NFC device and electronic device

Abstract

The present disclosure relates to the field of near field communication technology, and in particular to an NFC device and an electronic device, wherein the NFC device comprises: an antenna coil, which is arranged in a ring shape; a metal part, which partially overlaps with the antenna coil in a direction perpendicular to the plane where the antenna coil is located; and a current flowing through the metal part is opposite to a current flowing through a part of the antenna coil that overlaps with the metal part in a direction perpendicular to the plane where the antenna coil is located. The present disclosure can improve radio frequency performance while reducing production costs.

Description

Technical Field

[0001] The present disclosure relates to the field of near field communication technology, and in particular to an NFC device and an electronic device. Background Art

[0002] NFC (Near Field Communication) technology is becoming increasingly common in mobile devices. NFC functionality is primarily implemented by the NFC controller chip. The NFC controller (NFCC) implements the functions of the radio frequency front-end (RFF), including contactless technology detection, protocol activation, NFCEE management, routing management, and the NFC controller interface (NCI). The RF front-end is primarily responsible for establishing a near-field communication link with a remote endpoint based on a 13.56 MHz carrier.

[0003] However, as the user base grows, the cost of NFC systems is decreasing. An increasing number of products are equipped with NFC functionality. Mid- to high-end mobile phones now come standard with NFC, and some low-end, cost-effective devices also include NFC. Almost all wristbands and watches come standard with NFC. At the same time, the increasing size of mobile phone camera modules compresses the design area of ​​NFC antennas, making it difficult to improve RF performance. Wearable products such as wristbands and watches are even more difficult to improve due to their small design area. Summary of the Invention

[0004] In order to solve the above technical problems, the present disclosure provides an NFC device and an electronic device, which can reduce production costs while improving radio frequency performance.

[0005] In a first aspect, an embodiment of the present disclosure provides an NFC device, comprising: an antenna coil, the antenna coil being arranged in a ring shape; a metal portion, the metal portion partially overlapping the antenna coil in a direction perpendicular to the plane of the antenna coil; a current flowing through the metal portion in a direction opposite to a current flowing through the portion of the antenna coil that overlaps with the metal portion in a direction perpendicular to the plane of the antenna coil.

[0006] In some embodiments, a current value of the current flowing through the metal portion is smaller than a current value of the current flowing through the antenna coil.

[0007] In some embodiments, the antenna coil is arranged in a rectangular shape and includes four connected side portions; along a direction perpendicular to the plane where the antenna coil is located, the metal portion overlaps with at least one side portion.

[0008] In some embodiments, the metal portion overlaps only one side portion along a direction perpendicular to the plane where the antenna coil is located.

[0009] In some embodiments, the metal portion overlaps the two connected side portions along a direction perpendicular to the plane where the antenna coil is located.

[0010] In some embodiments, the metal portion includes a first edge, the first edge is located on a side of the metal portion close to the central hole of the antenna coil; and a distance between the first edge and an edge of the antenna coil closest thereto is less than 2 mm.

[0011] In some embodiments, the metal portion includes a second edge located on a side of the metal portion away from the central hole of the antenna coil; and a distance between the second edge and an edge of the antenna coil closest thereto is greater than or equal to 2 mm.

[0012] In some embodiments, the antenna coil includes multiple coils, and a gap is provided between two adjacent coils; the metal part includes multiple slits, and the slits and gaps at least partially overlap along a direction perpendicular to the plane where the antenna coil is located.

[0013] In some embodiments, at least one insulating layer is provided between the metal portion and the antenna coil.

[0014] In a second aspect, the present disclosure further provides an electronic device comprising the above-mentioned NFC device.

