Near field communication device, detection method thereof and electronic equipment

Abstract

The invention relates to the technical field of communication, in particular to a near field communication device, a detection method thereof and electronic equipment, and the near field communication device comprises a first antenna which is used for receiving and transmitting an NFC signal in a first communication range; the second antenna is used for receiving and transmitting NFC signals in a second communication range, and at least parts of the first communication range and the second communication range are not overlapped; the first antenna and the second antenna are electrically connected with the NFC chip, and the NFC chip is used for alternately activating the first antenna and the second antenna and determining the position of the target equipment based on the signal intensity in the first communication range and the second communication range. According to the invention, accurate positioning and rapid identification of the target equipment can be realized.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technologies, and in particular, to a near-field communication device, a detection method thereof, and an electronic device. Background Art

[0002] NFC (Near Filed Comunication) technology has been widely used in multiple fields such as payment, access control, data transmission, and smart home due to its convenience and security.

[0003] In order to improve the communication efficiency, a near-field communication device needs to locate a target device. With the development of positioning technologies, higher requirements have been put forward for the positioning and identification of target devices in a short-distance space. However, traditional short-distance identification and positioning solutions have problems such as high cost and slow identification speed, seriously reducing the user experience and restricting the wide application of short-distance positioning technologies. Summary of the Invention

[0004] To solve the above technical problems, the present disclosure provides a near-field communication device, a detection method thereof, and an electronic device, which can achieve precise positioning and rapid identification of a target device.

[0005] In a first aspect, the present disclosure provides a near-field communication device, including: a first antenna configured to receive and transmit NFC signals within a first communication range; a second antenna configured to receive and transmit NFC signals within a second communication range, where at least part of the first communication range and the second communication range do not overlap; an NFC chip, where both the first antenna and the second antenna are electrically connected to the NFC chip, and the NFC chip is configured to alternately activate the first antenna and the second antenna and determine the position of the target device based on the signal strengths within the first communication range and the second communication range.

[0006] In some embodiments, part of the first communication range and the second communication range overlap.

[0007] In some embodiments, the first antenna and the second antenna are located on the same film layer, and there is a first gap between the first antenna and the second antenna, and the first gap is located within both the first communication range and the second communication range.

[0008] In some embodiments, the first antenna is a dual-ended antenna, and the second antenna is a single-ended antenna; the NFC chip includes two transmission ports, both ends of the first antenna are electrically connected to the two transmission ports respectively, the first end of the second antenna is electrically connected to both transmission ports, and the second end of the second antenna is grounded.

[0009] In some embodiments, the near-field communication device further includes a first matching circuit and a second matching circuit. The first matching circuit is connected between the first antenna and the two transmitting ports, and the second matching circuit is connected between the first end of the second antenna and the two transmitting ports.

[0010] In some embodiments, the NFC chip includes two first receiving ports and one second receiving port. The two ends of the first antenna are electrically connected to the two first receiving ports respectively, and the first end of the second antenna is electrically connected to the second receiving port.

[0011] In some embodiments, the near-field communication device further includes a first filtering circuit and a second filtering circuit. The first filtering circuit is connected between the first antenna and the two first receiving ports, and the second filtering circuit is connected between the first end of the second antenna and the second receiving port.

[0012] In a second aspect, the present disclosure also provides a detection method for a near-field communication device, which is applied to a near-field communication device. The near-field communication device includes: a first antenna, a second antenna, and an NFC chip. The first antenna is used to receive and transmit NFC signals within a first communication range, and the second antenna is used to receive and transmit NFC signals within a second communication range. The first communication range and the second communication range at least partially do not overlap. Both the first antenna and the second antenna are electrically connected to the NFC chip. The detection method includes: alternately activating the first antenna and the second antenna; determining the position of the target device based on the signal intensities within the first communication range and the second communication range.

[0013] In some embodiments, the first antenna is a dual-ended antenna, the second antenna is a single-ended antenna, the NFC chip includes two transmitting ports, the two ends of the first antenna are electrically connected to the two transmitting ports respectively, the first end of the second antenna is electrically connected to both of the two transmitting ports, and the second end of the second antenna is grounded. The detection method further includes: the two transmitting ports output signals with opposite phases to activate the first antenna; the two transmitting ports output signals with the same phase to activate the second antenna.

[0014] In a third aspect, the present disclosure also provides an electronic device, and the electronic device includes the above-mentioned near-field communication device.

