CN114389646A

CN114389646A - Radio frequency module, antenna device and electronic equipment

Info

Publication number: CN114389646A
Application number: CN202011119013.2A
Authority: CN
Inventors: 陈华星
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-10-19
Filing date: 2020-10-19
Publication date: 2022-04-22
Anticipated expiration: 2040-10-19
Also published as: CN114389646B

Abstract

The embodiment of the application discloses a radio frequency module, an antenna device and electronic equipment. When the near field communication chip receives a selection instruction of a radio frequency signal of a first frequency, the antenna selection switch is switched to be connected with the first matching circuit, so that the near field communication chip processes the radio frequency signal of the first frequency, or when the near field communication chip receives a selection instruction of a radio frequency signal of a second frequency, the antenna selection switch is switched to be connected with the second matching circuit, so that the near field communication chip processes the radio frequency signal of the second frequency. The radio frequency module provided by the scheme can process the radio frequency signal of the first frequency or the radio frequency signal of the second frequency by switching the on state of the antenna selection switch, and can improve the integration level of the circuit.

Description

Radio frequency module, antenna device and electronic equipment

Technical Field

The application relates to the technical field of communication, in particular to a radio frequency module, an antenna device and electronic equipment.

Background

Near Field Communication (NFC) is an emerging technology, and devices (such as mobile phones) using NFC technology can exchange data in close proximity, and is evolved by integrating contactless Radio Frequency Identification (RFID) and interconnection technology.

At present, numerous mobile phones and wearable products have the NFC function, and the products with the NFC function are mainly applied to the market such as simulated traffic cards, simulated entrance guard cards and simulated bank cards. In these simulated cards, the bank card and the traffic card are cards with a frequency point of 13.56MHz, but the access card includes not only cards with a frequency point of 13.56MHz but also cards with a frequency point of 125 kHz. And the same electronic device in the related scheme is difficult to simultaneously meet the condition of processing two different frequency points.

Disclosure of Invention

The embodiment of the application provides a radio frequency module, which can improve the circuit integration level.

The embodiment of the application provides the following technical scheme:

a radio frequency module, comprising: the antenna comprises a near field communication chip, an antenna selection switch, a first matching circuit, a second matching circuit, a first antenna and a second antenna;

the antenna selection switch is electrically connected with the near field communication chip, and the near field communication chip is used for processing radio frequency signals of a first frequency and radio frequency signals of a second frequency;

the first matching circuit is electrically connected with the antenna selection switch and the first antenna and is used for matching radio-frequency signals of a first frequency;

the second matching circuit is electrically connected with the antenna selection switch and the second antenna, and is used for matching radio-frequency signals of a second frequency;

the first antenna is used for transmitting radio frequency signals of a first frequency;

the second antenna is used for transmitting radio frequency signals of a second frequency;

when the near field communication chip receives a selection instruction of a radio frequency signal of a first frequency, the antenna selection switch is switched to be connected with the first matching circuit, so that the near field communication chip processes the radio frequency signal of the first frequency;

when the near field communication chip receives a selection instruction of a radio frequency signal of a second frequency, the antenna selection switch is switched to be connected with the second matching circuit, so that the near field communication chip processes the radio frequency signal of the second frequency.

The embodiment of the application also provides an antenna device which comprises the radio frequency module.

The embodiment of the application further provides an electronic device, which comprises a shell and a circuit board, wherein the circuit board is installed inside the shell, a radio frequency module is arranged on the circuit board, and the radio frequency module is the radio frequency module.

The embodiment of the application provides a radio frequency signal switching method, which is applied to the radio frequency module, wherein the radio frequency module comprises a near field communication chip, an antenna selection switch, a first matching circuit, a second matching circuit, a first antenna and a second antenna, and the method comprises the following steps:

acquiring a frequency selection instruction;

when the frequency selection instruction is a selection instruction of a radio frequency signal with a first frequency, controlling the antenna selection switch to be switched to be connected with the first matching circuit, and processing the radio frequency signal with the first frequency;

and when the frequency selection instruction is a selection instruction of a radio frequency signal with a second frequency, controlling the antenna selection switch to be switched to be connected with the second matching circuit, and processing the radio frequency signal with the second frequency.