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

[0016] The NFC device provided herein features a ring-shaped antenna coil. A metal portion is provided within the NFC device. The metal portion partially overlaps the antenna coil in a direction perpendicular to the plane of the antenna coil. The metal portion is positioned in the area corresponding to a portion of the antenna coil. The current flowing through the metal portion is in the opposite direction to the current flowing through the portion of the antenna coil that overlaps with it in a direction perpendicular to the plane of the antenna coil. This means that the current flowing through the metal portion is in the opposite direction to the current flowing through the portion of the antenna coil that overlaps with it. Due to the metal's eddy current response, the metal portion generates opposing eddy currents. This significantly weakens the current flowing through the portion of the antenna coil that corresponds to it, thereby weakening the magnetic field generated by that portion of the antenna coil. This in turn reduces the canceling effect of the magnetic field generated by the portion of the antenna coil that is positioned opposite to it, thereby improving RF performance. The metal portion also directs magnetic field lines toward the central region of the antenna coil, further enhancing the magnetic field superposition effect in that region and ensuring a relatively uniform distribution of the overall radiated electromagnetic field around the antenna coil, increasing the effective radiation field strength and thus improving RF performance. Furthermore, the metal portion facilitates reducing the area of ​​the antenna coil and lowering production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0018] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 This is a structural diagram and current distribution diagram of an NFC device in the prior art;

[0020] Figure 2 This is a diagram of the Biot-Savart law for NFC antenna radiation;

[0021] Figure 3 This is a structural diagram and current distribution diagram of another NFC device in the prior art;

[0022] Figure 4 This is a structural diagram and current distribution diagram of another NFC device in the prior art;

[0023] Figure 5 yes Figure 4 Schematic diagram of the magnetic field direction and magnetic field distribution on the left and right sides of the NFC device;

[0024] Figure 6 yes Figure 4 Schematic diagram of the comprehensive magnetic field distribution after the left and right sides of the NFC device are superimposed;

[0025] Figure 7 This is a schematic structural diagram of an NFC device provided by the present disclosure;

[0026] Figure 8 yes Figure 7 Schematic diagram of the magnetic field direction and magnetic field distribution on the left and right sides of the NFC device;

[0027] Figure 9 yes Figure 7 Schematic diagram of the comprehensive magnetic field distribution after the left and right sides of the NFC device are superimposed;

[0028] Figure 10 is a structural diagram of another NFC device provided by the present disclosure;

[0029] Figure 11 This is a structural diagram of another NFC device provided by the present disclosure;

[0030] Figure 12This is a structural diagram of another NFC device provided by the present disclosure;

[0031] Figure 13 This is a structural diagram of another NFC device provided by the present disclosure;

[0032] Figure 14 This is a structural diagram of another NFC device provided by the present disclosure. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0035] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0036] The terms "first," "second," and the like in the specification and claims of the embodiments of the present disclosure and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0037] Unless otherwise stated, the term "plurality" means two or more.

[0038] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0039] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0040] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0041] In the prior art, NFC devices are prone to poor radio frequency performance when their size is reduced. To address this issue, the inventors conducted the following research on the prior art NFC devices:

[0042] Figure 1 This is a structural diagram and current distribution diagram of an NFC device in the prior art. Figure 2 This is a diagram of the Biot-Savart law of NFC antenna radiation, refer to Figure 1 and Figure 2 , Figure 1 The NFC device can be applied to conventional mobile phone products. In conventional mobile phone products, the antenna coil in the NFC device is relatively large, and the distance between two opposite sides of the four sides of the antenna coil is relatively large. Therefore, the magnetic fields generated by the four sides form a superposition effect, and the intensity of the overall radiated electromagnetic field is significantly improved, which is approximately equal to 4 times that of one side, thereby improving the radio frequency performance.

[0043] Figure 3 This is a structural diagram and current distribution diagram of another NFC device in the prior art. Figure 2 and Figure 3 , Figure 3 The NFC device described can be applied to conventional wristband and watch products. In conventional wristband and watch products, the size of the antenna coil in the NFC device is relatively small, and the distance between two opposite sides of the four sides of the antenna coil is relatively small. According to NFC radiation theory, since the distance between two opposite sides of the four sides of the antenna coil in conventional wristband and watch products is smaller than the distance between two opposite sides of the four sides of the antenna coil in conventional mobile phone products, the superposition effect of the magnetic fields generated by the four sides of the antenna coil in conventional wristband and watch products is weakened, and the intensity of the overall radiated electromagnetic field is not approximately equal to 4 times that of one side.