[0015] The technical solution provided by the present disclosure has the following advantages compared with the prior art:

[0016] The near-field communication device provided by the present disclosure includes a first antenna, a second antenna, and an NFC chip. Both the first antenna and the second antenna are electrically connected to the NFC chip. The first antenna is used to receive and transmit NFC signals within a first communication range, and the second antenna is used to receive and transmit NFC signals within a second communication range. The NFC chip is used to alternately activate the first antenna and the second antenna. When the NFC chip activates the first antenna, the NFC chip can determine whether the target device is within the first communication range based on the signal strength within the first communication range. When the NFC chip activates the second antenna, the NFC chip can determine whether the target device is within the second communication range based on the signal strength within the second communication range. That is, the NFC chip can determine the position of the target device based on the signal strengths within the first communication range and the second communication range, thereby enabling the positioning of the target device, and enabling accurate positioning and rapid identification of the target device. At the same time, the NFC chip alternately activates the first antenna and the second antenna, so that accurate positioning and rapid identification of the target device can be achieved without setting an external switch or multiple chips in the near-field communication device, greatly reducing the hardware cost, and being applicable to various scenarios such as smart terminals, payment devices, and wearable devices. This setting method not only solves the problems of high cost and slow identification in the traditional solution, but also provides technical support for the large-scale application of NFC technology in diversified terminals. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic layout structure diagram of a near-field communication device provided by the present disclosure;

[0020] Figure 2 It is a schematic diagram of a detection principle of a near-field communication device provided by the present disclosure;

[0021] Figure 3 It is a schematic structure diagram of another near-field communication device provided by the present disclosure;

[0022] Figure 4 It is a schematic flowchart of a detection method of a near-field communication device provided by the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to more clearly understand the above objects, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other.

[0024] In the following description, many specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all the embodiments.

[0025] In order to more fully understand the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are only for reference and explanation, and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other instances, well-known structures and devices may be shown in a simplified manner to simplify the drawings.

[0026] The terms "first", "second", etc. in the description and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such used data may be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising", "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0027] Unless otherwise specified, the term "plurality" means two or more.

[0028] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0029] The term "and / or" is a description of the associated relationship of objects, indicating that three relationships may exist. For example, A and / or B means: A or B, or, A and B these three relationships.

[0030] The term "corresponding" may refer to an associated relationship or a binding relationship. A corresponding to B means that there is an associated relationship or a binding relationship between A and B.

[0031] Figure 1 is a schematic diagram of the layout structure of a near-field communication device provided by the present disclosure. Refer to Figure 1 , the embodiments of the present disclosure provide a near-field communication device, including:

[0032] The first antenna ANT1, and the first antenna ANT1 is used to receive and transmit NFC signals within the first communication range;

[0033] A second antenna ANT2, which is used to receive and transmit NFC signals within a second communication range, and at least part of the first communication range and the second communication range do not overlap;

[0034] An NFC chip 10, both the first antenna ANT1 and the second antenna ANT2 are electrically connected to the NFC chip 10. The NFC chip 10 is used to alternately activate the first antenna ANT1 and the second antenna ANT2, and is used to determine the position of the target device based on the signal strengths within the first communication range and the second communication range.

[0035] Specifically, the near-field communication device provided in this embodiment includes a first antenna ANT1, a second antenna ANT2, and an NFC chip 10. Both the first antenna ANT1 and the second antenna ANT2 are electrically connected to the NFC chip 10. Compared with positioning chips such as UWB and WIFI, the NFC chip 10 has the advantages of low cost and simple structure. At the same time, because the NFC chip 10 has a built-in security module, its security is higher than that of other positioning chips. And due to the special sending method of the NFC chip, the structure of the antenna can be flexible and variable. Therefore, in the near-field communication device, the NFC chip can be connected to both the first antenna ANT1 and the second antenna ANT2 at the same time.

