Nfc antenna device and electronic device

Abstract

The application relates to the technical field of wireless communication, in particular to an NFC antenna device and an electronic device. A main circuit and a folding circuit are used for realizing signal transmission on a circuit board. The folding circuit is connected with a second connecting part, and the second circuit is extended from the inner side of the first circuit to the outer side of the first circuit through folding, so that the third connecting part is arranged outside the first circuit, and the welding of the first connecting part and the second connecting part is realized outside the first circuit. A separation layer arranged between the first circuit and the second circuit can avoid short circuit between the two, and a shielding layer arranged in the separation layer is used for isolating the first circuit and the second circuit from electromagnetic interference. Therefore, the performance stability of the NFC antenna device can be improved, and the manufacturing cost of the NFC antenna device is reduced.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and more specifically to an NFC antenna device and an electronic device. Background Technology

[0002] NFC stands for Near Field Communication, a short-range, high-frequency wireless communication technology that allows electronic devices to exchange data in a contactless, point-to-point manner. Current consumer electronics use FPC NFC designs. FPCs are made using either double-sided boards or silkscreened silver paste jumpers. Double-sided FPCs are more expensive, while silkscreened silver paste jumpers have poor stability. Summary of the Invention

[0003] The purpose of this application is to provide an NFC antenna device and an electronic device.

[0004] This application provides an NFC antenna device, comprising: a circuit board; a main circuit including a first circuit, a first connecting portion, and a second connecting portion disposed on the same side of the circuit board, the first circuit being arranged in a ring from the inside to the outside, the first connecting portion being disposed on the outside of the first circuit, and the second connecting portion being disposed on the inside of the first circuit; a folded circuit disposed on the same side of the circuit board as the main circuit, the folded circuit including a second circuit and a third connecting portion, the second circuit being connected to the second connecting portion, the third connecting portion being connected to the side of the second circuit opposite to the second connecting portion, a portion of the second circuit extending from the inside of the first circuit to the outside of the first circuit, and the third connecting portion being located outside the first circuit; and an isolation layer disposed between the first circuit and the second circuit, the isolation layer including at least a shielding layer for isolating electromagnetic interference between the first circuit and the second circuit.

[0005] In one exemplary embodiment of this application, the isolation layer further includes at least two insulating layers, and the shielding layer is disposed between the two insulating layers; preferably, at least one of the insulating layers is an adhesive layer; preferably, at least one of the insulating layers is a rubber layer.

[0006] In an exemplary embodiment of this application, the insulating layers are all adhesive layers; preferably, the length of the adhesive layer is greater than the width of the first line in the direction from the inside to the outside; preferably, the length of the adhesive layer is less than the length of the second line in the direction from the inside to the outside.

[0007] In one exemplary embodiment of this application, the shielding layer is a metal layer; preferably, the shielding layer is connected to a fixed potential; preferably, the shielding layer is grounded.

[0008] In an exemplary embodiment of this application, a portion of the first line is recessed inward to form a recessed section, and a second connecting portion is disposed on the inner side of the first line. The second connecting portion extends at least along the recessed section, and both the first connecting portion and the third connecting portion are disposed within the recessed area of ​​the recessed section. Preferably, the recessed section includes a first line segment, a second line segment, and a third line segment. The first line segment and the second line segment extend inward in the radial direction, and the first line segment and the second line segment are spaced apart. The third line segment connects the first line segment and the second line segment.

[0009] In one exemplary embodiment of this application, both the first connecting portion and the third connecting portion are arranged along the direction of the first line segment; or, both the first connecting portion and the third connecting portion are arranged along the direction of the second line segment; or, both the first connecting portion and the third connecting portion are arranged along the direction of the third line segment; preferably, the first connecting portion and the third connecting portion are arranged at intervals.

