radiator to facilitate antenna radiation. This portion of the conductive frame serving as the radiator can be formed by a slit provided on the conductive frame.

[0052] The back cover is located on the side facing away from the display area and is connected to the mid-frame. Furthermore, the display assembly 11 and the back cover are located on opposite sides of the mid-frame. The back cover is connected to the frame 12 to define a receiving cavity, i.e., an installation space, for mounting electronic components such as batteries, circuit boards, and camera modules of the electronic device. The circuit board can be a PCB (Printed Circuit Board) or an FPC (Flexible Printed Circuit). The circuit board can integrate functional devices such as processors, storage units, power management modules, baseband chips, cameras, sensors, and receivers of the electronic device.

[0053] The electronic device may also include a ground plane. The ground plane can form a common ground of the electronic device 10, and can be a plane or structure with zero potential, or a common ground terminal of an antenna device. Exemplarily, the ground plane can be formed by conductors, printed circuits, or metal printed layers in the electronic device; or, the ground plane can be formed on a circuit board (e.g., a PCB), small board, or other carrier board of the electronic device 10. In an exemplary embodiment, a frame 12 surrounds the ground plane, and it can be understood that the ground plane is disposed within the receiving space formed by the frame 12. The shape of the ground plane is generally rectangular. It should be noted that the above are several examples of ground planes and should not be construed as limiting the ground planes provided in the embodiments of this application.

[0054] The following description, in conjunction with the accompanying drawings, illustrates the specific structure of the antenna device included in the electronic device.

[0055] like Figure 2 As shown, the antenna device includes a Near Field Communication (NFC) chip 120, a first impedance matching circuit 140, a second impedance matching circuit 160, and a first radiator 171, a second radiator 172, a third radiator 173, and a fourth radiator 174.

[0056] For example, the near-field communication chip 120, the first impedance matching circuit 140, and the second impedance matching circuit 160 in the antenna device can be respectively disposed on the circuit board of the electronic device.

[0057] The near-field communication chip 120 includes a first transmitter TX1 and a second transmitter TX2. The first transmitter TX1 is used to provide a first power supply signal, and the second transmitter TX2 is used to provide a second power supply signal.

[0058] For example, the first feed signal and the second feed signal can be differential signals with equal frequency and amplitude but opposite phase, such as differential signals with a phase difference of 180 degrees and the same amplitude. For example, the phase of the first feed signal can be 180 degrees and the phase of the second feed signal can be 0 degrees. Optionally, the phase of the first feed signal can be 90 degrees and the phase of the second feed signal can be -90 degrees.

[0059] Optionally, the first feed signal and the second feed signal are feed signals with the same frequency and the same phase.

[0060] In an exemplary embodiment, the first feed signal and the second feed signal are frequencies corresponding to near-field communication signals, such as the center frequency of the NFC communication band.

[0061] In an optional embodiment, the near-field communication chip 120 may also provide baseband processing capabilities for near-field communication signals.

[0062] The first impedance matching circuit 140 is connected to the first transmitter TX1. The first impedance matching circuit 140 is also used to achieve impedance matching between the first radiator 171, the second radiator 172 and the near-field communication chip 120, and to adjust the resonant frequency.

[0063] The first impedance matching circuit 140 includes a first serial capacitor unit 141 and a first parallel capacitor unit 142. A first terminal of the first serial capacitor unit 141 is connected to the first transmitter TX1; a second terminal of the first serial capacitor unit 141 is connected to the first terminal of the first parallel capacitor unit 142. The first terminal of the first parallel capacitor unit 142 is the first terminal of the first impedance matching circuit 140 and can be connected to the first radiator 171; the second terminal of the first parallel capacitor unit 142 is the second terminal of the first impedance matching circuit 140 and can be connected to the second radiator 172.

[0064] The first serial capacitor unit 141 provides impedance matching for the transmission path of the first feed signal, thereby achieving impedance matching between the first radiator 171, the second radiator 172, and the near-field communication chip 120. The first serial capacitor unit 141 and the first parallel capacitor unit 142 can form a resonant circuit (or oscillation circuit) with the equivalent inductance of the correspondingly connected first radiator 171 and second radiator 172. For example, by adjusting the capacitance values ​​of the first serial capacitor unit 141 and the first parallel capacitor unit 142, their resonant frequency can be adjusted to obtain maximum power transmission. The resonant frequency can be the frequency of the near-field communication signal, for example, 13.56MHz, or the difference between its resonant frequency and the frequency of the near-field communication signal is within a preset range, enabling near-field wireless communication. The capacitance value of the first parallel capacitor unit 142 plays a major role in adjusting its resonant frequency, while the capacitance value of the first serial capacitor unit 141 plays an auxiliary role.

[0065] The second impedance matching circuit 160 is connected to the second transmitter TX2. The second impedance matching circuit 160 is also used to achieve impedance matching between the third radiator 173 and the fourth radiator 174 and the near-field communication chip 120, and to adjust the resonant frequency.

[0066] The second impedance matching circuit 160 includes a second serial capacitor unit 161 and a second parallel capacitor unit 162.

[0067] The first end of the second serial capacitor unit 161 is connected to the second transmitter TX2; the second end of the second serial capacitor unit 161 is connected to the first end of the second parallel capacitor unit 162. The first end of the second parallel capacitor unit 162 is the first end of the second impedance matching circuit 160, which can be connected to the third radiator 173; the second end of the second parallel capacitor unit 162 is the second end of the second impedance matching circuit 160, which can be connected to the fourth radiator 174.

[0068] The second serial capacitor unit 161 provides impedance matching for the transmission path of the second feed signal, thereby achieving impedance matching between each second radiator 180 and the near-field communication chip 120. The second serial capacitor unit 161 and the second parallel capacitor unit 162 can form a resonant circuit (or oscillation circuit) with the equivalent inductance of the correspondingly connected third radiator 173 and fourth radiator 174. For example, by adjusting the capacitance values ​​of the second serial capacitor unit 161 and the second parallel capacitor unit 162, their resonant frequency can be adjusted, thereby obtaining maximum power transmission. The capacitance value of the second serial capacitor unit 161 plays a primary role in adjusting its resonant frequency, while the capacitance value of the second parallel capacitor unit 162 plays an auxiliary role.

[0069] In some exemplary embodiments, the first radiator 171, the second radiator 172, the third radiator 173, and the fourth radiator 174 can all support the radiation of near-field communication signals. For example, the first radiator 171, the second radiator 172, the third radiator 173, and the fourth radiator 174 can all support at least one of receiving and transmitting near-field communication signals.

[0070] In some exemplary embodiments, the first radiator 171, the second radiator 172, the third radiator 173, and the fourth radiator 174 may each include a first end and a second end disposed opposite to each other, wherein one of the power supply point and the grounding point is disposed at the first end, and the other of the power supply point and the grounding point is disposed at the second end.