[0036] The first antenna ANT1 is used to receive and transmit NFC signals within a first communication range. That is, when the first antenna ANT1 is activated, the first antenna ANT1 can receive and transmit NFC signals within the first communication range, and the communication range of the first antenna ANT1 is the first communication range. The second antenna ANT2 is used to receive and transmit NFC signals within a second communication range. That is, when the second antenna ANT2 is activated, the second antenna ANT2 can receive and transmit NFC signals within the second communication range, and the communication range of the second antenna ANT2 is the second communication range. Both the first antenna ANT1 and the second antenna ANT2 are electrically connected to the NFC chip 10. The NFC chip 10 is used to alternately activate the first antenna ANT1 and the second antenna ANT2. That is, the NFC chip 10 can first activate the first antenna ANT1 and then activate the second antenna ANT2, or first activate the second antenna ANT2 and then activate the first antenna ANT1. Optionally, a logic control module can be set in the NFC chip 10 to alternately activate the first antenna ANT1 and the second antenna ANT2 through the logic control module. When the NFC chip 10 activates the first antenna ANT1, the NFC chip 10 can determine whether the target device is within the first communication range according to the signal strength within the first communication range. When the NFC chip 10 activates the second antenna ANT2, the NFC chip 10 can determine whether the target device is within the second communication range according to the signal strength within the second communication range. That is, the NFC chip 10 can determine the position of the target device based on the signal strengths within the first communication range and the second communication range, thereby enabling the positioning of the target device and achieving precise positioning and rapid identification of the target device.

[0037] Meanwhile, the NFC chip 10 alternately activates the first antenna ANT1 and the second antenna ANT2, so that precise positioning and rapid identification of the target device can be achieved without setting an external switch or multiple chips in the near-field communication device, greatly reducing the hardware cost and being applicable to various scenarios such as smart terminals, payment devices, and wearable devices. This setting method not only solves the problems of high cost and slow identification in traditional solutions but also provides technical support for the large-scale application of NFC technology in diversified terminals.

[0038] Optionally, a signal strength detection module (RSSI) is set in the NFC chip 10. When the first antenna ANT1 is activated, it detects whether there is a signal of the target device in the first communication range. If the signal strength is higher than the threshold, it can be determined that the target device is in this area. Similarly, when the second antenna ANT2 is activated, it detects whether there is a signal of the target device in the second communication range. If the signal strength is higher than the threshold, it can be determined that the target device is in this area.

[0039] In some alternative embodiments, the first communication range and the second communication range partially overlap.

[0040] Specifically, continue to refer toFigure 1 , the first antenna ANT1 is used to receive and transmit NFC signals within a first communication range. That is, when the first antenna ANT1 is activated, it can receive and transmit NFC signals within the first communication range, and the communication range of the first antenna ANT1 is the first communication range. The second antenna ANT2 is used to receive and transmit NFC signals within a second communication range. That is, when the second antenna ANT2 is activated, it can receive and transmit NFC signals within the second communication range, and the communication range of the second antenna ANT2 is the second communication range. The first communication range and the second communication range partially overlap, so that it is possible to determine whether the target device is located in the overlapping part of the first communication range and the second communication range, or in the part of the first communication range that does not overlap with the second communication range, or in the part of the second communication range that does not overlap with the first communication range, or outside the first communication range and the second communication range, which is beneficial to improving the speed and accuracy of positioning the target device.

[0041] Exemplarily, referring to Figure 1 and Figure 2 , Figure 2 is a detection schematic diagram of a near-field communication device provided by the present disclosure. The first communication range includes area 1 and area 3, and the second communication range includes area 2 and area 2. The first communication range and the second communication range overlap at area 3. After the NFC chip 10 is powered on and the first antenna ANT1 is activated, if the signal strength is higher than the threshold, it is determined that the target device is located in area 1 or area 3. If the signal strength is not higher than the threshold, it is determined that the target device is located in area 2 or there is no target device in all areas. Then the second antenna ANT2 is activated. If the signal strength is higher than the threshold, it is determined that the target device is located in area 2 or area 3. If the signal strength is not higher than the threshold, it is determined that the target device is located in area 1 or there is no target device in all areas. That is, when the signal strengths identified by both the first antenna ANT1 and the second antenna ANT2 are higher than the threshold, it is determined that there is a target device in area 3. When the signal strengths identified by both the first antenna ANT1 and the second antenna ANT2 are not higher than the threshold, it is determined that there is no target device in all areas. When the signal strength identified by the first antenna ANT1 is higher than the threshold and the signal strength identified by the second antenna ANT2 is not higher than the threshold, it is determined that there is a target device in area 1. When the signal strength identified by the first antenna ANT1 is not higher than the threshold and the signal strength identified by the second antenna ANT2 is higher than the threshold, it is determined that there is a target device in area 2, thus realizing precise positioning of the target device.

