Antenna device and electronic device

Abstract

The present invention relates to an antenna device and an electronic device. In the antenna device, the near-field communication unit includes a first signal terminal and a second signal terminal, and the near-field communication unit is used to provide an excitation current; the first radiator is provided with a first feeding point and a first grounding point, and the first feeding point is used to feed in the excitation current and a first feeding current provided by a non-near-field communication unit; the second radiator is provided with a second feeding point connected to the second signal terminal and a second grounding point grounded; the first tuning unit is connected in series between the first feeding point of the first radiator and the first signal terminal, and the first tuning unit is used to transmit the excitation current at the operating frequency point of the near-field communication unit and block the first feeding current; wherein, the first radiator and the second radiator jointly radiate a near-field communication signal under the excitation of the excitation current; the first radiator is further used to radiate a first preset radio frequency signal under the excitation of the first feeding current, with small size, good communication performance and low cost.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and particularly to an antenna device and an electronic device. Background Art

[0002] The application of Near Field Communication (NFC) in electronic devices is becoming increasingly widespread, and it is applied in multiple scenarios such as subway gate entry and access card swiping.

[0003] Moreover, electronic devices are developing towards a smaller and smaller size, resulting in less and less layout space left for near field communication antennas on the electronic devices. Based on this, the miniaturization design of near field communication antennas has become an urgent problem to be solved. Summary of the Invention

[0004] Embodiments of the present application provide an antenna device and an electronic device, which can achieve the miniaturization design of the antenna and the device.

[0005] An antenna device includes:

[0006] A near field communication unit, including a first signal terminal and a second signal terminal, and the near field communication unit is used to provide an excitation current;

[0007] A first radiator, the first radiator is provided with a first feeding point and a first grounding point, and the first feeding point is used to feed in the excitation current and a first feeding current provided by a non-near field communication unit;

[0008] A second radiator, the second radiator is provided with a second feeding point connected to the second signal terminal, and a second grounding point grounded;

[0009] A first tuning unit, the first tuning unit is connected in series between the first feeding point of the first radiator and the first signal terminal, and the first tuning unit is used to transmit the excitation current at the operating frequency point of the near field communication unit and block the first feeding current;

[0010] Wherein, the first radiator and the second radiator jointly radiate a near field communication signal under the excitation of the excitation current; the first radiator is further used to radiate a first preset radio frequency signal under the excitation of the first feeding current.

[0011] An electronic device includes: the antenna device as described above.

[0012] The above antenna device and electronic device have at least the following beneficial effects:

[0013] In the antenna device, the first radiator is connected to the first signal terminal of the near-field communication unit through the first tuning unit, the second signal terminal of the near-field communication unit is connected to the second radiator. Based on the tuning characteristics of the first tuning unit, the first radiator transmits the excitation current at the operating frequency point of the near-field communication unit and blocks the first feeding current provided by the non-near-field communication unit. At this time, the first radiator and the second radiator share the radiation of the near-field communication signal under the excitation of the excitation current. The first radiator is also used to radiate the first preset radio frequency signal under the excitation of the first feeding current, realizing the multiplexing of the first radiator, which is beneficial to the miniaturization design. In addition, based on the setting of the first tuning unit, the near-field communication unit and the non-near-field communication unit share the first feeding point and the first grounding point, which is beneficial to maximizing the reuse of the size of the first radiator and further beneficial to the miniaturization design of the antenna device. Brief Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 One of the schematic structural diagrams of the antenna device in an embodiment;

[0016] Figure 2 Another schematic structural diagram of the antenna device in an embodiment;

[0017] Figure 3 Another schematic structural diagram of the antenna device in an embodiment;

[0018] Figure 4 Another schematic structural diagram of the antenna device in an embodiment;

[0019] Figure 5 Another schematic structural diagram of the antenna device in an embodiment. Detailed Description of the Embodiments

[0020] To facilitate the understanding of the present application, the following will describe the present application more comprehensively with reference to the relevant drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0022] It can be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, the first radiator may be referred to as the second radiator, and similarly, the second radiator may be referred to as the first radiator. Both the first radiator and the second radiator are radiators, but they are not the same radiator.