[0071] The electrical connections between each impedance matching circuit and the feed point on each radiator include direct electrical connections between the two structures, or indirect electrical connections through other components. In this embodiment, the impedance matching circuit can be electrically connected to the feed point on the radiator through the feed structure. Optionally, the feed structure includes, but is not limited to, feed springs, conductive screws, coaxial lines, microstrip lines, etc. In this embodiment, for ease of explanation, a feed spring is used as an example of the feed structure.

[0072] In some exemplary embodiments, the number of the first radiator 171, the second radiator 172, the third radiator 173, and the fourth radiator 174 may be the same or different. In the embodiments of this application, the number of the first radiator 171, the second radiator 172, the third radiator 173, and the fourth radiator 174 is not specifically limited.

[0073] In some exemplary embodiments, the first radiator 171, the second radiator 172, the third radiator 173, and the fourth radiator 174 may be one of the following: a flexible printed circuit (FPC) radiator, a laser direct forming (LDS) radiator, a print direct forming (PDS) radiator, a metal radiator, and a mode decoration antenna (MDA). In the embodiments of this application, the types of the first radiator 171, the second radiator 172, the third radiator 173, and the fourth radiator 174 are not further limited. In practical applications, the shape, size, and quantity of the first radiator 171, the second radiator 172, the third radiator 173, and the fourth radiator 174 can be set according to actual needs.

[0074] In this embodiment, the antenna device includes a near-field communication chip, a first impedance matching circuit, a second impedance matching circuit, and at least four radiators. The first and second radiators can reuse the first impedance matching circuit to adjust their impedance and resonant frequency; the third and fourth radiators can reuse the second impedance matching circuit to adjust their impedance and resonant frequency, thereby achieving maximum power transmission. This avoids the need for a separate impedance matching circuit for each radiator, reducing costs and simplifying the layout area of ​​the impedance matching circuits on the circuit board, as well as simplifying the circuit board wiring design. Furthermore, each impedance matching circuit is connected to at least two radiators, increasing the number of radiators connected to each impedance matching circuit by at least one compared to related technologies. Therefore, the antenna device provided in this embodiment can increase its oscillation current, thereby increasing the induced electromotive force of the peer device communicating with the antenna device in the near field.

[0075] Furthermore, during the transmission of the first and second feed signals provided by the near-field communication chip, the first feed signal can be transmitted to the first serial capacitor unit and then to each of the first and second radiators; the second feed signal can be transmitted to the second serial capacitor unit and then to each of the third and fourth radiators. That is, in the link from the near-field communication chip to the corresponding serial capacitor unit, the transmission path from the near-field communication chip to the corresponding serial capacitor unit can be reused, which can reduce the loss of the transmission link. The positions of the first and second serial capacitor units on the circuit board can also be flexibly set. For example, the first serial capacitor unit can be placed on the circuit board near the first and second radiators, and the second serial capacitor unit can be placed on the circuit board near the third and fourth radiators. In this way, the wiring design of the circuit board can be further simplified and the trace length of the circuit board can be reduced.

[0076] like Figure 3 As shown, in an exemplary embodiment, the first serial capacitor unit 141 may include one or at least two first capacitors C1, and the first parallel capacitor unit 142 may include one or at least two second capacitors C2. For example, the first serial capacitor unit 141 may include at least two first capacitors C1 connected in parallel, and the first parallel capacitor unit 142 may include at least two second capacitors C2 connected in parallel. The first end of the first capacitor C1 is connected to the first transmitter TX1, and the second end of the first capacitor C1 is connected to the first end of the second capacitor C2. The first end of the second capacitor C2 is the first end of the first parallel capacitor unit 142, used to connect to the feed point of the first radiator 171. The second end of the second capacitor C2 is the second end of the first parallel capacitor unit 142, used to connect to the feed point of the second radiator 172.

[0077] Please continue to refer to this. Figure 3The second serial capacitor unit 161 may include one or at least two third capacitors C3, and the second parallel capacitor unit 162 may include one or at least two fourth capacitors C4. For example, the second serial capacitor unit 161 may include at least two third capacitors C3 connected in parallel, and the second parallel capacitor unit 162 may include at least two fourth capacitors C4 connected in parallel. The first terminal of the third capacitor C3 is connected to the second transmitter TX2, and the second terminal of the third capacitor C3 is connected to the first terminal of the fourth capacitor C4. The first terminal of the fourth capacitor C4 is the first terminal of the second parallel capacitor unit 162, used to connect to the feed point of the third radiator 173. The second terminal of the fourth capacitor C4 is the second terminal of the second parallel capacitor unit 162, used to connect to the feed point of the fourth radiator 174.

[0078] In practical applications, the capacitance values ​​and quantities of the first capacitor C1, second capacitor C2, third capacitor C3, and fourth capacitor C4 can be set according to requirements. Specifically, the capacitance values ​​of the first capacitors C1 in the first impedance matching circuit 140 can be the same or different, as can the capacitance values ​​of the second capacitors C2; similarly, the capacitance values ​​of the third capacitors C3 and the fourth capacitors C4 in the second impedance matching circuit 160 can be the same or different. Due to limitations imposed by factors such as the appearance of the electronic device, antenna architecture, and structural conditions, the quantity and type of the first radiator 171, second radiator 172, third radiator 173, and fourth radiator 174 cannot be completely identical or symmetrical. In this embodiment, the capacitance values ​​of the first capacitor C1, second capacitor C2, third capacitor C3, and fourth capacitor C4 in the corresponding impedance matching circuit can be set according to the number and type of the first radiator 171, second radiator 172, third radiator 173, and fourth radiator 174. By reasonably setting the capacitance values ​​of each capacitor, the resonance between the first impedance matching circuit 140 and the first radiator 171 and second radiator 172, the resonance between the second impedance matching circuit 160 and the third radiator 173 and fourth radiator 174, and the impedance matching between the near-field communication chip 120 and the first radiator 171, second radiator 172, third radiator 173, and fourth radiator 174 can be achieved, so that the performance of the first radiator 171, second radiator 172, third radiator 173, and fourth radiator 174 in radiating NFC signals can reach the optimal level, thus improving the performance of the antenna device in radiating NFC signals.

[0079] like Figure 4 and Figure 5 As shown, in an exemplary embodiment, the antenna device includes a first balun circuit 130 and a second balun circuit 150.

[0080] The first balun circuit 130 includes an input coil and an output coil. The first end of the input coil is connected to the first transmitting end TX1, the second end of the input coil is connected to the common ground end, and the first and second ends of the output coil are respectively connected to the first impedance matching circuit 140.