[0042] Continuing to refer to Figure 1, in some alternative embodiments, the first antenna ANT1 and the second antenna ANT2 are located in the same film layer, and there is a first gap between the first antenna ANT1 and the second antenna ANT2, and the first gap is located in both the first communication range and the second communication range.

[0043] Specifically, the first antenna ANT1 and the second antenna ANT2 are located in the same film layer, that is, the first antenna ANT1 and the second antenna ANT2 are integrated in the same film layer, which is beneficial to simplifying the process and improving the production efficiency. At the same time, the first communication range and the second communication range partially overlap, so there is a first gap between the first antenna ANT1 and the second antenna ANT2, and the first gap is located in both the first communication range and the second communication range, that is, the first antenna ANT1 and the second antenna ANT2 are separated by a certain distance, which is beneficial to expanding the range of positioning detection.

[0044] Figure 3 is a schematic structural diagram of another near-field communication device provided by the present disclosure. Refer to Figure 3 , in some alternative embodiments, the first antenna ANT1 is a dual-ended antenna and the second antenna ANT2 is a single-ended antenna;

[0045] The NFC chip 10 includes two transmission ports (TX1 and TX2). Both ends of the first antenna ANT1 are electrically connected to the two transmission ports (TX1 and TX2) respectively. The first end of the second antenna ANT2 is electrically connected to both the two transmission ports (TX1 and TX2), and the second end of the second antenna ANT2 is grounded.

[0046] Specifically, the NFC chip 10 can be connected to a specific antenna to receive and transmit air interface waveform data that complies with the NFC specification, has multiple transmission ports and reception ports, and supports both single-ended and dual-ended transmission modes.

[0047] The first antenna ANT1 is a dual-ended antenna and the second antenna ANT2 is a single-ended antenna. Optionally, both the first antenna ANT1 and the second antenna ANT2 can be rectangular serpentine traces. Due to the characteristics of NFC communication, the resonance frequencies of both the first antenna ANT1 and the second antenna ANT2 can be around 13.56M. The impedance characteristic value of the dual-ended antenna is 10 ohms to 30 ohms, and the antenna impedance of the single-ended antenna is half of that of the dual-ended antenna. Although NFC communication is relatively short-range, when the target device is between the first antenna ANT1 and the second antenna ANT2, affected by the antenna radiation, the target device can still communicate with the first antenna ANT1 and the second antenna ANT2.

[0048] The NFC chip 10 includes two transmission ports (TX1 and TX2). The two ends of the first antenna ANT1 are electrically connected to the two transmission ports (TX1 and TX2) respectively, that is, one end of the first antenna ANT1 is electrically connected to the transmission port TX1, and the other end of the first antenna ANT1 is electrically connected to the transmission port TX2. The first end of the second antenna ANT2 is electrically connected to both of the two transmission ports (TX1 and TX2), and the second end of the second antenna ANT2 is grounded. When signals with opposite phases are output from the two transmission ports (TX1 and TX2), the signals output from the transmission ports (TX1 and TX2) are superposed in the same direction at the first antenna ANT1, thereby activating the first antenna ANT1. The signals output from the transmission ports (TX1 and TX2) are cancelled out in the opposite direction at the second antenna ANT2, so there is no energy radiation on the second antenna ANT2. When signals with the same phase are output from the two transmission ports (TX1 and TX2), the signals output from the transmission ports (TX1 and TX2) are superposed in the same direction at the second antenna ANT2, thereby activating the second antenna ANT2. The signals output from the transmission ports (TX1 and TX2) are cancelled out in the opposite direction at the first antenna ANT1, so there is no energy radiation on the first antenna ANT1. By means of the transmission ports (TX1 and TX2), the first antenna ANT1 and the second antenna ANT2 can be alternately activated, so that more NFC chips 10 can be adapted, and the adaptation range is wide.

[0049] Continue to refer to Figure 3 , in some optional embodiments, the near-field communication device further includes a first matching circuit 21 and a second matching circuit 22. The first matching circuit 21 is connected between the first antenna ANT1 and the two transmission ports (TX1 and TX2), and the second matching circuit 22 is connected between the first end of the second antenna ANT2 and the two transmission ports (TX1 and TX2).

