Single-aperture feed circuit, near field communication system and electronic equipment

Abstract

The utility model discloses a single-aperture feed circuit, a near field communication system and electronic equipment, and relates to the technical field of communication, and the single-aperture feed circuit comprises a first feed unit and a second feed unit; the first end of the first feed unit is connected with the NFC chip through the CDMP interface, the second end of the first feed unit is connected with the first end of the second feed unit, and the second end of the first feed unit is further connected with a single-port feed point of a target antenna through an antenna elastic piece; and the first feed unit and the second feed unit are used for enabling the NFC chip to obtain the change of the target antenna in real time through the CDMP interface, and dynamically adjusting the impedance in the NFC chip. Compared with the prior art, signal reflection and loss can be reduced, and user experience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, in particular to a single-aperture feed circuit, a near field communication system and an electronic device. BACKGROUND

[0002] Near field communication (NFC) is a short-range wireless communication technology that allows electronic devices to exchange data within a few centimeters. A near field communication system used in electronic devices mainly includes an NFC chip, a feed circuit and a loop antenna, etc.

[0003] At present, a near field communication system containing a feed circuit in the related technology specifically adjusts the internal impedance of the NFC chip through the feed circuit, and then transmits signals and matches impedance between the NFC chip and the antenna, so as to ensure good impedance matching between the NFC chip and the antenna.

[0004] However, in the process of impedance matching, since the feed circuit can only adjust impedance according to the specifications of the set capacitance, it cannot adaptively adjust multiple impedance values, which may cause the internal impedance of the adjusted NFC chip to be unmatched with the impedance of the antenna, affecting user experience. SUMMARY

[0005] Therefore, the present application provides a single-aperture feed circuit, a near field communication system and an electronic device.

[0006] In a first aspect, the present application provides a single-aperture feed circuit connected between an NFC chip and a target antenna, comprising: a first feed unit and a second feed unit;

[0007] A first end of the first feed unit is connected to the NFC chip through a chip direct bonding micro-needle pin CDMP interface, a second end of the first feed unit is connected to a first end of the second feed unit, and the second end of the first feed unit is also connected to a single-port feed point of the target antenna;

[0008] The first feed unit and the second feed unit are configured to enable the NFC chip to acquire changes of the target antenna in real time through the CDMP interface, and dynamically adjust the internal impedance of the NFC chip.

[0009] Optionally, the first feed unit and the second feed unit are further configured to, when the NFC chip is in a receiving state, dynamically adjust the internal impedance of the NFC chip, so that the first feed unit is connected to ground in the NFC chip; or

[0010] The first feeding unit and the second feeding unit are also used for dynamically adjusting the impedance inside the NFC chip when the NFC chip is in a transmitting state, so that the NFC chip is in a high configuration state; or,

[0011] The first feeding unit and the second feeding unit are also used for powering the electronic device where the NFC chip is located by inducting the signal transceiving frequency of an external NFC detection device through an NFC coil when the electronic device where the NFC chip is located is in a power-off state, and completing communication by dynamically adjusting the impedance inside the NFC chip.

[0012] Optionally, the first feeding unit comprises a first capacitor, a second capacitor and a first inductor;

[0013] A first end of the first inductor is connected with the NFC chip through the CDMP interface, and a second end of the first inductor is connected with a first end of the first capacitor and a first end of the second capacitor;

[0014] A second end of the first capacitor is connected with a second end of the second capacitor and a first end of the second feeding unit, and the second end of the first capacitor is also connected with a single-port feeding point of the target antenna through an antenna spring.

[0015] Optionally, the first inductor, the first capacitor and the second capacitor are used for jointly forming a signal transmission path between the NFC chip and the target antenna based on the CDMP interface and the second feeding unit, and dynamically adjusting the impedance inside the NFC chip;

[0016] The first capacitor and the second capacitor are also used for filtering electromagnetic interference.

[0017] Optionally, the second feeding unit comprises a second inductor and a third capacitor;

[0018] A first end of the second inductor is connected with the NFC chip, and a second end of the second inductor is connected with a first end of the third capacitor;

[0019] A second end of the third capacitor is connected with a second end of the first capacitor and a second end of the second capacitor.