[0023] It can be understood that for "connection" in the following embodiments, if there is a transfer of electrical signals or data between the connected circuits, modules, units, etc., it should be understood as "electrical connection", "communication connection", etc.

[0024] As Figures 1-5 shown, in one of the embodiments, an antenna device provided by an embodiment of this application includes: a near field communication unit 20, a first radiator 40, a second radiator 60, and a first tuning unit 80.

[0025] In this embodiment, the near field communication unit 20 (Near Field Communication, NFC) includes a first signal terminal TX1 and a second signal terminal TX2. The near field communication unit 20 is used to provide an excitation current to realize the radiation of NFC signals (near field communication signals) on the transmission path of the excitation current. The near field communication unit 20 can adopt a dual-terminal feeding method, and the excitation current is fed in and out through the second signal terminal TX2 and the first signal terminal TX1 as shown in the figure. The near field communication unit 20 is used to provide a differential excitation current. Compared with single-terminal communication, in the case of the same interference, the dual-terminal communication method can subtract the same interference signal based on the difference, thereby improving the anti-interference performance of the excitation current and further improving the stability of NFC communication.

[0026] The first radiator 40 is provided with a first feeding point K1 and a first grounding point GND1. The first feeding point K1 is used to feed in the excitation current and the first feeding current provided by a non-near field communication unit (not shown). The non-near field communication unit and the near field communication unit 20 share the first feeding point K1 and the first grounding point GND1 to realize the co-point feeding of near field signals and non-near field signals, which can maximize the reuse of the size of the first radiator 40, is beneficial to improving the reuse rate of the first radiator 40, and thus is beneficial to the miniaturized design of the antenna device.

[0027] The second radiator 60 is provided with a second feeding point K2 connected to the second signal terminal TX2 and a second grounding point GND2 grounded. The first grounding point GND1 and the second grounding point GND2 can be realized on the same grounding plane. The first radiator 40 and the second radiator 60 can be realized by printed lines of FPC (Flexible Printed Circuit) or PCB (Printed circuit boards) or LDS (Laser-Direct-structuring) metal, or a combination of the above methods. In addition, the first radiator 40 and the second radiator 60 can also be made of new materials with the same metal radiation performance. The feeding point in the embodiment of the present application can be a contact feeding point or a coupling feeding point.

[0028] The first tuning unit 80 is connected in series between the first feeding point K1 of the first radiator 40 and the first signal terminal TX1. The first tuning unit 80 is used to transmit an excitation current at the operating frequency point of the near-field communication unit 20 and block the first feeding current. The first radiator 40 and the second radiator 60 jointly radiate a near-field communication signal under the excitation of the excitation current; the first radiator 40 is also used to radiate a first preset radio frequency signal under the excitation of the first feeding current, realizing the multiplexing of the first radiator 40. Under the adaptation selection of the first tuning unit 80, the first radiator 40 can radiate a near-field communication signal and a first preset radio frequency signal without interference, and there is no need to introduce a control device to control the multiplexing process of the first radiator 40, with low cost.

[0029] Among them, the non-near-field communication unit can be an IC and can be integrated on the circuit board of the electronic device. Based on the type of the first preset radio frequency signal, the non-near-field communication unit can be a chip matching it. For example, corresponding to a cellular network signal, the non-near-field communication unit can be a cellular communication chip for providing the cellular network signal. When the first preset radio frequency signal is a GPS signal, the non-near-field communication unit can be a GPS chip. When the first preset radio frequency signal is a WiFi signal, the non-near-field communication unit can be a WiFi chip. When the first preset radio frequency signal is a BT signal, the non-near-field communication unit can be a BT chip. The non-near-field communication unit can also include multiple chips for providing different feeding currents to excite the radiator to radiate different preset radio frequency signals. The first radiator 40 can be used for radiating the above first preset radio frequency signals, for example, a WiFi signal operating in the 5GHz band, or a WiFi signal in the 2.4GHz band.

