CN113054406A

CN113054406A - Antenna device and electronic apparatus

Info

Publication number: CN113054406A
Application number: CN201911370482.9A
Authority: CN
Inventors: 李偲
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2021-06-29

Abstract

The embodiment of the application provides an antenna device and electronic equipment, the antenna device includes: the near field communication chip is used for providing differential excitation current; a ground plane formed with a conductive path and a first metal branch; a conductor part; a radiation field enhancer; the conductor part, the conducting path and the first metal branch joint together form a conducting loop for transmitting the differential excitation current, and the radiation field enhancement body is used for enhancing the field intensity of a near field communication radiation field generated when the conductor part transmits the differential excitation current. In the antenna device, the design of the NFC antenna can be realized through different parts of the electronic equipment, so that the occupied space of the NFC antenna can be saved, the layout of the NFC antenna can be more flexible, the radiation field reinforcement body is arranged in the antenna device, the field intensity of the NFC radiation field generated by the conductor part can be enhanced, and the NFC signal intensity and the coverage range of the electronic equipment can be improved.

Description

Antenna device and electronic apparatus

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to an antenna device and an electronic device.

Background

With the development of communication technology, electronic devices such as smart phones have more and more functions, and communication modes of the electronic devices are more diversified. For example, a typical electronic device may support multiple communication modes such as cellular network communication, Wireless Fidelity (Wi-Fi) communication, Global Positioning System (GPS) communication, Bluetooth (BT) communication, and the like. Further, with the advancement of Communication technology, Near Field Communication (NFC) is increasingly available for electronic devices in recent years. It will be appreciated that each communication mode of the electronic device requires a respective antenna to support.

On the other hand, along with the development of electronic technology, electronic devices are increasingly miniaturized and light and thin, and the internal space of the electronic devices is also increasingly small, so that how to reasonably design the NFC antenna of the electronic device becomes a difficult problem.

Disclosure of Invention

The embodiment of the application provides an antenna device and electronic equipment, can save the occupation space of NFC antenna among the electronic equipment, and the overall arrangement of NFC antenna can be more nimble to can improve NFC signal intensity and coverage.

An embodiment of the present application provides an antenna apparatus, including:

the near field communication chip comprises a first differential signal end and a second differential signal end, wherein the first differential signal end and the second differential signal end are used for providing differential excitation current;

the ground plane comprises a first ground part and a second ground part which are arranged at intervals, a conductive path is formed between the first ground part and the second ground part by the ground plane, the first ground part extends to form a first metal branch, and the first metal branch is electrically connected with the first differential signal end;

a conductor portion disposed at an interval from the ground plane, the conductor portion being electrically connected to the second differential signal terminal;

a radiation field enhancer disposed between the conductor portion and the ground plane;

the conductor part, the conducting path and the first metal branch joint together form a conducting loop for transmitting the differential excitation current, and the radiation field enhancer is used for enhancing the field intensity of a near field communication radiation field generated when the conductor part transmits the differential excitation current.

The embodiment of the application further provides an electronic device, which comprises an antenna device, wherein the antenna device is the antenna device.

According to the antenna device provided by the embodiment of the application, the first metal branch and the conductor part are formed on the ground plane, and the conductive path is formed on the ground plane, so that a conductive loop for transmitting the NFC differential excitation current can be formed by the first metal branch, the conductive path and the conductor part together, and the radiation field enhancement body is arranged between the conductor part and the ground plane and can enhance the field intensity of the NFC radiation field generated by the conductor part. Because first metal branch knot can form at the different positions of ground plane according to the demand of electronic equipment inner space design, conductor portion also can set up the different positions at electronic equipment to can realize the design of NFC antenna through electronic equipment's different positions, consequently can save the occupation space of NFC antenna, and the overall arrangement of NFC antenna can be more nimble. In addition, the antenna device is provided with the radiation field enhancement body, so that the field intensity of the NFC radiation field generated by the conductor part can be enhanced, and the NFC signal strength and the coverage range of the electronic equipment can be improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Fig. 2 is a schematic view of a first structure of an antenna device according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a ground plane in the antenna device shown in fig. 2.

Fig. 4 is a schematic diagram of a second structure of an antenna apparatus according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a third antenna device according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a ground plane in the antenna device shown in fig. 5.

Fig. 7 is a schematic diagram of a current path in an antenna device according to an embodiment of the present application.

Fig. 8 is a schematic diagram of a fourth structure of an antenna device according to an embodiment of the present application.

Fig. 9 is a schematic diagram of a fifth structure of an antenna apparatus according to an embodiment of the present application.

Fig. 10 is a schematic diagram of a sixth structure of an antenna device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides electronic equipment. The electronic device may be a smart phone, a tablet computer, or other devices, and may also be a game device, an AR (Augmented Reality) device, an automobile device, a data storage device, an audio playing device, a video playing device, a notebook computer, a desktop computing device, or other devices.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device 100 according to an embodiment of the present disclosure.

The electronic device 100 includes a display screen 10, a housing 20, a circuit board 30, and a battery 40.

The display screen 10 is disposed on the casing 20 to form a display surface of the electronic device 100 for displaying images, texts, and other information. The Display screen 10 may include a Liquid Crystal Display (LCD) or an Organic Light-Emitting Diode (OLED) Display screen.

It will be appreciated that the display screen 10 may include a display surface and a non-display surface opposite the display surface. The display surface is a surface of the display screen 10 facing a user, i.e. a surface of the display screen 10 visible to a user on the electronic device 100. The non-display surface is a surface of the display screen 10 facing the inside of the electronic device 100. The display surface is used for displaying information, and the non-display surface does not display information.

It will be appreciated that a cover plate may also be provided over the display screen 10 to protect the display screen 10 from scratching or water damage. The cover plate may be a transparent glass cover plate, so that a user can observe contents displayed on the display screen 10 through the cover plate. It will be appreciated that the cover plate may be a glass cover plate of sapphire material.

