NFC assembly and intelligent terminal

Abstract

The utility model provides an NFC assembly and an intelligent terminal. The NFC assembly comprises an NFC chip, a first radiator, a flexible connecting line and a second radiator. The first radiator is arranged on a mainboard of the intelligent terminal and is connected with the NFC chip; the second radiator is arranged on a metal middle frame of the intelligent terminal; and the NFC chip is connected with the second radiator or the first radiator through the flexible connecting line. According to the technical scheme, the second radiator in the NFC assembly can be arranged on the middle frame of the intelligent terminal, so that a user can interact with an induction device through the second radiator arranged on the middle frame when using the intelligent terminal, and the problem that the size of an NFC antenna carried on a back plate is insufficient, and the size of the NFC antenna is too large is solved. Therefore, the problems of narrow radio frequency range, poor performance and poor NFC function experience of the NFC antenna are solved, and the user experience is improved.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to an NFC component and a smart terminal. Background Art

[0002] Usually, the NFC antenna in the NFC component of a smart terminal is placed on the back panel of the smart terminal. Due to other performance requirements of the smart terminal, the back panel is occupied by other devices in a larger size, such as the camera on the back panel is getting bigger and bigger, and the display area is set on the back panel.

[0003] During the process of conceiving and implementing this application, at least the following problems were found: the size of the NFC antenna on the back panel of the smart terminal is insufficient, resulting in a narrow radio frequency range of the NFC antenna, poor performance, and poor NFC function experience. In addition, the smart terminal can only interact with the NFC device on one side of the back panel. Once the back panel is blocked, the NFC function of the smart terminal cannot be used.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Utility Model Content

[0005] In response to the above technical problems, the present application provides an NFC component and a smart terminal, which solve the technical problems of the narrow radio frequency range and poor performance of existing NFC antennas.

[0006] The present application provides an NFC component, which is applied to a smart terminal, including an NFC chip, a first radiator, a flexible connecting line and a second radiator;

[0007] The first radiator is disposed on the main board of the smart terminal, and the first radiator is connected to the NFC chip;

[0008] The second radiator is disposed on the metal middle frame of the smart terminal, and the second radiator is connected to the NFC chip or the first radiator through the flexible connecting line.

[0009] Optionally, the flexible connecting line is connected to the first radiator;

[0010] The NFC component also includes an impedance matching circuit;

[0011] The input end of the impedance matching circuit is connected to the output end of the NFC chip, and the output end of the impedance matching circuit is connected to the first radiator.

[0012] Optionally, the NFC component further includes a phase conversion circuit;

[0013] The first input end of the phase conversion circuit is connected to the first output end of the NFC chip, the second input end of the phase conversion circuit is connected to the second output end of the NFC chip, and the output end of the phase conversion circuit is connected to the input end of the impedance matching circuit;

[0014] The phase conversion circuit is configured to adjust the first NFC signal and the second NFC signal output by the NFC chip to have the same phase.

[0015] Optionally, the impedance matching circuit includes a first matching capacitor, a second matching capacitor, a third matching capacitor and a first matching inductor;

[0016] A first end of the first matching inductor is connected to an output end of the NFC chip, and a second end of the first matching inductor is connected to a first end of a first matching capacitor and a first end of a second matching capacitor;

[0017] The second end of the second matching capacitor and the first end of the third matching capacitor are connected to the first radiator, and the second ends of the first matching capacitor and the third matching capacitor are grounded.

[0018] Optionally, the phase conversion circuit includes a phase adjustment inductor and a phase adjustment capacitor;

[0019] The input end of the phase adjustment inductor is connected to the first output end of the NFC chip, and the output end of the phase adjustment inductor is connected to the input end of the impedance matching circuit;

[0020] The input end of the phase adjustment capacitor is connected to the second output end of the NFC chip, and the output end of the phase adjustment capacitor is connected to the input end of the impedance matching circuit.

[0021] Optionally, the second radiator is connected to the NFC chip via the flexible connecting line;

[0022] The NFC component also includes a two-terminal differential impedance matching circuit;

[0023] The first input end of the two-end differential impedance matching circuit is connected to the first output end of the NFC chip, and the first output end of the two-end differential impedance matching circuit is connected to the first radiator; the second input end of the two-end differential impedance matching circuit is connected to the second output end of the NFC chip, and the second output end of the two-end differential impedance matching circuit is connected to the second radiator through the flexible connecting line.

[0024] Optionally, the two-terminal differential impedance matching circuit includes: a fourth matching capacitor, a fifth matching capacitor, a sixth matching capacitor, a seventh matching capacitor, an eighth matching capacitor, a ninth matching capacitor, a receiving adjustment capacitor, a second matching inductor and a third matching inductor.

[0025] Optionally, the first end of the second matching inductor is connected to the first output end of the NFC chip, and the second end of the second matching inductor is connected to the first end of the fourth matching capacitor and the first end of the fifth matching capacitor; the second end of the fifth matching capacitor and the first end of the sixth matching capacitor are connected to the first radiator, and the second ends of the fourth matching capacitor and the sixth matching capacitor are grounded; the first end of the third matching inductor is connected to the second output end of the NFC chip, and the second end of the third matching inductor is connected to the first end of the seventh matching capacitor and the first end of the eighth matching capacitor; the second end of the eighth matching capacitor and the first end of the ninth matching capacitor are connected to the second radiator through a flexible connecting line, and the second ends of the seventh matching capacitor and the ninth matching capacitor are grounded; the first end of the receiving adjustment capacitor is connected to the first end of the fifth matching capacitor, and the second end of the receiving adjustment capacitor is connected to the first end of the eighth matching capacitor.

[0026] Optionally, the NFC component further includes an isolation circuit;

[0027] One end of the isolation circuit is connected to the second radiator, and the other end of the isolation circuit is connected to the NFC chip through the flexible connection line;

[0028] The isolation circuit is configured to isolate the antenna signal of the multiplexed antenna from the NFC signal when there is a multiplexed antenna sharing the second radiator.

[0029] Optionally, when the flexible connecting line has a corner, the width of the flexible connecting line is greater than 3.5 mm.

[0030] Optionally, when the flexible connecting line has a corner, the NFC component further includes a magnetic field isolator, and the magnetic field isolator is arranged at the corner.

[0031] Optionally, the first radiator includes a flexible connecting line radiator, and the second radiator includes a flexible connecting line radiator.

[0032] Optionally, the first radiator includes a flexible connecting line radiator, and the second radiator includes a metal middle frame radiator.

[0033] Optionally, the first radiator includes a flexible connecting line radiator, and the second radiator includes at least one metal middle frame radiator connected through an inductive device.

[0034] Optionally, the first radiator includes a flexible connection line radiator, and the second radiator includes a flexible connection line radiator and a metal middle frame radiator connected via an inductive device.

[0035] Optionally, the first radiator includes a metal radiator on the mainboard, and the second radiator includes a flexible connecting line radiator.

[0036] Optionally, the first radiator includes a metal radiator on the mainboard, and the second radiator includes a metal middle frame radiator.

[0037] Optionally, the first radiator includes a metal radiator on the mainboard, and the second radiator includes at least one metal middle frame radiator connected via an inductive device.

[0038] Optionally, the first radiator includes a metal radiator on the mainboard, and the second radiator includes a flexible connection line radiator and a metal middle frame radiator connected by an inductive device.

[0039] Optionally, the first radiator includes at least one metal radiator connected via an inductive device, and the second radiator includes a flexible connecting line radiator.

[0040] Optionally, the first radiator includes at least one metal radiator connected via an inductive device, and the second radiator includes a metal middle frame radiator.