When the near field communication chip receives a selection instruction of a radio frequency signal of a first frequency, the antenna selection switch is switched to be connected with the first matching circuit, so that the near field communication chip processes the radio frequency signal of the first frequency, or when the near field communication chip receives a selection instruction of a radio frequency signal of a second frequency, the antenna selection switch is switched to be connected with the second matching circuit, so that the near field communication chip processes the radio frequency signal of the second frequency. The radio frequency module provided by the scheme can process the radio frequency signal of the first frequency or the radio frequency signal of the second frequency by switching the on state of the antenna selection switch, and because the near field communication chip provided by the scheme has the capability of simultaneously processing the radio frequency signal of the first frequency and the radio frequency signal of the second frequency, compared with the scheme that a plurality of mutually independent chips are adopted to process the radio frequency signals of different frequencies respectively in the related art, the integration level of the circuit can be improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

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

Fig. 2 is a schematic view of a first structure of a radio frequency module according to an embodiment of the present disclosure.

Fig. 3 is a schematic view of a second structure of the rf module according to an embodiment of the present disclosure.

Fig. 4 is a schematic structural diagram of a near field communication chip provided in an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a radio frequency module according to an embodiment of the present application.

Fig. 6 is an overall hardware architecture in an application scenario provided by an embodiment of the present application.

Fig. 7 is another schematic structural diagram of an electronic device according to an embodiment of the present application.

Fig. 8 is a flowchart illustrating a method for switching a radio frequency signal 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 inventive step, are within the scope of the present application.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The embodiment of the application provides electronic equipment. The electronic device can be a smart phone, a tablet computer, a palm computer, a notebook computer, a desktop computer or other devices. Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure. The electronic device 10 includes a display 11, a bezel 12, a circuit board 13, a power supply 14, and a housing 15.

Wherein the display screen 11 is mounted on the housing 15 to form a display surface of the electronic device 10. The display 11 serves as a front housing of the electronic device 10, and forms an accommodating space with the housing 15 for accommodating other electronic components or functional components of the electronic device 10. Meanwhile, the display screen 11 forms a display surface of the electronic device 10 for displaying information such as images, texts, and the like. The Display screen 11 may be a Liquid Crystal Display (LCD) or an Organic Light-Emitting Diode (OLED) Display screen. Functional components such as a camera and an ambient light sensor in the electronic device 10 may be hidden under the display screen 11.

In some embodiments, a glass cover plate may be disposed over the display screen 11. The glass cover plate may cover the display screen 11 to protect the display screen 11 and prevent the display screen 11 from being scratched or damaged by water.

The middle frame 12 may have a thin plate-like or sheet-like structure, or may have a hollow frame structure. The middle frame 12 can be accommodated in the accommodating space formed by the display panel 11 and the housing 15. The middle frame 12 is used for providing a supporting function for the electronic components or functional modules in the electronic device 10, so as to mount the electronic components or functional modules in the electronic device together. For example, functional components such as a camera, a receiver, a circuit board, and a battery in the electronic apparatus may be mounted on the center frame 12 for fixation. In some embodiments, the material of the middle frame 12 may include metal or plastic.

The circuit board 13 is mounted inside the housing space. For example, the circuit board 13 may be mounted on the middle frame 12 and accommodated in the accommodating space together with the middle frame 12. The circuit board 13 may be a motherboard of the electronic device 10. The circuit board 13 is provided with a grounding point to realize grounding of the circuit board 13. One, two or more of the functional components such as a motor, a microphone, a speaker, a receiver, an earphone interface, a universal serial bus interface (USB interface), a camera, a distance sensor, an ambient light sensor, a gyroscope, and a processor may be integrated on the circuit board 13. Meanwhile, the display screen 11 may be electrically connected to the circuit board 13.

In some embodiments, display control circuitry is provided on the circuit board 13. The display control circuit outputs an electric signal to the display screen 11 to control the display screen 11 to display information.

In some embodiments, Radio Frequency (RF) circuitry may be disposed on the circuit board 13. The radio frequency module can communicate with a network device (e.g., a server, a base station, etc.) or other electronic devices (e.g., a smart phone, etc.) through a wireless network to complete information transceiving with the network device or other electronic devices.

The power supply 14 is installed inside the accommodating space. For example, the power source 14 may be mounted on the middle frame 12 and be accommodated in the accommodating space together with the middle frame 12. The power source 14 may be electrically connected to the circuit board 13 to enable the power source 14 to power the electronic device 10. Wherein, the circuit board 13 may be provided with a power management circuit. The power management circuit is used to distribute the voltage provided by the power source 14 to the various electronic components in the electronic device 10.