The housing 20 is used to form an outer contour of the electronic apparatus 100 so as to accommodate electronic devices, functional components, and the like of the electronic apparatus 100, while forming a sealing and protecting function for the electronic devices and functional components inside the electronic apparatus. For example, the camera, the circuit board, and the vibration motor of the electronic device 100 may be disposed inside the housing 20. It will be appreciated that the housing 20 may include a metal bezel and a metal battery cover.

The metal middle frame may have a thin plate-like or sheet-like structure, or may have a hollow frame structure. The metal middle frame is used for providing a supporting function for the electronic devices or functional components in the electronic device 100 so as to mount the electronic devices or functional components of the electronic device 100 together. For example, the metal middle frame may be provided with a groove, a protrusion, a through hole, and the like, so as to facilitate mounting of the electronic device or the functional component of the electronic apparatus 100. It is understood that the material of the metal middle frame may include aluminum alloy, magnesium alloy, copper alloy, etc.

The metal battery cover is connected with the metal middle frame. For example, the metal battery cover may be attached to the metal middle frame by an adhesive such as a double-sided tape to achieve connection with the metal middle frame. The metal battery cover is used for sealing the electronic devices and functional components of the electronic device 100 inside the electronic device 100 together with the metal middle frame and the display screen 10, so as to protect the electronic devices and functional components of the electronic device 100. It will be appreciated that the metal battery cover may be integrally formed. In the molding process of the metal battery cover, a post-camera mounting hole and other structures can be formed on the metal battery cover. It is understood that the material of the metal battery cover may also include aluminum alloy, magnesium alloy, copper alloy, etc.

A circuit board 30 is disposed inside the housing 20. For example, the circuit board 30 may be mounted on a metal middle frame of the case 20 to be fixed, and the circuit board 30 is sealed inside the electronic device by a metal battery cover. The circuit board 30 may be a main board of the electronic device 100. One or more of functional components such as a processor, a camera, an earphone interface, an acceleration sensor, a gyroscope, and a motor may also be integrated on the circuit board 30. Meanwhile, the display screen 10 may be electrically connected to the circuit board 30 to control the display of the display screen 10 by a processor on the circuit board 30.

The battery 40 is disposed inside the case 20. For example, the battery 40 may be mounted on a metal middle frame of the case 20 to be fixed, and the battery 40 is sealed inside the electronic device by a metal battery cover. Meanwhile, the battery 40 is electrically connected to the circuit board 30 to enable the battery 40 to supply power to the electronic device 100. The circuit board 30 may be provided thereon with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 40 to the various electronic devices in the electronic apparatus 100.

The electronic device 100 is further provided with an antenna device 200. The antenna device 200 is used for implementing a wireless communication function of the electronic device 100, for example, the antenna device 200 may be used for implementing near field communication (NFC communication). It is understood that some components of the antenna device 200 may be integrated on the circuit board 30 inside the housing 20, for example, the signal processing chip and the signal processing circuit in the antenna device 200 may be integrated on the circuit board 30. In addition, some components of the antenna device 200 may be directly disposed on the housing 20. For example, a radiator or a conductor for radiating a signal of the antenna device 200 may be directly provided on the housing 20.

Referring to fig. 2, fig. 2 is a schematic diagram of a first structure of an antenna apparatus 200 according to an embodiment of the present disclosure. The antenna device 200 includes a near field communication chip 21, a ground plane 22, a first metal branch 23, a conductor portion 25, and a radiation field enhancer 26.

Therein, a near field communication chip (NFC IC)21 may be used to provide a differential excitation current comprising two current signals. The two current signals are identical in amplitude and opposite in phase, or are understood to be 180 degrees out of phase. In addition, the differential excitation current is a balanced signal. It can be understood that the analog signal is an unbalanced signal if directly transmitted during the transmission process; if the original analog signal is inverted and then the inverted analog signal and the original analog signal are transmitted simultaneously, the inverted analog signal and the original analog signal are called balanced signals. The balanced signal passes through the differential amplifier in the transmission process, the original analog signal and the inverted analog signal are subtracted to obtain an enhanced original analog signal, and because the two transmission lines are subjected to the same interference in the transmission process, the same interference signal is subtracted in the subtraction process, the anti-interference performance of the balanced signal is better.

The NFC IC21 includes a first differential signal terminal 211 and a second differential signal terminal 212. For example, the first differential signal terminal 211 may be a positive (+) port of the NFC IC21, and the second differential signal terminal 212 may be a negative (-) port of the NFC IC 21. The first differential signal terminal 211 and the second differential signal terminal 212 are used for providing the differential excitation current. For example, the differential excitation current provided by the NFC IC21 may be output into the antenna device 200 via the first differential signal terminal 211, and flow back into the NFC IC21 via the second differential signal terminal 212, thereby forming a current loop. It is understood that, in other embodiments, the first differential signal terminal 211 may be a negative (-) port of the NFC IC21, and the second differential signal terminal 212 may be a positive (+) port of the NFC IC 21.

Therein, it is understood that the NFC IC21 may be disposed on the circuit board 30 of the electronic device 100, as shown in fig. 2. Alternatively, a smaller separate circuit board may be provided in the electronic device 100 and the NFC IC21 may be integrated on the separate circuit board. The separate circuit board may be, for example, a small board in the electronic device 100.

The ground plane 22 is used to form a common ground. The ground plane 22 includes a first ground portion 221 and a second ground portion 222 disposed at an interval. The first ground portion 221 and the second ground portion 222 may be, for example, an end portion of the ground plane 22, or may also be a protruding structure on the ground plane 22, or may also be a pad formed on the ground plane 22, or may also be an area on the ground plane 22, and so on.