[0041] Optionally, the first radiator includes at least one metal radiator connected via an inductive device, and the second radiator includes at least one metal middle frame radiator connected via an inductive device.

[0042] Optionally, the first radiator includes at least one metal radiator connected via an inductive device, and the second radiator includes a flexible connection line radiator and a metal middle frame radiator connected via an inductive device.

[0043] Optionally, the first radiator includes a flexible connection line radiator and a metal radiator connected via an inductive device, and the second radiator includes a flexible connection line radiator.

[0044] Optionally, the first radiator includes a flexible connection line radiator and a metal radiator connected by an inductive device, and the second radiator includes a metal middle frame radiator.

[0045] Optionally, the first radiator includes a flexible connection line radiator and a metal radiator connected via an inductive device, and the second radiator includes at least one metal middle frame radiator connected via an inductive device.

[0046] Optionally, the first radiator includes a flexible connection line radiator and a metal radiator connected via an inductive device, and the second radiator includes a flexible connection line radiator and a metal middle frame radiator connected via an inductive device.

[0047] The present application also provides a smart terminal, comprising: the NFC component described in any one of the above items.

[0048] As described above, the NFC component of the present application can be applied to a smart terminal, including an NFC chip, a first radiator, a flexible connecting line, and a second radiator; the first radiator is arranged on the main board of the smart terminal and connected to the NFC chip; the second radiator is arranged on the metal middle frame of the smart terminal; the NFC chip is connected to the second radiator or the first radiator through the flexible connecting line. Through the above technical solution, it is possible to set the second radiator in the NFC component on the middle frame of the smart terminal, so that when using the smart terminal, the user can interact with the sensing device through the second radiator arranged on the middle frame, solving the problem that the NFC antenna has a narrow radio frequency range, poor performance, and poor NFC function experience due to the insufficient size of the NFC antenna mounted on the back panel, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0050] Figure 1 A schematic diagram of the hardware structure of a mobile terminal for implementing various embodiments of the present application;

[0051] Figure 2 The first embodiment shows a schematic structural diagram of an NFC component in which a first radiator and a second radiator are connected in parallel;

[0052] Figure 3 The first embodiment is a schematic structural diagram of an NFC component in which a first radiator and a second radiator are connected in series;

[0053] Figure 4 This is a schematic diagram of the first structure of a smart terminal in the prior art;

[0054] Figure 5 A second structural schematic diagram of a smart terminal in the prior art;

[0055] Figure 6 A second structural schematic diagram of an NFC component shown in the second embodiment;

[0056] Figure 7 This is a circuit diagram of a phase conversion circuit and an impedance matching circuit in an NFC component according to a second embodiment;

[0057] Figure 8 This is a third structural schematic diagram of the NFC component shown in the third embodiment;

[0058] Fig. 9 This is a circuit diagram of a two-terminal differential impedance matching circuit in an NFC component according to a third embodiment;

[0059] Fig.10 This is a fifth structural schematic diagram of the NFC component shown in the fourth embodiment;

[0060] Fig.11 A circuit diagram of an isolation circuit of an NFC component shown in a fourth embodiment;

[0061] Fig.12 This is a sixth structural schematic diagram of the NFC component shown in the fourth embodiment;

[0062] Fig.13 This is a seventh structural schematic diagram of the NFC component shown in the fourth embodiment;

[0063] Fig.14 This is a schematic diagram of an eighth structure of the NFC component shown in the fourth embodiment;

[0064] Fig.15 This is a ninth structural schematic diagram of the NFC component shown in the fourth embodiment.

[0065] The realization of the purpose, functional features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. The above-mentioned drawings have shown clear embodiments of this application, which will be described in more detail later. These drawings and textual descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0066] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0067] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. Optionally, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context in the specific embodiment.

[0068] It should be understood that, although the terms first, second, third, etc. may be used to describe various information in this article, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this article, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination". Furthermore, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or", "and / or", "including at least one of the following" etc. used in this application can be interpreted as inclusive, or mean any one or any combination. For example, “comprising at least one of the following: A, B, C” means “any of the following: A; B; C; A and B; A and C; B and C; A and B and C”, and for another example, “A, B or C” or “A, B and / or C” means “any of the following: A; B; C; A and B; A and C; B and C; A and B and C”. An exception to this definition will only occur when a combination of elements, functions, steps or operations are inherently mutually exclusive in some manner.

[0069] It should be understood that, although the various steps in the flowchart in the embodiment of the present application are displayed in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and it can be performed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and their execution order is not necessarily performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0070] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0071] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0072] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present application, and have no specific meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0073] The smart terminal 300 may be implemented in various forms. For example, the smart terminal 300 described in the present application may include smart terminals such as mobile phones, tablet computers, laptop computers, PDAs, portable media players (PMPs), navigation devices, wearable devices, smart bracelets, pedometers, etc.

[0074] Taking a mobile terminal as an example for explanation, those skilled in the art will appreciate that, in addition to components specifically used for mobile purposes, the configuration according to the embodiments of the present application can also be applied to a fixed type terminal.

[0075] See also Figure 1, which is a schematic diagram of the hardware structure of a mobile terminal for implementing various embodiments of the present application, the mobile terminal 100 may include: RF (Radio Frequency, radio frequency) unit 101, WiFi module 102, audio output unit 103, A / V (audio / video) input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, memory 109, processor 110, and power supply 111 and other components. Those skilled in the art can understand that Figure 1 The structure of the mobile terminal shown in the figure does not constitute a limitation on the mobile terminal. The mobile terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0076] Combine the following Figure 1 The following is a detailed introduction to the various components of the mobile terminal:

[0077] The radio frequency unit 101 can be used for receiving and sending signals during information transmission or communication. Specifically, after receiving the downlink information of the base station, it is sent to the processor 110 for processing; in addition, the uplink data is sent to the base station. Generally, the radio frequency unit 101 includes but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc. In addition, the radio frequency unit 101 can also communicate with the network and other devices through wireless communication. The above-mentioned wireless communications can use any communication standard or protocol, including but not limited to GSM (Global System of Mobile communication), GPRS (General Packet Radio Service), CDMA2000 (Code Division Multiple Access 2000), WCDMA (Wideband Code Division Multiple Access), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access), FDD-LTE (Frequency Division Duplexing-Long Term Evolution), TDD-LTE (Time Division Duplexing-Long Term Evolution) and 5G, etc.

[0078] WiFi is a short-range wireless transmission technology. Mobile terminals can help users send and receive emails, browse web pages, and access streaming media through WiFi module 102. It provides users with wireless broadband Internet access. Figure 1 The WiFi module 102 is shown, but it is understandable that it is not an essential component of the mobile terminal and can be omitted as required without changing the essence of the utility model.

[0079] The audio output unit 103 can convert the audio data received by the RF unit 101 or the WiFi module 102 or stored in the memory 109 into an audio signal and output it as sound when the mobile terminal 100 is in a call signal reception mode, a talk mode, a recording mode, a voice recognition mode, a broadcast reception mode, etc. Moreover, the audio output unit 103 can also provide audio output related to a specific function performed by the mobile terminal 100 (for example, a call signal reception sound, a message reception sound, etc.). The audio output unit 103 may include a speaker, a buzzer, etc.

[0080] The A / V input unit 104 is used to receive audio or video signals. The A / V input unit 104 may include a graphics processor (GPU) 1041 and a microphone 1042, and the graphics processor 1041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The processed image frame can be displayed on the display unit 106. The image frame processed by the graphics processor 1041 can be stored in the memory 109 (or other storage medium) or sent via the radio frequency unit 101 or the WiFi module 102. The microphone 1042 can receive sound (audio data) via the microphone 1042 in a telephone call mode, a recording mode, a voice recognition mode, and the like, and can process such sound into audio data. The processed audio (voice) data can be converted into a format output that can be sent to a mobile communication base station via the radio frequency unit 101 in the case of a telephone call mode. The microphone 1042 can implement various types of noise elimination (or suppression) algorithms to eliminate (or suppress) noise or interference generated in the process of receiving and sending audio signals.