[0050] Specifically, the first matching circuit 21 is connected between the first antenna ANT1 and the two transmission ports (TX1 and TX2). The first matching circuit 21 is used to adjust the impedance of the first antenna ANT1 and the first matching circuit 21. The second matching circuit 22 is connected between the first end of the second antenna ANT2 and the two transmission ports (TX1 and TX2). The second matching circuit 22 is used to adjust the impedance of the second antenna ANT2 and the second matching circuit 22. The first antenna ANT1 is a two-terminal antenna, and the second antenna ANT2 is a single-terminal antenna. Therefore, the first antenna ANT1 and the second antenna ANT2 use independent matching circuits to debug the impedance and frequency respectively, so that when the first antenna ANT1 and the second antenna ANT2 are alternately activated, the power transmission efficiency is maximized, and the signal reflection and energy loss are reduced.

[0051] Continue to refer to Figure 3, in some alternative embodiments, the NFC chip 10 includes two first receiving ports (RXN and RXP) and a second receiving port RX. Two ends of the first antenna ANT1 are electrically connected to the two first receiving ports (RXN and RXP) respectively, and the first end of the second antenna ANT2 is electrically connected to the second receiving port RX.

[0052] Specifically, two ends of the first antenna ANT1 are electrically connected to the two first receiving ports (RXN and RXP) respectively, that is, one end of the first antenna ANT1 is electrically connected to the first receiving port RXN, and the other end of the first antenna ANT1 is electrically connected to the first receiving port RXP, so as to receive signals of the dual - antenna through the first receiving ports (RXN and RXP). The first end of the second antenna ANT2 is electrically connected to the second receiving port RX, so as to receive signals of the single - antenna through the second receiving port RX.

[0053] Continue to refer to Figure 3 , in some alternative embodiments, the near - field communication device further includes a first filtering circuit 31 and a second filtering circuit 32. The first filtering circuit 31 is connected between the first antenna ANT1 and the two first receiving ports (RXN and RXP), and the second filtering circuit 32 is connected between the first end of the second antenna ANT2 and the second receiving port RX.

[0054] Specifically, the first filtering circuit 31 is arranged between the first antenna ANT1 and the two first receiving ports (RXN and RXP), and the second filtering circuit 32 is arranged between the first end of the second antenna ANT2 and the second receiving port RX, effectively suppressing out - of - band interference signals, improving the signal - to - noise ratio, and being beneficial to improving the positioning accuracy of the target device.

[0055] This embodiment provides a detection method for a near - field communication device, which is applied to the near - field communication device. Refer to Figure 1 , the near - field communication device includes: a first antenna ANT1, a second antenna ANT2, and an NFC chip 10. The first antenna ANT1 is used to receive and transmit NFC signals within a first communication range, the second antenna ANT2 is used to receive and transmit NFC signals within a second communication range, at least part of the first communication range and the second communication range do not overlap, and both the first antenna ANT1 and the second antenna ANT2 are electrically connected to the NFC chip 10.

[0056] Figure 4 is a schematic flowchart of a detection method for a near - field communication device provided by the present disclosure. Refer to Figure 4 , the detection method includes:

[0057] Step S100, alternately activate the first antenna and the second antenna.

[0058] Step S200: Determine the position of the target device based on the signal strengths within the first communication range and the second communication range.

[0059] Specifically, the detection method of the near-field communication device provided in this embodiment is applied to a near-field communication device. The near-field communication device includes a first antenna ANT1, a second antenna ANT2, and an NFC chip 10. Both the first antenna ANT1 and the second antenna ANT2 are electrically connected to the NFC chip 10. The NFC chip 10 has the advantages of low cost and simple structure compared with positioning chips such as UWB and WIFI. At the same time, because the NFC chip 10 has a built-in security module, its security is higher than that of other positioning chips. And due to the special transmission method of the NFC chip, the structure of the antenna can be flexible and variable. Thus, in the near-field communication device, the NFC chip can be connected to both the first antenna ANT1 and the second antenna ANT2 at the same time.