Wherein the ground plane 22 forms a conductive path between the first ground portion 221 and the second ground portion 222, which may be used to conduct current. That is, when a voltage signal is applied to the first and

second ground parts

221 and 222, a current may be generated between the first and

second ground parts

221 and 222, thereby forming a current loop. It is understood that when the NFC IC21 provides a differential excitation current, the conductive path between the first ground 221 and the second ground 222 may be used to transmit the differential excitation current.

Referring to fig. 3, fig. 3 is a schematic structural diagram of the ground plane 22 in the antenna device shown in fig. 2. The ground plane 22 may be formed by a metal structure in the electronic device 100. For example, the ground plane 22 may be formed by a metal middle frame of the electronic device 100, i.e. the ground plane 22 comprises a metal middle frame of the electronic device. For another example, the ground plane 22 may be formed by a metal battery cover of the electronic device 100, that is, the ground plane 22 includes the metal battery cover of the electronic device.

In the ground plane 22, the first ground portion 221 extends to form a first metal branch 23. For example, the first ground portion 221 may extend in a direction parallel to the main body portion 220 of the ground plane 22 to form the first metal branch 23. A first gap 223 is formed between the first metal branch 23 and the main body 220, so that the end of the first metal branch 23 can form a free end.

The first metal branch 23 is electrically connected to the first differential signal terminal 211 of the NFC IC21, so that the first differential signal terminal 211 feeds power to the first metal branch 23.

The conductor portion 25 is spaced apart from the ground plane 22. For example, the conductor portion 25 may be disposed above the ground plane 22 in the thickness direction of the ground plane 22. Wherein the conductor portion 25 is electrically insulated from the ground plane 22. The conductor portion 25 is electrically connected to the second differential signal terminal 212 of the NFC IC21, so that the second differential signal terminal 212 feeds power to the conductor portion 25. For example, one end of the conductor portion 25 may be electrically connected to the second differential signal terminal 212, and the other end of the conductor portion 25 may be grounded.

The radiation field enhancing body 26 is arranged between the conductor portion 25 and the ground plane 22. The material of the radiation field enhancement member 26 may include an insulating material. For example, the radiation field enhancer 26 may include a ferrite layer formed of a ferrite material, which may be a nickel copper zinc-based material having a prescribed content of iron oxide, copper oxide, zinc oxide, and nickel oxide. In addition, the ferrite material may further include some auxiliary materials, such as bismuth oxide, silicon oxide, magnesium oxide, cobalt oxide, etc. in a predetermined content. The radiation field enhancer 26 may be used to enhance the field strength of a near field communication radiation field (NFC radiation field) generated by the conductor portion 25 when transmitting a differential excitation current.

Wherein the conductor part 25, the conductive path on the ground plane 22, and the first metal branch 23 together form a conductive loop for transmitting the differential excitation current. That is, the differential excitation current is output from one signal terminal of the NFC IC21, for example, the first differential signal terminal 211, then fed into the first metal stub 23, transmitted to the conductive path on the ground plane 22 via the first metal stub 23, then transmitted to the conductor portion 25 via the conductive path, and finally reflows to the second differential signal terminal 212 of the NFC IC21 through the conductor portion 25, thereby forming a complete current loop.

It is understood that when the conductive loop transmits the differential excitation current, the conductive portion 25, the conductive path on the ground plane 22, and the first metal branch 23 may jointly generate an alternating electromagnetic field, so as to radiate an NFC signal outwards to implement NFC communication of the electronic device 100.

When the conductive loop transmits the differential excitation current, the first metal branch 23 generates a first near field communication radiation field (first NFC radiation field), the conductor portion 25 generates a second near field communication radiation field (second NFC radiation field), and the conductive path on the ground plane 22 generates a third near field communication radiation field (third NFC radiation field). Wherein the second NFC radiating field at least partially overlaps the first NFC radiating field, and the third NFC radiating field at least partially overlaps both the first NFC radiating field and the second NFC radiating field. Therefore, the first NFC radiation field, the second NFC radiation field, and the third NFC radiation field may be mutually enhanced to improve the field strength of the entire NFC radiation field of the antenna device 200, so as to improve the stability of the electronic device 100 during NFC communication.

It can be understood that when the conductor portion 25 transmits the differential excitation current, an NFC radiation field, that is, a second NFC radiation field, may be generated on the conductor portion 25, and at this time, the radiation field enhancer 26 may enhance the field strength of the NFC radiation field generated by the conductor portion 25, so as to enhance the NFC signal radiated outwards, thereby increasing the NFC signal strength of the electronic device 100.

It should be noted that, when the conductive paths on the ground plane 22 transmit the differential excitation current, although the radiation field enhancement members 26 also act on the NFC radiation field generated by the conductive paths, since the NFC signals radiated by the antenna device 200 are mainly concentrated on the side where the conductor portions 25 are located, and the radiation field enhancement members 26 have a shielding effect on the electromagnetic signals, the radiation field enhancement members 26 have a weakening effect on the NFC radiation field generated by the conductive paths located on the other side, rather than an enhancement effect, for the side where the conductor portions 25 are located.

Referring to fig. 4, fig. 4 is a schematic diagram of a second structure of an antenna device 200 according to an embodiment of the present application.

The conductor portion 25 includes a first conductor segment 251, a second conductor segment 252, and a third conductor segment 253, and the first conductor segment 251, the second conductor segment 252, and the third conductor segment 253 are connected in this order. The radiation field enhancing members 26 may be arranged between at least one of the first conductor segments 251, the second conductor segments 252, the third conductor segments 253 and the ground plane 22. For example, the radiation field enhancement members 26 may be disposed between the first conductor segments 251 and the ground plane 22, between the second conductor segments 252 and the ground plane 22, between the third conductor segments 253 and the ground plane 22, or between the first conductor segments 251, the second conductor segments 252, the third conductor segments 253 and the ground plane 22 at the same time. Therefore, the radiation field enhancement member 26 can enhance the NFC radiation field generated by only one or two conductor segments, and can also enhance the NFC radiation field generated by all the conductor segments of the conductor portion 25.