[0081] The mobile terminal 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Optionally, the light sensor includes an ambient light sensor and a proximity sensor. Optionally, the ambient light sensor can adjust the brightness of the display panel 1061 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 1061 and / or the backlight when the mobile terminal 100 is moved to the ear. As a type of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in all directions (generally three axes), and can detect the magnitude and direction of gravity when stationary. It can be used for applications that identify the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors that can be configured on the mobile phone, such as fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., they will not be repeated here.

[0082] The display unit 106 is used to display information input by the user or information provided to the user. The display unit 106 may include a display panel 1061, which may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.

[0083] The user input unit 107 can be used to receive input digital or character information, and to generate key signal input related to the user settings and function control of the mobile terminal. Optionally, the user input unit 107 may include a touch panel 1071 and other input devices 1072. The touch panel 1071, also known as a touch screen, can collect the user's touch operation on or near it (such as the user's operation on the touch panel 1071 or near the touch panel 1071 using any suitable object or accessory such as a finger, stylus, etc.), and drive the corresponding connection device according to a pre-set program. The touch panel 1071 may include two parts: a touch detection device and a touch controller. Optionally, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into the touch point coordinates, and then sends it to the processor 110, and can receive and execute the command sent by the processor 110. In addition, the touch panel 1071 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 1071, the user input unit 107 may also include other input devices 1072. Optionally, the other input devices 1072 may include, but are not limited to, one or more of a physical keyboard, a function key (such as a volume control key, a switch key, etc.), a trackball, a mouse, a joystick, etc., which are not specifically limited here.

[0084] Optionally, the touch panel 1071 may cover the display panel 1061. When the touch panel 1071 detects a touch operation on or near it, it transmits the information to the processor 110 to determine the type of touch event. Then, the processor 110 provides corresponding visual output on the display panel 1061 according to the type of touch event. Figure 1 In the figure, the touch panel 1071 and the display panel 1061 are used as two independent components to implement the input and output functions of the mobile terminal. However, in some embodiments, the touch panel 1071 and the display panel 1061 can be integrated to implement the input and output functions of the mobile terminal, which is not limited here.

[0085] The interface unit 108 serves as an interface through which at least one external device can be connected to the mobile terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device with an identification module, an audio input / output (I / O) port, a video I / O port, a headphone port, etc. The interface unit 108 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the mobile terminal 100 or may be used to transmit data between the mobile terminal 100 and an external device.

[0086] The memory 109 can be used to store software programs and various data. The memory 109 can mainly include a program storage area and a data storage area. Optionally, the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory 109 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0087] The processor 110 is the control center of the mobile terminal. It uses various interfaces and lines to connect various parts of the entire mobile terminal. It executes various functions of the mobile terminal and processes data by running or executing software programs and / or modules stored in the memory 109, and calling data stored in the memory 109, so as to monitor the mobile terminal as a whole. The processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor and a modem processor. Optionally, the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 110.

[0088] The mobile terminal 100 may also include a power supply 111 (such as a battery) for supplying power to various components. Preferably, the power supply 111 may be logically connected to the processor 110 via a power management system, thereby implementing functions such as charging, discharging, and power consumption management through the power management system.

[0089] although Figure 1 Not shown, the mobile terminal 100 may further include a Bluetooth module, etc., which will not be described in detail here.

[0090] Based on the above-mentioned mobile terminal hardware structure, various embodiments of the present application are proposed.

[0091] First embodiment

[0092] Reference Figure 2 and Figure 3 A first embodiment of the NFC component of the present application is proposed. The NFC component of the embodiment of the present application can be applied to a smart terminal 300 (such as a mobile phone), including an NFC chip 210, a flexible connecting line 220, a second radiator 230 and a first radiator 240; the first radiator 240 is arranged on the main board of the smart terminal 300 and connected to the NFC chip 210; the second radiator 230 is arranged on the metal middle frame of the smart terminal 300, and the second radiator 230 is connected to the NFC chip 210 or the first radiator 240 through the flexible connecting line 220.

[0093] Optionally, there are two ways to set the NFC antenna. One is to place the NFC antenna above the mobile phone motherboard and next to the camera module. Figure 4 and Figure 5 Considering that camera modules are getting bigger and bigger and mobile phones will add a secondary screen above the mainboard, the space above the mainboard is relatively large, and there is not enough space for the NFC antenna. The second is to place the conventional NFC antenna above the mobile phone battery; usually when we hold the mobile phone in our hands, we hold the battery part. Since NFC requires the NFC antenna to face the sensing device, this will cause the user to hold the battery and not be able to use the NFC function, which is a poor experience and is not practical. The NFC antenna set on one side of the mainboard can only interact with the external NFC device through the back panel of the smart terminal 300. Once the back panel is blocked, it cannot interact with the NFC device.

[0094] Optionally, the NFC chip 210 is a device for generating an NFC signal. The NFC chip 210 can generate an NFC signal when interacting with a sensing device, or receive an NFC signal output by an external sensing device for signal processing. The first radiator 240 and the second radiator 230 are devices for transmitting NFC signals between sensing devices. The first radiator 240 and the second radiator 230 can send out the NFC signal generated by the NFC chip 210, and can also receive an NFC signal input by an external sensing device.

[0095] In this embodiment, the first radiator 240 may be an NFC coil, a metal radiator on a mainboard, a metal radiator on a backplane, or a flexible connecting wire radiator. The second radiator 230 may be provided by a metal middle frame of a smart terminal or by a flexible connecting wire. One side of the second radiator 230 is connected to the flexible connecting wire 220, and the other side is grounded. The flexible connecting wire 220 is a connecting wire used to connect the NFC chip 210 to the second radiator 230. Considering that in this embodiment, the NFC chip 210 may be provided inside the smart terminal 300, and the second radiator 230 is provided on the middle frame of the smart terminal 300, it is necessary to connect the NFC chip 210 to the second radiator 230 through a connecting wire. When establishing a connection between the NFC chip 210 and the second radiator 230, considering that other devices provided in the smart terminal 300 may cause the NFC chip 210 and the second radiator 230 to be unable to be directly connected through a hard wire, in this embodiment, the NFC chip 210 and the second radiator 230 may be connected through a flexible connecting wire 220. The flexible connection line 220 is composed of magnetic materials such as FPC and ferrite, and is mainly used to transmit signals between the NFC chip 210 and the second radiator 230 .

[0096] Optionally, the middle frame of the smart terminal 300 may include: a metal middle frame at the top of the smart terminal 300, a middle middle frame at the middle of the smart terminal 300, and a bottom middle frame at the bottom of the smart terminal 300. In this embodiment, considering that when the smart terminal 300 uses the NFC function, the middle middle frame and the bottom middle frame may be inconvenient to use the NFC function due to the influence of the user's grip, etc., therefore, in this embodiment, the second radiator 230 may be preferentially set at the metal middle frame position.

[0097] Optionally, when the smart terminal 300 is provided with a first radiator 240 and a second radiator 230, the first radiator 240 and the second radiator 230 may be connected in series or in parallel. Figure 3In the case where the first radiator 240 and the second radiator 230 are arranged in series, the same NFC signal can be radiated through the first radiator 240 and the second radiator 230, that is, the mainboard side and the metal middle frame side can both radiate the same NFC signal. Figure 2 When the first radiator 240 and the second radiator 230 are connected in parallel, any one of the radiators can directly radiate one NFC signal, that is, two different NFC signals can be radiated at the same time.