[0044] It should be noted that the magnetic field superposition effect is weakened in conventional bracelet and watch products, but the overall magnetic field strength is still greater than the magnetic field strength generated by one of the sides. Due to differences in product form, conventional bracelet and watch products have lower performance requirements than conventional mobile phone products. Therefore, this size structure can meet the user's usage scenarios.

[0045] It should be noted that in order to compare conventional mobile phone products with conventional wristband and watch products, Figure 1 The following example shows a size of the antenna coil in the NFC device. Figure 2The figure exemplarily shows one size of the antenna coil in the NFC device. In other embodiments of the present disclosure, the size of the antenna coil in the NFC device in the prior art may also be other values, which will not be described in detail in this disclosure.

[0046] Figure 4 This is a structural diagram and current distribution diagram of another NFC device in the prior art. Figure 5 yes Figure 4 Schematic diagram of the magnetic field direction and magnetic field distribution on the left and right sides of the NFC device, Figure 6 yes Figure 4 Schematic diagram of the comprehensive magnetic field distribution after the left and right sides of the NFC device are superimposed, refer to Figure 4-Figure 6 When the size of the antenna coil in the NFC device is further reduced, the distance between two opposite sides of the four sides of the antenna coil is also further reduced. At this time, the superposition effect of the magnetic fields generated by the four sides of the antenna coil is weakened, and even a negative effect is caused. Specifically, Figure 5 (a) shows the magnetic field direction and distribution on the left side of the antenna coil in the NFC device. Figure 5 (b) shows the magnetic field direction and distribution on the left side of the antenna coil in the NFC device, where the positions marked by the red and green boxes partially offset each other, resulting in a weakening of the overall radiation field strength. Figure 6 The outer field strength is significantly weakened due to excessive cancellation. That is, when the size of the antenna coil in the NFC device is miniaturized, the NFC antenna's radio frequency performance will be weakened.

[0047] To address the above technical issues, the disclosed embodiments of the present invention provide an NFC device and an electronic device, which can achieve miniaturization of the antenna coil in the NFC device, reduce production costs, and improve radio frequency performance.

[0048] The NFC device and electronic device provided by the embodiments of the present invention are exemplarily described below with reference to the accompanying drawings.

[0049] Figure 7 This is a schematic diagram of the structure of an NFC device provided by the present disclosure, with reference to Figure 7 This embodiment provides an NFC device, including:

[0050] The antenna coil 10 is arranged in a ring shape;

[0051] The metal portion 20 partially overlaps the antenna coil 10 in a direction perpendicular to the plane where the antenna coil 10 is located;

[0052] The direction of the current flowing through the metal portion 20 is opposite to the direction of the current flowing through the portion of the antenna coil 10 that overlaps with the metal portion 20 in a direction perpendicular to the plane where the antenna coil 10 is located.

[0053] Specifically, the antenna coil 10 in the NFC device is annular and includes a metal portion 20. The metal portion 20 partially overlaps the antenna coil 10 in a direction perpendicular to the plane of the antenna coil 10. This means that the metal portion 20 is located in an area corresponding to a portion of the antenna coil 10. The current flowing through the metal portion 20 is in the opposite direction to the current flowing through the portion of the antenna coil 10 that overlaps with it in a direction perpendicular to the plane of the antenna coil 10. This means that the current flowing through the metal portion 20 is in the opposite direction to the current flowing through the portion of the antenna coil 10 that overlaps with it. This means that the current flowing through the metal portion 20 is in the opposite direction to the current flowing through the portion of the antenna coil 10 that overlaps with it. Due to the metal's eddy current response, opposing eddy currents are generated in the metal portion 20. This significantly weakens the current flowing through the portion of the antenna coil 10 that corresponds to it, thereby weakening the magnetic field generated by that portion of the antenna coil 10. This in turn reduces the canceling effect of the magnetic field generated by the portion of the antenna coil 10 that is located opposite to it, thereby improving RF performance. Furthermore, the metal portion 20 can guide the magnetic flux lines toward the central region of the antenna coil 10, further enhancing the magnetic field superposition effect in this region. This also allows the overall radiated electromagnetic field to be relatively evenly distributed around the antenna coil 10, increasing the effective radiation field strength and improving RF performance. This also helps reduce the area of ​​the antenna coil 10 and lower production costs.