Wherein the first conductor segments 251 are arranged in a first direction. The first direction may be a preset direction. For example, the first direction may be a direction parallel to one edge of the ground plane 22. The second conductor segments 252 are arranged in a second direction, which is perpendicular to the first direction. For example, the second direction may be a direction parallel to the other edge of the ground plane 22, and the two edges are perpendicular to each other. Wherein the first direction and the second direction are both parallel to the ground plane. The third conductor segments 253 are arranged in the first direction. Thus, the first conductor segments 251, the second conductor segments 252, and the third conductor segments 253 may constitute a loop path, or may be understood as a C-type path. Therefore, when the differential excitation current is transmitted, the NFC radiation fields generated by the first conductor segments 251, the second conductor segments 252, and the third conductor segments 253 may cover each other to achieve an overlap of the NFC radiation fields, thereby enhancing the field strength of the NFC radiation fields in the region covered by the conductor portions 25. Therefore, the effective read-write (card swiping) area of the NFC antenna of the electronic device 100 can be increased, and the stability of the NFC antenna of the electronic device 100 during reading and writing (card swiping) can be improved.

It is understood that the electronic device 100 may further include a camera module 60. The camera module 60 is spaced apart from the ground plane 22. For example, the camera module 60 may be disposed on the same side of the ground plane 22 as the conductor portion 25. The camera module 60 may include one or more cameras, and may further include other functional elements such as a camera decoration element.

The second conductor segment 252 of the conductor part 25 is disposed in parallel with the camera module 60, and the first conductor segment 251 and the third conductor segment 253 are both located on the same side of the camera module 60. Alternatively, it can be understood that the first conductor segment 251 extends toward the camera module 60, the second conductor segment 252 is bent by an end of the first conductor segment 251 in a direction parallel to the camera module 60, and the third conductor segment 253 extends from an end of the second conductor segment 252 toward a direction away from the camera module 60.

It can be understood that the camera module 60 occupies a larger internal space in the electronic device 100, so that when the second conductor segment 252 is bent in a direction parallel to the camera module 60, the layout of the conductor portion 25 can be set while avoiding the camera module 60, thereby facilitating the layout of the conductor portion 25, and the first conductor segment 251, the second conductor segment 252, and the third conductor segment 253 form a C-shaped path, which can also enhance the NFC field strength of the region covered by the conductor portion 25, so as to increase the effective read-write (card swiping) area of the NFC antenna of the electronic device 100.

Referring to fig. 5 and fig. 6, fig. 5 is a schematic structural diagram of a third antenna device 200 according to an embodiment of the present application, and fig. 6 is a schematic structural diagram of a ground plane 22 in the antenna device shown in fig. 5.

In the ground plane 22, the second ground portion 222 may also extend in a direction parallel to the main body portion 220 of the ground plane 22 to form a second metal branch 24. A second gap 224 is formed between the second metal branch 24 and the main body 220, so that the end of the second metal branch 24 can also be a free end. The extending direction of the second metal branch 24 and the extending direction of the first metal branch 23 may be the same or different.

It is understood that the first metal branch 23 and the second metal branch 24 may be formed by machining. For example, the main body 220 may be formed by a molding process such as injection molding, and then the first slit 223 and the second slit 224 may be machined in the main body 220 by a machining process such as turning or milling. The first slit 223 and the second slit 224 penetrate the main body 220 in the thickness direction of the main body 220, thereby forming the first metal branch 23 and the second metal branch 24.

Wherein the second metal branch 24 is electrically connected to the second differential signal terminal 212 of the NFC IC21 through the conductor portion 25. For example, one end of the conductor portion 25 may be electrically connected to the second differential signal terminal 212, and the other end of the conductor portion 25 is electrically connected to the second metal branch 24, so as to electrically connect the second metal branch 24 to the second differential signal terminal 212. Therefore, the second metal branch 24 may also be used to transmit the differential excitation current provided by the NFC IC 21. That is, the conductor part 25, the second metal branch 24, the conductive path on the ground plane 22, and the first metal branch 23 together form a conductive loop for transmitting the differential excitation current.

It can be understood that the differential excitation current is transmitted through the second metal branch 24, so that the second metal branch 24 may also generate an NFC radiation field to radiate an NFC signal outwards, so as to further increase an NFC signal coverage area of the electronic device 100, thereby further increasing an effective read-write (card swiping) area of the NFC antenna of the electronic device 100.

Referring to fig. 7, fig. 7 is a schematic diagram of a current path in the antenna device 200 according to the embodiment of the present application. When the conductive loop transmits the differential excitation current, the current is transmitted from the first differential signal terminal 211 of the NFC IC21 to the first metal branch 23, then transmitted from the first metal branch 23 to the ground plane 22, then transmitted to the second metal branch 24 through the conductive path on the ground plane 22, then transmitted to the conductor portion 25 through the second metal branch 24, and finally transmitted to the second differential signal terminal 212 of the NFC IC21 through the conductor portion 25.

It should be noted that, according to the electromagnetic field theory, when the conductive path on the ground plane 22 transmits the differential excitation current, the current path is close to the first metal branch 23, the conductor portion 25, and the second metal branch 24, so that the direction of a part of the current on the conductive path is opposite to the direction of the current on the conductor portion 25. Thus, the direction of the part of the NFC radiation field generated by the conductive path on the ground plane 22 is also opposite to the direction of the NFC radiation field generated by the conductor part 25. At this time, the radiation field enhancement member 26 enhances the NFC radiation field generated by the conductor portion 25, and weakens a part of the NFC radiation field generated by the conductive path on the ground plane 22, so as to prevent the NFC radiation field generated by the conductor portion 25 and a part of the NFC radiation field generated by the conductive path in the opposite direction from canceling each other, thereby further enhancing the field strength of the NFC radiation field generated by the conductor portion 25.