The housing 15 is used to form the outer contour of the electronic device 10. The housing 15 may be integrally formed. In the molding process of the housing 15, structures such as a rear camera hole and a fingerprint identification module mounting hole can be formed on the housing 15.

In some embodiments, as shown in fig. 2, the rf module 20 includes a nfc chip 30, an antenna selection switch 40, a first matching circuit 50, a second matching circuit 60, a first antenna 70, and a second antenna 80, which are connected in sequence.

And the near field communication chip 30 is electrically connected with the antenna selection switch 40, and the near field communication chip 30 is used for processing the radio frequency signal of the first frequency and the radio frequency signal of the second frequency. Wherein, the frequency of the radio frequency signal of the first frequency can be 13.56MHz, and the frequency of the radio frequency signal of the second frequency can be 125 kHz.

The antenna selection switch 40 is selectively electrically connected to the first matching circuit 50 and the second matching circuit 60, and is used for switching the operating state of the rf module.

The first matching circuit 50 is electrically connected to the first antenna 70, and the first matching circuit 50 is configured to perform matching processing on the radio frequency signal of the first frequency to match the first antenna 70.

The second matching circuit 60 is electrically connected to the second antenna 80, and the second matching circuit 60 is configured to perform matching processing on the radio frequency signal of the second frequency, and perform matching with the first antenna 80.

The first antenna 70 is used to transmit radio frequency signals at a first frequency.

The second antenna 80 is used to transmit radio frequency signals at a second frequency.

When the near field communication chip 30 receives a selection instruction of a radio frequency signal of a first frequency, the antenna selection switch 40 is switched to be connected with the first matching circuit 50, so that the near field communication chip 30 processes the radio frequency signal of the first frequency. When the near field communication chip 30 receives a selection instruction of the radio frequency signal of the second frequency, the antenna selection switch 40 is switched to be connected with the second matching circuit 60, so that the near field communication chip 30 processes the radio frequency signal of the second frequency.

As can be seen from the above, the near field communication chip provided in the embodiment of the present application has the capability of processing the radio frequency signal of the first frequency and the radio frequency signal of the second frequency at the same time, and compared with a scheme in which a plurality of mutually independent chips are used to process the radio frequency signals of different frequencies, the scheme can improve the integration level of the circuit.

In some embodiments, as shown in fig. 3, the near field communication chip 30 includes a receiving port 31 and a transmitting port 32, and the antenna selection switch 40 includes a first input 41, a second input 42, a first output 43, a second output 44, a third output 45, and a fourth output 46.

The receiving port 31 is used for receiving a radio frequency signal (a downstream signal). The transmission port 32 is used for transmitting radio frequency signals (upstream signals).

The receiving port 31 is electrically connected to the first input 41, and the transmitting port 32 is electrically connected to the second input 42. The first output terminal 43 and the third output terminal 45 are electrically connected to the first matching circuit 50. The second output terminal 44 and the fourth output terminal 46 are electrically connected to the second matching circuit 60.

When the antenna selection switch 40 is switched to the first input terminal 41 and the first output terminal 43 to be turned on, the first matching circuit 50 and the first antenna 70 are connected to the present circuit, and at this time, the near field communication chip 30 performs receiving processing on the radio frequency signal of the first frequency through the first antenna 70.

When the antenna selection switch 40 is switched to the first input terminal 41 and the second output terminal 44 to be turned on, the second matching circuit 60 and the second antenna are connected to the present circuit, and at this time, the near field communication chip 30 performs receiving processing on the radio frequency signal of the second frequency through the second antenna 80.

When the antenna selection switch 40 is switched to the second input end 42 and the third output end 45 to be turned on, the first matching circuit 50 and the first antenna 70 are connected to the current circuit, and at this time, the near field communication chip 30 performs transmission processing on the radio frequency signal of the first frequency through the first antenna 70.

When the antenna selection switch 40 is switched to the second input terminal 42 and the fourth output terminal 46 to be connected, the second matching circuit 60 and the second antenna are connected to the present circuit, and at this time, the near field communication chip 30 performs transmission processing on the radio frequency signal of the second frequency through the second antenna 80.

In some embodiments, as shown in fig. 4, the near field communication chip 30 further includes a processor 320, a clock signal selection switch 310, a first phase-locked loop 301, and a second phase-locked loop 302.

The processor 320 is electrically connected to the clock signal selection switch 310.

The clock signal selection switch 310 is selectively electrically connected to the first phase-locked loop 301 and the second phase-locked loop 302.