[0098] Optionally, when implementing the NFC function, if the first radiator 240 and the second radiator 230 are arranged in series, the NFC chip 210 can generate an NFC signal, and output the NFC signal to the first radiator 240, use the first radiator 240 to radiate the NFC signal to the external sensing device, and transmit it to the second radiator 230 arranged on the middle frame of the smart terminal 300 through the flexible connection line 220, and send it to the external sensing device through the second radiator 230. Optionally, the second radiator 230 can also receive the NFC signal input by the external sensing device, and then input the NFC signal to the NFC chip 210 through the flexible connection line 220 and the first radiator 240, and the first radiator 240 can also receive the NFC signal input by the external sensing device and directly input it to the NFC signal input by the external sensing device, thereby completing the interaction between the NFC signal and the sensing device.

[0099] Optionally, if the first radiator 240 and the second radiator 230 are arranged in parallel, the NFC chip 210 can generate an NFC signal and output the NFC signal to the first radiator 240, and use the first radiator 240 to radiate the NFC signal to the external sensing device; the NFC chip 210 can also be transmitted to the second radiator 230 arranged on the middle frame of the smart terminal 300 through the flexible connection line 220, and sent to the external sensing device through the second radiator 230. The second radiator 230 can also receive the NFC signal input by the external sensing device, and then input the NFC signal to the NFC chip 210 through the flexible connection line 220, and the first radiator 240 can also receive the NFC signal input by the external sensing device and directly input it to the NFC signal input by the external sensing device, thereby completing the interaction between the NFC signal and the sensing device.

[0100] Optionally, the sensing device may be a card or a POS device, such as an access control card, a sensor on an access control gate, etc.

[0101] Through the technical solution recorded in this embodiment, in the case of setting two radiators, and setting the second radiator 230 in the NFC component on the metal middle frame of the smart terminal 300, the user can interact with the sensing device through the second radiator 230 set on the middle frame when using the smart terminal 300, and the additional second radiator 230 is used to solve the problem that the NFC antenna on the back panel has a narrow radio frequency range, poor performance, and poor NFC function experience due to the insufficient size of the NFC antenna on the back panel, thereby improving the user experience. In addition, by setting the second radiator 230 on the top of the smart terminal 300, it is possible to establish a connection with the sensing device not only through the top of the smart terminal 300, but also through the front and back panels of the smart terminal 300. There can be a signal radiation area where the second radiator 230 and the sensing device intersect.

[0102] Second embodiment

[0103] Based on the above first embodiment, a second embodiment of the NFC component of the present application is proposed. Optionally, refer to Figure 6 In this embodiment, the flexible connecting line 220 is connected to the first radiator 240, and the NFC component also includes an impedance matching circuit 250; the input end of the impedance matching circuit 250 is connected to the output end of the NFC chip 210, and the output end of the impedance matching circuit 250 is connected to the first radiator 240.

[0104] Optionally, in order to avoid large loss of NFC signals during transmission of NFC signals by the NFC chip 210, an impedance matching circuit 250 is provided in this embodiment. The impedance matching circuit 250 can match the internal resistance of the NFC chip 210, reduce the loss of NFC signals, and improve the transmission efficiency of NFC signals.

[0105] Optionally, the impedance matching circuit 250 can be a matching circuit composed of conventional inductors and capacitors; or it can be an impedance matching circuit including a matching chip and related peripheral structures. When outputting an NFC signal, the NFC signal output by the NFC chip 210 passes through the impedance matching circuit 250 and is radiated and output through the first radiator 240; and the first radiator 240 can also input the NFC signal to the second radiator 230 through the flexible connection line 220, and radiate and output through the second radiator 230. When receiving an NFC signal, the NFC signal received by the second radiator 230 is input to the NFC chip 210 through the flexible connection line 220, the first radiator 240 and the impedance matching circuit 250.

[0106] Optionally, refer to Figure 7The impedance matching circuit includes a first matching capacitor C1, a second matching capacitor C2, a third matching capacitor C3 and a first matching inductor L1; optionally, a first end of the first matching inductor L1 is connected to the output end of the NFC chip 210, a second end of the first matching inductor L1 is connected to a first end of the first matching capacitor C1 and a first end of the second matching capacitor C2, a second end of the second matching capacitor C2 and a first end of the third matching capacitor C3 are connected to the first radiator 240, and second ends of the first matching capacitor C1 and the third matching capacitor C3 are grounded.

[0107] Optionally, the first to third capacitors and the first inductor L1 are used to form an impedance matching circuit, and the first to third capacitors and the first inductor L1 form the same internal resistance as the NFC chip 210. When the NFC signal is output, the impedance matching of the NFC signal is performed through the first inductor L1 and the first to third capacitors, which effectively reduces the loss of the NFC signal and improves the transmission efficiency of the NFC signal.

[0108] Optionally, refer to Figure 6 The NFC component further includes: a phase conversion circuit 260; a first input end of the phase conversion circuit 260 is connected to a first output end of the NFC chip 210, a second input end of the phase conversion circuit 260 is connected to a second output end 210 of the NFC chip 210, and an output end of the phase conversion circuit 260 is connected to an input end of the impedance matching circuit 250; the phase conversion circuit 260 is configured to adjust the first NFC signal and the second NFC signal output by the NFC chip 210 to the same phase.

[0109] Optionally, the phase conversion circuit 260 is a circuit for phase adjustment of the signal output by the NFC chip 210. For example, when the output signal is zero phase, the zero-phase NFC signal can be converted to a 180° phase by the phase conversion circuit 260. The phase conversion circuit 260 can be a circuit including a capacitor, an inductor or other device with a phase adjustment function. The phase adjustment of the NFC signal is achieved through internal capacitors or inductors.

[0110] Optionally, when the NFC chip 210 outputs an NFC signal, multiple NFC signals may be output, and the phases of the multiple NFC signals are not the same. In order to improve the output power of the NFC signal, the phase of some of the multiple NFC signals may be adjusted so that NFC signals of different phases are in the same phase, thereby achieving the superposition of multiple NFC signals and improving the output power of the NFC signal. That is, the phase conversion circuit 260 may adjust the multiple NFC signals output by the NFC chip 210 to the same phase. For example, when the NFC chip 210 has two output terminals, the NFC signals with different phases output by the two output terminals may be adjusted to the same phase.

[0111] Optionally, in Figure 7 In the embodiment, the phase conversion circuit 260 includes a phase adjustment inductor L2 and a phase adjustment capacitor C4; the input end of the phase adjustment inductor L2 is connected to the first output end of the NFC chip 210, and the output end of the phase adjustment inductor L2 is connected to the input end of the impedance matching circuit 250; the input end of the phase adjustment capacitor C4 is connected to the second output end of the NFC chip 210, and the output end of the phase adjustment capacitor C4 is connected to the input end of the impedance matching circuit 250.

[0112] Optionally, both the inductor and the capacitor can store energy, and during the energy storage process, a certain delay can be achieved for the voltage passing through the inductor or capacitor, thereby achieving phase adjustment of the signal. Figure 8 In the embodiment, the NFC chip 210 has two output terminals, the first output terminal and the second output terminal are both used to output NFC signals, and the phases of the NFC signal output through the first output terminal and the NFC signal output through the second output terminal are different.