[0030] The antenna device provided by the embodiment of the present application, the first radiator 40 is connected to the first signal terminal TX1 of the near-field communication unit 20 through the first tuning unit 80, the second signal terminal TX2 of the near-field communication unit 20 is connected to the second radiator 60. Based on the tuning characteristics of the first tuning unit 80, the first radiator 40 transmits the excitation current at the operating frequency point of the near-field communication unit 20 and blocks the first feeding current provided by the non-near-field communication unit. For reference, see Figure 1 the schematic diagram of the transmission of the excitation current in

[0031] In one embodiment, at least part of the first magnetic field generated by the first radiator 40 under the excitation of the excitation current overlaps with the second magnetic field generated by the second radiator 60 under the excitation of the excitation current. The positional relationship between the first radiator 40 and the second radiator 60 is based on the principle that at least part of the magnetic fields generated by them under the excitation of the excitation current overlap. At this time, not only can the near-field communication range be increased, but also based on the magnetic field superposition, the magnetic field can be enhanced, the near-field communication ability can be improved, and further the size requirements for the first radiator 40 and the second radiator 60 can be reduced, which is beneficial to the miniaturization design. At the same time, the mutual strengthening between the two magnetic fields can also be realized, and the positions of the first radiator 40 and the second radiator 60 are set concentratedly, further saving the occupied space of the antenna device. That is, the solution provided by the embodiment of the present application is beneficial to improving the near-field communication performance and miniaturization design.

[0032] In one embodiment, the second radiator 60 includes a first sub-radiator 62. The second feeding point K2 is disposed at one end of the first sub-radiator 62 close to the first radiator 40. When the first radiator 40 and the first sub-radiator 62 are arranged close to each other, the superposition effect between the magnetic fields generated by the first radiator 40 and the first sub-radiator 62 under the excitation of the excitation current is better, which is beneficial to the realization of a small-size antenna device. The better the magnetic field coupling, the higher the efficiency. Therefore, the extending direction of the first radiator 40 from the first grounding point GND1 to the first feeding point K1 and the extending direction of the first sub-radiator 62 from one end away from the first radiator 40 to the second feeding point K2 form a first included angle θ1, and the first included angle θ1 is greater than or equal to 60° and less than or equal to 90°. Within this range of the first included angle θ1, the magnetic field superposition effect is good, and within this range, the angle can be actually adjusted based on the spatial design requirements of the electronic product equipped with this antenna device.

[0033] In one embodiment, the first included angle θ1 is 90°. When the extending direction of the first radiator 40 from the first grounding point GND1 to the first feeding point K1 and the extending direction of the first sub-radiator 62 from one end away from the first radiator 40 to the second feeding point K2 form a 90° angle, based on the right-hand rule, the magnetic field coupling effect between the first radiator 40 and the first sub-radiator 62 generated under the excitation of the excitation current is the best. Under the same communication range design requirements, the sizes of the first radiator 40 and the first sub-radiator 62 designed based on the 90° first included angle θ1 are smaller than those designed with other first included angles θ1, which is beneficial to the miniaturization design of the antenna device.

[0034] In one embodiment, the extending length of the first sub-radiator 62 in the extending direction from one end away from the first radiator 40 to the second feeding point K2 is greater than or equal to 20 mm. The width of the first sub-radiator 62 in the direction perpendicular to the extending direction is greater than or equal to 6 mm. According to tests, the first sub-radiator 62 under this size constraint can cooperate with first radiators 40 of various sizes to achieve good near-field communication. The size selection of the first sub-radiator 62 can be based on the size of the first radiator 40 it is paired with. The size of the first radiator 40 is also related to the frequency band of the first preset radio frequency signal. The higher the frequency band of the first preset radio frequency signal, the smaller the size requirement for the first radiator 40. On the contrary, the lower the frequency band of the first preset radio frequency signal, the larger the size requirement for the first radiator 40. In actual application, the sizes of the first radiator 40 and the first sub-radiator 62 can be determined based on the communication frequency band design requirements of the antenna device.