[0054] For example, for mobile phone products, this design can significantly reduce the antenna coil area, from the original 1000mm 2 The area can be reduced to 500mm 2 , without affecting the RF performance, the cost can be reduced by nearly half. For wristband and watch products, the original 500mm 2 The area can be reduced to 260mm 2 , without compromising RF performance, and reducing costs by 40%. Furthermore, the reduced antenna coil area can reduce the area of ​​the NFC device, making the electronic device layout more flexible.

[0055] In some embodiments, the current value of the current flowing through the metal part 20 is smaller than the current value of the current flowing through the antenna coil 10 , thereby avoiding the current value of the current flowing through the metal part 20 being larger, and avoiding the negative effect magnetic field generated by the part of the antenna coil 10 corresponding to the metal part 20 , which affects the RF performance.

[0056] Continue to refer Figure 7 In some embodiments, the antenna coil 10 is arranged in a rectangular shape, and the antenna coil 10 includes four connected side portions 11;

[0057] The metal portion 20 overlaps with at least one side portion 11 in a direction perpendicular to the plane where the antenna coil 10 is located.

[0058] Specifically, the antenna coil 10 is arranged in a rectangular shape, that is, the antenna coil 10 includes four connected side portions 11, with each of the four side portions 11 arranged opposite each other. In a direction perpendicular to the plane of the antenna coil 10, the metal portion 20 overlaps with at least one side portion 11, that is, the metal portion 20 is arranged in the area corresponding to a portion of the side portion 11, and the direction of the current flowing through the metal portion 20 is opposite to the direction of the current flowing through the corresponding side portion 11. Due to the eddy current response of the metal, the metal portion 20 generates reverse eddy currents, which significantly weakens the current flowing through the corresponding side portion 11, thereby weakening the magnetic field generated by the side portion 11. This in turn reduces the canceling effect of the magnetic field generated by the side portion 11 opposite to the side portion 11, which is beneficial for improving RF performance. At the same time, it is beneficial to reduce the distance between the side portion 11 and the side portion 11 opposite to it, which is beneficial for reducing the area of ​​the antenna coil 10.

[0059] Continue to refer Figure 7 In some embodiments, the metal portion 20 overlaps only one side portion 11 along a direction perpendicular to the plane where the antenna coil 10 is located.

[0060] For example, a metal portion 20 may be provided at a position corresponding to the left side portion 11 of the antenna coil 10. In a direction perpendicular to the plane of the antenna coil 10, the metal portion 20 only overlaps with the left side portion 11. The direction of the current I5 flowing through the metal portion 20 is opposite to the direction of the current I1 flowing through the left side portion 11. Figure 7-Figure 9 , Figure 8 yes Figure 7 Schematic diagram of the magnetic field direction and magnetic field distribution on the left and right sides of the NFC device, Figure 9 yes Figure 7 The schematic diagram of the combined magnetic field distribution of the left and right sides of the NFC device after superimposing them shows that the current I1 flowing through the left side 11 is weakened, resulting in a weakened magnetic field, thereby reducing the offsetting effect with the magnetic field generated by the right side 11. Ultimately, the overall radiated electromagnetic field strength is approximately four times that of one side 11, and the effective radiated field strength can even exceed four times, effectively increasing the effective radiated field strength and improving RF performance. This also helps reduce the distance between the left and right sides 11, thereby reducing the area of ​​the antenna coil 10.

[0061] It should be noted that Figure 7 exemplarily shows that the metal portion 20 can be provided at the corresponding position of the side portion 11 on the left side of the antenna coil 10. In other embodiments of the present disclosure, the metal portion 20 can also be provided at the corresponding positions of the side portions 11 on other sides of the antenna coil 10. Figure 10 , Figure 10is a structural diagram of another NFC device provided by the present disclosure, in which a metal portion 20 may be provided at a position corresponding to the upper side portion 11 of the antenna coil 10. Figure 11 , Figure 11 is a structural diagram of another NFC device provided by the present disclosure, in which a metal portion 20 may be provided at a position corresponding to the right side portion 11 of the antenna coil 10. Figure 12 , Figure 12 is a structural diagram of another NFC device provided by the present disclosure, in which a metal portion 20 may be provided at a position corresponding to the side portion 11 on the lower side of the antenna coil 10 .