[0081] The first balun circuit 130 is used to convert the first feed signal into a differential signal output. For example, the first balun circuit 130 can convert the first feed signal into two differential signals, a first differential signal and a second differential signal, with a phase difference of 180 degrees. The first differential signal is output from a first terminal of the output coil, and the second differential signal is output from a second terminal of the output coil. The first feed signal, the first differential signal, and the second differential signal have the same frequency and amplitude.

[0082] The first impedance matching circuit 140 is connected to the first and second ends of the output coil of the first balun circuit 130, respectively, to receive the first differential signal and the second differential signal output by the first balun circuit 130. For example, the first end of the output coil of the first balun circuit 130 is connected to the first end of the first parallel capacitor unit 142, and the second end of the output coil of the first balun circuit 130 is connected to the second end of the first parallel capacitor unit 142. The first serial capacitor unit 141 is connected in series between the output coil of the first balun circuit 130 and the first parallel capacitor unit 142. Exemplarily, the first serial capacitor unit 141 can be connected in series between the first end of the output coil of the first balun circuit 130 and the first end of the first parallel capacitor unit 142, or it can be connected in series between the second end of the output coil of the first balun circuit 130 and the second end of the first parallel capacitor unit 142.

[0083] The first differential signal output by the first balun circuit 130 can be transmitted to the first radiator 171 via the first matching impedance circuit 140, and the second differential signal output by the first balun circuit 130 can be transmitted to the second radiator 172 via the first matching impedance circuit 140.

[0084] The second balun circuit 150 includes an input coil and an output coil. The first end of the input coil is connected to the second transmitter TX2, the second end of the input coil is connected to the common ground, and the first and second ends of the output coil are respectively connected to the second impedance matching circuit 160.

[0085] The second balun circuit 150 is used to convert the second feed signal into a differential signal output. For example, the second balun circuit 150 can convert the second feed signal into two differential signals, a third and a fourth, with a phase difference of 180 degrees. The third differential signal is output from the first terminal of the output coil, and the fourth differential signal is output from the second terminal of the output coil. The second feed signal, the third differential signal, and the fourth differential signal have the same frequency and amplitude.

[0086] The first end of the output coil of the second balun circuit 150 is connected to the first end of the second parallel capacitor unit 162, and the second end of the output coil of the second balun circuit 150 is connected to the second end of the second parallel capacitor unit 162. The second series capacitor unit 161 is connected in series between the output coil of the second balun circuit 150 and the second parallel capacitor unit 162. For example, the second series capacitor unit 161 can be connected in series between the first end of the output coil of the second balun circuit 150 and the first end of the second parallel capacitor unit 162, or it can be connected in series between the second end of the output coil of the second balun circuit 150 and the second end of the second parallel capacitor unit 162.

[0087] The third differential signal output by the second balun circuit 150 can be transmitted to the third radiator 173 via the second matching impedance circuit 160, and the fourth differential signal output by the second balun circuit 150 can be transmitted to the fourth radiator 174 via the second matching impedance circuit 160.

[0088] In practical applications, the first and second balun circuits have impedance transformation functions, and the capacitance values ​​of each capacitor in the first and second matching circuits can be set based on the equivalent inductance of the first and second balun circuits. In this embodiment, the capacitance values ​​of each capacitor in the first and second matching circuits are different from the capacitance values ​​of each capacitor in the first and second matching circuits in the aforementioned antenna device without first and second balun circuits.

[0089] In the embodiments of this application, the first balun circuit and the second balun circuit, through balanced-to-unbalanced conversion, can achieve common-mode rejection, effectively suppressing common-mode interference signals and improving signal transmission performance. Furthermore, by setting the first balun circuit and the second balun circuit, which have impedance transformation functions and do not require specific equivalent inductance from each radiator, the design flexibility of each radiator can be improved. For example, the types of radiators include, but are not limited to, radiators formed using in-mold decoration (MDA) technology and radiators formed using computer numerical control (CNC) technology.

[0090] Furthermore, the output coils of the first and second balun circuits can be equivalent to a transmission trace. The first and second radiators are essentially connected in series, and the first differential signal transmitted to the first radiator is 180 degrees out of phase with the second differential signal transmitted to the second radiator. This avoids the requirement that the opening directions of the first and second radiators in the multiplexed impedance matching circuit must be consistent, thus improving the design flexibility of the first and second radiators. Similarly, the third and fourth radiators are essentially connected in series, and the third differential signal transmitted to the third radiator is 180 degrees out of phase with the fourth differential signal transmitted to the fourth radiator. This avoids the requirement that the opening directions of the third and fourth radiators in the multiplexed impedance matching circuit must be consistent, further improving the design flexibility of the third and fourth radiators.

[0091] like Figure 6 As shown in the embodiments of this application, for ease of explanation, the first radiator 171, the second radiator 172, the third radiator 173, and the fourth radiator 174 are examples of portions of the conductive frame of an electronic device. Each radiator can be formed by creating a slit in the conductive frame.

[0092] The opening direction of each radiator is related to the distribution of the feed point and ground point on the radiator. It can be understood that the opening direction of each radiator is related to the distribution direction of the current on the radiator. For example, for ease of explanation, taking the direction from the ground point of the radiator to the feed point as a reference, if the current direction on the radiator is counterclockwise, its opening direction is counterclockwise; if the current direction on the radiator is clockwise, its opening direction is clockwise.

[0093] In an optional embodiment, the direction of the current can be taken as the reference from the feed point of the radiator to the ground point. If the current direction on the radiator is counterclockwise, its opening direction is counterclockwise; if the current direction on the radiator is clockwise, its opening direction is clockwise.

[0094] Please continue to refer to this. Figure 3 and Figure 5The feed point of the first radiator 171 is connected to the first end of the first parallel capacitor unit 142, and the feed point of the second radiator 172 is connected to the second end of the first parallel capacitor unit 142. For example, the first radiator 171 and the second radiator 172 are respectively connected across the two ends of the second capacitor C2. In this way, the opening direction of the first radiator 171 can be set to be opposite to the opening direction of the second radiator 172. Correspondingly, the feed point of the third radiator 173 is connected to the first end of the second parallel capacitor unit 162, and the feed point of the fourth radiator 174 is connected to the second end of the second parallel capacitor unit 162. For example, the third radiator 173 and the fourth radiator 174 are respectively connected across the two ends of the fourth capacitor C4. In this way, the opening direction of the third radiator 173 can be set to be opposite to the opening direction of the fourth radiator 174.

[0095] In the embodiments of this application, by connecting the first radiator and the second radiator across the two ends of the first parallel capacitor unit, and connecting the third radiator and the fourth radiator across the two ends of the second parallel capacitor unit, the requirement that the opening directions of each radiator reusing the same impedance matching circuit must be consistent can be avoided, thereby improving the design flexibility of each radiator.