[0010] In one exemplary embodiment of this application, the second line is a curved line, which connects to the second connecting portion. The curved line extends at an angle to the recessed segment. The third connecting portion connects to the side of the curved line away from the second connecting portion. A portion of the curved line extends from the inside of the recessed segment to the outside of the recessed segment, and the third connecting portion is located within the recessed area. Preferably, a portion of the curved line extends from the inside of the first line segment to the outside of the first line segment. Preferably, a portion of the curved line extends from the inside of the second line segment to the outside of the second line segment. Preferably, a portion of the curved line extends from the inside of the third line segment to the outside of the third line segment.

[0011] In one exemplary embodiment of this application, the circuit board includes a motherboard and a folding board, the folding board being located inside the first line and connected to the motherboard; the folding board includes a first folded portion, a bent portion and a second folded portion, the first folded portion, the bent portion and the second folded portion being spaced apart from the motherboard, the first folded portion being connected to the motherboard, and the bent portion being disposed between the first folded portion and the second folded portion; preferably, the first folded portion, the bent portion and the second folded portion are respectively disposed corresponding to the second line.

[0012] In one exemplary embodiment of this application, the third connecting portion and the first connecting portion are located on the same plane; preferably, the third connecting portion and the first connecting portion are located on the same side of the circuit board.

[0013] This application also provides an electronic device including the aforementioned NFC antenna device.

[0014] This application discloses an NFC antenna device and electronic device, which have the following advantages: A main circuit and a folded circuit are used for signal transmission on a circuit board. The folded circuit connects to a second connecting portion. By folding, the second circuit extends from the inside of the first circuit to the outside of the first circuit, thereby placing a third connecting portion outside the first circuit. Simultaneously, the first and second connecting portions are soldered outside the first circuit. An isolation layer disposed between the first and second circuits prevents short circuits between them, and a shielding layer within the isolation layer isolates electromagnetic interference between the first and second circuits. Therefore, the performance stability of the NFC antenna device can be improved, and the manufacturing cost of the NFC antenna device can be reduced.

[0015] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part by practice of this application.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] Figure 1 This is a schematic diagram of the folded structure of an NFC device according to an embodiment of the present invention, wherein the first line is square;

[0019] Figure 2 This is a schematic diagram of the folded structure of an NFC device according to an embodiment of the present invention, wherein the first line is irregularly shaped;

[0020] Figure 3 This is a schematic diagram of the structure of the isolation layer in an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of an NFC device before folding in an embodiment of the present invention, wherein the first line is irregularly shaped, and the second line is formed by folding. Figure 2 The structure after folding;

[0022] Figure 5 This is a schematic diagram of the structure of an NFC device before folding in an embodiment of the present invention; wherein the first line is irregularly shaped, and the second line and the folding plate are folded to form... Figure 2 The structure after folding.

[0023] Explanation of reference numerals in the attached figures:

[0024] 10. Circuit board; 11. Main board; 12. Folding board; 121. First folding part; 122. Bending part; 123. Second folding part; 20. Main circuit; 21. First circuit; 211. Recessed section; 2111. First line segment; 2112. Second line segment; 2113. Third line segment; 22. First connecting part; 23. Second connecting part; 30. Folded circuit; 31. Second circuit; 311. First bending section; 312. First straight section; 313. Second bending section; 314. Second straight section; 32. Third connecting part; 40. Isolation layer; 41. Shielding layer; 42. Insulating layer. Detailed Implementation

[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0026] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0027] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present application, and should not be construed as limiting the present application.

[0028] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0029] NFC stands for Near Field Communication, a short-range, high-frequency wireless communication technology that allows electronic devices to exchange data in a contactless, point-to-point manner. Current consumer electronics use FPC NFC designs. FPCs are made using either double-sided boards or silkscreened silver paste jumpers. Double-sided FPCs are more expensive, while silkscreened silver paste jumpers have poor stability.