When the processor 320 receives a selection instruction of the radio frequency signal of the first frequency, the processor 320 controls the clock selection switch 310 to be connected with the first phase-locked loop 301, so that the near field communication chip 30 processes the radio frequency signal of the first frequency;

when the processor 320 receives the selection instruction of the radio frequency signal of the second frequency, the processor 320 controls the clock selection switch 310 to be connected with the second phase-locked loop 302, so that the near field communication chip processes the radio frequency signal of the second frequency.

In one embodiment, the processor 320 controls the antenna selection switch 40 to switch to connect with the first matching circuit, so as to identify the rf signals in the surrounding environment;

if the radio frequency signal in the surrounding environment is identified to be the radio frequency signal of the first frequency, the current connection state is kept, and the radio frequency signal of the first frequency is processed;

if the radio frequency signal of the first frequency is not identified, controlling the antenna selection switch 40 to be switched to be connected with the second matching circuit, and identifying the radio frequency signal in the surrounding environment;

and if the radio frequency signal in the surrounding environment is identified to be the radio frequency signal of the second frequency, keeping the current on state, and processing the radio frequency signal of the second frequency.

In an embodiment, the first phase-locked loop 301 and the second phase-locked loop 302 may implement different frequency outputs through respective frequency division/multiplication circuits, for example, the final output frequency of the first phase-locked loop 301 may be 13.56MHz, and the final output frequency of the second phase-locked loop 302 may be 125 kHz.

In some embodiments, referring to fig. 4 as well, the signal receiving circuit of the near field communication chip 30 further includes a first decoder 331, a second decoder 332, analog-to-

digital converters

341 and 342,

mixers

361 and 362, and Gain Control circuits (AGC) 371 and 372.

The first decoder 331 and the second decoder 332 are electrically connected to the processor 320, respectively, and the first decoder 331 is configured to decode the received radio frequency signal of the first frequency. Wherein the first frequency may be 13.56MHz, the first decoder 331 may decode based on ISO14443 or NFC Forum standard. The second decoder 332 is used for decoding the received radio frequency signal of the second frequency. Wherein the second frequency may be 125kHz, the second decoder 332 may decode based on the ISO/IEC 18000 standard.

The analog-to-digital converter 341 is electrically connected to the first decoder 331 and the second decoder 332, and the analog-to-digital converter 342 is electrically connected to the first decoder 331 and the second decoder 332. The analog-to-digital converter 341 and the analog-to-digital converter 342 can process the radio frequency signal of the same frequency at the same time. The analog-to-digital converter converts the received analog signal into a digital signal.

The mixer 361 is electrically connected to the analog-to-digital converter 341, the mixer 362 is electrically connected to the analog-to-digital converter 362, and the mixer is used for frequency conversion.

The gain control circuit 371 is electrically connected to the mixer 361, the gain control circuit 372 is electrically connected to the mixer 362, and the gain control circuit is used for automatic gain control, and performs automatic gain control on the received radio frequency signal according to the magnitude of the semaphore.

The clock signal selection switch 310 is electrically connected to the mixer 361 and the mixer 362, and is used for synchronizing the carrier signal of the received signal.

In some embodiments, referring to fig. 4 as well, the signal transmitting circuit of the nfc chip 30 further includes a first encoder 333, a second encoder 334, digital-to-

analog converters

343 and 345, a Pulse Width Modulation and clock (PWM/CLK) 350,

mixers

363 and 364, and dual-

frequency signal amplifiers

381 and 382.

The first encoder 333 and the second encoder 334 are electrically connected to the processor 320, respectively. The first encoder 333 is used to encode the radio frequency signal of the first frequency to be transmitted, and the first encoder 333 may be based on ISO14443 or NFC Forum standard. The second decoder 334 is used to encode the radio frequency signal of the second frequency to be transmitted, and the second decoder 334 may be encoded based on the ISO/IEC 18000 standard.

The digital-to-analog converter 343 is electrically connected to the first encoder 333 and the second encoder 334, and the digital-to-analog converter 345 is electrically connected to the first encoder 333 and the second encoder 334. The digital-to-analog converter 343 and the digital-to-analog converter 345 can process the rf signal of the same frequency at the same time. The digital-to-analog converter converts the digital signal into a transmittable analog signal.

The mixer 363 is electrically connected to the digital-to-analog converter 343, the mixer 364 is electrically connected to the digital-to-analog converter 345, and the mixer is used for frequency conversion.