[0113] Optionally, a capacitor or inductor may be connected in series to the first output terminal or the second output terminal of the NFC chip 210, and the phase of the NFC signal may be adjusted by the delay function of the capacitor or inductor, so that the phases of the NFC signals output from the two output terminals are the same. Optionally, a phase adjustment inductor L2 may be connected in series to the first output terminal, and the phase of the NFC signal output from the first output terminal may be made the same as the phase of the NFC signal output from the second output terminal by using the phase adjustment inductor L2 based on the phase of the NFC signal output from the second output terminal, thereby realizing the superposition of NFC signals and increasing the output power of NFC signals; Optionally, a phase adjustment capacitor C4 may be connected in series to the second output terminal, and the phase of the NFC signal output from the second output terminal may be made the same as the phase of the NFC signal output from the first output terminal by using the phase adjustment capacitor C4 based on the phase of the NFC signal output from the first output terminal, thereby realizing the superposition of NFC signals and increasing the output power of NFC signals.

[0114] Third embodiment

[0115] The third embodiment of the present application is proposed based on the first embodiment or the second embodiment. Optionally, refer to Figure 8 When the second radiator is connected to the NFC chip 210 through the flexible connection line 220, the NFC component further includes: a two-end differential impedance matching circuit 270; a first input end of the two-end differential impedance matching circuit 270 is connected to a first output end of the NFC chip 210, and a first output end of the two-end differential impedance matching circuit 270 is connected to the first radiator 240; a second input end of the two-end differential impedance matching circuit 270 is connected to a second output end of the NFC chip 210, and a second output end of the two-end differential impedance matching circuit 270 is connected to the second radiator 230 through the flexible connection line 220.

[0116] Optionally, the second radiator 230 is directly connected to the NFC chip 210 through the flexible connection line 220; the second radiator 230 is arranged in parallel with the first radiator 240 to form a dual-antenna differential structure. In this case, the conventional impedance matcher cannot match the NFC signals that the two radiators need to send or receive. In order to achieve NFC signal matching of the two radiators, a two-terminal differential impedance matching circuit 270 is also provided in this embodiment. The two-terminal differential impedance matching circuit 270 can simultaneously perform impedance matching on two NFC signals, thereby avoiding the existence of unmatched NFC signals, which causes poor performance of the NFC component.

[0117] Optionally, two matching branches are provided inside the two-terminal differential impedance matching circuit 270, one matching branch is connected to the first radiator 240, and the other matching branch is connected to the second radiator 230 through the flexible connection line 220. In the case where both the first output terminal and the second output terminal of the NFC chip 210 output NFC signals, the NFC signal output from the first output terminal is impedance matched through one of the matching branches and then output to the first radiator 240; the NFC signal from the second output terminal is matched through the other matching branch and then output to the second radiator 230.

[0118] Optionally, refer to Fig. 9 The two-terminal differential impedance matching circuit 270 includes: a fourth matching capacitor C5, a fifth matching capacitor C6, a sixth matching capacitor C7, a seventh matching capacitor C8, an eighth matching capacitor C9, a ninth matching capacitor C10, a receiving adjustment capacitor C11, a second matching inductor L3 and a third matching inductor L4.

[0119] Optionally, a first end of the second matching inductor L3 is connected to the first output end of the NFC chip 210, a second end of the second matching inductor L3 is connected to the first end of the fourth matching capacitor C5 and the first end of the fifth matching capacitor C6, a second end of the fifth matching capacitor C6 and a first end of the sixth matching capacitor C7 are connected to the first radiator 240, and the second ends of the fourth matching capacitor C5 and the sixth matching capacitor C7 are grounded; a first end of the third matching inductor L4 is connected to the second output end of the NFC chip 210, a second end of the third matching inductor L4 is connected to the first end of the seventh matching capacitor C8 and the first end of the eighth matching capacitor C9, a second end of the eighth matching capacitor C9 and a first end of the ninth matching capacitor C10 are connected to the second radiator 230 through a flexible connecting line 220, the second ends of the seventh matching capacitor C8 and the ninth matching capacitor C10 are grounded, a first end of the receiving adjustment capacitor C11 is connected to the first end of the fifth matching capacitor C6, and a second end of the receiving adjustment capacitor C11 is connected to the first end of the eighth matching capacitor C9.

[0120] Optionally, the fourth matching capacitor C5, the fifth matching capacitor C6, the sixth matching capacitor C7 and the second matching inductor L3 can form a matching branch; the seventh matching capacitor C8, the eighth matching capacitor C9, the ninth matching capacitor C10 and the third matching inductor L4 can form another matching branch. When the NFC signal is output through the first output terminal, the fourth matching capacitor C5, the fifth matching capacitor C6, the sixth matching capacitor C7 and the second matching inductor L3 are used for impedance matching, which effectively reduces the loss of the NFC signal and improves the transmission efficiency of the NFC signal; when the NFC signal is output through the second output terminal, the seventh matching capacitor C8, the eighth matching capacitor C9, the ninth matching capacitor C10 and the third matching inductor L4 are used for impedance matching, which effectively reduces the loss of the NFC signal and improves the transmission efficiency of the NFC signal.

[0121] Optionally, considering that there may be some interference between the two matching branches, when the first output terminal and the second output terminal simultaneously output NFC signals, the interference between the two matching branches may cause the NFC component to be unable to interact with the external NFC device normally. For example, when both radiators receive NFC signals, during the impedance matching process, the interference between the two NFC signals is relatively serious, which may cause the NFC chip 210 to be unable to receive a valid signal.

[0122] Optionally, in this embodiment, an additional receiving adjustment capacitor C11 is provided, and the receiving adjustment capacitor C11 can be used to isolate the two matching branches, thereby reducing the interference between the two matching branches, and effectively improving the performance of the NFC component. For example, when two radiators receive NFC signals at the same time, the receiving adjustment capacitor C11 can be used to adjust the NFC signals received by the two matching branches, thereby reducing the interference between the two matching branches during the signal reception process, and further improving the performance of the NFC component.

[0123] Fourth embodiment

[0124] The third embodiment of the present application is proposed based on any of the above embodiments, referring to Fig.10 and Fig.11 The NFC component further includes an isolation circuit 280 ; one end of the isolation circuit 280 is connected to the second radiator 230 , and the other end of the isolation circuit 280 is connected to the NFC chip 210 through the flexible connection line 220 .

[0125] Optionally, the second radiator 230 is a device for sending or receiving signals, and the second radiator 230 can be connected to different RF devices to transmit RF signals of different frequencies. By sharing the second radiator 230, it is effectively avoided that each antenna needs to be provided with a second radiator 230. The isolation circuit 280 is a circuit with a signal filtering function, and the isolation circuit 280 can filter out the signals of other antennas to avoid signal interference between antennas. In order to avoid interference, each antenna assembly can be provided with a corresponding isolation circuit 280 to filter out signal interference from other antennas.

[0126] Optionally, refer to Fig.11 ,exist Fig.11 The NFC component and the cellular antenna share the second radiator 230. In this case, the NFC component and the cellular antenna both need to be provided with an isolation circuit 280. The isolation circuit 280 on the NFC component can filter out interference from the cellular signal transmitted by the cellular antenna. The isolation circuit 280 provided on the cellular antenna can filter out interference from the NFC signal transmitted by the NFC component. The isolation circuit 280 can be a band-stop structure formed by connecting an inductor and a capacitor in parallel, and the interference signal can be filtered out by using the filtering characteristics of the inductor and the capacitor.

[0127] Optionally, the isolation circuit 280 is configured to isolate the antenna signal of the multiplexed antenna when there is a multiplexed antenna that shares the second radiator 230. The multiplexed antenna is an antenna that shares a second radiator 230 with the NFC component, and the shared antenna may be a cellular antenna, a Bluetooth antenna, etc.

