CN212874761U

CN212874761U - Antenna device and electronic apparatus

Info

Publication number: CN212874761U
Application number: CN202021585013.7U
Authority: CN
Inventors: 张盛强
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2021-04-02
Anticipated expiration: 2030-08-03

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; a first conductor structure; a second conductor structure; a matching circuit; the first conductor structure, the conductive path and the second conductor structure together form a conductive loop for transmitting the differential excitation current, and the first conductor structure and the second conductor structure have the same resonance frequency through a plurality of first capacitors connected in parallel with the near field communication chip in the matching circuit. This application can realize the design of NFC antenna through the conductor structure cooperation ground plane at the different positions of electronic equipment to can make two antenna conductors possess same resonant frequency in the NFC antenna, thereby promote the antenna performance.

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. Wherein each communication mode of the electronic device requires a corresponding antenna to support.

With the development of electronic technology, electronic devices are increasingly miniaturized and light and thin, and the internal space of electronic devices is also increasingly small, so that a scheme of using dual antennas is developed, specifically, two grounding antennas are arranged in a near field communication antenna, so that the practicability of near field communication is improved.

Disclosure of Invention

The embodiment of the application provides an antenna device and electronic equipment, which can enable two antenna conductors in an NFC antenna to have the same resonant frequency, thereby improving the performance of the antenna.

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;

a ground plane formed with a conductive path;

a first conductor structure comprising a first feed end, the first conductor structure electrically connected with the near field communication chip and a ground plane;

a second conductor structure comprising a second feed end, the second conductor structure being electrically connected to the near field communication chip and a ground plane, wherein the first conductor structure, the conductive path, and the second conductor structure collectively form a conductive loop for transmission of the differential excitation current;

the matching circuit is electrically connected with the first differential signal end, the second differential signal end, the first feed end and the second feed end so as to match the impedance when the conductive loop transmits the differential excitation current, and the matching circuit comprises a plurality of tuning devices which are connected with the near field communication chip in parallel so that the first conductor structure and the second conductor structure have the same resonant frequency.

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 two conductor structures are arranged in the antenna device, the two conductor structures are connected to two different grounding points of the same grounding plane, the ground plane between the two grounding points is utilized to form the conducting path, so that the conducting loop for transmitting the NFC differential excitation current can be formed through the two conductor structures and the conducting path, and the first conductor structures and the second conductor structures have the same resonant frequency through the plurality of first capacitors connected with the near field communication chip in parallel in the matching circuit. This application can realize the design of NFC antenna through the conductor structure cooperation ground plane at the different positions of electronic equipment to the occupation space of NFC antenna can be saved, and the overall arrangement of NFC antenna can be more nimble.

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 view of the antenna device shown in fig. 2 disposed in an electronic device.

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 diagram of a fourth structure of an antenna apparatus according to an embodiment of the present application.

Fig. 7 is a schematic diagram of a fifth structure of an antenna apparatus according to an embodiment of the present application.

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

Fig. 9 is a schematic diagram of a seventh structure of an antenna apparatus 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 center frame and a battery cover.

The middle frame may have a thin plate-like or sheet-like structure, or may have a hollow frame structure. The 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 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 middle frame may include metal or plastic.

The battery cover is connected with the middle frame. For example, the battery cover may be attached to the center frame by an adhesive such as a double-sided tape to achieve connection with the center frame. The 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 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 battery cover may be integrally formed. In the molding process of the battery cover, a post-camera mounting hole and other structures can be formed on the battery cover. It is understood that the material of the battery cover may also include metal or plastic.

A circuit board 30 is disposed inside the housing 20. For example, the circuit board 30 may be mounted on a middle frame of the case 20 to be fixed, and the circuit board 30 is sealed inside the electronic device by a 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 middle frame of the case 20 to be fixed, and the battery 40 is sealed inside the electronic device by a 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). The antenna device 200 is disposed inside the housing 20 of the electronic apparatus 100. 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 disposed directly inside the housing 20. For example, a radiator or a conductor structure of the antenna device 200 for radiating signals may be directly disposed inside 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 conductor structure 23, and a second conductor structure 24.