[0035] In one embodiment, as Figures 2-4As shown, the second radiator 60 further includes: a second sub-radiator 64. The first end of the second sub-radiator 64 is connected to the end of the first sub-radiator 62 on the side away from the first radiator 40, and the second end of the second sub-radiator 64 is grounded. Through this connection, all the dimensions of the second sub-radiator 64 and the first sub-radiator 62 are used for the radiation of near-field communication signals, which is beneficial to improving the efficiency of the second radiator 60 and thus beneficial to miniaturization design. Among them, the second end of the second sub-radiator 64 is connected to the second ground point GND2 to achieve grounding.

[0036] In one embodiment, the extension length of the second sub-radiator 64 in the extension direction from the second ground point GND2 to the end of the first sub-radiator 62 on the side away from the first radiator 40 is greater than or equal to 40 mm. The width of the second sub-radiator 64 in the direction perpendicular to the extension direction is greater than or equal to 4 mm. According to tests, the second sub-radiator 64 under this size constraint, in cooperation with the first sub-radiator 62, realizes good near-field communication. Similar to the size design principle of the first sub-radiator 62, in actual application, the size of the second sub-radiator 64 can be determined based on the communication frequency band design requirements of the antenna device.

[0037] In one embodiment, the second sub-radiator 64 and the first radiator 40 are located on the same side of the first sub-radiator 62. The same-side arrangement can not only save layout space, which is beneficial to miniaturization design, but also is beneficial to the coupling between the magnetic fields generated by the first radiator 40 and the second sub-radiator 64 respectively under the excitation of the excitation current, thereby improving the communication performance.

[0038] In one embodiment, the extension direction of the second sub-radiator 64 from the second ground point GND2 to the end of the first sub-radiator 62 on the side away from the first radiator 40 is set at a second angle θ2 with the extension direction of the first sub-radiator 62 from the end on the side away from the first radiator 40 to the second feeding point K2, and the second angle θ2 is greater than or equal to 60° and less than or equal to 90°. Within this range of the second angle θ2, the magnetic field superposition effect generated by the first sub-radiator 62 and the second sub-radiator 64 during near-field communication is good. Within this range, based on the space design requirements of the electronic product equipped with this antenna device, this angle can be actually adjusted. Here, the second angle θ2 should be understood as the acute angle or right angle formed by the extension directions of the first sub-radiator 64 and the first sub-radiator 62 when they are arranged close to each other, and this acute angle is greater than or equal to 60° and less than 90°. At this time, the vector angle between the extension direction of the second sub-radiator 64 from the second ground point GND2 to the end of the first sub-radiator 62 on the side away from the first radiator 40 and the extension direction of the first sub-radiator 62 from the end on the side away from the first radiator 40 to the second feeding point K2 is constrained between 90° - 120°.

[0039] In one embodiment, the second included angle θ2 is 90°. When both the first sub-radiating portion 62 and the second sub-radiating portion 64 are linear radiators, the first sub-radiating portion 62 and the second sub-radiating portion 64 are perpendicular, and the magnetic field coupling effect generated during near-field communication is optimal.

[0040] In one embodiment, as Figures 3-5 shown, the antenna device further includes: a third radiator 100. One end of the third radiator 100 is connected to the end of the first radiator 40 on the side away from the first tuning unit 80. Among them, the first radiator 40, the second radiator 60, and the third radiator 100 jointly radiate near-field communication signals under the excitation of the excitation current. As Figures 3-5 shown, the excitation current provided by the near-field communication unit 20 is fed into the first tuning unit 80 from the first signal terminal TX1, and through the first tuning unit 80, it is fed into the first radiator 40 from the first feeding point K1. After passing through the first radiator 40, it is fed into the third radiator 100 and flows into the ground via the third radiator 100. Then, the excitation current I is fed into the second radiator 60 from the first grounding point GND1. After flowing through the second radiator 60, it is fed into the second signal terminal TX2 of the near-field communication unit 20 from the second signal terminal TX2. The first radiator 40, the second radiator 60, and the third radiator 100 jointly form a transmission path for the excitation current I, and jointly act on the radiation of the near-field communication signal. The addition of the third radiator 100 expands the near-field communication range and further improves the near-field communication performance. When the third radiator 100 is provided, a tuning unit can be connected in series between the first grounding point GND1 and the first radiator 40. This tuning unit can block the near excitation current and transmit the first feeding current so that the excitation current can flow through the third radiator 100.