[0128] Optionally, the output power of the NFC signal may be insufficient during the NFC chip 210 outputs the NFC signal. The NFC signal with insufficient power output to the sensing device through the flexible connecting line 220 and the second radiator 230 may not be able to complete normal information exchange.

[0129] Optionally, refer to Fig.12 and Fig.13 In the case where the NFC chip 210 and the second radiator 230 are connected by the flexible connection line 220, the path between the NFC chip 210 and the second radiator 230 is long enough to meet the radiator length requirement, and the NFC chip 210 and the second radiator 230 are connected straight. However, in the case where the path between the NFC chip 210 and the second radiator 230 is short, the flexible connection line 220 directly connects the NFC chip 210 and the second radiator 230 in a straight line, which may not meet the performance requirements of the NFC component. In this case, the flexible connection line 220 needs to be bent, that is, there is a corner, and then the NFC chip 210 and the second radiator 230 are connected.

[0130] Optionally, when there is a corner in the flexible connecting line 220, the directions of signal transmission in the flexible connecting line 220 at both ends of the corner are not the same, and due to the presence of other devices nearby, electromagnetic eddy currents are easily formed at the corner, which may have a certain impact on the transmission of the NFC signal, thereby affecting the user experience when using the NFC function.

[0131] Optionally, in order to solve the above problem, when the flexible connecting line 220 has a corner, the width of the flexible connecting line 220 can be increased. When the width of the flexible connecting line 220 increases, the strength of the internal NMFC signal will increase accordingly, and the influence of the electromagnetic eddy current will be relatively small, and thus will not affect the transmission of the NFC signal. Optionally, when avoiding eddy current interference by increasing the width of the flexible connecting line 220, the width of the flexible connecting line 220 needs to be greater than 3.5 mm.

[0132] Optionally, by increasing the width of the flexible connecting wire 220 as described above, it is necessary to have enough space on the back panel of the smart terminal 300 for setting a wider flexible connecting wire 220. In the case of insufficient space on the back panel, the influence of electromagnetic eddy currents can also be solved by other methods, such as isolating the magnetic field generated by the flexible connecting wire 220 on both sides of the corner and the magnetic field generated by other nearby devices through an isolation structure to avoid the generation of electromagnetic eddy currents, thereby avoiding the influence of electromagnetic eddy currents on NFC signals. Fig.12 and Fig.13In a specific implementation, a magnetic field isolator 290 can be provided at the inner corner of the corner of the flexible connecting wire 220. The magnetic field isolator 290 can effectively isolate the magnetic field generated by the flexible connecting wire 220 on both sides of the corner and the magnetic field generated by other nearby devices. The magnetic field isolator 290 can be an isolator composed of magnetic isolation materials such as ferrite or nanocrystal, and the size of the ferrite needs to be greater than 3mm*3mm to ensure the isolation effect of the magnetic field.

[0133] Optionally, if there is enough space on the back panel of the smart terminal 300, the transmission effect of the NFC signal can be further ensured and the user experience can be enhanced by increasing the width of the flexible connecting line 220 and setting a magnetic field isolator 290 at the inner corner of the corner of the flexible connecting line 220.

[0134] Optionally, when an isolation circuit 280 is provided between the flexible connection line 220 and the second radiator 230, a phase conversion circuit 260 can also be provided between the NFC chip 210 and the flexible connection line 220, thereby simultaneously realizing the use of the isolation circuit 280 to reduce the impact of cellular coexistence, and the use of the phase conversion circuit 260 to increase the power output of the NFC chip 210. Multiplexing and reducing the mutual influence between the cellular and NFC antennas, thereby enhancing the output power of the NFC signal.

[0135] Optionally, refer to Fig.14 When the first radiator 240 and the second radiator 230 are arranged in series, the NFC component can also include: an isolation circuit 280, a phase conversion circuit 260, an impedance matching circuit 250 and a magnetic field isolator 290 (or a widened flexible connection line 220). When a phase conversion circuit 260 is provided between the NFC chip 210 and the flexible connecting line 220, an isolation circuit 280 may also be provided between the flexible connecting line 220 and the second radiator 230, thereby realizing the reuse of the second radiator 230 and enhancing the output power of the NFC signal at the same time; when a phase conversion circuit 260 is provided between the NFC chip 210 and the flexible connecting line 220, a magnetic field isolator 290 is provided at the inner corner of the corner of the flexible connecting line 220, which not only realizes the power improvement of the NFC signal, but also avoids the electromagnetic eddy current interference at the corner of the flexible connecting line 220; when an isolation circuit 280 is provided between the flexible connecting line 220 and the second radiator 230, a magnetic field isolator 290 is provided at the inner corner of the corner of the flexible connecting line 220, which not only realizes the reuse of the second radiator 230, but also avoids the electromagnetic eddy current interference at the corner of the flexible connecting line 220.

[0136] Optionally, the NFC component may include: each of the isolation circuit 280, the impedance matching circuit 250, the phase conversion circuit 250 and the magnetic field isolator 290 (or widening the flexible connection line 220), which can simultaneously meet the multiplexing of the second radiator 230, the power boost of the NFC signal and the avoidance of electromagnetic eddy current interference at the corners of the flexible connection line 220.

[0137] Optionally, refer to Fig.15 , the first radiator 240 is arranged in parallel with the second radiator 230. Optionally, the first radiator 240 of the smart terminal 300 is usually arranged on one side of the mainboard. When there is a metal material on the mainboard, the first radiator 240 can be a metal radiator made of metal on the mainboard, such as a camera frame connected to the mainboard, or a flexible connection line radiator directly arranged on the mainboard.

[0138] Optionally, in order to ensure the radiation effect of the first radiator 240, it is necessary to ensure the electrical length of the first radiator 240. In the case where the length of the metal radiator is insufficient, multiple metal radiators can be connected so that the length of the first radiator 240 meets the radiation requirement of the NFC signal; of course, the electrical length of the first radiator 240 can also be increased by connecting one side of the metal radiator with insufficient length to the flexible connecting line radiator. In the specific setting process, in order to avoid certain interference between multiple metal radiators or between the metal radiator and the flexible connecting line radiator, in order to avoid affecting the performance of the NFC component, it is also necessary to set an inductive device between adjacent metal radiators or between the metal radiator and the flexible connecting line radiator, and form isolation through the inductive device to avoid electromagnetic interference between adjacent metal middle frames.

[0139] Optionally, considering that there may not be a metal structure for making a metal radiator on the motherboard of the smart terminal 300, in this case, the first radiator 240 can be made of a metal material with a radiation function, and can be set on the middle frame of the smart terminal 300 by bonding, inlaying, etc. Considering that the middle frame of the smart terminal 300 may be a metal middle frame or a non-metallic middle frame. In the case where the middle frame of the smart terminal 300 is a non-metallic middle frame, the non-metallic middle frame cannot be used as a radiator, and a second radiator 230 can be set on the middle frame. The second radiator 230 can be made of a metal material with a radiation function, and can be set on the middle frame of the smart terminal 300 by bonding, inlaying, etc.

[0140] Optionally, when the middle frame of the smart terminal 300 is a non-metal middle frame, the second radiator 230 that needs to be additionally provided can directly adopt a flexible connection line radiator. Since the flexible connection line 220 includes metal that can be used for radiation, the flexible connection line 220 will be extended and a portion of the flexible connection line 220 will be provided on the middle frame of the smart terminal 300 as a flexible connection line radiator.

[0141] Optionally, considering that the middle frame of some terminals 300 is a metal middle frame, which has a radiation function, the metal middle frame can be directly used as the second radiator 230 to send or receive NFC signals through the metal middle frame.