In the description of the present application, it is to be understood that terms such as "first", "second", and the like are used merely to distinguish one similar element from another, and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated.

Among them, the near field communication chip (NFC chip) 21 may be used to provide a differential excitation current. Wherein the differential excitation current comprises 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 chip 21 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 chip 21, and the second differential signal terminal 212 may be a negative (-) port of the NFC chip 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 chip 21 may be output into the first conductor structure 23 via the first differential signal terminal 211, and may flow back into the NFC chip 21 through the second differential signal terminal 212 via the ground plane 22 and the second conductor structure 24 connected to the ground plane, thereby forming a current path.

It is understood that the NFC chip 21 may be disposed on the circuit board 30 of the electronic device 100, or a smaller separate circuit board may be disposed in the electronic device 100, and the NFC chip 21 is 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 may be formed by a conductor, a printed circuit, a metal printed layer, or the like in the electronic device 100. For example, the ground plane 22 may be disposed on a circuit board 30 of the electronic device 100. The ground plane 22 may also be formed on the housing 20 of the electronic device 100, for example, the ground plane 22 may be formed by a middle frame of the housing 20, or the ground plane 22 may also be formed by a battery cover of the housing 20.

The ground plane 22 comprises a first ground point 221 and a second ground point 222 arranged at a distance. The first grounding point 221 and the second grounding point 222 may be, for example, end portions 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 region on the ground plane 22, and so on.

Wherein the ground plane 22 forms a conductive path between the first ground point 221 and the second ground point 222, which conductive path may be used for conducting current. That is, when a voltage signal is applied to the first ground point 221 and the second ground point 222, a current may be generated between the first ground point 221 and the second ground point 222, thereby forming a current path. It is to be understood that when the NFC chip 21 provides a differential excitation current, a conductive path between the first grounding point 221 and the second grounding point 222 may be used to transmit the differential excitation current.

The first conductor structure 23 includes a first feeding terminal 231 and a first grounding terminal 232 arranged at intervals. The first feeding terminal 231 is electrically connected to the first differential signal terminal 211 of the NFC chip 21, so that the NFC chip 21 feeds power to the first conductor structure 23. For example, the differential excitation current provided by the NFC chip 21 may be transmitted to the first feeding terminal 231 via the first differential signal terminal 211 to realize feeding to the first conductor structure 23. The first ground terminal 232 is electrically connected to a first ground point 221 of the ground plane 22, so that a differential excitation current on the first conductor structure 23 flows back to ground.

The second conductor structure 24 includes a second feeding terminal 241 and a second grounding terminal 242 which are spaced apart. The second feeding terminal 241 is electrically connected to the second differential signal terminal 212 of the NFC chip 21, so that the NFC chip 21 feeds power to the second conductor structure 24. For example, the differential excitation current provided by the NFC chip 21 may be transmitted to the second differential signal terminal 212 via the second feeding terminal 241, so as to feed the second conductor structure 24. The second ground terminal 242 is electrically connected to a second ground point 222 of the ground plane 22, thereby enabling a differential excitation current on the second conductor structure 24 to flow back to ground.

The first conductor structure 23 and the second conductor structure 24 may be both metal structures in the electronic device 100 or metal traces on the circuit board 30. The second conductor structure 24 and the first conductor structure 23 are different conductor structures.

For example, the circuit board 30 of the electronic apparatus 100 is provided with a printed wiring. The first conductor structure 23 may be the printed wiring, or the second conductor structure 24 may be the printed wiring.

For another example, the electronic device 100 includes a Flexible Printed Circuit (FPC) electrically connected to the Circuit board 30. The FPC may be, for example, an FPC for a display screen, an FPC for a camera, an FPC for a motor, or the like, or the FPC may be an independent FPC for implementing an NFC conductor structure, which may be fixed in the housing of the electronic device 100. The FPC is provided with metal wiring, and the metal wiring is used for transmitting signals, such as control signals of a display screen, control signals of a camera, control signals of a motor and the like. The first conductor structure 23 may comprise the metal trace, or the second conductor structure 24 may comprise the metal trace.