[0020] Optionally, the second inductor and the third capacitor are used for inducting field intensity, and determining that the target antenna is in a transmitting state or a receiving state.

[0021] Optionally, the second feeding unit further comprises a fourth capacitor and a fifth capacitor;

[0022] The first end of the fourth capacitor is connected with the first end of the fifth capacitor and the target antenna, and the second end of the fourth capacitor is connected with the second end of the fifth capacitor, the second end of the first capacitor, the second end of the second capacitor, and the second end of the third capacitor.

[0023] Optionally, the fourth capacitor and the fifth capacitor are used to form a signal transmission path between the NFC chip and the target antenna together with the CDMP interface, the first feeding unit, the second inductor, and the third capacitor, and dynamically adjust the impedance inside the NFC chip.

[0024] Optionally, the second feeding unit further comprises a sixth capacitor and a seventh capacitor.

[0025] The first end of the sixth capacitor is connected with the first end of the seventh capacitor, the second end of the first capacitor, the second end of the second capacitor, the second end of the third capacitor, the second end of the fourth capacitor, and the second end of the fifth capacitor.

[0026] The second end of the sixth capacitor is connected with the second end of the seventh capacitor, and the second end of the sixth capacitor and the second end of the seventh capacitor are grounded.

[0027] Optionally, the sixth capacitor and the seventh capacitor are used to form a signal transmission path between the NFC chip and the target antenna together with the CDMP interface, the first feeding unit, the second inductor, the third capacitor, the fourth capacitor, and the fifth capacitor, and dynamically adjust the impedance inside the NFC chip.

[0028] In a second aspect, the present application provides a near field communication system, comprising: a near field communication NFC chip, a target antenna, and a single-aperture feeding circuit as described in the first aspect.

[0029] The first end of the single-aperture feeding circuit is connected with the NFC chip through a CDMP interface, the second end of the single-aperture feeding circuit is connected with the NFC chip, the third end of the single-aperture feeding circuit is connected with the target antenna, the fourth end of the single-aperture feeding circuit is connected with a single-port feeding point of the target antenna through an antenna spring, and the fifth end of the single-aperture feeding circuit is grounded.

[0030] The single-aperture feeding circuit is used to be connected to a ground end inside the NFC chip through the CDMP interface, so that the NFC chip acquires the changes of the target antenna in real time through the CDMP interface and dynamically adjusts the impedance inside the NFC chip.

[0031] Optionally, the target antenna comprises a single-port feeding and a lower point.

[0032] The single-port feed point is located at the backplate side edge of the electronic device and is close to the lower edge of the stacked decoration part DECO of the electronic device;

[0033] The lower point is located obliquely above the single-port feed point in the backplate of the electronic device and is close to the lower edge midpoint of the top speaker.

[0034] Optionally, the effective wire length in the horizontal direction from the single-port feed point to the lower point in the target antenna is greater than or equal to a first predetermined length threshold;

[0035] The effective wire length in the vertical direction from the single-port feed point to the lower point in the target antenna is greater than or equal to a second predetermined length threshold, and the first predetermined length threshold is less than the second predetermined length threshold.

[0036] Optionally, the target antenna is provided with a predetermined width of ferrite on both sides in the flexible printed circuit board FPC wire area; and,

[0037] The target antenna is provided with a predetermined area of ferrite in the inner arc area of the corner of the target antenna.

[0038] In a third aspect, the present application provides an electronic device comprising the near field communication system of the second aspect.

[0039] Through the above technical solution, the single-aperture feed circuit, the near field communication system and the electronic device provided by the present application, compared with the related art, the first end of the first feed unit in the single-aperture feed circuit is connected with the NFC chip through the chip direct mounting micro-needle foot (CDMP) interface, so that the first feed unit can be connected to the internal ground end of the NFC chip through the CDMP interface. Since the internal ground end of the NFC chip is close to the target antenna, the first feed unit can be connected to the internal ground end of the NFC chip through the CDMP interface to obtain the target antenna in real time through the CDMP interface, and based on the different states of the target antenna, the first feed unit and the second feed unit work together to dynamically adjust the internal impedance of the NFC chip, so that the adjusted internal impedance of the NFC chip is more suitable for the impedance of the target antenna. By using the single-aperture feed circuit to connect with the single-port feed point contained in the target antenna, it is also easier to achieve good impedance matching between the antenna and the feed circuit, reduce signal reflection and loss, and thus improve user experience.