[0062] Optionally, in other embodiments of the present disclosure, the antenna coil 10 may also be provided in a circular, elliptical or other annular structure. Accordingly, the setting of the metal part 20 may be provided with reference to the above embodiments, and the present disclosure will not elaborate on them one by one here.

[0063] Figure 13 This is a structural diagram of another NFC device provided by the present disclosure, refer to Figure 13 In some embodiments, the metal portion 20 overlaps the two connected side portions 11 along a direction perpendicular to the plane where the antenna coil 10 is located.

[0064] Specifically, the metal portion 20 overlaps the two connected side portions 11 in a direction perpendicular to the plane of the antenna coil 10. That is, the metal portion 20 is disposed in the region corresponding to the two connected side portions 11. The direction of the current flowing through the metal portion 20 is opposite to the direction of the current flowing through the corresponding side portion 11. Due to the eddy current response of the metal, a reverse eddy current is generated in the metal portion 20. This significantly weakens the current flowing through the corresponding side portion 11, thereby weakening the magnetic field generated by the side portion 11. This in turn reduces the canceling effect of the magnetic fields generated by the side portions 11 disposed opposite the two side portions 11, thereby improving RF performance. This also facilitates reducing the spacing between the two opposing side portions 11 in the antenna coil 10, thereby reducing the area of ​​the antenna coil 10.

[0065] Continue to refer Figure 7 In some embodiments, the metal portion 20 includes a first edge 21 , and the first edge 21 is located on a side of the metal portion 20 close to the central hole of the antenna coil 10 ;

[0066] The distance between the first edge 21 and the edge of the antenna coil 10 closest thereto is less than 2 mm.

[0067] Specifically, the edge of the metal part 20 on the side close to the center hole of the antenna coil 10 is the first edge 21, and the distance between the first edge 21 and the edge of the antenna coil 10 closest to it is less than 2 mm, that is, the coverage range of the metal part 20 cannot exceed 2 mm in the direction of the center hole of the antenna coil 10, so as to avoid the weakening of the magnetic field superposition effect in the middle area of ​​the antenna coil 10 due to the setting of the metal part 20.

[0068] Optionally, the distance between the first edge 21 and the edge of the antenna coil 10 closest to it is greater than 1 mm and less than 2 mm. A distance greater than 1 mm between the first edge 21 and the edge of the antenna coil 10 closest to it ensures that the metal portion 20 covers the corresponding side portion 11, reducing alignment difficulties.

[0069] Continue to refer Figure 7 In some embodiments, the metal portion 20 includes a second edge 22 , and the second edge 22 is located on a side of the metal portion 20 away from the central hole of the antenna coil 10 ;

[0070] The distance between the second edge 22 and the edge of the antenna coil 10 closest thereto is greater than or equal to 2 mm.

[0071] Specifically, the edge of the metal part 20 on the side away from the center hole of the antenna coil 10 is the second edge 22, and the distance between the second edge 22 and the edge of the antenna coil 10 closest to it is greater than or equal to 2 mm, that is, the coverage range of the metal part 20 toward the periphery of the antenna coil 10 is greater than or equal to 2 mm, which is beneficial to reducing the offsetting effect of the magnetic field generated by the side part 11 arranged opposite to the metal part 20, and is beneficial to improving the RF performance.

[0072] Optionally, along a direction perpendicular to the plane where the antenna coil 10 is located, the metal portion 20 does not overlap with the two oppositely disposed side portions 11 at the same time, so as to avoid negative effects caused by the arrangement of the metal portion 20 .

[0073] Figure 14 This is a structural diagram of another NFC device provided by the present disclosure, refer to Figure 14 In some embodiments, the antenna coil 10 includes a plurality of coils 12 , and a gap 13 is provided between two adjacent coils 12 ;

[0074] The metal portion 20 includes a plurality of slots 23 . Along a direction perpendicular to the plane where the antenna coil 10 is located, the slots 23 and the gap 13 at least partially overlap.