As another example, the housing 20 of the electronic device 100 includes a middle frame, and the circuit board 30 may be disposed on the middle frame. The middle frame comprises a first metal branch and a second metal branch which are arranged at intervals. For example, a plurality of slits may be formed in the middle frame, and the first metal branch and the second metal branch may be formed by the plurality of slits. Wherein the first conductor structure 23 includes the first metal stub and the second conductor structure 24 includes the second metal stub.

In an embodiment, the first conductor structure 23 and the second conductor structure 24 may also be different structures, for example, the first conductor structure 23 may be the printed circuit, and the second conductor structure 24 includes the metal trace; or the first conductor structure 23 includes the first metal branch, and the second conductor structure 24 is the printed circuit.

For another example, the electronic device 100 may include a front camera and a rear camera, and a metal decoration ring may be disposed around the front camera and the rear camera. The first conductor structure 23 may comprise a cosmetic ring of a front camera and the second conductor structure 24 may comprise a cosmetic ring of a rear camera.

Wherein the first conductor structure 23, the conductive path on the ground plane 22 and the second conductor structure 24 together form a conductive loop for the transmission of the differential excitation current. That is, the differential excitation current is output from one signal terminal of the NFC chip 21, for example, the first differential signal terminal 211, then fed into the first conductor structure 23, transmitted to the conductive path on the ground plane 22 via the first conductor structure 23, then transmitted to the second conductor structure 24 via the conductive path, and finally returned to the second differential signal terminal 212 of the NFC chip 21 through the second conductor structure 24, thereby forming a complete current loop.

It is understood that when the conductive loop transmits the differential excitation current, the first conductor structure 23, the conductive path on the ground plane 22, and the second conductor structure 24 may jointly generate an alternating electromagnetic field, so as to radiate an NFC signal outwards to implement NFC communication of the electronic device 100.

Wherein the first conductor structure 23 generates a first near field communication radiation field (first NFC radiation field) when the conductive loop transmits the differential excitation current. The first NFC radiated field may cover an area of space around the electronic device 100. The second conductor structure 24 generates a second near field communication radiation field (second NFC radiation field). The second NFC radiated field may also cover an area of space around the electronic device 100. Wherein the second NFC radiated field at least partially overlaps the first NFC radiated field, thereby enhancing both the area of the NFC radiated field around the electronic device 100 and the field strength of the overlapping area. 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.

Furthermore, the ground plane 22 may generate a third near field communication radiation field (third NFC radiation field) when the conductive loop transmits the differential excitation current. The third NFC radiated field may also cover an area of space around the electronic device 100. Wherein the third NFC radiating field at least partially overlaps the first NFC radiating field and the third NFC radiating field at least partially overlaps the second NFC radiating field. Therefore, the region of the NFC radiation field around the electronic device 100 can be further enhanced, and the field strength of the overlapping region can be enhanced.

For example, in practical applications, when an NFC receiver (e.g., a subway swipe card) reads an NFC signal from a position close to the first conductor structure 23, the first NFC radiation field formed by the first conductor structure 23 serves as a main radiation field, and the second NFC radiation field formed by the second conductor structure 24 and the third NFC radiation field formed by the ground plane 22 can both compensate for the main radiation field, so that a position with a weaker field strength in the main radiation field can be compensated to enhance the field strength of the whole area of the main radiation field. Similarly, when the NFC receiver reads an NFC signal near the second conductor structure 24, the second NFC radiation field formed by the second conductor structure 24 serves as a main radiation field, and the main radiation field can be compensated by both the first NFC radiation field and the third NFC radiation field.

Therefore, the antenna device 200 of the present application can ensure that, in the electronic device 100, NFC signals can be transmitted and received at any position of the NFC radiation field formed by the first conductor structure 23, the second conductor structure 24, and the ground plane 22, so as to implement NFC communication between the electronic device 100 and other electronic devices.

Referring to fig. 3, fig. 3 is a schematic diagram of the antenna device shown in fig. 2 disposed in an electronic device.