[0040] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0042] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This paper shows a schematic diagram of a single-aperture power supply circuit according to an embodiment of the present application.

[0044] Figure 2 A schematic diagram illustrating an example provided in an embodiment of this application is shown;

[0045] Figure 3 A schematic diagram illustrating an example provided in an embodiment of this application is shown;

[0046] Figure 4 A schematic diagram illustrating an example provided in an embodiment of this application is shown;

[0047] exist Figure 1 middle:

[0048] 1-First power supply unit, 2-Second power supply unit. Detailed Implementation

[0049] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0051] In this application, unless specifically defined otherwise, the terms "mounting", "connected", "connection", "fixed", and the like should be construed broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0052] In the following, the present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0053] The following will be described in conjunction with Figure 1 A single-port feeding circuit according to some embodiments of the present application is described.

[0054] The single-port feeding circuit provided by the present application, as shown in Figure 1 includes a first feeding unit 1 and a second feeding unit 2; the first end of the first feeding unit 1 is connected with an NFC chip through a chip direct mount pin (CDMP) interface, the second end of the first feeding unit 1 is connected with the first end of the second feeding unit 2, and the second end of the first feeding unit 1 is also connected with a single-port feeding point of a target antenna; the first feeding unit 1 and the second feeding unit 2 are used to form a signal transmission path between the NFC chip and the target antenna based on the CDMP interface, so that the NFC chip can obtain the changes of the target antenna in real time through the CDMP interface, and dynamically adjust the impedance inside the NFC chip.

[0055] In the embodiments of the present application, the single-port feeding circuit is a circuit design in an antenna system for transmitting signals from a signal source (such as a transmitter or receiver) to an antenna, and only contains one feeding point. This circuit is usually used in single-port antennas, i.e. antennas with only one feeding point. The design of the single-port feeding circuit needs to ensure efficient transmission of signals and good impedance matching.

[0056] In some examples, the Chip Down MicroPins (CDMP) interface is an interface design used in semiconductor packaging technology, aiming to improve signal integrity and thermal performance by reducing signal path length. The CDMP interface achieves high-performance and high-density interconnection by using MicroPins to mount the chip directly on the substrate. In the embodiments of the present application, the CDMP interface can be connected to the internal ground of the NFC chip, so that the ground position of the CDMP interface can be in the nearest matching position of the antenna end, thereby real-time acquisition of the antenna change condition can be realized, the state of the antenna can be determined through the antenna change condition, and then the internal impedance of the CDF chip can be adjusted based on the state of the antenna.

[0057] Further, the antenna state can include a sending state, a receiving state, an off state, and the like. The off state can be a shutdown state of an electronic device in which the antenna is located. Optionally, the electronic device can be a mobile phone, a tablet computer, and the like.

[0058] Specifically, the Single-Port Feeding Point of the antenna can be the only interface in the antenna system for connecting the feeding circuit and the antenna. In the single-port feeding design, the antenna is connected to the feeding circuit (such as a transmitter or receiver) through a unique feeding point. Correspondingly, the Ground Point of the antenna can be a position in the antenna system for connecting the Ground Plane. In antenna design, the Ground Plane is usually used to provide a reference potential, improve the radiation characteristics of the antenna, and reduce interference.

[0059] For the present embodiment, the Near Field Communication (NFC) chip is a special integrated circuit for implementing short-distance wireless communication functions. NFC technology allows two devices to exchange data within a distance of a few centimeters, commonly used in mobile payments, data transmission, identity recognition, and other near-field interaction applications. The NFC chip can be used for data transmission between two devices, such as sharing contact information, website addresses, or text content.

[0060] Correspondingly, the Antenna Spring Contact is a mechanical device used to ensure reliable connection between the antenna and the device body. It is commonly used in devices that require frequent plugging and unplugging or use in mobile environments to ensure stable electrical connection between the antenna and the device. The design purpose of the Antenna Spring Contact is to provide good contact force and durability during the process of connecting and disconnecting the antenna.