[0060] The first antenna ANT1 is used to receive and transmit NFC signals within the first communication range. That is, when the first antenna ANT1 is activated, the first antenna ANT1 can receive and transmit NFC signals within the first communication range, and the communication range of the first antenna ANT1 is the first communication range. The second antenna ANT2 is used to receive and transmit NFC signals within the second communication range. That is, when the second antenna ANT2 is activated, the second antenna ANT2 can receive and transmit NFC signals within the second communication range, and the communication range of the second antenna ANT2 is the second communication range. Both the first antenna ANT1 and the second antenna ANT2 are electrically connected to the NFC chip 10. The NFC chip 10 is used to alternately activate the first antenna ANT1 and the second antenna ANT2. That is, the NFC chip 10 can first activate the first antenna ANT1 and then activate the second antenna ANT2, or first activate the second antenna ANT2 and then activate the first antenna ANT1. Optionally, a logic control module can be set in the NFC chip 10 to alternately activate the first antenna ANT1 and the second antenna ANT2 through the logic control module. When the NFC chip 10 activates the first antenna ANT1, the NFC chip 10 can determine whether the target device is within the first communication range according to the signal strength within the first communication range. When the NFC chip 10 activates the second antenna ANT2, the NFC chip 10 can determine whether the target device is within the second communication range according to the signal strength within the second communication range. That is, the NFC chip 10 can determine the position of the target device based on the signal strengths within the first communication range and the second communication range, thereby realizing the positioning of the target device and achieving accurate positioning and rapid identification of the target device.

[0061] Meanwhile, the NFC chip 10 alternately activates the first antenna ANT1 and the second antenna ANT2, so as to achieve precise positioning and rapid identification of the target device without setting an external switch or multiple chips in the near-field communication device, greatly reducing the hardware cost and being applicable to various scenarios such as smart terminals, payment devices, and wearable devices. This setting method not only solves the problems of high cost and slow identification in the traditional solution, but also provides technical support for the large-scale application of NFC technology in diversified terminals.

[0062] Continue to refer to Figure 3 , in some alternative embodiments, the first antenna ANT1 is a dual-ended antenna, the second antenna ANT2 is a single-ended antenna, the NFC chip 10 includes two transmitting ports (TX1 and TX2), both ends of the first antenna ANT1 are electrically connected to the two transmitting ports (TX1 and TX2) respectively, the first end of the second antenna ANT2 is electrically connected to both of the two transmitting ports (TX1 and TX2), and the second end of the second antenna ANT2 is grounded.

[0063] The detection method further includes:

[0064] The two transmitting ports output signals with opposite phases to activate the first antenna;

[0065] The two transmitting ports output signals with the same phase to activate the second antenna.

[0066] Specifically, continue to refer to Figure 3 , the first antenna ANT1 is a dual-ended antenna, and the second antenna ANT2 is a single-ended antenna. Optionally, both the first antenna ANT1 and the second antenna ANT2 can be rectangular serpentine traces. Due to the characteristics of NFC communication, the resonance frequencies of both the first antenna ANT1 and the second antenna ANT2 can be around 13.56M. The impedance characteristic value of the dual-ended antenna is 10 ohms to 30 ohms, and the antenna impedance of the single-ended antenna is half of that of the dual-ended antenna. Although the NFC communication distance is relatively short, when the target device is between the first antenna ANT1 and the second antenna ANT2, affected by the antenna radiation, the target device can still communicate with the first antenna ANT1 and the second antenna ANT2.

[0067] The NFC chip 10 includes two transmitting ports (TX1 and TX2). Both ends of the first antenna ANT1 are electrically connected to the two transmitting ports (TX1 and TX2), that is, one end of the first antenna ANT1 is electrically connected to the transmitting port TX1, and the other end of the first antenna ANT1 is electrically connected to the transmitting port TX2. The first end of the second antenna ANT2 is electrically connected to both of the two transmitting ports (TX1 and TX2), and the second end of the second antenna ANT2 is grounded. When signals with opposite phases are output from the two transmitting ports (TX1 and TX2), the signals output from the transmitting ports (TX1 and TX2) are superposed in the same direction at the first antenna ANT1, thereby activating the first antenna ANT1. The signals output from the transmitting ports (TX1 and TX2) are cancelled out in the opposite direction at the second antenna ANT2, so there is no energy radiation on the second antenna ANT2. When signals with the same phase are output from the two transmitting ports (TX1 and TX2), the signals output from the transmitting ports (TX1 and TX2) are superposed in the same direction at the second antenna ANT2, thereby activating the second antenna ANT2. The signals output from the transmitting ports (TX1 and TX2) are cancelled out in the opposite direction at the first antenna ANT1, so there is no energy radiation on the first antenna ANT1. By means of the transmitting ports (TX1 and TX2), the first antenna ANT1 and the second antenna ANT2 can be alternately activated, so that more NFC chips 10 can be adapted, and the adaptation range is wide.