[0030] To solve the above technical problems, refer to Figures 1 to 3 As shown, this application provides an NFC antenna device, including a circuit board 10, a main circuit 20, a folded circuit 30, and an isolation layer 40. The main circuit 20 includes a first circuit 21, a first connection portion 22, and a second connection portion 23 disposed on the same side of the circuit board 10. The first circuit 21 is arranged in a ring from the inside to the outside, the first connection portion 22 is disposed on the outside of the first circuit 21, and the second connection portion 23 is disposed on the inside of the first circuit 21. The folded circuit 30 is disposed on the same side of the circuit board 10 as the main circuit 20. The folded circuit 30 includes a second circuit 31 and a third connection portion 32. The second circuit 31 is connected to the second connection portion 23, and the third connection portion 32 is connected to the side of the second circuit 31 away from the second connection portion 23. A portion of the second circuit 31 extends from the inside of the first circuit 21 to the outside of the first circuit 21, and the third connection portion 32 is located outside the first circuit 21. The isolation layer 40 is disposed between the first circuit 21 and the second circuit 31. The isolation layer 40 includes at least a shielding layer 41 for isolating electromagnetic interference between the first circuit 21 and the second circuit 31. The main line 20 and the folded line 30 are used to transmit signals on the circuit board 10. The folded line 30 connects to the second connection portion 23. By folding, the second line 31 extends from the inside of the first line 21 to the outside of the first line 21, thereby placing the third connection portion 32 outside the first line 21. Simultaneously, the first connection portion 22 and the second connection portion 23 are soldered outside the first line 21. An isolation layer 40 disposed between the first line 21 and the second line 31 prevents short circuits between them, and a shielding layer 41 is provided in the isolation layer 40 to isolate electromagnetic interference between the first line 21 and the second line 31. This improves the performance stability of the NFC antenna device and reduces its manufacturing cost.

[0031] In some embodiments, the circuit board 10 can be a rigid circuit board 10 or a flexible circuit board 10. In the NFC antenna device, the circuit board 10 is typically a flexible circuit board. The circuit board 10 can be a single-layer board, a double-layer board, or a multi-layer board. Preferably, the circuit board 10 is a single-layer board, which can greatly reduce the cost of the NFC antenna device. Furthermore, using a single-layer board facilitates the use of a whole original board and a one-time exposure, development, and etching process to fabricate the circuit when manufacturing the NFC antenna device.

[0032] In some embodiments, the main line 20 and the folded line 30 are integrally arranged, and the main line 20 and the folded line 30 are made of the same material, including metal materials such as copper, iron, and aluminum, which are selected according to the actual situation.

[0033] In some embodiments, the first route 21 has multiple loops, the specific number of which is selected according to the actual situation. Preferably, the first route 21 has 4 loops.

[0034] In some embodiments, the first line 21 can be spirally formed into a regular, rectangular, or irregular shape. (See reference...) Figure 1 As shown, the first line 21 is spirally oriented in the positive direction. The first connecting portion 22 in the main line 20 extends outward from the first line 21. The second connecting portion 23 is located inside the first line 21. After the second line 31 is extended from the inside to the outside of the first line 21 by folding, the third connecting portion 32 and the first connecting portion 22 are located outside the first line 21. (Refer to...) Figure 2 As shown, the first line 21 is spirally formed into an irregular shape, wherein the first line 21 includes at least one recessed section 211. The recessed area of ​​the recessed section 211 is used to accommodate the first connecting part 22 and the third connecting part 32. The irregular shape of the first line 21 will be described in detail later.

[0035] In some embodiments, refer to Figure 3 As shown, the isolation layer 40 further includes at least two insulating layers 42, and a shielding layer 41 is disposed between the two insulating layers 42. The shielding layer 41 and the insulating layer 42 can form a "sandwich" structure. The shielding layer 41 is disposed between the two insulating layers 42, and the insulating layer 42 is used to isolate the shielding layer 41 from the first line 21, the shielding layer 41 from the second line 31. Preferably, at least one of the insulating layers 42 is an adhesive layer; preferably, at least one of the insulating layers 42 is a rubber layer. For example, the insulating layer 42 includes an adhesive layer and a rubber layer. The adhesive layer can be disposed near the first line 21 or the second line 31, and the rubber layer is disposed on the side away from the adhesive layer. Since both the adhesive layer and the rubber layer have insulating properties, either layer can be disposed near the first line 21. The isolation layer 40 can be glued and fixed between the first line 21 and the second line 31 through the adhesive layer.