[0061] In some examples, adjusting the internal impedance of the NFC chip can ensure good impedance matching between the NFC antenna and the NFC chip, thereby optimizing signal transmission efficiency and communication quality. The NFC chip usually includes one or more internal impedance adjustment functions to adapt to different antenna designs and application requirements.

[0062] Compared with the related art, in the present application, the first end of the first feeding unit in the single-aperture feeding circuit is connected to the NFC chip through a chip direct mount pin (CDMP) interface, so that the first feeding unit can be connected to the internal ground end of the NFC chip through the CDMP interface. Since the internal ground end of the NFC chip is close to the target antenna, connecting the first feeding unit to the internal ground end of the NFC chip through the CDMP interface can obtain the changes of the target antenna in real time through the CDMP interface, and based on different states of the target antenna, the internal impedance of the NFC chip is dynamically adjusted through the cooperation of the first feeding unit and the second feeding unit, so that the adjusted internal impedance of the NFC chip is more adaptable to the impedance of the target antenna. By using the single-aperture feeding circuit to connect with the single-port feeding point contained in the target antenna, it is also easier to achieve good impedance matching between the antenna and the feeding circuit, reducing signal reflection and loss, thereby improving user experience.

[0063] Optionally, the first feeding unit 1 and the second feeding unit 2 are further configured to dynamically adjust the internal impedance of the NFC chip when the NFC chip is in a receiving state, so that the first feeding unit 1 is turned on to ground in the NFC chip; or, the first feeding unit 1 and the second feeding unit 2 are further configured to dynamically adjust the internal impedance of the NFC chip when the NFC chip is in a transmitting state, so that the NFC chip is in a high configuration state; or, the first feeding unit 1 and the second feeding unit 2 are further configured to, when the electronic device in which the NFC chip is located is in a power-off state, sense the signal transmission frequency of an external NFC detection device through the NFC coil, power the electronic device in which the NFC chip is located, and complete communication by dynamically adjusting the internal impedance of the NFC chip.

[0064] In the embodiments of the present application, the first feeding unit 1 is connected to the internal ground end of the NFC chip through the CDMP interface, so that the antenna end in the NFC chip is matched to the ground inside the chip through the CDMP interface, the capacitance of the entire NFC antenna changes, causing the current to change, which can quickly complete information verification and be accurate.

[0065] In some examples, the transmission state (TX state) of the NFC antenna can be the state of the antenna when it is transmitting data, especially during active data transmission. In NFC technology, the TX state of the antenna mainly involves how to generate and transmit a carrier signal and how to modulate the signal to transmit data, specifically including generating a carrier signal, modulating the signal, and transmitting the signal. By properly configuring the NFC chip and its antenna, the efficiency and reliability of data transmission can be ensured.

[0066] In the embodiments of the present application, when the target antenna is in the transmission state, the first feeding unit 1 and the second feeding unit 2 dynamically adjust the impedance inside the chip to directly connect the first feeding unit to the ground in the NFC chip, so that the target antenna emits more stable and efficient power.

[0067] Correspondingly, when the NFC antenna is in the receiving state (RX state), the antenna is mainly used to receive signals from the target device. In this state, the signals received by the antenna are demodulated and processed by the NFC chip to obtain the data transmitted by the target device.

[0068] In the embodiments of the present application, when the target antenna is in the receiving state, the first feeding unit 1 and the second feeding unit 2 can dynamically adjust the impedance inside the NFC chip to make the NFC chip in the open high group state, so that the NFC chip focuses on the sensitivity of reception and is in a more sensitive state.

[0069] Further, when the electronic device in which the NFC chip is located is in the shutdown state, the signal transmission frequency of the external NFC detection device is inducted by the NFC coil, and the device in which the shutdown NFC chip is powered on is powered on. By dynamically adjusting the impedance of the CDMP path in the NFC chip through the first feeding unit 1 and the second feeding unit 2, communication is realized.