[0068] The embodiments of the present disclosure provide an electronic device, and the electronic device includes the above-mentioned near-field communication device. It can be understood that the electronic device provided by the embodiments of the present invention application can be any electronic product with NFC function, including but not limited to the following categories: mobile phones, televisions, laptop computers, desktop monitors, tablet computers, digital cameras, smart bracelets, smart glasses, in-vehicle displays, medical devices, industrial control devices, touch interaction terminals, etc. The embodiments of the present invention do not make special limitations on this.

[0069] The electronic device provided by the embodiments of the present disclosure has the same technical features as the near-field communication device provided by the above embodiments, so it can also solve the same technical problems and achieve the same technical effects.

[0070] The above description is only the preferred embodiments of the present disclosure and the description of the applied technical principles. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosure concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present disclosure.

[0071] In addition, although the operations are depicted in a particular order, this should not be construed as requiring that the operations be performed in the particular order shown or in sequential order. In certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although several specific implementation details are included in the foregoing discussion, these should not be construed as limitations on the scope of the present disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, the various features that are described in the context of a single embodiment can also be implemented separately or in any suitable sub-combination in multiple embodiments.

[0072] Although the subject matter has been described in language specific to structural features and / or methodological acts, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely example forms of implementing the claims.

[0073] The foregoing are only specific embodiments of the present disclosure, which enable those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be readily 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 disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A near field communication device, characterized in that, Comprising: A first antenna configured to receive and transmit NFC signals within a first communication range; A second antenna configured to receive and transmit NFC signals within a second communication range, wherein the first communication range and the second communication range are at least partially non - overlapping; An NFC chip, wherein both the first antenna and the second antenna are electrically connected to the NFC chip, and the NFC chip is configured to alternately activate the first antenna and the second antenna and to determine the location of a target device based on the signal strengths within the first communication range and the second communication range.

2. The near - field communication device according to claim 1, wherein: The first communication range and the second communication range partially overlap.

3. The near - field communication device according to claim 2, wherein: The first antenna and the second antenna are located in the same film layer, and there is a first gap between the first antenna and the second antenna, and the first gap is located within both the first communication range and the second communication range.

4. The near - field communication device according to claim 1, wherein: The first antenna is a dual - port antenna and the second antenna is a single - port antenna; The NFC chip includes two transmitting ports, two ends of the first antenna are respectively electrically connected to the two transmitting ports, a first end of the second antenna is electrically connected to both of the two transmitting ports, and a second end of the second antenna is grounded.

5. The near - field communication device according to claim 4, wherein: The near - field communication device further includes a first matching circuit and a second matching circuit, the first matching circuit is connected between the first antenna and the two transmitting ports, and the second matching circuit is connected between the first end of the second antenna and the two transmitting ports.

6. The near - field communication device according to claim 4, wherein: The NFC chip includes two first receiving ports and a second receiving port, two ends of the first antenna are respectively electrically connected to the two first receiving ports, and a first end of the second antenna is electrically connected to the second receiving port.

7. The near - field communication device according to claim 6, wherein: The near - field communication device further includes a first filtering circuit and a second filtering circuit, the first filtering circuit is connected between the first antenna and the two first receiving ports, and the second filtering circuit is connected between the first end of the second antenna and the second receiving port.

8. A detection method for a near field communication device, applied to the near field communication device, characterized in that, The near - field communication device includes: a first antenna, a second antenna, and an NFC chip. The first antenna is configured to receive and transmit NFC signals within a first communication range, the second antenna is configured to receive and transmit NFC signals within a second communication range, the first communication range and the second communication range are at least partially non - overlapping, and both the first antenna and the second antenna are electrically connected to the NFC chip; The detection method includes: Alternately activating the first antenna and the second antenna; Determining the location of the target device based on the signal strengths within the first communication range and the second communication range.

9. The detection method of the near field communication device according to claim 8, characterized in that the first antenna is a dual - terminal antenna, the second antenna is a single - terminal antenna, the NFC chip includes two transmission ports, two ends of the first antenna are respectively electrically connected to the two transmission ports, the first end of the second antenna is electrically connected to both of the two transmission ports, and the second end of the second antenna is grounded; The detection method further includes: the two transmission ports output signals with opposite phases to activate the first antenna; the two transmission ports output signals with the same phase to activate the second antenna.

10. An electronic device, characterized in that, The electronic device includes the near field communication device according to any one of claims 1 to 7.

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