[0036] In some embodiments, the insulating layer 42 is an adhesive layer, consisting of two layers, with the shielding layer 41 disposed between the two adhesive layers. The adhesive layers can simultaneously bond the first line 21 and the second line 31, and also fix the insulating layer 40 between them. Preferably, the length of the adhesive layer is greater than the width of the first line 21 in the direction from the inside to the outside; preferably, the length of the adhesive layer is less than the length of the second line 31 in the direction from the inside to the outside. When the second line 31 is folded, due to partial overlap, the adhesive layer's length being greater than the width of the first line 21 in the direction from the inside to the outside provides insulation between the first line 21 and the second line 31, while the adhesive layer's length being less than the length of the second line 31 prevents it from interfering with the folding effect of the second line 31.

[0037] In some embodiments, the shielding layer 41 is a metal layer, and metal materials can provide better shielding for electrical signals compared to organic or inorganic materials. Preferably, the shielding layer 41 is connected to a fixed potential; preferably, the shielding layer 41 is grounded.

[0038] In some embodiments, refer to Figure 2 and Figure 4 As shown, where Figure 2 This is a schematic diagram of the folded structure of an NFC device according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an NFC device before folding, according to an embodiment of the present invention. Figure 2 As shown, the first line 21 has an irregular shape, with a portion of the first line 21 recessed inward to form a recessed section 211. The second connecting portion 23 is located inside the first line 21 and extends at least along the recessed section 211. The first connecting portion 22 and the third connecting portion 32 are both located within the recessed area of ​​the recessed section 211. A portion of the first line 21 may also form steps, etc. Only the recessed section 211 is described here; other irregular shapes are selected according to the actual situation. For example... Figure 4 As shown, the recessed section 211 includes a first line segment 2111, a second line segment 2112, and a third line segment 2113. The first line segment 2111 and the second line segment 2112 extend inward in the radial direction, and the first line segment 2111 and the second line segment 2112 are spaced apart. The third line segment 2113 connects the first line segment 2111 and the second line segment 2112. Because the recessed section 211 is recessed inward, it can form a recessed area for setting the first connecting part 22 and the second connecting part 23, which saves space compared to the positive direction coil. On the other hand, the recessed section 211 can be set inside the first line 21 to save the space occupied by the first line 21. Therefore, the above design can reduce the space occupied by the main line 20 and improve the space utilization rate of the main line 20.

[0039] In some embodiments, the first connecting portion 22 and the third connecting portion 32 are both arranged along the direction of the first line segment 2111; or, the first connecting portion 22 and the third connecting portion 32 are both arranged along the direction of the second line segment 2112; or, the first connecting portion 22 and the third connecting portion 32 are both arranged along the direction of the third line segment 2113. (Refer to...) Figure 2 As shown, Figure 2 The first connecting part 22 and the third connecting part 32 are both arranged along the direction of the second line segment 2112, the first connecting part 22 and the third connecting part 32 are both arranged along the direction of the third line segment 2113, and the first connecting part 22 and the third connecting part 32 are both arranged along the direction of the first line segment 2111. This can be determined according to... Figure 2 The example is formed by folding. Preferably, the first connecting portion 22 and the third connecting portion 32 are spaced apart to ensure insulation between them. The extension directions of the first connecting portion 22 and the third connecting portion 32 are selected according to the actual situation. Specifically, the end of the first connecting portion 22 away from the first line 21 and the end of the third connecting portion 32 away from the curved line segment are located on the same side; or, the end of the first connecting portion 22 away from the first line 21 and the end of the third connecting portion 32 away from the curved line segment are located on corresponding sides. Preferably, the end of the first connecting portion 22 away from the first line 21 and the end of the third connecting portion 32 away from the curved line segment are located on the same side.