[0041] Among them, the third radiator 100 can be realized by an FPC (Flexible Printed Circuit) or a PCB (Printed circuit boards) printed line or an LDS (Laser-Direct-structuring) metal, or a combination of the above several methods. In addition, the third radiator 100 can also be made of a new material with the same metal radiation performance. The third radiator 100 and the first radiator 40 can perform signal transmission in a gap coupling manner.

[0042] In one embodiment, the third radiator 100 is arranged such that the extension direction F4 from the end not connected to the first radiator 40 to the end connected to the first radiator 40 forms a third angle θ3 with the extension direction F1 of the first radiator 40 from the first ground point GND1 to the first feeding point K1. The third angle θ3 is greater than or equal to 60° and less than or equal to 90°. Within this second angle θ2 range, the magnetic field superposition effect generated by the third radiator 100 and the first radiator 40 during near-field communication is good. Within this range, the angle can be actually adjusted based on the spatial design requirements of the electronic product equipped with this antenna device. The third angle θ3 here should be understood as the acute angle or right angle formed by the extension directions of the first radiator 40 and the third radiator 100 when they are arranged close to each other, and this acute angle is greater than or equal to 60° and less than 90° (as Figure 4 shown). At this time, the vector angle between the extension direction of the third radiator 100 from the end not connected to the first radiator 40 to the end connected to the first radiator 40 and the extension direction of the first radiator 40 from the first ground point GND1 to the first feeding point K1 is constrained between 90° and 120°.

[0043] When the third radiator 100 is not used for radiating other non-near-field communication signals except the first preset radio frequency signal, the third radiator 100 can be directly connected to the first radiator 40 to expand the communication range. For example, by directly electrically connecting the third radiator 100 and the first radiator 40, a conductive path is added to increase the radiation path length of near-field communication. At this time, with the size of the second radiator 60 unchanged, based on the series connection of the first radiator 40 and the third radiator 100, the communication range is expanded and the communication performance is improved. Adaptively, since the third radiator 100 also generates a self-inductance value when radiating near-field communication signals, at this time, the second inductance value of the first tuning unit 80 can be appropriately reduced to reduce the loss of the inductor device and further improve the performance.

[0044] In one embodiment, the third radiator 100 is also used to support the radiation of the second preset radio frequency signal. The third radiator 100 is provided with a third feeding point K3 and a third ground point GND3. The third feeding point K3 is used to feed the exciting current and the second feeding current provided by the non-near-field communication unit. The third radiator 100 is also used to radiate the second preset radio frequency signal under the excitation of the second feeding current. Since the third feeding point K3 is also used to feed the second feeding current, to avoid interference when the third radiator 100 is multiplexed as the antenna for radiating the second preset radio frequency signal and the near-field communication antenna, this antenna device further includes: a second tuning unit 120.

[0045] The second tuning unit 120 is connected in series between the first end of the second radiator 60 and the second end of the first radiator 40, and the second tuning unit 120 is configured to transmit an excitation current at the operating frequency point of the near-field communication unit 20 and block the first feeding current and the second feeding current. This can not only avoid interference between the second preset radio frequency signal and the near-field communication signal, but also avoid interference between the first preset radio frequency signal and the second preset radio frequency signal, thereby realizing multiplexing of each radiator while ensuring good communication performance.