[0096] In an exemplary embodiment, the number of first radiators 171 connected to the first end of the first parallel capacitor unit 142 can be one or at least two. If there are multiple first radiators 171, the opening directions of each first radiator 171 must be consistent relative to the parallel connection; that is, the opening directions of each first radiator 171 are the same.

[0097] In an exemplary embodiment, the number of second radiators 172 connected to the second end of the first parallel capacitor unit 142 can be one or at least two. If there are multiple second radiators 172, the opening directions of each second radiator 172 need to be consistent relative to the parallel connection; that is, the opening directions of each second radiator 172 are the same.

[0098] In the embodiments of the application, the oscillating current of the at least two radiators connected in parallel is inversely proportional to their equivalent inductive reactance / inductance values. For example, the larger the equivalent inductive reactance / inductance value, the smaller the oscillating current; the smaller the equivalent inductive reactance / inductance value, the larger the oscillating current. It should be understood that the equivalent inductive reactance / inductance value of the at least two radiators connected in parallel can be the total inductance after connecting the equivalent inductances of each radiator in parallel. The total equivalent inductive reactance / inductance value of the at least two radiators connected in parallel by the first impedance matching circuit is lower than the equivalent inductive reactance / inductance value of a single near-field communication antenna. The antenna device provided in this application embodiment can increase its oscillating current, thereby increasing the induced electromotive force of the peer device communicating with the antenna device in the near field. In this application embodiment, by setting at least two first radiators connected in parallel and / or at least two second radiators connected in parallel, it is equivalent to increasing the effective length and sensing area of ​​the antenna, and can also increase the oscillating current of each radiator, thereby increasing the induced electromotive force of the peer device communicating with the antenna device in the near field, and improving the near-field communication performance of the antenna device.

[0099] In one exemplary embodiment, the number of first radiators 171 and the number of second radiators 172 may be the same or different.

[0100] In an optional embodiment, the number of first radiators 170 connected to the first end of the first parallel capacitor unit 142 is different from the number of first radiators 170 connected to the second end of the first parallel capacitor unit 142.

[0101] For example, the antenna device includes a first radiator 171 and b second radiators 172; wherein a = b, or a < b, or a > b, and a + b = n. In the embodiments of this application, a and b are positive integers greater than or equal to 1.

[0102] In the embodiments of this application, the number of first radiators connected to the first matching impedance circuit can be the same as or different from the number of second radiators. This can further improve the design flexibility of the first and second radiators in electronic devices.

[0103] In an exemplary embodiment, the number of third radiators 173 connected to the first end of the second parallel capacitor unit 162 can be one or at least two. If there are multiple third radiators 173, the opening directions of each third radiator 173 need to be consistent, that is, the opening directions of each third radiator 173 are the same.

[0104] In an exemplary embodiment, the number of fourth radiators 174 connected to the second end of the second parallel capacitor unit 162 can be one or at least two. If there are multiple fourth radiators 174, each fourth radiator 174 is connected in parallel, and the opening direction of each fourth radiator 174 needs to be consistent and the opening direction of each fourth radiator 174 is the same.

[0105] In this embodiment, by setting at least two third radiators connected in parallel and / or at least two fourth radiators connected in parallel, the effective length and sensing area of ​​the antenna are increased, and the oscillation current of each radiator can also be increased, thereby increasing the induced electromotive force of the peer device that communicates with the antenna device in the near field, and improving the near field communication performance of the antenna device.

[0106] In one exemplary embodiment, the number of third radiators 173 may be the same as or different from the number of fourth radiators 174.

[0107] In an optional embodiment, the number of third radiators 173 connected to the first end of the second parallel capacitor unit 162 is different from the number of fourth radiators 174 connected to the second end of the second parallel capacitor unit 162.

[0108] For example, the antenna device includes c third radiators 173 and d fourth radiators 174; wherein c = d, or c < d, or c > d, and c + d = m. In the embodiments of this application, c and d are positive integers greater than or equal to 1.

[0109] In the embodiments of this application, the number of third radiators connected to the second matching impedance circuit can be the same as or different from the number of fourth radiators. This can further improve the design flexibility of the number of third and fourth radiators in electronic devices.

[0110] In one exemplary embodiment, this application also provides an antenna device that can simplify the wiring design of circuit board 110 to reduce PCB trace length. For example... Figure 7 and Figure 8 As shown, the antenna device may include at least two fifth radiators 175, at least two sixth radiators 176, a near-field communication chip 120, a first transmission line 230, a second transmission line 240, a third impedance matching circuit 210, a fourth impedance matching circuit 220, at least two fifth radiators 175, and at least two sixth radiators 176.

[0111] Unlike the previous embodiments, the third and fourth matching circuits in this embodiment each include at least two impedance matching branches, each of which is connected to the feed point of a radiator. That is, in the antenna device of this embodiment, a corresponding impedance matching branch is configured for each radiator to achieve impedance matching and tuning.

[0112] The antenna device also includes a first transmission line 230 and a second transmission line 240.

[0113] For example, the near-field communication chip 120, the first transmission line 230, the second transmission line 240, the third impedance matching circuit 210, and the fourth impedance matching circuit 220 in the antenna device are respectively disposed on the circuit board 110.

[0114] The first transmission line 230 is connected to the first transmitter TX1, and can transmit the first feed signal provided by the first transmitter TX1 to each impedance matching branch in the third impedance matching circuit 210. The third impedance matching circuit 210 includes at least two first impedance matching branches 211. The first end of each first impedance matching branch 211 is connected to the first transmission line 230, and the second end of each first impedance matching branch 211 is connected to a common ground. The third end of each first impedance matching branch 211 is connected to the feed point of a fifth radiator 175. Each first impedance matching branch 211 can be connected to a fifth radiator 175, and the fifth radiators 175 connected to each first impedance matching branch 211 are not the same. That is, each fifth radiator 175 is configured with a first impedance matching branch 211 to achieve impedance matching and resonant frequency adjustment.

[0115] The second transmission line 240 is connected to the second transmitter TX2, and can transmit the second feed signal provided by the second transmitter TX2 to each impedance matching branch in the fourth impedance matching circuit 220. The fourth impedance matching circuit 220 includes at least two second impedance matching branches 221. The first end of each second impedance matching branch 221 is connected to the second transmission line 240, and the second end of each second impedance matching branch 221 is connected to a common ground terminal. The third end of each second impedance matching branch 221 is connected to the feed point of a sixth radiator 176. Each second impedance matching branch 221 can be connected to a sixth radiator 1760, and the sixth radiators 176 connected to each second impedance matching branch 221 are not the same. That is, each sixth radiator 176 is configured with a second impedance matching branch 221 to achieve impedance matching and resonant frequency adjustment.