[0040] In some embodiments, refer to Figure 4 As shown, the second line 31 is bent so that a portion of the second line 31 extends from the inside of the first line 21 to the outside of the first line 21; refer to Figure 5 As shown, a portion of the circuit board 10 can also be bent to form a folded plate 12 on the circuit board 10. The folded plate 12 and the second line 31 are bent simultaneously, so that a portion of the second line 31 extends from the inside of the first line 21 to the outside of the first line 21.

[0041] In some embodiments, refer to Figure 4 and Figure 5As shown, the second line 31 is a curved line, which connects to the second connecting part 23. The curved line extends at an angle to the recessed section 211. The third connecting part 32 is connected to the side of the curved line away from the second connecting part 23. Part of the curved line extends from the inside of the recessed section 211 to the outside of the recessed section 211, and the third connecting part 32 is located within the recessed area. Preferably, part of the curved line extends from the inside of the first line segment 2111 to the outside of the first line segment 2111. Preferably, part of the curved line extends from the inside of the second line segment 2112 to the outside of the second line segment 2112. Preferably, part of the curved line extends from the inside of the third line segment 2113 to the outside of the third line segment 2113. Specifically, a portion of the curved line extends from the inside of the second line segment 2112 to the outside of the second line segment 2112. The curved line includes a first curved section 311, a first straight section 312, a second curved section 313, and a second straight section 314 connected in sequence. The first curved section 311 connects to the second connecting part 23 and extends towards the inside of the recessed section 211. The first curved section 311 has a first included angle. The second curved section 313 extends in a direction away from the first curved section 311 and has a second included angle. The first included angle is equal to the second included angle, and both the first included angle and the second included angle are 90°.

[0042] In some embodiments, refer to Figure 5 As shown, the circuit board 10 includes a main board 11 and a folding plate 12. The folding plate 12 is located inside the first line 21 and connected to the main board 11. The folding plate 12 includes a first folded portion 121, a bent portion 122, and a second folded portion 123. The first folded portion 121, the bent portion 122, and the second folded portion 123 are all spaced apart from the main board 11. The first folded portion 121 is connected to the main board 11, and the bent portion 122 is located between the first folded portion 121 and the second folded portion 123. Preferably, the first folded portion 121, the bent portion 122, and the second folded portion 123 are respectively corresponding to the second line 31. Specifically, the first folded portion 121 is corresponding to the first straight segment 312; or, the bent portion 122 is corresponding to the second bent segment 313; or, the second folded portion 123 is corresponding to the second straight segment 314.

[0043] In some embodiments, refer to Figures 2 to 5 As shown, the third connecting portion 32 and the first connecting portion 22 are located on the same plane; preferably, the third connecting portion 32 and the first connecting portion are located on the same side of the circuit board 10. After the third connecting portion 32 extends to the recessed area of ​​the recessed section 211, it bends toward one side of the circuit board 10 and fits tightly against the side of the circuit board 10, which can increase the stability of the third connecting portion 32.

[0044] In this application, the second line 31 is extended from the inside to the outside of the first line 21 by folding, thereby placing the third connecting portion 32 outside the first line 21. Simultaneously, the first connecting portion 22 and the second connecting portion 23 are welded outside the first line 21. An isolation layer 40 between the first line 21 and the second line 31 prevents short circuits between them, and a shielding layer 41 within the isolation layer 40 isolates electromagnetic interference between the first line 21 and the second line 31. This improves the performance stability of the NFC antenna device and reduces its manufacturing cost. Furthermore, the first line 21 is designed with an irregular shape. The recessed section 211, being recessed inwards, forms a recessed area for the first connecting portion 22 and the second connecting portion 23, saving space compared to a forward coil. Furthermore, the recessed section 211 is placed inside the first line 21, saving space occupied by the first line 21. Therefore, this design reduces the space occupied by the main line 20 and improves its space utilization.

[0045] This application also provides an electronic device including the above-described NFC antenna device.