[0046] In one embodiment, the third feeding point K3 is provided at one end of the third radiator 100 close to the first radiator 40, and the third grounding point GND3 is provided at the other end of the third radiator 100 away from the first radiator 40. This can achieve the maximum multiplexing of the size of the third radiator 100, which is beneficial to miniaturized design.

[0047] Each tuning unit in the embodiments of the present application can also be a tuning circuit, a tuning network, a matching network, etc. The tuning unit in the embodiments of the present application can include a capacitor, a resistor, an inductor, and any combination thereof. The parameters of the tuning unit can be determined according to the preset resonance frequency points of various preset radio frequency signals and the size of the antenna radiator required to transmit the preset radio frequency signal.

[0048] In one embodiment, the inductance value of the first radiator 40 when transmitting the excitation current is the first inductance value; the inductance value of the first tuning unit 80 when transmitting the excitation current is the second inductance value; the inductance value of the second radiator 60 when transmitting the excitation current is the third inductance value; the ratio of the sum of the first inductance value and the second inductance value to the third inductance value is greater than or equal to 0.5 and less than or equal to 1. To ensure good communication performance, the inductance amounts accessed at both ends of the near-field communication signal should not differ much. After testing, when the ratio of the sum of the first inductance value and the second inductance value to the third inductance value is greater than or equal to 0.5 and less than or equal to 1, better communication performance can be guaranteed. The inductance value can be understood as the self-inductance value.

[0049] In one embodiment, the inductance value of the third radiator 100 when transmitting the excitation current is the fourth inductance value, then the ratio of the sum of the first inductance value, the second inductance value, and the fourth inductance value to the third inductance value is greater than or equal to 0.5 and less than or equal to 1. In the setting mode with the third radiator 100, by controlling the ratio of the inductance values at both ends of the near-field communication unit 20 to be between 0.5 and 1, it is beneficial to maintain good communication performance.

[0050] In one embodiment, the ratio of the sum of the first inductance value and the second inductance value to the third inductance value is 1. The closer the ratio is to 1, the more stable the differential signal at both ends of the near-field communication unit 20 is. At this time, the communication efficiency of the antenna device is the highest and the performance is the best.

[0051] In one embodiment, the first radiator 40 and the second radiator 60 are arranged on the same side of the near-field communication unit 20. At this time, it is more conducive to the coupling between the magnetic fields generated by the first radiator 40 and the second radiator 60 respectively under the excitation of the excitation current, and is conducive to improving the space utilization rate and the compactness of the antenna structure layout, so as to realize the improvement of the near-field communication performance and the miniaturization design.

[0052] In one embodiment, the first radiator 40, the second radiator 60 and the third radiator 100 are all arranged on the same side of the near-field communication unit 20. At this time, it is more conducive to the coupling between the magnetic fields generated by each radiator respectively under the excitation of the excitation current, and is conducive to improving the space utilization rate and the compactness of the antenna structure layout, so as to realize the improvement of the near-field communication performance and the miniaturization design.

[0053] In one embodiment, the first tuning unit 80 can be an inductor L1. When the first tuning unit 80 is an inductor, it can not only improve the Q value (quality factor) of the antenna device, but also serve as an isolation device to avoid interference when the first radiator 40 is multiplexed as a near-field communication antenna and a non-near-field communication antenna.

[0054] In one embodiment, the second tuning unit 120 can be selected as an inductor L2. It can further improve the Q value (quality factor) of the antenna device, and can also serve as an isolation device to avoid interference when the second radiator 60 is multiplexed as a near-field communication antenna and a non-near-field communication antenna.

[0055] In one embodiment, the first radiator 40, the first sub-radiator 62, the second sub-radiator 64 and the third radiator 100 are all linear radiators. The antenna device can be a card antenna.