[0116] In this embodiment, the antenna device includes at least two fifth radiators, at least two sixth radiators, a circuit board, a near-field communication chip disposed on the circuit board, a first transmission line, a second transmission line, a third impedance matching circuit, and a fourth impedance matching circuit. Each first impedance matching branch can reuse the same first transmission line to connect to the first transmitter to transmit a first feed signal, and each second impedance matching branch can reuse the same second transmission line to connect to the second transmitter to transmit a second feed signal. Each impedance matching branch is connected to the corresponding transmitter through a transmission line, which simplifies the wiring design of the circuit board and reduces the trace length of the circuit board.

[0117] Furthermore, each radiator is configured with an impedance matching branch to achieve impedance matching and resonant frequency adjustment. This allows the impedance and resonant frequency of each radiator to be matched, ensuring that the performance of each first radiator in radiating NFC signals is optimized, thereby improving the performance of the antenna device in radiating NFC signals. Each impedance matching circuit is connected in parallel with at least two radiators. The number of radiators connected to each impedance matching circuit is at least one more than in related technologies. The total equivalent inductance / inductance value of the at least two radiators connected in parallel with the same impedance matching circuit is lower than the equivalent inductance / inductance value of a single radiator. Therefore, the antenna device provided in this application embodiment can increase its oscillation current, thereby increasing the induced electromotive force of the peer device communicating with the antenna device in the near field.

[0118] In practical applications, the near-field communication chip, the fifth radiator 175 and the sixth radiator 176 in the embodiments of this application can refer to the near-field communication chip and radiator in the foregoing embodiments, and will not be repeated here.

[0119] In one exemplary embodiment, the first transmission line 230 and the second transmission line 240 may be, but are not limited to, aluminum foil conductors, microstrip lines, striplines, etc. In this application embodiment, the specific types of the first transmission line 230 and the second transmission line 240 are not limited, nor are they limited to the examples described above.

[0120] In an exemplary embodiment, the distance between the first connection point and the feed point of a first radiator 170 is less than the length of the first transmission line 230. The first connection point is the connection node between the first transmission line 230 and each of the first impedance matching branches 211. For example, if the antenna device includes four fifth radiators 175, the distance between the first connection point and the feed point of one of the four fifth radiators 175 is less than the length of the first transmission line 230. Thus, the first connection point of the first transmission line 230 can be positioned close to any of the first radiators 170.

[0121] In an exemplary embodiment, the distance between the second connection point and the feed point of a sixth radiator 176 is less than the length of the second transmission line 240. The second connection point is the connection node between the second transmission line 240 and each of the second impedance matching branches 221. For example, if the antenna device includes four sixth radiators 176, the distance between the second connection point and the feed point of one of the four sixth radiators 176 is less than the length of the second transmission line 240. Thus, the second connection point of the second transmission line 240 can be positioned close to any of the second radiators 180.

[0122] In this embodiment, the first connection point of the first transmission line is located near any fifth radiator, and the second connection point of the second transmission line is located near any sixth radiator. This can reduce the trace length between the corresponding transmission line and the corresponding radiator, and further reduce the trace length of the circuit board.

[0123] like Figure 9 As shown, in an exemplary embodiment, both the first impedance matching branch 211 and the second impedance matching branch 221 include a series capacitor C5 and a parallel capacitor C6. The number of series capacitors C5 and parallel capacitors C6 can be one or more. For example, the first impedance matching branch 211 and the second impedance matching branch 221 may include at least two series capacitors C5 connected in parallel and at least two parallel capacitors C6 connected in parallel.

[0124] The first terminal of the serial capacitor C5 is the first terminal of the corresponding impedance matching branch. The second terminal of the serial capacitor C5 is connected to the first terminal of the parallel capacitor C6. The second terminal of the parallel capacitor C6 is connected to the common ground terminal. The parallel capacitor C6 is also the first terminal of the corresponding impedance matching branch.

[0125] The serial capacitor C5 is used to adjust the impedance between each fifth radiator 175 and the near-field communication chip to achieve impedance matching. Its serial capacitor C5 and parallel capacitor C6 can form a resonant circuit (or oscillation circuit) with the equivalent inductance of the corresponding connected radiator. By adjusting the capacitance values ​​of the serial capacitor C5 and parallel capacitor C6 in the impedance matching circuit, the resonant frequency can be adjusted, thereby obtaining maximum power transmission. For example, when the serial capacitor C5 and parallel capacitor C6 are in perfect resonance with the corresponding connected radiator, the total impedance of the path containing the radiator is purely resistive. The total capacitive reactance of the serial capacitor C5 and parallel capacitor C6 cancels out the influence of the inductive reactance of the radiator on NFC performance. Therefore, the current transmitted on the radiator is maximum, the magnetic flux is also maximum, and the radiator's performance in radiating NFC signals is optimal.

[0126] In practical applications, the capacitance values ​​and quantities of the serial capacitor C5 and the parallel capacitor C6 can be set according to the requirements of the corresponding connected radiators. The capacitance values ​​of the serial capacitors C5 and the parallel capacitors C6 can be the same or different. In this embodiment, the capacitance values ​​of the serial capacitors C5 and the parallel capacitors C6 in the corresponding impedance matching branch can be set according to the length and type of each first radiator 170 and second radiator 180. By reasonably setting the capacitance values ​​of each capacitor, resonance is achieved, and impedance matching between the near-field communication chip and each first radiator 170 and each second radiator 180 is achieved, so that the performance of the first radiator 170 and the second radiator 180 in radiating NFC signals can reach its optimal level, thus improving the performance of the antenna device in radiating NFC signals.

[0127] like Figure 10-12 As shown, based on any of the foregoing embodiments, the antenna device further includes a first filter circuit 191 and a second filter circuit 192; wherein, both the first filter circuit 191 and the second filter circuit 192 can filter out interference signals other than near-field communication signals.

[0128] The first end of the first filter circuit 191 is connected to the first transmitter TX1, and the second end of the first filter circuit 191 is connected to the first end of the first impedance matching circuit 140, for filtering out interference signals other than near-field communication signals.

[0129] The first end of the second filter circuit 192 is connected to the second transmitter TX2, and the second end of the second filter circuit 192 is connected to the first end of the second impedance matching circuit 160, for filtering out interference signals other than near-field communication signals.

[0130] In practical applications, Figure 10-12 In the antenna device shown, the first balun circuit 130 and the second balun circuit 150 can also be omitted.

[0131] Please continue to refer to this. Figure 10 In one exemplary embodiment, the passband frequencies of the first filter circuit 191 and the second filter circuit 192 are different. For example, one of the first filter circuit 191 and the second filter circuit 192 has a passband frequency of 13.56 MHz, which enables low-pass filtering; the other of the first filter circuit 191 and the second filter circuit 192 has a passband frequency of 16 MHz, which enables high-pass filtering. It should be understood that high-pass filtering should be understood in contrast to low-pass filtering.