Wherein the near field communication chip (NFC chip) 21 may be integrated on a circuit board of the electronic device, the first conductor structure 23 may be disposed at an end portion of the electronic device, for example, the first conductor structure 23 may be disposed at a top end of the electronic device, the ground plane 22 may be formed on the circuit board of the electronic device, and the second conductor structure 24 may be disposed at one side of the electronic device, for example, the second conductor structure 24 may be disposed at a right side of the electronic device. Thus, the differential excitation current provided by the NFC chip 21 can be transmitted from the NFC chip 21 to the first conductor structure 23 at the top end of the electronic device, then from the first conductor structure 23 to the ground plane 22 on the circuit board of the electronic device, then from the ground plane on the circuit board to the second conductor structure 24 on the right side of the electronic device, and finally back to the NFC chip 21 from the second conductor structure 24.

It should be noted that the first conductor structure is disposed at the top end of the electronic device, and the second conductor structure is disposed at the right side of the electronic device, which is only an example and is not used to limit the embodiments of the present application. It can be understood that the first conductor structure may also be disposed at other portions of the electronic device, and the second conductor structure may also be disposed at other portions of the electronic device, for example, the first conductor structure and the second conductor structure may also be disposed at a top end of the electronic device, so as to implement NFC communication with other electronic devices through different portions of the electronic device, for example, NFC communication may be implemented through a front surface of the electronic device (i.e., a surface where a display screen of the electronic device is located), and NFC communication may also be implemented through a back surface of the electronic device (i.e., a surface where a battery cover of the electronic device is located).

It should be noted that when the electronic device radiates an NFC signal outward, the NFC chip in the electronic device may actively provide a differential excitation current. When the electronic device serves as an NFC receiver to receive NFC signals radiated by other electronic devices, an antenna device in the electronic device may generate an induced current, where the induced current may also be understood as a differential excitation current provided by the NFC chip or a differential excitation current passively provided by the NFC chip. That is, the NFC chip in the electronic device can provide the differential excitation current regardless of whether the electronic device is used as an NFC transmitter to radiate an NFC signal outwards or as an NFC receiver to receive an NFC signal radiated by another electronic device.

According to the antenna device provided by the embodiment of the application, the two conductor structures are arranged in the antenna device, the two conductor structures are connected to two different grounding points of the same grounding plane, and the ground plane between the two grounding points is utilized to form the conductive path, so that the conductive loop for transmitting the NFC differential excitation current can be formed through the two conductor structures and the conductive path. Because two conductor structures can set up respectively in electronic equipment's different positions according to the demand of electronic equipment inner space design, and then pass through the electrically conductive path that forms on the ground plane connects and forms the return circuit to can realize the design of NFC antenna through the conductor structure cooperation ground plane of electronic equipment different positions, thereby can save the occupation space of NFC antenna, and the overall arrangement of NFC antenna can be more nimble.

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 antenna device 200 further includes a first non-near-field communication chip 25 and a second non-near-field communication chip 26. It is understood that the first non-near-field communication chip 25 and the second non-near-field communication chip 26 may be integrated on the circuit board 30 of the electronic device 100.

The first non-near-field communication chip 25 is configured to provide a first non-near-field communication excitation 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 25 may be a cellular communication chip for providing the cellular network signal; the first non-near-field communication chip 25 may be a Wi-Fi chip for providing the Wi-Fi signals; the first non-near-field communication chip 25 may be a GPS chip for providing the GPS signal; the first non-near-field communication chip 25 may also be a BT chip for providing the BT signal.

The first conductor structure 23 further comprises a third feeding end 233. The third feeding end 233 is disposed at an interval with the first feeding end 231 and the first grounding end 232. The third feeding end 233 is electrically connected to the first non-near-field communication chip 25, and the first non-near-field communication chip 25 is grounded. Thereby, the first non-near-field communication chip 25 may feed the first non-near-field communication excitation signal to the first conductor structure 23 through the third feeding end 233. Thus, the first conductor structure 23 may also be used to transmit the first non-near-field communication excitation signal, wherein the third feeding end 233 and the first grounding end 232 of the first conductor structure 23 partially serve as a first non-near-field communication radiator.