[0046] In this application, unless otherwise expressly specified and limited, the terms "set up (provided)" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In the description of this specification, references to terms such as "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment is included in at least one embodiment of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0048] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. An NFC antenna device, characterized in that, include: Circuit board; The main circuit includes a first circuit, a first connecting part and a second connecting part disposed on the same side of the circuit board. The first circuit is arranged around the circuit from the inside to the outside. The first connecting part is disposed on the outside of the first circuit and the second connecting part is disposed on the inside of the first circuit. A folded circuit is located on the same side of the circuit board as the main circuit. The folded circuit includes a second circuit and a third connecting portion. The second circuit is connected to the second connecting portion, and the third connecting portion is connected to the side of the second circuit away from the second connecting portion. A portion of the second circuit extends from the inside of the first circuit to the outside of the first circuit, and the third connecting portion is located outside the first circuit. An isolation layer is disposed between the first line and the second line, and the isolation layer includes at least a shielding layer for isolating electromagnetic interference between the first line and the second line.

2. The NFC antenna device according to claim 1, characterized in that, The isolation layer further includes at least two insulating layers, and the shielding layer is disposed between the two insulating layers; Preferably, at least one of the insulating layers is an adhesive layer; Preferably, at least one of the insulating layers is a rubber layer.

3. The NFC antenna device according to claim 2, characterized in that, All insulating layers are adhesive layers; Preferably, the length of the adhesive layer is greater than the width of the first line in the direction from the inside to the outside. Preferably, the length of the adhesive layer is less than the length of the second line in the direction from the inside to the outside of the first line.

4. The NFC antenna device according to claim 1, characterized in that, The shielding layer is a metal layer; Preferably, the shielding layer is connected to a fixed potential; Preferably, the shielding layer is grounded.

5. The NFC antenna device according to claim 1, characterized in that, A portion of the first line is recessed inward to form a recessed section, and the second connecting part is located inside the first line. The second connecting part extends at least along the recessed section, and both the first connecting part and the third connecting part are located within the recessed area of ​​the recessed section. Preferably, the recessed section includes a first line segment, a second line segment, and a third line segment. The first line segment and the second line segment extend inward in the radial direction and are spaced apart. The third line segment connects the first line segment and the second line segment.

6. The NFC antenna device according to claim 5, characterized in that, Both the first connecting portion and the third connecting portion are arranged along the direction of the first line segment; or, both the first connecting portion and the third connecting portion are arranged along the direction of the second line segment; or, both the first connecting portion and the third connecting portion are arranged along the direction of the third line segment. Preferably, the first connecting portion and the third connecting portion are spaced apart.

7. The NFC antenna device according to claim 5, characterized in that, The second line is a curved line, which connects to the second connecting part. The curved line extends at an angle to the recessed section. The third connecting part is connected to the side of the curved line away from the second connecting part. Part of the curved line extends from the inside of the recessed section to the outside of the recessed section, and the third connecting part is located within the recessed area. Preferably, a portion of the curved line extends from the inside of the first line segment to the outside of the first line segment; Preferably, a portion of the curved line extends from the inside of the second line segment to the outside of the second line segment; Preferably, a portion of the curved line extends from the inside of the third line segment to the outside of the third line segment.

8. The NFC antenna device according to claim 1, characterized in that, The circuit board includes a main board and a folding board. The folding board is located inside the first line and connected to the main board. The folding board includes a first folding part, a bent part, and a second folding part. The first folding part, the bent part, and the second folding part are all spaced apart from the main board. The first folding part is connected to the main board, and the bent part is located between the first folding part and the second folding part. Preferably, the first folded portion, the bent portion, and the second folded portion are respectively provided corresponding to the second line.

9. The NFC antenna device according to claim 1, characterized in that, The third connecting part and the first connecting part are located on the same plane; Preferably, the third connecting portion and the first connecting portion are located on the same side of the circuit board.

10. An electronic device, characterized in that, Includes the NFC antenna device according to any one of claims 1 to 9.

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