[0132] For example, the first filter circuit 191 includes a first filter capacitor C7 and a first inductor L1. The first terminal of the first inductor L1 is connected to the first transmitter TX1, and the second terminal of the first inductor L1 is connected to the first terminal of the first filter capacitor C7 and the first impedance matching circuit 140. The second terminal of the first filter capacitor C7 is connected to a common ground. The second filter circuit 192 includes a second filter capacitor C8 and a second inductor L2. The first terminal of the second filter capacitor C8 is connected to the second transmitter TX2, and the second terminal of the second filter capacitor C8 is connected to the first terminal of the second inductor L2 and the second impedance matching circuit 160. The second terminal of the second inductor L2 is connected to a common ground.

[0133] In this embodiment, the first filter capacitor and the first inductor can form a low-pass filter, and the second filter capacitor and the second inductor can form a high-pass filter. By setting the capacitance value of each filter capacitor and the inductance value of each inductor in each filter circuit, different cutoff frequencies can be set to achieve a high-pass and low-pass dual-frequency filter, such as 13.56MHz and 16MHz, to support dual-band near-field communication, which can extend the frequency band of near-field communication and improve the radiation performance of the antenna device.

[0134] In one exemplary embodiment, the first filter circuit 191 and the second filter circuit 192 have the same passband frequency. Exemplarily, their passband frequency may be 13.56MHz or 16MHz.

[0135] For example, both the first filter circuit 191 and the second filter circuit 192 may include an LC resonant circuit. The LC resonant circuit may include a filter capacitor and an inductor. When the resonant frequency of the resonant circuit is the same as or close to the frequency of the near-field communication signal, it can shield interference signals other than the near-field communication signal.

[0136] like Figure 11 and Figure 12 As shown, exemplarily, the first filter circuit 191 includes a third inductor L3 and a third filter capacitor C9. The first terminal of the third inductor L3 is connected to the first transmitter TX1, the second terminal of the third inductor L3L2 is connected to the first terminal of the third filter capacitor C9 and the first terminal of the first impedance matching circuit 140, respectively, and the second terminal of the third filter capacitor C9 is connected to a common ground terminal.

[0137] For example, the second filter circuit 192 includes a fourth inductor L4 and a fourth filter capacitor C10, wherein the first end of the fourth inductor L4 is connected to the second transmitter TX2, the second end of the fourth inductor L4 is connected to the first end of the fourth filter capacitor C10 and the first end of the second impedance matching circuit 160, and the second end of the fourth filter capacitor C10 is connected to the common ground.

[0138] In this application, the values ​​of the filter capacitors and inductors in the first and second filter circuits can be adjusted to regulate their cutoff frequencies, thereby minimizing link loss. In practical applications, the specific circuit configurations of the first and second filter circuits are not specifically limited, and are limited to the examples described above; they only need to filter out interference signals other than near-field communication signals.

[0139] Please continue to refer to this. Figure 10-12 In one exemplary embodiment, the near-field communication chip 120 includes a first receiver RX1 and a second receiver RX2, and the antenna device may further include a first receiving circuit 193 and a second receiving circuit 194.

[0140] The first receiving circuit 193 is connected to the first receiving terminal RX1 and the first impedance matching circuit 140 respectively, and is used to filter out interference signals other than near-field communication signals received by the first radiator 170.

[0141] The second receiving circuit 194 is connected to the second receiving terminal RX2 and the second impedance matching circuit 160 respectively, and is used to filter out interference signals other than near-field communication signals received by the second radiator 180.

[0142] The first receiving circuit 193 and the second receiving circuit 194 each include a series filter branch. The first end of the series filter branch of the first receiving circuit 193 is connected to the first receiving terminal RX1, and the second end of the series filter branch is connected to the first end of the first impedance matching circuit 140. The first end of the series filter branch of the second receiving circuit 194 is connected to the second receiving terminal RX2, and the second end of the series filter branch is connected to the first end of the second impedance matching circuit 160. For example, the first receiving circuit 193 may include a resistor Rrx1 and a filter capacitor Crx1 connected in series. The second receiving circuit 194 may include a resistor Rrx2 and a filter capacitor Crx2 connected in series.

[0143] In practical applications, the specific circuit configurations of the first receiving circuit 193 and the second receiving circuit 194 are not specifically limited, and are limited to the examples described above. They can filter out interference signals other than near-field communication signals.

[0144] In this embodiment, each receiver of the near-field communication chip is connected to a receiving circuit, which can filter out interference signals other than near-field communication signals received by the radiators, thereby effectively improving the antenna device's reception performance for near-field wireless signals.

[0145] like Figure 13-16As shown, for ease of explanation, each radiator in the antenna device is a portion of the conductive frame. For further explanation, an example is given where the antenna device includes eight radiators, specifically two first radiators 171, two third radiators 173, and two fourth radiators 174. For instance, the antenna device includes radiators E, F, G, H, I, J, K, and L. Radiators E and F are both portions of the third frame; radiator G is a bent radiator, part of which is part of the third frame, and the remainder is part of the first frame; radiators H and I are each portions of the first frame; radiator J is a bent radiator, part of which is part of the first frame, and the remainder is part of the fourth frame; radiators K and L are both portions of the fourth frame.

[0146] Among them, radiators E, H, J, and L have the same opening direction. Radiators F, G, I, and K have the same opening direction. Radiators E and F have opposite opening directions.

[0147] Please continue to refer to this. Figure 13 In one exemplary embodiment, the first serial capacitor unit 141 and the second serial capacitor unit 161 are arranged along a first direction, which is the same as the extension direction of the first frame.

[0148] For example, one of the first serial capacitor unit 141 and the second serial capacitor unit 161 may be located near the third frame, and the other of the first serial capacitor unit 141 and the second serial capacitor unit 161 may be located near the fourth frame.

[0149] Please continue to refer to this. Figure 14 In an optional embodiment, the first balun circuit 130 and the second balun circuit 150 are arranged along a first direction, which is the same as the extension direction of the first frame.

[0150] In an optional embodiment, the first serial capacitor unit 141, the first balun circuit 130, the second serial capacitor unit 161, and the second balun circuit 150 are arranged along a first direction, which is the same as the extension direction of the first frame.

[0151] For ease of explanation, we will take as an example an eight-radiator configuration where radiators E and F are both first radiators 171, radiators G and H are both second radiators 172, radiators I and J are both third radiators 173, and radiators K and L are both fourth radiators 174. The first serial capacitor unit 141 is positioned close to the third frame, and the second serial capacitor unit 161 can be positioned close to the fourth frame.

[0152] In an optional embodiment, the first serial capacitor unit 141 and the first balun circuit 130 are disposed near the third frame, and the second serial capacitor unit 161 and the second balun circuit 150 are disposed near the fourth frame.