[0056] In one embodiment, the first radiator 40 is a metal frame, and the second radiator 60 is a flexible circuit board. The second radiator 60 can be used as the main radiator for radiating near-field communication signals, and the first radiator 40 is mainly used to expand the communication range of near-field communication. With this selection and combination, based on the characteristics of flexible FPC wiring and easy effective use of space dimensions, under the condition of meeting the near-field communication requirements, it can cooperate with various sizes of the first radiator 40 to expand the near-field communication range. Taking the first radiator 40 as a cellular antenna, for the antenna device provided by the embodiment of the present application, by reasonably setting the wiring length and wiring direction of the second radiator 60, it can cooperate with the cellular antenna on any product to improve the near-field communication performance. The second radiator 60 can be a flexible circuit board dedicated to near-field communication.

[0057] In the embodiments of the present application, the FPC can be a one-line multi-beam structure with a hollow in the middle, so as to improve the Q value (quality factor) of the FPC. At the same time, considering that this structural design will increase the internal resistance loss, the balance point between the quality factor and the internal resistance loss can be determined based on the design requirements, and then the specific structural parameters of the FPC can be determined. An FPC meeting this requirement can be selected as the second radiator 60.

[0058] In one of the embodiments, if the size of the second radiator 60 is long enough and the signal radiation environment is good, the size of the first radiator 40 and the frequency band for radiating the first preset radio frequency signal can be arbitrarily selected. For example, it can be from GSM (Global System for Mobile Communications) 900 to 5G Wi-Fi (802.11ac). It can be seen that the antenna device provided by the embodiments of the present application can be widely applied to electronic devices with first radiators 40 of various sizes.

[0059] The longer the length of the first radiator 40, the larger the magnetic field coverage range, the better the coupling effect with the second radiator 60, and the farther the near-field communication distance. In one of the embodiments, the length of the first radiator 40 is greater than or equal to 8.5 mm. At this time, the coupling effect is good and the communication performance is good. Optionally, the length of the first radiator 40 is greater than or equal to 10 mm.

[0060] In the embodiments of the present application, the electrical connection between each part can also be realized by means of conductors, flexible printed circuit boards, etc.

[0061] In one of the embodiments, the embodiments of the present application provide an electronic device including the above antenna device. The electronic device can be a smart phone, a tablet computer, etc., and can also be a wearable device, a game device, an augmented reality (AR) device, an automotive device, a data storage device, an audio playback device, a video playback device, a laptop computer, a desktop computing device, etc. Wearable devices include but are not limited to smart watches, smart bracelets, etc. For example, a smart watch with a call function, a smart watch without a call function and a sports watch, and a bracelet with an NFC function, etc.

[0062] In one embodiment, the first radiator 40 may be a metal frame of the middle plate of the electronic device. One side of the middle plate is metal, forming a metal area. When other electronic components on the electronic device transmit alternating current, high-frequency interference signals will be generated in the metal area, interfering with the above-mentioned excitation current. Based on this, the electronic device further includes a filter circuit (not shown). The filter circuit establishes an electrical connection between the metal area and the ground. Due to the characteristic of the filter circuit of passing high frequencies and blocking low frequencies, high-frequency interference signals are filtered out without affecting the transmission of near-field communication signals, further improving the communication performance of the electronic device. The filter circuit may include capacitors, inductors, and combinations thereof, etc.

[0063] The electronic device has a circuit board. The grounding points in the above embodiments may be mainly arranged on the surface of the circuit board. The circuit board is also provided with electrical connection devices such as spring feet, screws, spring pieces, conductive cloth, conductive foam, or conductive glue, etc., for establishing the connection between the first radiator 40, the second radiator 60, the third radiator 100, and the near-field communication unit 20, or for establishing the connection between the ground and the filter circuit. In addition, air, plastic, ceramic, or other dielectric materials may be filled between the ground and the components it is connected to.