[0070] Optionally, the first feeding unit 1 includes a first capacitor C1, a second capacitor C2, and a first inductor L1; a first end of the first inductor L1 is connected with the NFC chip through the CDMP interface, a second end of the first inductor L1 is connected with a first end of the first capacitor C1 and a first end of the second capacitor C2; a second end of the first capacitor C1 is connected with a second end of the second capacitor C2 and a first end of the second feeding unit 2, and the second end of the first capacitor C1 is also connected with a single-port feeding point of the target antenna through an antenna spring.

[0071] Optionally, the first inductor L1, the first capacitor C1, and the second capacitor C2 are used to jointly form a signal transmission path between the NFC chip and the target antenna based on the CDMP interface and the second feeding unit 2, and dynamically adjust the impedance inside the NFC chip; the first capacitor C1 and the second capacitor C2 are also used to filter electromagnetic interference.

[0072] In the embodiment of the present application, the first inductor L1 can be R2256, the first capacitor C1 can be C2214, and the second capacitor C2 can be C2204. It should be noted that the specific models of the first inductor L1, the first capacitor C1 and the second inductor L2 can be self-set according to requirements, which are not specifically limited in the embodiment of the present application.

[0073] Further, the internal impedance of the NFC chip can be adjusted through the first inductor L1, the first capacitor C1 and the second capacitor C2. Specifically, by connecting the first capacitor C1 and the second capacitor C2 in parallel, the adjustable impedance range corresponding to the first feeding unit 1 can be determined according to the first capacitor C1 and the second capacitor C2, and the internal impedance of the NFC chip can be adjusted according to the target antenna within the adjustable impedance range.

[0074] Optionally, the second feeding unit 2 includes a second inductor L2 and a third capacitor C3; a first end of the second inductor L2 is connected with the NFC chip, a second end of the second inductor L2 is connected with a first end of the third capacitor C3; a second end of the third capacitor C3 is connected with a second end of the first capacitor C1 and a second end of the second capacitor C2.

[0075] Optionally, the second inductor L2 and the third capacitor C3 are used for sensing field strength to determine that the target antenna is in a transmitting state or a receiving state.

[0076] In the embodiment of the present application, the second inductor L2 can be R2203, and the third capacitor C3 can be C2210. It should be noted that the specific models of the third capacitor C3 and the second inductor L2 can be self-set according to requirements, which are not specifically limited in the embodiment of the present application.

[0077] Optionally, the second feeding unit 2 further includes a fourth capacitor C4 and a fifth capacitor C5; a first end of the fourth capacitor C4 and a first end of the fifth capacitor C5 are connected with a single-port feeding point of the target antenna, a second end of the fourth capacitor C4 and a second end of the fifth capacitor C5 are connected with a second end of the first capacitor C1, a second end of the second capacitor C2 and a second end of the third capacitor C3.

[0078] Optionally, the fourth capacitor C4 and the fifth capacitor C5 are used for jointly forming a signal transmission path between the NFC chip and the target antenna with the first feeding unit 1, the second inductor L2 and the third capacitor C3 based on the CDMP interface, and dynamically adjusting the internal impedance of the NFC chip.

[0079] In the embodiment of the present application, the fourth capacitor C4 can be C2211, and the fifth capacitor C5 can be C2213. It should be noted that the specific models of the fourth capacitor C4 and the fifth capacitor C5 can be self-set according to requirements, which are not specifically limited in the embodiment of the present application.

[0080] Further, by connecting the fourth capacitor C4 and the fifth capacitor C5 in parallel, the adjustable impedance range can be determined according to the fourth capacitor C4 and the fifth capacitor C5, and the internal impedance of the NFC chip is adjusted according to the antenna condition in the adjustable impedance range.

[0081] Optionally, the second feeding unit 2 further includes a sixth capacitor C6 and a seventh capacitor C7; a first end of the sixth capacitor C6 is connected with a first end of the seventh capacitor C7, a second end of the first capacitor C1, a second end of the second capacitor C2, a second end of the third capacitor C3, a second end of the fourth capacitor C4, and a second end of the fifth capacitor C5; a second end of the sixth capacitor C6 is connected with a second end of the seventh capacitor C7, and the second end of the sixth capacitor C6 and the second end of the seventh capacitor C7 are grounded.

[0082] Optionally, the sixth capacitor C6 and the seventh capacitor C7 are used to form a signal transmission path between the NFC chip and the target antenna based on the CDMP interface together with the first feeding unit 1, the second inductor L2, the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5, and dynamically adjust the impedance inside the NFC chip.