[0153] In this circuit, the first terminal of the first parallel capacitor unit 142 of the first impedance matching circuit is connected to the feed points of radiators E and H, respectively, and the second terminal of the first parallel capacitor unit 142 of the first impedance matching circuit 140 is connected to the feed points of radiators F and G, respectively. The first terminal of the second parallel capacitor unit 162 of the second impedance matching circuit 160 is connected to the feed points of radiators J and L, respectively, and the second terminal of the second parallel capacitor unit 162 of the second impedance matching circuit 160 is connected to the feed points of radiators I and K, respectively.

[0154] In an optional embodiment, among the eight radiators, radiators E and F are both third radiators 173, radiators G and H are both fourth radiators 174, radiators I and J are both first radiators 171, and radiators K and L are both second radiators 172. The second balun circuit 150 is disposed near the third frame, and the first balun circuit 130 may be disposed near the fourth frame.

[0155] In this embodiment, the first serial capacitor unit and the second serial capacitor unit in the antenna device can be arranged along the first direction. Since the opening directions of the first radiator and the second radiator do not need to be consistent, and the opening directions of the third radiator and the fourth radiator do not need to be consistent, four radiators closer to the first serial capacitor unit can be selected as the first radiator and the second radiator, respectively, and four radiators closer to the second serial capacitor unit can be selected as the third radiator and the fourth radiator. In this way, the layout flexibility of each radiator in the electronic device can be improved. It can reuse radiators used to support cellular signals, Bluetooth signals, and WiFi signals, which can increase the utilization rate of radiators and simplify the wiring design of the circuit board, further reducing the trace length of the circuit board.

[0156] Please continue to refer to this. Figure 15 and Figure 16 In one exemplary embodiment, the first serial capacitor unit 141 and the second serial capacitor unit 161 are arranged along a second direction, which is the same as the extending direction of the third frame. For example, one of the first serial capacitor unit 141 and the second serial capacitor unit 161 may be disposed close to the first frame, and the other of the first serial capacitor unit 141 and the second serial capacitor unit 161 may be disposed away from the first frame.

[0157] Please continue to refer to this. Figure 16 In an optional embodiment, the first balun circuit 130 and the second balun circuit 150 are arranged along the second direction.

[0158] In an optional embodiment, the first serial capacitor unit 141, the first balun circuit 130, the second serial capacitor unit 161, and the second balun circuit 150 are arranged along a second direction.

[0159] For ease of explanation, the following example is used: among eight radiators, radiators H and J are both first radiators 171; radiators G and I are both second radiators 172; radiators F and K are both third radiators 173; and radiators E and L are both fourth radiators 174. The first serial capacitor unit 141 is positioned close to the first frame, and the second serial capacitor unit 161 is positioned away from the first frame relative to the first serial capacitor unit 141.

[0160] In this circuit, the first terminal of the first serial capacitor unit 141 of the first impedance matching circuit 140 is connected to the feed points of radiators H and J, respectively, and the second terminal of the first serial capacitor unit 141 of the first impedance matching circuit 140 is connected to the feed points of radiators G and I, respectively. Similarly, the first terminal of the second serial capacitor unit 161 of the second impedance matching circuit 160 is connected to the feed points of radiators E and L, respectively, and the second terminal of the second serial capacitor unit 161 of the second impedance matching circuit 160 is connected to the feed points of radiators F and K, respectively.

[0161] In an optional embodiment, among the eight radiators, radiators H and J are both third radiators 173; radiators G and I are both fourth radiators 174; radiators F and K are both first radiators 171; and radiators E and L are both second radiators 172. The second serial capacitor unit 161 is disposed close to the first frame, and the first serial capacitor unit 141 is disposed away from the first frame relative to the second serial capacitor unit 161.

[0162] In this embodiment, the first and second serial capacitor units in the antenna device can be arranged along a second direction. Since the opening directions of the first and second radiators do not need to be consistent, and the opening directions of the third and fourth radiators do not need to be consistent, the four radiators closest to the first serial capacitor unit can be selected as the first and second radiators, and the four radiators closest to the first serial capacitor unit can be selected as the third and fourth radiators. This improves the layout flexibility of each radiator in the electronic device, allowing for the reuse of radiators supporting cellular signals, Bluetooth signals, and WiFi signals, thus increasing the utilization rate of the radiators. It also simplifies the wiring design of the circuit board, further reducing the trace length. In this embodiment, the layout of the first and second serial capacitor units along the second direction can also be applied to foldable electronic devices. The foldable device may include a first housing, a second housing, and a pivot mechanism, with the first and second housings rotatably connected via the pivot mechanism. In this way, the first serial capacitor unit and the second serial capacitor unit can be arranged in the same housing of the foldable electronic device. During the folding process of the foldable electronic device, the connection between the first serial capacitor unit and the second serial capacitor unit and the near-field communication chip is not affected, which can further improve the service life and radiation performance of the antenna device.

[0163] like Figure 17 As shown, further explanation will be given using a mobile phone as an example of the aforementioned antenna device. Specifically, as follows... Figure 17 As shown, the mobile phone may include a memory 31 (which optionally includes one or more computer-readable storage media), processing circuitry 32, a peripheral device interface 33, an antenna arrangement as described in the above embodiments, and an input / output (I / O) subsystem 36. These components optionally communicate via one or more communication buses or signal lines 39. Those skilled in the art will understand that... Figure 17 The mobile phone shown does not constitute a limitation on the mobile phone and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Figure 17 The various components shown are implemented in hardware, software, or a combination of both, including one or more signal processing and / or application-specific integrated circuits.

[0164] Memory 31 optionally includes high-speed random access memory, and also optionally includes non-volatile memory, such as one or more disk storage devices, flash memory devices, or other non-volatile solid-state memory devices. Exemplary examples include software components stored in memory 31 such as an operating system 311, a communication module (or instruction set) 312, a global positioning system (GPS) module (or instruction set) 313, etc.

[0165] The processing circuit 32 and other control circuits can be used to control the operation of the mobile phone. The processing circuit 32 can be based on one or more microprocessors, microcontrollers, digital signal processors, baseband processors, power management units, audio codec chips 120, application-specific integrated circuits, etc. The processing circuit 32 can be configured to implement control algorithms for controlling the use of the antenna device in the mobile phone. The processing circuit 32 can also issue control commands for controlling various switches in the antenna device.

[0166] I / O subsystem 36 couples input / output peripherals on the mobile phone, such as the keypad and other input control devices, to peripheral interface 33. I / O subsystem 36 optionally includes a touchscreen, buttons, a tone generator, an accelerometer (motion sensor), an ambient light sensor and other sensors, light-emitting diodes and other status indicators, data ports, etc. For example, a user can control the operation of the mobile phone by supplying commands via I / O subsystem 36, and can use the output resources of I / O subsystem 36 to receive status information and other outputs from the mobile phone. For example, a user can press button 361 to turn the mobile phone on or off.