When the conductive loop transmits the differential excitation current, the first metal branch 23 generates a first near field communication radiation field (first NFC radiation field), and the first NFC radiation field may cover a region in a certain space around the electronic device 100. The conductor part 25 generates a second near field communication radiation field (second NFC radiation field) which may also cover an area of a space around the electronic device 100. The conductive path of the ground plane 22 generates a third near field communication radiation field (third NFC radiation field) which also covers a region of space around the electronic device 100. The second metal branch 24 generates a fourth near field communication radiation field (fourth NFC radiation field), which may also cover a region of a certain space around the electronic device 100.

Wherein it is understood that the direction of the second NFC radiated field is opposite to a portion of the direction of the third NFC radiated field. The radiation field enhancer 26 is configured to enhance the second NFC radiation field and attenuate a portion of the third NFC radiation field that is in a direction opposite to the direction of the second NFC radiation field. Therefore, the parts of the second NFC radiation field and the third NFC radiation field with opposite directions can be prevented from mutually offsetting, and the field strength of the second NFC radiation field can be increased.

It can be understood that, since the conductive path on the ground plane 22 is relatively long, the conductive path can be divided into a first conductive segment, a second conductive segment and a third conductive segment according to the position relationship between the conductive path and the first metal branch 23, the second metal branch 24 and the conductor portion 25, and the first conductive segment, the second conductive segment and the third conductive segment are connected in sequence. Wherein the first conductive segment is formed along the first metal branch 23, the second conductive segment is formed along the conductor portion 25, and the third conductive segment is formed along the second metal branch 24.

Among the first, second and third conductive segments, the second conductive segment generates a near field communication radiation field in a direction opposite to that of the second near field communication radiation field generated by the conductor portion 25, and the first and third conductive segments may generate a near field communication radiation field in a direction identical to that of the second near field communication radiation field generated by the conductor portion 25. At this time, the radiation field enhancement member 26 is used for weakening the near field communication radiation field generated by the second conductive segment, and can be used for enhancing the near field communication radiation field generated by the first conductive segment and the third conductive segment.

The area covered by the first NFC radiation field, the area covered by the second NFC radiation field and the area covered by the fourth NFC radiation field are different from each other, but may overlap partially. Wherein the second NFC radiating field at least partially overlaps the first NFC radiating field such that the second NFC radiating field and the first NFC radiating field may reinforce one another. The fourth NFC radiated field at least partially overlaps with the second NFC radiated field generated by the conductor part 25, so that the fourth NFC radiated field and the second NFC radiated field can mutually reinforce. In addition, the fourth NFC radiation field may also at least partially overlap with the first NFC radiation field generated by the first metal branch 23, so that the fourth NFC radiation field and the first NFC radiation field may also mutually enhance. Therefore, the stability of the NFC antenna of the electronic device 100 at the time of reading and writing (swiping) can be improved.

For example, in practical applications, when an NFC receiver (e.g., a subway card swiping machine) reads an NFC signal near the position of the first metal branch 23, the first NFC radiation field formed by the first metal branch 23 serves as a main radiation field, and the fourth NFC radiation field formed by the second metal branch 24 can compensate the main radiation field, so that a position with a weaker field strength in the main radiation field can be compensated, so as to enhance the field strength of the entire area of the main radiation field. Similarly, when the NFC receiver reads an NFC signal near the second metal branch 24, the fourth NFC radiation field formed by the second metal branch 24 serves as a main radiation field, and the first NFC radiation field formed by the first metal branch 23 may compensate for the main radiation field.

Therefore, in the electronic device 100, it can be ensured that the NFC signal can be transmitted and received at any position of the NFC radiation field formed by the first metal branch 23 and the second metal branch 24, so as to implement NFC communication between the electronic device 100 and other electronic devices.

Furthermore, it is understood that there may be at least a partial overlap of the second NFC radiation field generated by the conductor portion 25 with the first NFC radiation field, and there may also be at least a partial overlap of the second NFC radiation field with the fourth NFC radiation field, such that the second NFC radiation field and the first NFC radiation field may mutually reinforce, and the second NFC radiation field and the fourth NFC radiation field may mutually reinforce. Thus, both the area of the NFC radiated field around the electronic device 100 and the field strength of the overlapping area may be enhanced. Therefore, the effective read-write (card swiping) area of the NFC antenna of the electronic device 100 can be increased, and the stability of the NFC antenna of the electronic device 100 during reading and writing (card swiping) can be improved.

In the antenna device 200 provided in the embodiment of the present application, the first metal branch 23 is formed on the ground plane 22, the conductor portion 25 is provided, and the conductive path is formed on the ground plane 22, so that a conductive loop for transmitting the NFC differential excitation current can be formed by the first metal branch 23, the conductive path, and the conductor portion 25 together, and the radiation field enhancement member 26 is provided between the conductor portion 25 and the ground plane 22, and the radiation field enhancement member 26 can enhance the field intensity of the NFC radiation field generated by the conductor portion 25. Because the first metal branch 23 can be formed at different positions of the ground plane 22 according to the requirement of the internal space design of the electronic device 100, and the conductor part 25 can also be arranged at different positions of the electronic device 100, the design of the NFC antenna can be realized through different positions of the electronic device 100, so that the occupied space of the NFC antenna can be saved, and the layout of the NFC antenna can be more flexible. In addition, the radiation field enhancement member 26 is disposed in the antenna device 200, so that the field intensity of the NFC radiation field generated by the conductor portion 25 can be enhanced, and the NFC signal strength and the coverage of the electronic device 100 can be improved.