It can be understood that the first conductor structure 23 can be used for transmitting both the differential excitation current provided by the NFC chip 21 and the first non-near-field communication excitation signal provided by the first non-near-field communication chip 25, so that multiplexing of the first conductor structure 23 can be achieved, the number of conductor structures used for transmitting wireless signals in the electronic device 100 can be reduced, and the internal space of the electronic device 100 can 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.

Therefore, in the first conductor structure 23, the distance between the first feeding end 231 and the first ground end 232 is greater than the distance between the third feeding end 233 and the first ground end 232. Thus, in the first conductor structure 23, the length of the radiator for transmitting the NFC signal may be made larger than the length of the radiator for transmitting the first non-near-field communication excitation signal.

In addition, in order to reduce the overall length of the first conductor structure 23, the third feeding terminal 233 may be disposed on the same side of the first grounding terminal 232 as the first feeding terminal 231. That is, the third feeding end 233 is located between the first feeding end 231 and the first grounding end 232. Compared to the third feeding end 233 and the first feeding end 231 being located on different sides of the first ground end 232, the third feeding end 233 and the first feeding end 231 being located on the same side of the first ground end 232 may multiplex a portion between the third feeding end 233 and the first ground end 232, so that the overall length of the first conductor structure 23 may be reduced.

The second non-near-field communication chip 26 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 26 may be a cellular communication chip for providing the cellular network signal; the second non-near-field communication chip 26 may be a Wi-Fi chip for providing the Wi-Fi signals; the second non-near-field communication chip 26 may be a GPS chip for providing the GPS signal; the second non-near-field communication chip 26 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 26 and the first non-near-field communication chip 25 may be the same type of chip or different types of chips.

The second conductor structure 24 further comprises a fourth feeding end 243. The fourth feeding end 243 is spaced apart from the second feeding end 241 and the second grounding end 242. The fourth feeding end 243 is electrically connected to the second non-near-field communication chip 26, and the second non-near-field communication chip 26 is grounded. Thereby, the second non-near-field communication chip 26 may feed the second non-near-field communication excitation signal to the second conductor structure 24 through the fourth feeding end 243. Thus, the second conductor structure 24 may also be used for transmitting the second non-near-field communication excitation signal. Wherein the fourth feeding end 243 and the second grounding end 242 of the second conductor structure 24 partially function as a radiator for the second non-near-field communication.

It can be understood that the second conductor structure 24 can be used for transmitting both the differential excitation current provided by the NFC chip 21 and the second non-near-field communication excitation signal provided by the second non-near-field communication chip 26, so that multiplexing of the second conductor structure 24 can be achieved, the number of conductor structures used for transmitting wireless signals in the electronic device 100 can be further reduced, and the internal space of the electronic device 100 can be further saved.

Similarly, in the second conductor structure 24, the distance between the second feeding end 241 and the second grounding end 242 is greater than the distance between the fourth feeding end 243 and the second grounding end 242. Thus, the length of the radiator for transmitting the NFC signal may be made greater than the length of the radiator for transmitting the second non-near-field communication excitation signal in the second conductor structure 24.

In addition, in order to reduce the overall length of the second conductor structure 24, the fourth feeding end 243 may be disposed on the same side of the second grounding end 242 as the second feeding end 241. That is, the fourth feeding end 243 is located between the second feeding end 241 and the second grounding end 242. Compared with the fourth feeding end 243 and the second feeding end 241 being located on different sides of the second ground end 242, the portion between the fourth feeding end 243 and the second ground end 242 can be multiplexed by the fourth feeding end 243 and the second feeding end 241 being located on the same side of the second ground end 242, so that the overall length of the second conductor structure 24 can be reduced.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating a third structure of an antenna device 200 according to an embodiment of the present application. The antenna device 200 further includes a matching circuit 27 and a filtering circuit 28. 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 matching circuit 27 is electrically connected to a filter circuit, the first feeding terminal 231 of the first conductor structure 23 and the second feeding terminal 241 of the second conductor structure 24. The filter circuit is electrically connected to the first differential signal terminal 211 of the NFC chip 21 and the second differential signal terminal 212 of the NFC chip 21. The matching circuit 27 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 first conductor structure 23, the conductive path on the ground plane 22, and the second conductor structure 24.