[0167] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The above embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this patent application. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An antenna device, characterized in that, include: A near-field communication chip includes a first transmitter and a second transmitter, wherein the first transmitter is used to provide a first power supply signal and the second transmitter is used to provide a second power supply signal; The first impedance matching circuit includes a first serial capacitor unit and a first parallel capacitor unit. The first end of the first serial capacitor unit is connected to the first transmitter, and the second end of the first serial capacitor unit is connected to the first end of the first parallel capacitor unit. The second impedance matching circuit includes a second serial capacitor unit and a second parallel capacitor unit. The first end of the second serial capacitor unit is connected to the second transmitter, and the second end of the second serial capacitor unit is connected to the first end of the second parallel capacitor unit. The first radiator has its feed point connected to the first terminal of the first parallel capacitor unit, and its ground point is connected to the common ground terminal. The second radiator has its feed point connected to the second end of the first parallel capacitor unit, and its ground point is connected to the common ground. The third radiator has its feed point connected to the first end of the second parallel capacitor unit, and the grounding point of each third radiator is connected to the common ground. The fourth radiator has its feed point connected to the first end of the second parallel capacitor unit, and the grounding point of each fourth radiator is connected to a common ground.

2. The antenna device according to claim 1, characterized in that, The antenna device further includes: A first balun circuit, wherein a first end of the input coil of the first balun circuit is connected to the first transmitting end, and a second end of the input coil of the first balun circuit is connected to the common ground; a first end of the output coil of the first balun circuit is connected to the first end of the first parallel capacitor unit, and a second end of the output coil of the first balun circuit is connected to the second end of the first parallel capacitor unit; and a first serial capacitor unit is connected in series between the output coil of the first balun circuit and the first parallel capacitor unit. The second balun circuit has a first end of its input coil connected to the second transmitter, and a second end of its input coil connected to the common ground. The first end of the output coil of the second balun circuit is connected to the first end of the second parallel capacitor unit, and the second end of its output coil is connected to the second end of the second parallel capacitor unit. The second serial capacitor unit is connected in series between the output coil of the second balun circuit and the second parallel capacitor unit.

3. The antenna device according to claim 1 or 2, characterized in that, The opening direction of the first radiator is opposite to the opening direction of the second radiator; The opening direction of the third radiator is opposite to that of the fourth radiator.

4. The antenna device according to claim 3, characterized in that, The antenna device includes at least two first radiators, each of which has the same opening direction; and / or The antenna device includes at least two second radiators, and the openings of each second radiator are in the same direction.

5. The antenna device according to claim 3, characterized in that, The antenna device includes at least two third radiators, all of which have the same opening direction; and / or, The antenna device includes at least two fourth radiators, and the openings of the fourth radiators are in the same direction.

6. The antenna device according to claim 1, characterized in that, The number of the first radiators is the same as the number of the second radiators, or... The number of the first radiators is different from the number of the second radiators, or... The number of the third radiators is the same as the number of the fourth radiators, or... The number of the third radiator is different from the number of the fourth radiator.

7. The antenna device according to claim 1, characterized in that, The antenna device further includes: A first filtering circuit, wherein a first end of the first filtering circuit is connected to the first transmitting end and a second end of the first filtering circuit is connected to the first end of the first impedance matching circuit, is used to filter out interference signals other than near-field communication signals. The second filter circuit has a first end connected to the second transmitter and a second end connected to the first end of the second impedance matching circuit, and is used to filter out interference signals other than near-field communication signals.

8. The antenna device according to claim 7, characterized in that, The first filter circuit and the second filter circuit have the same passband frequency, or the first filter circuit and the second filter circuit have different passband frequencies.

9. The antenna device according to claim 1, characterized in that, The near-field communication chip includes a first receiver and a second receiver, wherein the antenna device further includes: The first receiving circuit is connected to the first receiving end and the first impedance matching circuit respectively, and is used to filter out interference signals other than near-field communication signals received by the first radiator. The second receiving circuit is connected to the second receiving terminal and the second impedance matching circuit, respectively, and is used to filter out interference signals other than near-field communication signals received by the second radiator.

10. An antenna device, characterized in that, include: A near-field communication chip includes a first transmitter and a second transmitter, wherein the first transmitter is used to provide a first power supply signal and the second transmitter is used to provide a second power supply signal; A first transmission line is connected to the first transmitting end; The third impedance matching circuit includes at least two first impedance matching branches, the first end of each first impedance matching branch is connected to the first transmission line, and the second end of each first impedance matching branch is connected to the common ground. The second transmission line is connected to the second transmitter. The fourth impedance matching circuit includes at least two second impedance matching branches, the first end of each second impedance matching branch is connected to the second transmission line, and the second end of each second impedance matching branch is connected to the common ground. At least two fifth radiators, the feed point of each fifth radiator is respectively connected to the third end of a first impedance matching branch, and the ground point of each fifth radiator is connected to a common ground. At least two sixth radiators, each of which has a feed point connected to the third terminal of a second impedance matching branch, and a ground point connected to a common ground terminal.

11. The antenna device according to claim 10, characterized in that, Both the first impedance matching branch and the second impedance matching branch include a series capacitor and a parallel capacitor, wherein, The first terminal of the serial capacitor is the first terminal of the corresponding impedance matching branch, the second terminal of the serial capacitor is connected to the first terminal of the parallel capacitor, the second terminal of the parallel capacitor is connected to the common ground terminal, and the parallel capacitor is also the first terminal of the corresponding impedance matching branch.

12. An electronic device, characterized in that, include: Circuit board; as well as The antenna device according to any one of claims 1-9, wherein the near-field communication chip, the first impedance matching circuit and the second impedance matching circuit are respectively disposed on the circuit board; or, the antenna device according to claim 10 or 11, wherein the near-field communication chip, the first transmission line, the third impedance matching circuit, the second transmission line and the fourth impedance matching circuit are respectively disposed on the circuit board.

13. The electronic device according to claim 12, characterized in that, The electronic device includes a conductive frame, which includes a first frame and a second frame disposed opposite to each other, and a third frame and a fourth frame disposed opposite to each other, wherein the first frame, the third frame, the second frame and the fourth frame are connected in sequence, and the length of the third frame is greater than the length of the first frame. The first radiator, the second radiator, the third radiator, and the fourth radiator are all parts of the conductive frame.

14. The electronic device according to claim 13, characterized in that, When the antenna device includes a first impedance matching circuit and a second impedance matching circuit; wherein the first serial capacitor unit and the second serial capacitor unit are arranged along a first direction, and the first direction is the same as the extension direction of the first frame; or, The first serial capacitor unit and the second serial capacitor unit are arranged along a second direction, which is the same as the extension direction of the third frame.

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