The dual-frequency signal amplifier 381 is electrically connected to the mixer 363, the dual-frequency signal amplifier 382 is electrically connected to the mixer 364, and the dual-frequency signal amplifier amplifies and outputs the output signal, and has the above-described amplification function for the radio frequency signal of the first frequency and the radio frequency signal of the second frequency.

The clock signal selection switch 310 is electrically connected to the

mixers

363 and 364 for synchronizing the carrier signals of the transmission signals.

In some embodiments, as shown in fig. 5, fig. 5 is a schematic view of a more detailed radio frequency module according to an embodiment of the present disclosure.

When the processor 320 receives a selection instruction of the radio frequency signal of the first frequency, the processor 320 controls the antenna selection switch 40 to switch the first input terminal 41 to be connected with the first output terminal 43, at this time, the antenna selection switch 40 is connected with the first matching circuit 50, and the first matching circuit 50 performs matching processing on the radio frequency signal of the first frequency to match with the first antenna 70. Meanwhile, the processor 320 controls the clock selection switch 310 to be turned on with the first phase-locked loop 301, and then performs corresponding transmission processing on the rf signal of the first frequency through the signal receiving circuit, so that the rf module 20 performs receiving processing on the rf signal of the first frequency.

When the processor 320 receives a selection instruction of the radio frequency signal of the first frequency, the processor 320 controls the antenna selection switch 40 to switch to the second input end 42 and the third output end 45 to be connected, at this time, the antenna selection switch 40 is connected with the first matching circuit 50, and the first matching circuit 50 performs matching processing on the radio frequency signal of the first frequency to match with the first antenna 70. Meanwhile, the processor 320 controls the clock selection switch 310 to be connected to the first phase-locked loop 301, and then performs corresponding transmission processing on the radio frequency signal of the first frequency through the signal transmitting circuit, so that the radio frequency module 20 performs transmission processing on the radio frequency signal of the first frequency.

When the processor 320 receives a selection instruction of the radio frequency signal of the second frequency, the processor 320 controls the antenna selection switch 40 to switch to the first input terminal 41 to be connected with the second output terminal 44, at this time, the antenna selection switch 40 is connected with the second matching circuit 60, and the second matching circuit 60 performs matching processing on the radio frequency signal of the second frequency to match with the second antenna 80. Meanwhile, the processor 320 controls the clock selection switch 310 to be connected to the second phase-locked loop 302, and then performs corresponding transmission processing on the rf signal of the second frequency through the signal receiving circuit, so that the rf module 20 performs receiving processing on the rf signal of the second frequency.

When the processor 320 receives the selection instruction of the radio frequency signal of the second frequency, the processor 320 controls the antenna selection switch 40 to switch to the second input end 42 to be connected with the fourth output end 46, at this time, the antenna selection switch 40 is connected with the second matching circuit 60, and the second matching circuit 60 performs matching processing on the radio frequency signal of the second frequency to match with the second antenna 80. Meanwhile, the processor 320 controls the clock selection switch 310 to be connected to the second phase-locked loop 302, and then performs corresponding transmission processing on the radio frequency signal of the second frequency through the signal transmitting circuit, so that the radio frequency module 20 performs transmission processing on the radio frequency signal of the second frequency.

In an embodiment, not shown, the rf module 20 may further include a Low Pass Filter (LPF) disposed between the nfc chip and the antenna selection switch, the LPF being used for filtering out high frequency signals and generally setting a cut-off frequency around 16 MHz.

In some embodiments, as shown in fig. 6, an overall hardware architecture of the radio frequency module provided in this embodiment in an actual application scenario may be as shown in fig. 6, where the overall hardware architecture mainly includes a power Management unit 100, that is, a pmu (power Management unit), an application processor 90, that is, an ap (application processor), a near field communication chip 30, an antenna selection switch 40, a first matching circuit 50, a second matching circuit, a first antenna 70, and a second antenna 80, which form two sets of frequency point (a first frequency and a second frequency) systems.

The work of the two frequency point systems is managed by the application processor 90 and the near field communication chip 30 in a unified way, the power management unit 100 is responsible for providing power and clocks, the application processor 90 is a main processor of the mobile phone and is responsible for carrying out data communication with the near field communication chip, processing event information reported by the near field communication chip 30 and controlling the near field communication chip 30 to be turned on or off, and the near field communication chip 30 is responsible for carrying out functions of gain control, power amplification, analog-to-digital conversion, digital-to-analog conversion, coding and decoding and the like on radio frequency signals. Of the two sets of network matching circuits and antennas, the first matching circuit 50 and the first antenna 70 are used for processing radio frequency signals at a first frequency. The second matching circuit 60 and the second antenna 80 are for processing radio frequency signals at a second frequency. The two sets of network matching circuits and antennas are selected by an antenna selection switch 40, which is controlled by the near field communication chip 30.