[0142] Optionally, considering that the electrical length of the second radiator 230 may affect the performance of the antenna, for example, when the overall length of the second radiator 230 is less than 15 mm, the frequency of the second radiator 230 sending and receiving NFC signals may be different from the standard NFC signal frequency, resulting in the NFC signal sent or received not being a standard signal, which may cause the NFC function to be unable to be used normally. In this embodiment, in order to ensure the performance of the NFC component, the overall length of the second radiator 230 needs to be limited. In order to meet the signal transmission capability of the second radiator 230, the length of the second radiator 230 is greater than 15 mm.

[0143] Optionally, during the setting process of the smart terminal 300, the metal on the mainboard may not meet the required length of the first radiator 240; at this time, the first radiator 240 made of a single metal structure cannot meet the use requirements of the NFC component. In order to further improve the radiation effect, in this embodiment, multiple metal radiators on the mainboard can also be spliced ​​or the flexible connecting line radiator and the metal radiator can be spliced ​​through an inductive device to obtain a first radiator 240 that meets the performance of the NFC component. A certain number of breaks will be set on the middle frame of the smart terminal 300 to isolate different metal middle frames. In the case of a large number of breaks, the size of each metal middle frame may not meet the electrical length requirements of the second radiator 230. In this case, multiple metal middle frames can be connected to form a second radiator 230 that meets the requirements, and then the second radiator 230 can be connected to the NFC chip 210 through a flexible connecting line 200.

[0144] Optionally, when the second radiator 230 is formed by connecting multiple metal middle frames, there may be certain interference between the metal middle frames. In order to avoid affecting the performance of the NFC component, it is also necessary to set an inductive device between adjacent metal middle frames, and form isolation through the inductive device to avoid electromagnetic interference between adjacent metal middle frames. That is, the second radiator 230 can be multiple metal middle frames connected by inductive devices.

[0145] Optionally, when the second radiator 230 composed of a plurality of metal middle frames is provided, the metal middle frames may be directly connected by using an inductor element, thereby forming the second radiator 230 with anti-electromagnetic interference.

[0146] Optionally, in order to ensure the electrical length of the second radiator 230, when the overall length of the metal middle frame does not meet the requirements, the second radiator 230 that meets the requirements of the NFC component can also be formed by connecting the flexible connecting wire radiator to the metal middle frame. Of course, in order to avoid signal interference between the NFC signal and the cellular antenna sharing the metal radiator, it is also necessary to set an inductive device between the flexible connecting wire radiator and the metal middle frame. That is, the second radiator is the flexible connecting wire radiator and the metal middle frame connected by the inductive device. The inductive device can be an inductor.

[0147] Optionally, the first radiator 240 may include a flexible connection line radiator, a metal radiator on the mainboard, at least one metal radiator connected via an inductive device, or a flexible connection line radiator and a metal radiator connected via an inductive device; the second radiator 230 may include: a flexible connection line radiator, a metal middle frame radiator, at least one metal middle frame radiator connected via an inductive device, or a flexible connection line radiator and a metal middle frame radiator connected via an inductive device.

[0148] Optionally, the first radiator 240 includes a flexible connecting line radiator, and the second radiator 230 includes a flexible connecting line radiator.

[0149] Optionally, the first radiator 240 includes a flexible connecting line radiator, and the second radiator 230 includes a metal middle frame radiator.

[0150] Optionally, the first radiator 240 includes a flexible connection line radiator, and the second radiator 230 includes at least one metal middle frame radiator connected through an inductive device.

[0151] Optionally, the first radiator 240 includes a flexible connection line radiator, and the second radiator 230 includes a flexible connection line radiator and a metal middle frame radiator connected through an inductive device.

[0152] Optionally, the first radiator 240 includes a metal radiator on the mainboard, and the second radiator 230 includes a flexible connection line radiator.

[0153] Optionally, the first radiator 240 includes a metal radiator on the mainboard, and the second radiator 230 includes a metal middle frame radiator.

[0154] Optionally, the first radiator 240 includes a metal radiator on the mainboard, and the second radiator 230 includes at least one metal middle frame radiator connected via an inductive device.

[0155] Optionally, the first radiator 240 includes a metal radiator on the mainboard, and the second radiator 230 includes a flexible connection line radiator and a metal middle frame radiator connected by an inductive device.

[0156] Optionally, the first radiator 240 includes at least one metal radiator connected via an inductive device, and the second radiator 230 includes a flexible connection line radiator.

[0157] Optionally, the first radiator 240 includes at least one metal radiator connected via an inductive device, and the second radiator 230 includes a metal middle frame radiator.

[0158] Optionally, the first radiator 240 includes at least one metal radiator connected via an inductive device, and the second radiator 230 includes at least one metal middle frame radiator connected via an inductive device.

[0159] Optionally, the first radiator 240 includes at least one metal radiator connected via an inductive device, and the second radiator 230 includes a flexible connection line radiator and a metal middle frame radiator connected via an inductive device.

[0160] Optionally, the first radiator 240 includes a flexible connection line radiator and a metal radiator connected through an inductive device, and the second radiator 230 includes a flexible connection line radiator.

[0161] Optionally, the first radiator 240 includes a flexible connection line radiator and a metal radiator connected by an inductive device, and the second radiator 230 includes a metal middle frame radiator.

[0162] Optionally, the first radiator 240 includes a flexible connection line radiator and a metal radiator connected via an inductive device, and the second radiator 230 includes at least one metal middle frame radiator connected via an inductive device.

[0163] Optionally, the first radiator 240 includes a flexible connection line radiator and a metal radiator connected via an inductive device, and the second radiator 230 includes a flexible connection line radiator and a metal middle frame radiator connected via an inductive device.

[0164] Optionally, refer to Fig.12 In this embodiment, the flexible connecting line 220 is connected to the second radiator 230 through the mainboard wiring of the smart terminal 300 and the spring or connector on the mainboard.

[0165] Optionally, in the process of establishing a connection between the NFC chip 210 and the second radiator 230, the flexible connecting line 220 is routed from the inside of the smart terminal 300, and the second radiator 230 is set on the middle frame outside the smart terminal 300. At this time, the flexible connecting line 220 cannot directly establish a connection with the external middle frame.

[0166] Optionally, considering that the spring clip and the connector on the mainboard can be connected to the middle frame outside the smart terminal 300, in this embodiment, the side of the flexible connecting line 220 that needs to be connected to the second radiator 230 can be connected to the mainboard of the smart terminal 300, and then the spring clip or the connector on the mainboard can be connected to the external middle frame of the smart terminal 300. The flexible connecting line 220 is connected to the mainboard through the mainboard routing of the smart terminal 300, and then the mainboard is connected to the middle frame through the spring clip or the connector on the mainboard, so that the NFC chip 210 is connected to the second radiator 230.

[0167] Optionally, the shrapnel is a metal shrapnel that can transmit NFC signals, and a metal structure that can be used to transmit NFC signals is also provided inside the connector. Two connectors or two shrapnel can be used for specific connection, one shrapnel or connector is used to establish a connection between the flexible connection line 220 and one end of the second radiator 230, and the other shrapnel or connector is used to connect the flexible connection line 220 to the other end of the second radiator 230. Of course, a shrapnel and a connector can also be used, one of which is used to connect the flexible connection line 220 to one end of the second radiator 230, and the other is used to connect the flexible connection line 220 to the other end of the second radiator 230.

[0168] Optionally, the flexible connection line 220 is connected to the second radiator 230 through the mainboard wiring and springs, the mainboard wiring and the connector. In addition, in order to avoid large NFC signal loss, an impedance matching circuit 250 is also provided to reduce the loss of the NFC signal, thereby further increasing the transmission effect of the NFC signal.