[0083] In the embodiment of the present application, the sixth capacitor C6 can be C2239, and the seventh capacitor C7 can be C2209. It should be noted that the specific model of the sixth capacitor C6 and the seventh capacitor C7 can be self-set according to the demand, which is not limited in the embodiment of the present application.

[0084] Further, by connecting the sixth capacitor C6 and the seventh capacitor C7 in parallel, the adjustable impedance range can be determined according to the sixth capacitor C6 and the seventh capacitor C7, and the internal impedance of the NFC chip is adjusted according to the antenna condition in the adjustable impedance range in combination with the first feeding unit 1, the second inductor L2, the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5.

[0085] Compared with the related art, the first end of the first feeding unit in the single-aperture feeding circuit is connected with the NFC chip through the chip direct bonding micro-needle pin (CDMP) interface, so that the first feeding unit can be connected to the internal ground end of the NFC chip through the CDMP interface. Since the internal ground end of the NFC chip is close to the target antenna, the first feeding unit can be connected to the internal ground end of the NFC chip through the CDMP interface to obtain the changes of the target antenna in real time through the CDMP interface. Based on different states of the target antenna, the single capacitor in the first feeding unit in the prior art is changed to the first capacitor and the second capacitor in parallel, and the single capacitor in the second feeding unit is changed to the fourth capacitor and the fifth capacitor in parallel, and the sixth capacitor and the seventh capacitor in parallel, so that the fixed impedance adjustment of the application can be dynamically adjusted within the adjustment range, and the internal impedance of the NFC chip can be dynamically adjusted, so that the adjusted internal impedance of the NFC chip is more suitable for the impedance of the target antenna. By using the single-aperture feeding circuit to connect with the single-port feeding point contained in the target antenna, good impedance matching between the antenna and the feeding circuit can be easily achieved, signal reflection and loss are reduced, and user experience is improved.

[0086] Further, the application also provides a near field communication system, which comprises: an NFC chip, a target antenna and a single-aperture feeding circuit as shown in Figure 1 The first end of the single-aperture feeding circuit is connected with the NFC chip through the CDMP interface, the second end of the single-aperture feeding circuit is connected with the NFC chip, the third end of the single-aperture feeding circuit is connected with the target antenna, the fourth end of the single-aperture feeding circuit is connected with the single-port feeding point of the target antenna through the antenna spring, and the fifth end of the single-aperture feeding circuit is grounded. The single-aperture feeding circuit is used to be connected to the internal ground end of the NFC chip through the CDMP interface, so that the NFC chip can obtain the changes of the target antenna in real time through the CDMP interface, and the impedance inside the NFC chip can be dynamically adjusted.

[0087] Optionally, the target antenna comprises a single-port feeding point and a lower point; the single-port feeding point is located at the edge of the back plate of the electronic device and is close to the lower edge of the stacked decorative component DECO; and the lower point is located obliquely above the single-port feeding point in the back plate of the electronic device and is close to the midpoint of the lower edge of the top speaker.

[0088] As shown in Figure 2 , the positions of the single-port feeding point and the lower point of the target antenna can be determined, but are not limited thereto.

[0089] Optionally, the effective length of the target antenna in the horizontal direction from the single-port feed point to the lower point is greater than or equal to a first predetermined length threshold; and the effective length of the target antenna in the vertical direction from the single-port feed point to the lower point is greater than or equal to a second predetermined length threshold.

[0090] The first predetermined length threshold is less than the second predetermined length threshold.

[0091] As shown in FIG. 1, the NFC antenna is provided with a single-port feed point and a lower point. Figure 3 As shown in FIG. 2, the NFC antenna is provided with a single-port feed point and a lower point.

[0092] For example, the effective length of the X-direction needs to be greater than the first predetermined length threshold, and the effective length of the Y-direction needs to be greater than the second predetermined length threshold. For example, the first predetermined length threshold can be 35 mm, and the second predetermined length threshold can be 40 mm.