Referring to fig. 8, fig. 8 is a schematic diagram illustrating a fourth structure of an antenna device 200 according to an embodiment of the present application. The antenna device 200 further includes a first non-near-field communication chip 271 and a second non-near-field communication chip 272. Wherein the first non-near-field communication chip 271 is, for example, IC 1, and the second non-near-field communication chip 272 is, for example, IC 2. It is understood that the first non-near-field communication chip 271 and the second non-near-field communication chip 272 may be integrated on the circuit board 30 of the electronic device 100.

The first non-near-field communication chip 271 is configured to provide a first non-near-field communication excitation signal. Wherein the first non-near-field communication excitation signal is an unbalanced signal. The first non-near-field communication excitation signal may comprise one of a cellular network signal, a Wi-Fi signal, a GPS signal, a BT signal. Accordingly, the first non-near-field communication chip 271 may be a cellular communication chip for providing the cellular network signal; the first non-near-field communication chip 271 may be a Wi-Fi chip for providing the Wi-Fi signals; the first non-near-field communication chip 271 may be a GPS chip for providing the GPS signal; the first non-near-field communication chip 271 may also be a BT chip for providing the BT signal.

The first metal stub 23 is further electrically connected to the first non-near-field communication chip 271, and the first non-near-field communication chip 271 is grounded. Thus, the first non-near-field communication chip 271 can feed the first non-near-field communication excitation signal to the first metal stub 23. Thus, the first metal stub 23 may also be used to transmit the first non-near-field communication excitation signal.

It can be understood that the first metal branch 23 may be used to transmit the differential excitation current provided by the NFC IC21 and also may be used to transmit the first non-near-field communication excitation signal provided by the first non-near-field communication chip 271, so that multiplexing of the first metal branch 23 may be implemented, the number of radiators used for transmitting wireless signals in the electronic device 100 may be reduced, and therefore, the internal space of the electronic device 100 may be saved.

It should be noted that the frequency of the NFC signal is usually 13.56MHz (megahertz), the frequency of the cellular network signal is usually above 700MHz, the frequency of the Wi-Fi signal is usually 2.4GHz (gigahertz) or 5GHz, the frequency of the GPS signal usually includes multiple frequency bands such as 1.575GHz, 1.227GHz, 1.381GHz, 1.841GHz, and the frequency of the BT signal is usually 2.4 GHz. Thus, the NFC signal is a low frequency signal and the cellular network signal, Wi-Fi signal, GPS signal, BT signal are all high frequency signals relative to the cellular network signal, Wi-Fi signal, GPS signal, BT signal. Alternatively, it may be understood that the NFC signal is a low-frequency signal, the first non-near-field communication excitation signal is a high-frequency signal, and the frequency of the NFC signal is smaller than the frequency of the first non-near-field communication excitation signal.

In addition, when transmitting wireless signals, the lower the frequency of the wireless signals is, the longer the length of the required radiator is; the higher the frequency of the radio signal, the shorter the required radiator length. That is, a length of a radiator required to transmit the NFC signal is greater than a length of a radiator required to transmit the first non-near-field communication excitation signal.

The first metal branch 23 includes a first feeding end 231 and a third feeding end 232 arranged at an interval. The first feeding terminal 231 is electrically connected to the first differential signal terminal 211. The third feeding end 232 is electrically connected with the first non-near-field communication chip 271. The distance between the first feeding end 231 and the first grounding portion 221 is greater than the distance between the third feeding end 232 and the first grounding portion 221. Therefore, in the first metal branch 23, the length of the radiator for transmitting the NFC signal may be greater than the length of the radiator for transmitting the first non-near-field communication excitation signal.

The second non-near-field communication chip 272 is configured to provide a second non-near-field communication excitation signal. Wherein the second non-near-field communication excitation signal is an unbalanced signal. The second non-near-field communication excitation signal may comprise one of a cellular network signal, a wireless fidelity signal (Wi-Fi signal), a global positioning system signal (GPS signal), a bluetooth signal (BT signal). Accordingly, the second non-near-field communication chip 272 may be a cellular communication chip for providing the cellular network signal; the second non-near-field communication chip 272 may be a Wi-Fi chip for providing the Wi-Fi signals; the second non-near field communication chip 272 may be a GPS chip for providing the GPS signal; the second non-near-field communication chip 272 may also be a BT chip for providing the BT signal.

It should be noted that the second non-near-field communication excitation signal and the first non-near-field communication excitation signal may be signals of the same communication type or signals of different communication types. Accordingly, the second non-near-field communication chip 272 and the first non-near-field communication chip 271 may be the same type of chip or different types of chips.

The second metal branch 24 is further electrically connected to the second non-near-field communication chip 272, and the second non-near-field communication chip 272 is grounded. Thus, the second non-near-field communication chip 272 may feed the second non-near-field communication excitation signal to the second metal stub 24. Therefore, the second metal stub 24 may also be used to transmit the second non-near-field communication excitation signal.

It can be understood that the second metal branch 24 may be used to transmit the differential excitation current provided by the NFC IC21 and the second non-near-field communication excitation signal provided by the second non-near-field communication chip 272, so that multiplexing of the second metal branch 24 may be implemented, the number of radiators used for transmitting wireless signals in the electronic device 100 may be further reduced, and the internal space of the electronic device 100 may be further saved.

The second metal branch 24 includes a second feeding end 241 and a fourth feeding end 242 which are arranged at an interval. The second feeding end 241 is electrically connected to the second differential signal end 212 through the conductor part 25. The fourth feeding end 242 is electrically connected to the second non-near-field communication chip 272. The distance between the second feeding end 241 and the second grounding portion 222 is greater than the distance between the fourth feeding end 242 and the second grounding portion 222. Therefore, in the second metal branch 24, the length of the radiator for transmitting the NFC signal may be greater than the length of the radiator for transmitting the second non-near-field communication excitation signal.