[0169] The present application also provides a smart terminal, including the NFC component described in any of the above embodiments. The specific components included in the NFC component and the connection relationship between the components can refer to the above first to third embodiments, which will not be described here.

[0170] It is understood that the above scenarios are only examples and do not constitute a limitation on the application scenarios of the technical solutions provided in the embodiments of the present application. The technical solutions of the present application can also be applied to other scenarios. For example, it is known to those skilled in the art that with the evolution of the system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0171] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0172] The steps in the method of the embodiment of the present application can be adjusted in order, combined and deleted according to actual needs.

[0173] The units in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0174] In the present application, the same or similar terminology concepts, technical solutions and / or application scenario descriptions are generally described in detail only the first time they appear. When they appear again later, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of the present application, for the same or similar terminology concepts, technical solutions and / or application scenario descriptions that are not described in detail later, reference can be made to the previous related detailed descriptions.

[0175] In the present application, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0176] The various technical features of the technical solution of the present application can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.

[0177] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An NFC component, applied to a smart terminal, characterized in that: It includes an NFC chip, a first radiator, a flexible connecting line and a second radiator; The first radiator is disposed on the main board of the smart terminal, and the first radiator is connected to the NFC chip; The second radiator is disposed on the metal middle frame of the smart terminal, and the second radiator is connected to the NFC chip or the first radiator through the flexible connecting line.

2. The NFC component according to claim 1, characterized in that The flexible connecting line is connected to the first radiator; The NFC component also includes an impedance matching circuit; The input end of the impedance matching circuit is connected to the output end of the NFC chip, and the output end of the impedance matching circuit is connected to the first radiator.

3. The NFC component according to claim 2, characterized in that The NFC component also includes a phase conversion circuit; The first input end of the phase conversion circuit is connected to the first output end of the NFC chip, the second input end of the phase conversion circuit is connected to the second output end of the NFC chip, and the output end of the phase conversion circuit is connected to the input end of the impedance matching circuit; The phase conversion circuit is configured to adjust the first NFC signal and the second NFC signal output by the NFC chip to the same phase.

4. The NFC component according to claim 3, characterized in that: The impedance matching circuit includes a first matching capacitor, a second matching capacitor, a third matching capacitor and a first matching inductor; A first end of the first matching inductor is connected to an output end of the NFC chip, and a second end of the first matching inductor is connected to a first end of a first matching capacitor and a first end of a second matching capacitor; The second end of the second matching capacitor and the first end of the third matching capacitor are connected to the first radiator, and the second ends of the first matching capacitor and the third matching capacitor are grounded; and / or, The phase conversion circuit includes a phase adjustment inductor and a phase adjustment capacitor; The input end of the phase adjustment inductor is connected to the first output end of the NFC chip, and the output end of the phase adjustment inductor is connected to the input end of the impedance matching circuit; The input end of the phase adjustment capacitor is connected to the second output end of the NFC chip, and the output end of the phase adjustment capacitor is connected to the input end of the impedance matching circuit.

5. The NFC component according to claim 1, characterized in that: The second radiator is connected to the NFC chip via the flexible connecting line; The NFC component also includes a two-terminal differential impedance matching circuit; The first input end of the two-terminal differential impedance matching circuit is connected to the first output end of the NFC chip, and the first output end of the two-terminal differential impedance matching circuit is connected to the first radiator; The second input end of the two-terminal differential impedance matching circuit is connected to the second output end of the NFC chip, and the second output end of the two-terminal differential impedance matching circuit is connected to the second radiator through the flexible connecting line.

6. The NFC component according to claim 5, characterized in that: The two-terminal differential impedance matching circuit includes: a fourth matching capacitor, a fifth matching capacitor, a sixth matching capacitor, a seventh matching capacitor, an eighth matching capacitor, a ninth matching capacitor, a receiving adjustment capacitor, a second matching inductor and a third matching inductor; A first end of the second matching inductor is connected to the first output end of the NFC chip, and a second end of the second matching inductor is connected to a first end of a fourth matching capacitor and a first end of a fifth matching capacitor; The second end of the fifth matching capacitor and the first end of the sixth matching capacitor are connected to the first radiator, and the second ends of the fourth matching capacitor and the sixth matching capacitor are grounded; A first end of the third matching inductor is connected to the second output end of the NFC chip, and a second end of the third matching inductor is connected to a first end of the seventh matching capacitor and a first end of the eighth matching capacitor; The second end of the eighth matching capacitor and the first end of the ninth matching capacitor are connected to the second radiator through a flexible connecting line, and the second ends of the seventh matching capacitor and the ninth matching capacitor are grounded; The first end of the receiving adjustment capacitor is connected to the first end of the fifth matching capacitor, and the second end of the receiving adjustment capacitor is connected to the first end of the eighth matching capacitor.

7. The NFC component according to claim 1, characterized in that: The NFC component also includes an isolation circuit; One end of the isolation circuit is connected to the second radiator, and the other end of the isolation circuit is connected to the NFC chip through the flexible connection line; The isolation circuit is configured to isolate the antenna signal of the multiplexed antenna from the NFC signal when there is a multiplexed antenna sharing the second radiator.

8. The NFC component according to claim 1, characterized in that: When the flexible connecting line has a corner, the width of the flexible connecting line is greater than 3.5 mm; and / or, When the flexible connecting line has a corner, the NFC component further includes a magnetic field isolator, and the magnetic field isolator is arranged at the corner.

9. The NFC component according to any one of claims 1 to 8, characterized in that: Include at least one of the following: The first radiator comprises a flexible connecting line radiator, and the second radiator comprises a flexible connecting line radiator; The first radiator includes a flexible connecting line radiator, and the second radiator includes a metal middle frame radiator; The first radiator includes a flexible connecting line radiator, and the second radiator includes at least one metal middle frame radiator connected through an inductive device; The first radiator includes a flexible connection line radiator, and the second radiator includes a flexible connection line radiator and a metal middle frame radiator connected by an inductive device; The first radiator comprises a metal radiator on the mainboard, and the second radiator comprises a flexible connecting line radiator; The first radiator includes a metal radiator on the mainboard, and the second radiator includes a metal middle frame radiator; The first radiator includes a metal radiator on the mainboard, and the second radiator includes at least one metal middle frame radiator connected via an inductive device; The first radiator includes a metal radiator on the mainboard, and the second radiator includes a flexible connection line radiator and a metal middle frame radiator connected by an inductive device; The first radiator comprises at least one metal radiator connected via an inductive device, and the second radiator comprises a flexible connecting line radiator; The first radiator includes at least one metal radiator connected via an inductive device, and the second radiator includes a metal middle frame radiator; The first radiator includes at least one metal radiator connected via an inductive device, and the second radiator includes at least one metal middle frame radiator connected via an inductive device; The first radiator includes at least one metal radiator connected via an inductive device, and the second radiator includes a flexible connection line radiator and a metal middle frame radiator connected via an inductive device; The first radiator includes a flexible connection line radiator and a metal radiator connected by an inductive device, and the second radiator includes a flexible connection line radiator; The first radiator includes a flexible connection line radiator and a metal radiator connected by an inductive device, and the second radiator includes a metal middle frame radiator; The first radiator includes a flexible connection line radiator and a metal radiator connected by an inductive device, and the second radiator includes at least one metal middle frame radiator connected by an inductive device; The first radiator includes a flexible connection line radiator and a metal radiator connected by an inductive device, and the second radiator includes a flexible connection line radiator and a metal middle frame radiator connected by an inductive device.

10. An intelligent terminal, characterized in that: The NFC component comprises the NFC component according to any one of claims 1 to 9.

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