[0064] In the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", "ideal embodiments", etc. mean that the specific features, structures, materials, or features described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0065] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0066] The above-described embodiments only represent several implementation manners of the present invention. The descriptions are relatively specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. An antenna device, characterized in that, Comprising: A near - field communication unit, including a first signal terminal and a second signal terminal, the near - field communication unit being configured to provide an excitation current; A first radiator, the first radiator having a first feeding point and a first grounding point, the first feeding point being configured to feed in the excitation current and a first feeding current provided by a non - near - field communication unit; A second radiator, the second radiator having a second feeding point connected to the second signal terminal and a second grounding point grounded; A first tuning unit, the first tuning unit being connected in series between the first feeding point of the first radiator and the first signal terminal, the first tuning unit being configured to transmit the excitation current at the operating frequency point of the near - field communication unit and block the first feeding current; Wherein, the first radiator and the second radiator jointly radiate a near - field communication signal under the excitation of the excitation current, the excitation current is fed into the first tuning unit from the first signal terminal of the near - field communication unit, after passing through the first tuning unit, it is fed into the first radiator from the first feeding point, after passing through the first radiator, it flows into the ground from the first grounding point, and is fed into the second radiator from the second grounding point, and after flowing through the second radiator, it is fed into the second signal terminal of the near - field communication unit from the second feeding point; The first radiator is further configured to radiate a first preset radio - frequency signal under the excitation of the first feeding current.

2. The antenna device according to claim 1, wherein The first magnetic field generated by the first radiator under the excitation of the excitation current and the second magnetic field generated by the second radiator under the excitation of the excitation current at least partially overlap.

3. The antenna device according to claim 2, characterized in that, The second radiator includes a first sub - radiator; The second feeding point is arranged at one end of the first sub - radiator close to the first radiator; Wherein, the extending direction of the first radiator from the first grounding point to the first feeding point and the extending direction of the first sub - radiator from one end away from the first radiator to the second feeding point are arranged at a first included angle, and the first included angle is greater than or equal to 60° and less than or equal to 90°.

4. The antenna device according to claim 3, characterized in that, The first included angle is 90°.

5. The antenna device according to claim 3 or 4, characterized in that, The second radiator further includes: A second sub - radiator, a first end of the second sub - radiator is connected to one end of the first sub - radiator away from the first radiator, and a second end of the second sub - radiator is grounded.

6. The antenna device according to claim 5, wherein, The extending direction of the second sub - radiator from the second grounding point to one end of the first sub - radiator away from the first radiator and the extending direction of the first sub - radiator from one end away from the first radiator to the second feeding point are arranged at a second included angle, and the second included angle is greater than or equal to 60° and less than or equal to 90°.

7. The antenna device according to claim 1, characterized in that, Further comprising: A third radiator, one end of the third radiator is connected to one end of the first radiator away from the first tuning unit; Wherein, the first radiator, the second radiator and the third radiator jointly radiate a near - field communication signal under the excitation of the excitation current.

8. The antenna device according to claim 7, wherein, The third radiator is provided with a third feeding point and a third grounding point. The third feeding point is used for feeding in the excitation current and the second feeding current provided by the non-NFC unit. The antenna device further includes: A second tuning unit, which is connected in series between the first end of the second radiator and the second end of the first radiator. The second tuning unit is used for transmitting the excitation current at the operating frequency point of the NFC unit and blocking the first feeding current and the second feeding current. Wherein, the third radiator is further used for radiating a second preset radio frequency signal under the excitation of the second feeding current.

9. The antenna device according to claim 1, wherein The inductance value of the first radiator when transmitting the excitation current is a first inductance value; The inductance value of the first tuning unit when transmitting the excitation current is a second inductance value; The inductance value of the second radiator when transmitting the excitation current is a third inductance value; The ratio of the sum of the first inductance value and the second inductance value to the third inductance value is greater than or equal to 0.5 and less than or equal to 1.

10. The antenna device according to claim 9, characterized in that, The ratio of the sum of the first inductance value and the second inductance value to the third inductance value is 1.

11. The antenna device according to claim 1, characterized in that, The first radiator and the second radiator are arranged on the same side of the NFC unit.

12. The antenna device according to claim 1, characterized in that, The first tuning unit is an inductor.

13. An electronic device, characterized in that, Comprising: The antenna device according to any one of claims 1-12.

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