Referring to fig. 9, fig. 9 is a schematic diagram of a fifth structure of an antenna device 200 according to an embodiment of the present application. The antenna device 200 further includes a first matching circuit M1, a second matching circuit M2, a third matching circuit M3, a first filter circuit LC1, a second filter circuit LC2, a third filter circuit LC3, and a fourth filter circuit LC 4. It will be appreciated that the matching circuit may also be referred to as a matching network, a tuning circuit, a tuning network, etc. The filter circuit may also be referred to as a filter network.

The first matching circuit M1 is electrically connected to the first differential signal terminal 211 of the NFC IC21, the second differential signal terminal 212 of the NFC IC21, the conductor part 25, and the first metal branch 23. The first matching circuit M1 is used for matching the impedance of the conductive loop when transmitting the differential excitation current. The conductive loop is a conductive loop formed by the conductor portion 25, the conductive path on the ground plane 22, and the first metal branch 23, or a conductive loop formed by the conductor portion 25, the second metal branch 24, the conductive path on the ground plane 22, and the first metal branch 23.

The first matching circuit M1 includes a first input terminal a, a second input terminal b, a first output terminal c, and a second output terminal d. The first input end a is electrically connected to the first differential signal end 211 of the NFC IC21, the second input end b is electrically connected to the second differential signal end 212 of the NFC IC21, the first output end c is electrically connected to the first metal branch 23, and the second output end d is electrically connected to the conductor part 25.

The first filter circuit LC1 is disposed between the first output c of the first matching network M1 and the first metal branch 23. The first filter circuit LC1 is configured to filter a first interference signal between the first output terminal c of the first matching network M1 and the first metal branch 23. The first interference signal is an electrical signal other than the differential excitation current provided by the NFC IC 21.

The second filter circuit LC2 is disposed between the second output terminal d of the first matching circuit M1 and the conductor part 25. The second filter circuit LC2 is used for filtering out a second interference signal between the second output terminal d of the first matching circuit M1 and the conductor part 25. The second interference signal is an electrical signal other than the differential excitation current provided by the NFC IC 21.

The first non-near-field communication chip 271 is electrically connected to the first metal branch 23 through the second matching circuit M2. The second matching circuit M2 is configured to match the impedance of the first metal branch 23 when transmitting the first non-near-field communication excitation signal.

The third filter circuit LC3 is disposed between the second matching circuit M2 and the first metal branch 23. The third filter circuit LC3 is configured to filter a third interference signal between the second matching circuit M2 and the first metal branch 23. The third interference signal is an electrical signal other than the first non-near-field communication excitation signal provided by the first non-near-field communication chip 271.

The second non-near-field communication chip 272 is electrically connected to the second metal branch 24 through the third matching circuit M3. The third matching circuit M3 is configured to match the impedance of the second metal branch 24 when transmitting the second non-near-field communication excitation signal.

The fourth filter circuit LC4 is disposed between the third matching circuit M3 and the second metal stub 24. The fourth filter circuit LC4 is configured to filter a fourth interference signal between the third matching circuit M3 and the second metal branch 24. The fourth interference signal is an electrical signal other than the second non-near-field communication excitation signal provided by the second non-near-field communication chip 272.

It should be understood that the first matching circuit M1, the second matching circuit M2, and the third matching circuit M3 may include any series or parallel circuit of capacitors and inductors. The first filter circuit LC1, the second filter circuit LC2, the third filter circuit LC3, and the fourth filter circuit LC4 may also include a circuit formed by any series connection or any parallel connection of capacitors and inductors.

Referring to fig. 10, fig. 10 is a schematic diagram illustrating a sixth structure of an antenna device 200 according to an embodiment of the present application.

The first matching circuit M1 may include, for example, four capacitors C1, C2, C3, and C4. The capacitor C1 is connected in series with the first differential signal terminal 211 of the NFC IC21, and the capacitor C2 is connected in series with the second differential signal terminal 212 of the NFC IC 21. The capacitor C3 is connected in series with the capacitor C4 and after series connected in parallel with the NFC IC 21. It is understood that the capacitance values of the capacitors C1, C2, C3 and C4 can be set according to actual needs.

The first filter circuit LC1 may include, for example, an inductor L1 and a capacitor C5. Wherein an inductor L1 is connected in series between the first matching circuit M1 and the first metal stub 23, and a capacitor C5 is connected in parallel with the NFC IC21 and to ground. It is understood that the inductance of the inductor L1 and the capacitance of the capacitor C5 can be set according to actual needs.

The second filter circuit LC2 may include, for example, an inductor L2 and a capacitor C6. Wherein an inductor L2 is connected in series between the first matching circuit M1 and the conductor part 25, and a capacitor C6 is connected in parallel with the NFC IC21 and to ground. It is understood that the inductance of the inductor L2 and the capacitance of the capacitor C6 can be set according to actual needs.

The second matching circuit M2 may include, for example, capacitors C7, C8. The capacitor C7 is connected in series between the first metal stub 23 and the first non-near-field communication chip 271, and the capacitor C8 is connected in parallel with the first non-near-field communication chip 271 and grounded. It is understood that the capacitance values of the capacitors C7 and C8 can be set according to actual needs.

The third filter circuit LC3 may include, for example, an inductor L3 and a capacitor C9. Wherein, the inductor L3 is connected in series between the second matching circuit M2 and the first metal branch 23, and the capacitor C9 is connected in parallel and grounded with the first non-near-field communication chip 271. It is understood that the inductance of the inductor L3 and the capacitance of the capacitor C9 can be set according to actual needs.

The third matching circuit M3 may include, for example, capacitors C10, C11. The capacitor C10 is connected in series between the second metal branch 24 and the second non-near-field communication chip 272, and the capacitor C11 is connected in parallel with the second non-near-field communication chip 272 and is grounded. It is understood that the capacitance values of the capacitors C10 and C11 can be set according to actual needs.