[0093] It should be noted that the effective length of the wire cannot be opposite to the current cancellation, such as the Chinese character wire, the closed loop wire, and the like, which do not belong to the effective length of the wire. The target antenna can be an NFC electrical property path, which can be a flexible printed circuit board (FPC), a laser direct structuring (LDS), a part of a metal frame, or any material with metal properties.

[0094] Optionally, in the FPC wire area, the target antenna is provided with a predetermined width of ferrite on both sides; and in the inner corner area of the target antenna, the target antenna is provided with a predetermined area of ferrite.

[0095] As shown in FIG. 3, the 1 area and the 2 area in FIG. 2 can be the inner corner area of the target antenna, which needs to be enhanced by ferrite, and the general recommendation is about 5*10 mm. Figure 4 As shown in FIG. 4, the 3 area in FIG. 2 is the bottom of the FPC wire area of the NFC, which must be provided with ferrite, and the ferrite needs to be provided on both sides of the NFC wire, each with a width of 2 mm. Figure 4 Figure 4

[0096] ​​Compared with the related art, in the application, the first end of the first feeding unit in the single-aperture feeding circuit is connected with the NFC chip through a chip direct bonding micro-needle pin (CDMP) interface, so that the first feeding unit can be connected to the internal ground end of the NFC chip through the CDMP interface. Since the internal ground end of the NFC chip is close to the target antenna, the first feeding unit can be connected to the internal ground end of the NFC chip through the CDMP interface to obtain the target antenna changes in real time through the CDMP interface. Based on different states of the target antenna, the single capacitor of the first feeding unit in the prior art is changed into a first capacitor and a second capacitor in parallel, and the single capacitor in the second feeding unit is changed into a fourth capacitor and a fifth capacitor in parallel, and a sixth capacitor and a seventh capacitor in parallel, so that the fixed impedance adjustment of the application can be dynamically adjusted in the adjustment range, and the internal impedance of the NFC chip can be dynamically adjusted, so that the adjusted internal impedance of the NFC chip is more suitable for the target antenna impedance. By using the single-aperture feeding circuit to connect the single-port feeding point contained in the target antenna, good impedance matching between the antenna and the feeding circuit can be easily realized, signal reflection and loss are reduced, and user experience is improved.

[0097] Based on the above-mentioned near field communication system, the application further provides an electronic device, such as a smart phone, a tablet computer, a drone, a smart robot, a wearable device, and the like. The device includes the above-mentioned near field communication system.

[0098] Optionally, the above-mentioned entity device can further include a user interface, a network interface, a camera, a radio frequency (RF) circuit, a sensor, an audio circuit, a WI-FI module, and the like. The user interface can include a display screen (Display), an input unit such as a keyboard (Keyboard), and the like. The optional user interface can further include a USB interface, a card reader interface, and the like. The network interface can optionally include a standard wired interface, a wireless interface (such as a WI-FI interface), and the like.

[0099] Those skilled in the art can understand that the above-mentioned entity device structure provided by the embodiment does not constitute a limitation on the entity device, and can include more or fewer components, or combine certain components, or different component arrangements.

[0100] The storage medium can further include an operating system and a network communication module. The operating system is a program for managing hardware and software resources of the above-mentioned entity device, supporting the running of information processing programs and other software and / or programs. The network communication module is used to realize communication between the components in the storage medium and communication with other hardware and software in the information processing entity device.

[0101] Through the description of the above embodiments, those skilled in the art can clearly understand that the present application can be realized by means of software and necessary general hardware platforms, or by hardware. By applying the scheme of the present embodiment, compared with the related art, the first end of the first feeding unit in the single-aperture feeding circuit is connected with the NFC chip through the chip direct bonding micro-needle pin (CDMP) interface, so that the first feeding unit can be connected to the internal ground end of the NFC chip through the CDMP interface. Since the internal ground end of the NFC chip is close to the target antenna, the first feeding unit can be connected to the internal ground end of the NFC chip through the CDMP interface to obtain the changes of the target antenna in real time. Based on different states of the target antenna, by changing the single capacitor in the first feeding unit in the prior art into the first capacitor and the second capacitor in parallel, and changing the single capacitor in the second feeding unit into the fourth capacitor and the fifth capacitor in parallel, and the sixth capacitor and the seventh capacitor in parallel, the fixed impedance adjustment of the present application can be dynamically adjusted within the adjustment range, and the internal impedance of the NFC chip can be dynamically adjusted, so that the adjusted internal impedance of the NFC chip is more suitable for the target antenna impedance. By using the single-aperture feeding circuit to connect with the single-port feeding point contained in the target antenna, it is also easier to realize good impedance matching between the antenna and the feeding circuit, reduce signal reflection and loss, and thus improve user experience.