[0075] Specifically, the metal part 20 includes a plurality of slits 23. In a direction perpendicular to the plane where the antenna coil 10 is located, the slits 23 and the gap 13 at least partially overlap, that is, the metal part 20 is hollowed out, so that the magnetic lines of force radiate outward more evenly in the effective radiation direction, further improving the radio frequency communication performance.

[0076] Continue to refer Figure 7 In some embodiments, at least one insulating layer (not shown in the figure) is provided between the metal portion 20 and the antenna coil 10, so that the metal portion 20 and the antenna coil 10 are insulated from each other, and the directions of the currents flowing through the metal portion 20 and the antenna coil 10 can be opposite.

[0077] Optionally, the metal portion 20 may be provided on any side of the plane of the antenna coil 10 in a direction perpendicular to the plane of the antenna coil 10. Preferably, the metal portion 20 may be provided on the side of the middle region of the antenna coil 10 where the magnetic field direction is directed.

[0078] The disclosed embodiments of the present invention further provide an electronic device comprising the NFC device provided by any of the above embodiments. It is understood that the electronic device provided by the embodiments of the present invention can be any electronic product with NFC functionality, including but not limited to the following categories: mobile phones, televisions, laptops, desktop monitors, tablet computers, digital cameras, smart bracelets, smart glasses, vehicle-mounted displays, medical equipment, industrial control equipment, touch-screen interactive terminals, etc., and the embodiments of the present invention do not impose any particular limitations on this.

[0079] The electronic device provided in the disclosed embodiment of the present invention has the same technical features as the NFC device provided in the above embodiment, and can therefore solve the same technical problems and achieve the same technical effects.

[0080] Optionally, a metal structure is provided in the electronic device. For example, the metal structure may be a decorative part of the camera, a partial metal back cover, or a graphite sheet metal structure for heat dissipation. The metal part in the NFC device can reuse the metal structure in the electronic device, thereby helping to reduce production costs.

[0081] The above description is merely a preferred embodiment of the present disclosure and an illustration of the technical principles employed. 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-mentioned technical features, but also includes other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned disclosed concepts. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this disclosure.

[0082] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details have been included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0083] Although the subject matter has been described in language specific to structural features and / or methodological logical 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.

[0084] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and 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 may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. An NFC device, characterized in that: include: An antenna coil, wherein the antenna coil is arranged in a ring shape; a metal portion, wherein the metal portion partially overlaps the antenna coil along a direction perpendicular to the plane where the antenna coil is located; A direction of current flowing through the metal portion is opposite to a direction of current flowing through a portion of the antenna coil overlapping the antenna coil in a direction perpendicular to a plane where the antenna coil is located.

2. The NFC device according to claim 1, characterized in that: A current value of the current flowing through the metal portion is smaller than a current value of the current flowing through the antenna coil.

3. The NFC device according to claim 1, characterized in that: The antenna coil is arranged in a rectangular shape, and the antenna coil comprises four connected side parts; The metal portion overlaps with at least one of the side portions along a direction perpendicular to a plane where the antenna coil is located.

4. The NFC device according to claim 3, characterized in that: In a direction perpendicular to the plane where the antenna coil is located, the metal portion overlaps only one of the side portions.

5. The NFC device according to claim 3, characterized in that: Along a direction perpendicular to the plane where the antenna coil is located, the metal portion overlaps the two connected side portions.

6. The NFC device according to claim 1, characterized in that: The metal portion includes a first edge, and the first edge is located on a side of the metal portion close to the central hole of the antenna coil; The distance between the first edge and the edge of the antenna coil closest thereto is less than 2 mm.

7. The NFC device according to claim 1, characterized in that: The metal portion comprises a second edge, the second edge being located at a side of the metal portion away from the central hole of the antenna coil; A distance between the second edge and an edge of the antenna coil closest thereto is greater than or equal to 2 mm.

8. The NFC device according to claim 1, characterized in that: The antenna coil comprises a plurality of coils, and a gap is provided between two adjacent coils; The metal part includes a plurality of slots, and along a direction perpendicular to a plane where the antenna coil is located, the slots and the gap at least partially overlap.

9. The NFC device according to claim 1, characterized in that: At least one insulating layer is provided between the metal portion and the antenna coil.

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

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