The fourth filter circuit LC4 may include, for example, an inductor L4 and a capacitor C12. Wherein, the inductor L4 is connected in series between the third matching circuit M3 and the second metal branch 24, and the capacitor C12 is connected in parallel and grounded with the second non-near-field communication chip 272. It is understood that the inductance of the inductor L4 and the capacitance of the capacitor C12 can be set according to actual needs.

The antenna device and the electronic device provided in the embodiments of the present application are described in detail above. The principles and implementations of the present application are described herein using specific examples, which are presented only to aid in understanding the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. An antenna device, comprising:

2. The antenna device of claim 1, wherein the conductive loop, when carrying the differential excitation current, the first metal stub generates a first near-field communication radiation field, the conductor portion generates a second near-field communication radiation field, and the conductive path generates a third near-field communication radiation field that at least partially overlaps the first near-field communication radiation field and the second near-field communication radiation field.

3. The antenna device according to claim 1, wherein the conductor portion comprises a first conductor segment, a second conductor segment, and a third conductor segment connected in sequence, and the radiation field enhancer is disposed between the ground plane and at least one of the first conductor segment, the second conductor segment, and the third conductor segment.

4. The antenna device according to claim 3, wherein the first conductor segments are arranged in a first direction, the second conductor segments are arranged in a second direction perpendicular to the first direction, and the third conductor segments are arranged in the first direction, wherein the first direction and the second direction are parallel to the ground plane.

5. The antenna device according to any one of claims 1 to 4, wherein the second ground portion extends to form a second metal branch, and the second metal branch is electrically connected to the second differential signal terminal through the conductor portion;

wherein the conductor portion, the second metal stub, the conductive path, and the first metal stub together form a conductive loop for transmitting the differential excitation current.

6. The antenna device of claim 5, wherein the conductor portion generates a second near field communication radiation field in a direction opposite to a portion of a third near field communication radiation field generated by the conductive path, and wherein the radiation field enhancer is configured to enhance the second near field communication radiation field and attenuate a portion of the third near field communication radiation field in a direction opposite to the direction of the second near field communication radiation field.

7. The antenna device according to claim 6, wherein the conductive path includes a first conductive segment, a second conductive segment, and a third conductive segment connected in sequence, the first conductive segment being formed along the first metal stub, the second conductive segment being formed along the conductor portion, and the third conductive segment being formed along the second metal stub.

8. The antenna device of claim 7, wherein the direction of the near field communication radiation field generated by the second conductive segment is opposite to the direction of the second near field communication radiation field generated by the conductor portion, and wherein the radiation field enhancer is configured to attenuate the near field communication radiation field generated by the second conductive segment.

9. The antenna device of claim 5, wherein the second metal stub generates a fourth near field communication radiation field when the conductive loop transmits the differential excitation current, the fourth near field communication radiation field at least partially overlapping with the second near field communication radiation field generated by the conductor portion.

10. The antenna device according to any one of claims 1 to 4, further comprising:

a first non-near-field communication chip for providing a first non-near-field communication excitation signal;

the first metal stub is further electrically connected with the first non-near-field communication chip, and the first metal stub is further used for transmitting the first non-near-field communication excitation signal.

11. The antenna device according to claim 10, wherein the first metal branch section includes a first feeding end and a third feeding end that are disposed at an interval, the first feeding end is electrically connected to the first differential signal end, the third feeding end is electrically connected to the first non-near-field communication chip, and a distance between the first feeding end and the first ground portion is greater than a distance between the third feeding end and the first ground portion.

12. The antenna device of claim 5, further comprising:

a second non-near-field communication chip for providing a second non-near-field communication excitation signal;

the second metal branch is further electrically connected with the second non-near-field communication chip, and the second metal branch is further used for transmitting the second non-near-field communication excitation signal.

13. The antenna device according to claim 12, wherein the second metal branch section includes a second feeding end and a fourth feeding end that are disposed at an interval, the second feeding end is electrically connected to the second differential signal end through the conductor portion, the fourth feeding end is electrically connected to the second non-near-field communication chip, and a distance between the second feeding end and the second ground portion is greater than a distance between the fourth feeding end and the second ground portion.

14. The antenna device according to any one of claims 1 to 4, further comprising a first matching circuit electrically connected to the first differential signal terminal, the second differential signal terminal, the conductor portion, and the first metal stub, wherein the first matching circuit is configured to match an impedance of the conductive loop when the differential excitation current is transmitted.

15. The antenna device of claim 14, wherein:

the first matching circuit comprises a first input end, a second input end, a first output end and a second output end;

the first input end is electrically connected with the first differential signal end, the second input end is electrically connected with the second differential signal end, the first output end is electrically connected with the first metal branch knot, and the second output end is electrically connected with the conductor part.

16. The antenna device according to claim 10, further comprising a second matching circuit, wherein the first non-near-field communication chip is electrically connected to the first metal stub through the second matching circuit, and wherein the second matching circuit is configured to match an impedance of the first metal stub when the first non-near-field communication excitation signal is transmitted.

17. The antenna device according to claim 12, further comprising a third matching circuit, wherein the second non-near-field communication chip is electrically connected to the second metal stub through the third matching circuit, and the third matching circuit is configured to match an impedance of the second metal stub when the second non-near-field communication excitation signal is transmitted.

18. The antenna device according to any of claims 1 to 4, characterized in that the radiation field enhancer comprises a ferrite layer.

19. An electronic device, characterized in that it comprises an antenna device according to any one of claims 1 to 18.

20. The electronic device of claim 19, further comprising a camera module, the camera module being spaced apart from the ground plane;

the second conductor section of the conductor part is arranged in parallel with the camera module, and the first conductor section and the third conductor section of the conductor part are positioned on the same side of the camera module.