[0102] It should be noted that, in this document, the terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0103] The above description is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments described herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A single-aperture power supply circuit, characterized in that, Connecting the NFC chip and the target antenna, including: First power supply unit and second power supply unit; The first end of the first power supply unit is connected to the first end of the NFC chip via a chip-to-surface micro-pin CDMP interface. The second end of the first power supply unit is connected to the first end of the second power supply unit. The second end of the first power supply unit is also connected to the single-port power supply point of the target antenna.

2. The circuit according to claim 1, characterized in that, The first power supply unit includes a first capacitor, a second capacitor, and a first inductor; The first end of the first inductor is connected to the NFC chip through the CDMP interface, and the second end of the first inductor is connected to the first end of the first capacitor and the first end of the second capacitor. The second end of the first capacitor is connected to the second end of the second capacitor and the first end of the second feed unit. The second end of the first capacitor is also connected to the single-port feed point of the target antenna through an antenna spring.

3. The circuit according to claim 2, characterized in that, The second power supply unit includes a second inductor and a third capacitor; The first end of the second inductor is connected to the NFC chip, and the second end of the second inductor is connected to the first end of the third capacitor; The second terminal of the third capacitor is connected to the second terminal of the first capacitor and the second terminal of the second capacitor.

4. The circuit according to claim 3, characterized in that, The second power supply unit also includes a fourth capacitor and a fifth capacitor; The first end of the fourth capacitor is connected to the first end of the fifth capacitor and the target antenna, and the second end of the fourth capacitor is connected to the second end of the fifth capacitor, the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor.

5. The circuit according to claim 4, characterized in that, The second power supply unit also includes a sixth capacitor and a seventh capacitor; The first terminal of the sixth capacitor is connected to the first terminal of the seventh capacitor, the second terminal of the first capacitor, the second terminal of the second capacitor, the second terminal of the third capacitor, the second terminal of the fourth capacitor, and the second terminal of the fifth capacitor. The second terminal of the sixth capacitor is connected to the second terminal of the seventh capacitor, and the second terminal of the sixth capacitor and the second terminal of the seventh capacitor are grounded.

6. A near-field communication system, characterized in that, include: Near Field Communication (NFC) chip, target antenna, and single-aperture power supply circuit as described in any one of claims 1 to 5; The first terminal of the single-aperture feed circuit is connected to the NFC chip via a CDMP interface. The second terminal of the single-aperture feed circuit is connected to the NFC chip. The third terminal of the single-aperture feed circuit is connected to the target antenna. The fourth terminal of the single-aperture feed circuit is connected to the single-port feed point of the target antenna via an antenna spring. The fifth terminal of the single-aperture feed circuit is grounded.

7. The system according to claim 6, characterized in that, The target antenna includes a single-port feed and a ground point; The single-port feed point is located at the side edge of the back panel of the electronic device and near the lower edge of the DECO stacked decorative component of the electronic device; The lower point is located diagonally above the single-port power supply point in the back panel of the electronic device, and near the midpoint of the lower edge of the top speaker.

8. The system according to claim 7, characterized in that, The effective horizontal trace length of the target antenna from the single-port feed point to the lower location is greater than or equal to a first predetermined length threshold. In the target antenna, the effective vertical trace length between the single-port feed point and the lower location is greater than or equal to a second predetermined length threshold, and the first predetermined length threshold is less than the second predetermined length threshold.

9. The system according to claim 8, characterized in that, In the flexible printed circuit board (FPC) trace area, the target antenna has ferrite of predetermined width on both sides; and, In the inner arc region of the corner of the target antenna, the target antenna has a ferrite of a predetermined area.

10. An electronic device, characterized in that, It includes the circuit as described in any one of claims 1-5, or the system as described in any one of claims 6 to 9.

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