Wherein, the frequency of the radio frequency signal of the first frequency can be 13.56MHz, and the frequency of the radio frequency signal of the second frequency can be 125 kHz.

For example, referring to fig. 5 and fig. 6, when the near field communication chip 30 needs to operate at 13.56MHz, the application processor 90 issues a command of selecting 13.56MHz in rf frequency to the near field communication chip 30, and after receiving the selection command, the near field communication chip 30 first switches the clock signal selection switch 310 to the first phase-locked loop 301, outputs 13.56MHz to the rf signal transmitting circuit and the rf signal receiving circuit, then selects to receive the decoded signal of the first decoder 331, selects to transmit the signal from the first encoder 333, and simultaneously switches the antenna selection switch 30 to the first matching circuit 50 and the first antenna path 60.

For example, referring to fig. 5 and fig. 6 as well, when the near field communication chip 30 needs to operate at 125kHz, the application processor 90 issues a command of selecting 125kHz to the near field communication chip 30, and after the near field communication chip 30 receives the selection command, the clock signal selection switch 310 is first switched to the second phase-locked loop 302, and outputs 125kHz to the rf transmitting circuit and the receiving path, and then selects to receive the decoded signal of the second decoder 332 and selects to transmit the signal from the second encoder 334, and at the same time, the antenna selection switch 30 is switched to the second matching circuit 50 and the second antenna 80 path.

To sum up, the scheme that this application embodiment provided can realize single-chip dual-frenquency point work, for the scheme of present multicore piece, the transformation cost is little, and the integrated level is high, and it is also less to occupy the printed circuit board area.

In some embodiments, as shown in fig. 7, fig. 7 is another schematic structural diagram of the electronic device 10 provided in the embodiments of the present application. The electronic device 10 comprises an antenna arrangement 16, a memory 17, a display unit 19, a power supply 14 and a processor 18. Those skilled in the art will appreciate that the configuration of the electronic device 10 shown in FIG. 7 does not constitute a limitation of the electronic device 10. The electronic device 10 may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.

The antenna device 16 includes the rf module 20 described in any of the above embodiments. The antenna device 16 can communicate with a network device (e.g., a server) or other electronic devices (e.g., a smart phone) through a wireless network, and perform information transceiving with the network device or other electronic devices.

The memory 17 may be used to store applications and data. The memory 17 stores an application program containing executable program code. The application programs may constitute various functional modules. The processor 18 executes various functional applications and data processing by running the application program stored in the memory 17.

The display unit 19 may be used to display information input to the electronic device 10 by the user or information provided to the user, as well as various graphical user interfaces of the electronic device 10. These graphical user interfaces may be made up of graphics, text, icons, video, and any combination thereof. The display unit 19 may include a display panel.

The power supply 14 is used to power the various components of the electronic device 10. In some embodiments, the power supply 14 may be logically coupled to the processor 18 through a power management system, such that functions to manage charging, discharging, and power consumption management are performed by the power management system.

The processor 18 is the control center of the electronic device 10. The processor 18 connects various parts of the overall electronic device 10 using various interfaces and lines, performs various functions of the electronic device 10 and processes data by running or executing application programs stored in the memory 17 and calling up data stored in the memory 17, thereby performing overall monitoring of the electronic device 10.

In addition, the electronic device 10 may further include a camera module, a bluetooth module, and the like, which will not be described in detail herein.

An embodiment of the present application further provides a method for switching a radio frequency signal, where an execution main body of the method for switching a radio frequency signal may be the antenna apparatus provided in the embodiment of the present application, or an electronic device integrated with the antenna apparatus, where the antenna apparatus may be implemented in a hardware or software manner. The electronic device may be a smart phone, a tablet computer, a palm computer, a notebook computer, or a desktop computer.

Referring to fig. 8, fig. 8 is a schematic flowchart illustrating a method for switching a radio frequency signal according to an embodiment of the present disclosure. The specific process of the radio frequency signal switching method provided by the embodiment of the application can be as follows:

101. a frequency selection instruction is obtained.

The frequency selection instruction refers to a selection instruction of an operating frequency of the rf module, for example, the rf module can operate at 13.56MHz or 125kHz as required, and the frequency selection instruction is used to select the operating frequency of the rf module.