The matching circuit 27 includes a first input terminal 27a, a second input terminal 27b, a first output terminal 27c, and a second output terminal 27 d. The first input end 27a and the second input end 27b are electrically connected to a filter circuit 28, the filter circuit is electrically connected to the first differential signal end 211 of the NFC chip 21 and the second differential signal end 212 of the NFC chip 21, the first output end 27c is electrically connected to the first feeding end 231 of the first conductor structure 23, and the second output end 27d is electrically connected to the second feeding end 241 of the second conductor structure 24.

The filter circuit 28 is electrically connected to the first differential signal terminal 211, the second differential signal terminal 212, the first input terminal 27a, and the second input terminal 27 b. The filter circuit 28 is used for filtering a first interference signal between the first differential signal terminal 211 and the first input terminal 27a, and a second interference signal between the second differential signal terminal 212 and the second input terminal 27 b. The first interference signal and the second interference signal include electric signals other than the differential excitation current supplied from the NFC chip 21.

It is understood that the matching circuit 27 may include a circuit formed by any series connection or any parallel connection of capacitors and inductors. The filter circuit 28 may also include a circuit consisting of any series or any parallel connection of capacitors, inductors.

Referring to fig. 6, fig. 6 is a schematic diagram illustrating a fourth structure of the antenna device 200 according to the embodiment of the present application. The matching circuit 27 includes four capacitors C1, C2, C3, and C4, and the capacitors C1, C2, C3, and C4 are all connected in parallel to the NFC chip 21. The filter circuit 28 comprises capacitors C5 and C6, and a capacitor is connected in series between the two branches between the matching circuit 27 and the filter circuit 28.

In an embodiment, if the lengths of the first conductor structure 23 and the second conductor structure 24 in the antenna device are different, the equivalent inductances are different, so that the two conductor structures form resonance at different frequency points, which is not favorable for performance debugging of the NFC antenna. By establishing a simulation software model for simulation, adding a matching circuit after adding an ideal device finds that only a single resonance exists at 13.56 MHz. And when the matching circuit is simulated according to the real object in the application, the selected value of the matching circuit device is consistent with that of the previous simulation, and the simulation result shows that at the moment, one resonance exists at each of 12MHz and 14MHz, and the performance at 13.56MHz is poor. The current distributions at 12.45MHz and 14.9MHz were observed and it was found that the two resonances were formed by two ground branches, respectively. Therefore, in order to solve the above problem, the embodiment of the present application may connect four capacitors in the matching circuit 27 in parallel with the NFC chip 21, and there is only one resonance left at this time without grounding, so that a desired result may be obtained by adjusting the values of the capacitors.

In another embodiment, as shown in fig. 7, the capacitors C1, C2, C3, and C4 are connected in parallel and then grounded, so that the left and right parts of the matching circuit 27 are relatively independent, and therefore, by adjusting the capacitance values of the left and right sides, the two grounded branches can resonate at about 13.56MHz, which not only meets the debugging requirement, but also maintains the board-level circuit of the conventional scheme. Wherein, the capacitor C1 is connected with the C2 in parallel, the capacitor C3 is connected with the C4 in parallel, and the capacitor C1 and the capacitor C2 are connected with the ground, and the capacitor C3 and the capacitor C4 are connected with the ground.

In an embodiment, the matching circuit 27 may further include two capacitors, which are respectively C1 and C2, and are connected in parallel between C1 and C2, as shown in fig. 8, in this embodiment, the capacitor C1 and C2 are grounded, that is, the capacitance values of the capacitors C1 and C2 may be adjusted to make the two ground branches resonate to meet the requirement.

In an embodiment, the matching circuit 27 may further include only one capacitor C1, as shown in fig. 9, in this embodiment, the capacitor C1 is grounded, and in this embodiment, the capacitance value of the capacitor C1 may be adjusted, so that both ground branches resonate at about 13.56MHz, thereby meeting the usage requirement. It should be noted that the number of capacitors in the matching circuit 27 can be flexibly adjusted during actual use.

The filter circuit 28 may include an inductor L1, an inductor L2, a capacitor C5, and a capacitor C6, wherein the inductor L1 is connected in series between the first differential signal terminal 211 and the first matching circuit 271, the inductor L2 is connected in series between the second differential signal terminal 212 and the first matching circuit 271, the capacitor C5 is connected in series with the capacitor C6 and connected in parallel with the NFC chip 21 after being connected in series, and a ground is connected between the capacitor C5 and the capacitor C6.

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:

a ground plane formed with a conductive path;

the matching circuit is electrically connected with the first differential signal end, the second differential signal end, the first feed end and the second feed end so as to match impedance when the conductive loop transmits the differential excitation current, and the matching circuit comprises at least one tuning device which is connected with the near field communication chip in parallel so that the first conductor structure and the second conductor structure have the same resonant frequency.

2. The antenna device according to claim 1, wherein the tuning element comprises at least one capacitor, and wherein the capacitor is connected to ground, and wherein the capacitor is configured to adjust a capacitance value to achieve the same resonant frequency for the first conductor structure and the second conductor structure.

3. The antenna arrangement according to claim 2, characterized in that the tuning component comprises a first and a second capacitance, which are connected to ground, respectively, for achieving the same resonance frequency for the first and the second conductor structure by adjusting the capacitance value.

4. The antenna device according to claim 2, wherein the tuning element comprises a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, the first capacitor and the second capacitor are respectively connected to ground, the third capacitor and the fourth capacitor are respectively connected to ground, and the first capacitor, the second capacitor, the third capacitor and the fourth capacitor are used for realizing that the first conductor structure and the second conductor structure have the same resonance frequency by adjusting capacitance values.

5. The antenna device according to claim 4, wherein the first capacitor and the second capacitor form a first capacitor bank, the third capacitor and the fourth capacitor form a second capacitor bank, and the capacitance values of the first capacitor bank and the second capacitor bank are different.

6. The antenna device of claim 1, wherein the conductive loop, when carrying the differential excitation current, the first conductor structure generates a first near field communication radiation field and the second conductor structure generates a second near field communication radiation field that at least partially overlaps the first near field communication radiation field.

7. The antenna device of claim 1,

the 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 feed end, and the second output end is electrically connected with the second feed end.

8. The antenna device of claim 7, further comprising:

and the filter circuit is electrically connected with the first differential signal end, the second differential signal end, the first input end and the second input end.

9. The antenna device of claim 8,

the filter circuit comprises at least one inductor and at least one capacitor, the at least one inductor is connected between the first differential signal end and the matching circuit and between the second differential signal end and the matching circuit in series, and the at least one capacitor is connected with the near field communication chip in parallel and is grounded.

10. The antenna device of claim 1, further comprising:

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

the first conductor structure further comprises a third feed end and a first ground end, the third feed end is electrically connected with the first non-near-field communication chip, the first ground end is connected with the ground plane, and a part between the third feed end and the first ground end in the first conductor structure is further used for transmitting the first non-near-field communication excitation signal.

11. The antenna device of claim 1, wherein: further comprising:

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

the second conductor structure further comprises a fourth feed end and a second ground end, the fourth feed end is electrically connected with the second non-near-field communication chip, the second ground end is connected with the ground plane, and a part between the fourth feed end and the second ground end in the second conductor structure is further used for transmitting the second non-near-field communication excitation signal.

12. An electronic device, characterized in that it comprises an antenna device according to any one of claims 1 to 11.

13. The electronic device of claim 12, further comprising a circuit board having a printed wiring disposed thereon, wherein the first conductor structure comprises the printed wiring, or wherein the second conductor structure comprises the printed wiring.

14. The electronic device of claim 12, further comprising a flexible circuit board having a metal trace disposed thereon, wherein the first conductor structure comprises the metal trace, or wherein the second conductor structure comprises the metal trace.

15. The electronic device of claim 12, further comprising a middle frame, the middle frame comprising first and second spaced apart metal branches, the first conductor structure comprising the first metal branch, the second conductor structure comprising the second metal branch.