Generally, scenes with 13.56MHz frequency points are used in many cases, for example, in the field of public transportation and the field of bank cards, card frequency points are 13.56MHz, and a card with 125kHz frequency points is used in the field of entrance guard.

In some embodiments, the radio frequency signals in the surrounding environment can be identified by controlling the antenna selection switch to be switched to be connected with the first matching circuit;

if the radio frequency signal of the first frequency is not identified, controlling the antenna selection switch to be switched to be communicated with the second matching circuit, and identifying the radio frequency signal in the surrounding environment;

For example, in a scenario of entering an access card, a radio frequency module is required to determine a frequency point used in a current scenario. At the moment, the radio frequency module can poll the frequency points of 13.56MHz and 125kHz, namely, the connection state of the antenna selection switch and different matching circuits is changed, and after a card with a certain frequency point is identified, the frequency point is not changed any more until the card is moved.

When a user enters an entity access control card for the first time, the user can mark the card with a corresponding frequency point, and the marking method can be to increase the characteristic value parameter of the card, for example, the characteristic value parameter is set to be 1 for a card with a frequency point of 13.56MHz, and the characteristic value parameter is set to be 0 for a card with a frequency point of 125 kHz.

When a user performs card simulation action, the radio frequency channels with different frequency points can be called according to the frequency point characteristic value parameters of the previously recorded access control card. For example, when the rf module identifies that the current frequency characteristic parameter is 1, the rf channel with the operating frequency of 13.56MHz is called. For another example, when the rf module identifies that the current frequency characteristic parameter is 0, the rf channel with the operating frequency of 125kHz is called.

102. When the frequency selection instruction is a selection instruction of the radio frequency signal of the first frequency, the antenna selection switch is controlled to be switched to be connected with the first matching circuit, and the radio frequency signal of the first frequency is processed.

For example, when the frequency selection command is 13.56MHz, the antenna selection switch is switched to the first matching circuit and the first antenna path. At this time, the rf module operates at an operating frequency of 13.56MHz to receive and transmit corresponding rf signals.

103. And when the frequency selection instruction is a selection instruction of the radio-frequency signal of the second frequency, controlling the antenna selection switch to be switched to be connected with the second matching circuit, and processing the radio-frequency signal of the second frequency.

For example, when the frequency selection instruction is 125kHz, the antenna selection switch is switched to the second matching circuit and the second antenna path. At this time, the rf module operates at an operating frequency of 125kHz to receive and transmit corresponding rf signals.

In particular implementation, the present application is not limited by the execution sequence of the described steps, and some steps may be performed in other sequences or simultaneously without conflict.

As can be seen from the above, the method for switching radio frequency signals provided in the embodiment of the present application may obtain the frequency selection instruction, control the antenna selection switch to be switched to be connected to the first matching circuit to process the radio frequency signals of the first frequency when the frequency selection instruction is the selection instruction of the radio frequency signals of the first frequency, and control the antenna selection switch to be switched to be connected to the second matching circuit to process the radio frequency signals of the second frequency when the frequency selection instruction is the selection instruction of the radio frequency signals of the second frequency. According to the switching method of the radio frequency signals, the radio frequency signals of the first frequency or the radio frequency signals of the second frequency can be processed through the switching-on state of the antenna selection switch in the radio frequency module, and as the near field communication chip provided by the scheme has the capability of simultaneously processing the radio frequency signals of the first frequency and the radio frequency signals of the second frequency, compared with the scheme that a plurality of mutually independent chips are adopted to respectively process the radio frequency signals of different frequencies in the related technology, the integration level of a circuit can be improved.

An embodiment of the present application further provides a storage medium, where a computer program is stored in the storage medium, and when the computer program runs on a computer, the computer executes the radio frequency signal switching method according to any of the above embodiments.

It should be noted that, all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a computer program, which may be stored in a computer-readable storage medium, which may include, but is not limited to: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.

Furthermore, the terms "first", "second", and "third", etc. in this application are used to distinguish different objects, and are not used to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to only those steps or modules listed, but rather, some embodiments may include other steps or modules not listed or inherent to such process, method, article, or apparatus.

The near field communication chip, the radio frequency module, the antenna device, the electronic device, and the method for switching the radio frequency signal provided in the embodiments of the present application are described in detail above, and specific examples are applied in the description to explain the principles and embodiments of the present application, and the description of the above embodiments is only used to help 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. A radio frequency module, comprising: the antenna comprises a near field communication chip, a first antenna, a second antenna, an antenna selection switch, a first matching circuit and a second matching circuit;

the near field communication chip is electrically connected with the antenna selection switch and is used for processing radio frequency signals of a first frequency and radio frequency signals of a second frequency;

the first antenna is used for transmitting radio frequency signals of the first frequency;

the second antenna is used for transmitting the radio frequency signal of the second frequency;

the first matching circuit is electrically connected with the antenna selection switch and the first antenna, and is used for matching the radio-frequency signal of the first frequency;

the second matching circuit is electrically connected with the antenna selection switch and the second antenna, and is used for matching the radio-frequency signal of the second frequency;

when the near field communication chip receives a selection instruction of the radio frequency signal of the first frequency, the antenna selection switch is switched to be connected with the first matching circuit, and the near field communication chip processes the radio frequency signal of the first frequency;

when the near field communication chip receives a selection instruction of the radio frequency signal of the second frequency, the antenna selection switch is switched to be connected with the second matching circuit, and the near field communication chip processes the radio frequency signal of the second frequency.

2. The radio frequency module of claim 1, wherein the near field communication chip comprises a receive port and a transmit port, and the antenna selection switch comprises a first input, a second input, a first output, a second output, a third output, and a fourth output;

the receiving port is electrically connected with the first input end;

the transmitting port is electrically connected with the second input end;

the first output end and the third output end are electrically connected with the first matching circuit;

the second output end and the fourth output end are electrically connected with the second matching circuit;

when the antenna selection switch is switched to the first input end and is connected with the first output end, the near field communication chip receives and processes the radio frequency signal with the first frequency;

when the antenna selection switch is switched to the second input end and is connected with the third output end, the near field communication chip transmits the radio frequency signal with the first frequency;

when the antenna selection switch is switched to the first input end and is connected with the second output end, the near field communication chip receives and processes the radio frequency signal of the second frequency;

when the antenna selection switch is switched to the second input end to be connected with the fourth output end, the near field communication chip transmits the radio-frequency signal with the second frequency.

3. The radio frequency module of claim 2, wherein the near field communication chip further comprises a processor, a clock signal selection switch, a first phase locked loop, a second phase locked loop, the clock signal selection switch being selectively electrically connected to the first phase locked loop and the second phase locked loop;

when the processor receives a selection instruction of a radio frequency signal of a first frequency, the processor controls the clock selection switch to be connected with the first phase-locked loop, so that the near field communication chip processes the radio frequency signal of the first frequency;

when the processor receives a selection instruction of a radio frequency signal of a second frequency, the processor controls the clock selection switch to be connected with the second phase-locked loop, so that the near field communication chip processes the radio frequency signal of the second frequency.

4. The radio frequency module of claim 3, wherein the processor is further configured to:

controlling the antenna selection switch to be switched to be connected with the first matching circuit, and identifying the radio frequency signals in the surrounding environment;

if the radio frequency signal of the first frequency is not identified, controlling the antenna selection switch to be switched to be connected with the second matching circuit, and identifying the radio frequency signal in the surrounding environment;

5. The radio frequency module of claim 3, wherein the near field communication chip further comprises:

and the pulse width modulator is electrically connected with the clock selection switch and has carrier output capability of a radio frequency signal with a first frequency and a radio frequency signal with a second frequency.

6. The radio frequency module of claim 5, wherein the near field communication chip further comprises:

and the dual-frequency signal amplifier is electrically connected with the pulse width modulator and is used for amplifying and outputting the radio-frequency signals of the first frequency and the second frequency.

7. The radio frequency module of claim 6, wherein the radio frequency module further comprises:

the low-pass filter is arranged between the near field communication chip and the antenna selection switch and is used for filtering high-frequency signals.

8. The RF module of any one of claims 1-7, wherein the RF signal of the first frequency has a frequency of 13.56MHz and the RF signal of the second frequency has a frequency of 125 kHz.

9. An antenna device, characterized in that the antenna device comprises the radio frequency module of any of claims 1 to 8.

10. An electronic device, comprising a housing and a circuit board, wherein the circuit board is mounted inside the housing, and a radio frequency module is disposed on the circuit board, and the radio frequency module is the radio frequency module according to any one of claims 1 to 8.

11. A method for switching a radio frequency signal, applied to the radio frequency module according to any one of claims 1 to 8, the method comprising:

acquiring a frequency selection instruction;

12. The method for switching a radio frequency signal according to claim 11, further comprising: