CN117134744A - Tuning circuit, radio frequency circuit and electronic equipment - Google Patents

Abstract

The embodiment of the application discloses a tuning circuit, a radio frequency circuit and electronic equipment. The tuning circuit includes: the first inductor comprises a second input end and a second output end, the second input end is connected with the first output end, and the second output end is connected with the antenna radiator; the first tuning module is connected with the first input end and the first output end; the second tuning module is connected with the second input end and the second output end; the third tuning module and the fourth tuning module are connected in parallel between the first output end and the second input end; the first tuning module, the second tuning module, the third tuning module and the fourth tuning module are used for outputting radio frequency signals in different frequency ranges to the antenna radiator. By switching the tuning module, radio frequency signals in various frequency ranges can be radiated on one antenna, so that the number of antennas of the electronic equipment is reduced.

Description

Tuning circuit, radio frequency circuit and electronic equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a tuning circuit, a radio frequency circuit, and an electronic device.

Background

In the prior art, an antenna is required for the electronic device to transmit or receive electromagnetic waves. Application scenes such as radio communication, broadcasting, television, radar, navigation and the like all need to transmit information by using electromagnetic waves. With the iterative development of communication technology, antennas need to carry signals in more and more frequency bands, and each frequency band needs to be provided with a corresponding antenna, so that the number of antennas required to be provided on electronic equipment is increased.

As the number of antennas of the electronic device increases, the isolation between the antennas is low, interference between different antennas can occur, the radiation performance of the antennas is reduced, and finally the communication quality of the electronic device is reduced.

Disclosure of Invention

The embodiment of the application provides a tuning circuit, a radio frequency circuit and electronic equipment.

In a first aspect, a tuning circuit provided in an embodiment of the present application includes:

the first capacitor comprises a first input end and a first output end, and the first input end of the first capacitor is connected with the signal source;

the first inductor comprises a second input end and a second output end, the second input end is connected with the first output end, and the second output end is connected with the antenna radiator;

the first tuning module is connected with the first input end and the first output end;

the second tuning module is connected with the second input end and the second output end;

the third tuning module and the fourth tuning module are connected in parallel between the first output end and the second input end;

the first tuning module, the second tuning module, the third tuning module and the fourth tuning module are used for outputting radio frequency signals in different frequency ranges to the antenna radiator.

In a second aspect, an embodiment of the present application provides a radio frequency circuit, including a signal source, a tuning circuit, and an antenna radiator, where the signal source is configured to generate a radio frequency signal;

the tuning circuit is used for tuning the radio frequency signal, and the tuning circuit is provided by the embodiment of the application;

the antenna radiator is used for transmitting the tuned radio frequency signals to the outside.

In a third aspect, an embodiment of the present application provides an electronic device, including a housing and a radio frequency circuit disposed inside the housing, where the radio frequency circuit is a radio frequency circuit provided by the embodiment of the present application.

The tuning circuit provided by the embodiment of the application comprises: the first inductor comprises a second input end and a second output end, the second input end is connected with the first output end, and the second output end is connected with the antenna radiator; the first tuning module is connected with the first input end and the first output end; the second tuning module is connected with the second input end and the second output end; the third tuning module and the fourth tuning module are connected in parallel between the first output end and the second input end; the first tuning module, the second tuning module, the third tuning module and the fourth tuning module are used for outputting radio frequency signals in different frequency ranges to the antenna radiator.

According to the embodiment of the application, the tuning circuit is formed by arranging the plurality of tuning modules on the antenna, and the tuning modules are switched by the switch, so that the radio frequency signals in various frequency ranges can be radiated on one antenna, the number of the antennas needing to be arranged inside the electronic equipment is reduced, and the communication quality of the electronic equipment is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

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

Fig. 2 is a schematic circuit diagram of a radio frequency circuit according to an embodiment of the present application.

Fig. 3 is a circuit schematic diagram of a first tuning module according to an embodiment of the present application.

Fig. 4 is a circuit schematic diagram of a second tuning module according to an embodiment of the present application.

Fig. 5 is a circuit schematic diagram of a third tuning module according to an embodiment of the present application.

Fig. 6 is a circuit schematic diagram of a fourth tuning module according to an embodiment of the present application.

Fig. 7 is a graph of reflection coefficient of an antenna 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 accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.

In the description of the present application, terms such as "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining a term "first," "second," etc. may include one or more of the stated feature, either explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

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

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

The electronic device 100 includes a display 40, a housing 50, a circuit board 60, and a battery 70.

The display 40 is disposed on the housing 50 to form a display surface of the electronic device 100, and is used for displaying information such as images and texts. The display screen 40 may include a liquid crystal display (Liquid Crystal Display, LCD) or an Organic Light-Emitting Diode (OLED) display, or the like.

It will be appreciated that the display 40 may include a display surface and a non-display surface opposite the display surface. The display surface is the surface of the display 40 facing the user, i.e. the surface of the display 40 visible to the user on the electronic device 100. The non-display surface is a surface of the display 40 facing the interior of the electronic device 100. The display surface is used for displaying information, and the non-display surface is not used for displaying information.

It will be appreciated that a cover plate may also be provided over the display 40 to protect the display 40 from scratches or water damage. The cover plate may be a transparent glass cover plate, so that a user can observe the content displayed on the display screen 40 through the cover plate. It is understood that the cover plate may be a glass cover plate made of sapphire.

The housing 50 is used to form the exterior profile of the electronic device 100 so as to house the electronics, functional components, etc. of the electronic device 100 while providing a seal and protection for the electronics and functional components inside the electronic device. For example, functional components such as a camera, a circuit board, a vibration motor, etc. of the electronic device 100 may be provided inside the housing 50. It will be appreciated that the housing 50 may include a center and a rear cover.

The middle frame may have a thin plate-like or sheet-like structure, or may have a hollow frame structure. The center frame is used to provide support for the electronics or functional components in the electronic device 100 to mount the electronics, functional components of the electronic device 100 together. For example, the middle frame may be provided with a groove, a protrusion, etc. to facilitate mounting of electronic devices or functional components of the electronic apparatus 100. It is understood that the material of the middle frame may include metal or plastic.

The rear cover is connected with the middle frame. For example, the rear cover may be attached to the center frame by an adhesive such as double-sided tape to effect connection with the center frame. The rear cover is used to seal 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 40, 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 forming process of the rear cover, a rear camera mounting hole and other structures can be formed on the rear cover. It will be appreciated that the material of the rear cover may also comprise metal or plastic, etc.

A circuit board 60 is disposed inside the housing 50. For example, the circuit board 60 may be mounted on a center frame of the case 50 to be fixed, and the circuit board 60 is sealed inside the electronic device by a battery cover. Specifically, the circuit board may be mounted on one side of the carrier board, and the display screen is mounted on the other side of the carrier board. The circuit board 60 may be a motherboard of the electronic device 100. Wherein, the circuit board 60 may further integrate one or more of a processor, a camera, an earphone interface, an acceleration sensor, a gyroscope, a motor, and other functional components. Meanwhile, the display screen 40 may be electrically connected to the circuit board 60 to control the display of the display screen 40 by a processor on the circuit board 60.

The battery 70 is disposed inside the housing 50. For example, the battery 70 may be mounted on a center frame of the case 50 to be fixed, and the battery 70 is sealed inside the electronic device by a battery cover. Meanwhile, the battery 70 is electrically connected to the circuit board 60 to enable the battery 70 to supply power to the electronic device 100. Wherein the circuit board 60 may have a power management circuit disposed thereon. The power management circuit is used to distribute the voltage provided by the battery 70 to the various electronic devices in the electronic device 100.

In the embodiment of the present application, a radio frequency circuit is further disposed in the electronic device 100. The radio frequency circuit is disposed inside the housing of the electronic device 100. The radio frequency circuit is used for transmitting radio frequency signals to the outside and receiving radio frequency signals from the outside. For example, the radio frequency circuit may be used to transmit radio frequency signals to a base station or other electronic device and to receive radio frequency signals transmitted by the base station or other electronic device. Thus, communication of the electronic device with the base station and other electronic devices can be achieved. The radio frequency signal may include one of a cellular network signal, a wireless fidelity (Wireless Fidelity, wi-Fi) signal, a positioning signal, and the like.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a radio frequency circuit according to an embodiment of the application.

The radio frequency circuit includes a signal source 10, a tuning circuit 20, and an antenna radiator 30.

When the antenna radiator 30 is in operation, the signal source 10 can simultaneously transmit a plurality of signal sources 10 according to requirements, after being tuned by the tuning circuit 20, signals after being tuned are input into the antenna radiator 30, and the antenna radiator 30 radiates the signals after being tuned to the outside.

The tuning circuit 20 includes a first capacitor 210, a first inductor 220, a second inductor 230, a first tuning module 240, a second tuning module 250, a third tuning module 260, and a fourth tuning module 270.

The first capacitor 210 includes a first input terminal A1 and a first output terminal A2, the first inductor 220 includes a second input terminal B1 and a second output terminal B2, and the second inductor 230 includes a third output terminal C2 and a third output terminal C2.

The first input terminal A1 is connected to the signal source 10, the first output terminal A2 is connected to the second input terminal B1, and the second output terminal B2 is connected to the third input terminal C1. The antenna radiator 30 is connected in parallel between the second output terminal B2 and the third input terminal C1. The third output terminal C2 is connected to the ground point G.

One end of the first tuning module 240 is connected to the first input terminal A1, and the other end of the first tuning module 240 is connected to the first output terminal A2, that is, the first tuning module 240 and the first capacitor 210 are connected in parallel to the signal source 10. When the first tuning module 240 operates, the first tuning module 240 may tune the signal output by the signal source 10, thereby obtaining a tuned first radio frequency signal.

One end of the second tuning module 250 is connected to the second input terminal B1, and the other end of the second tuning module 250 is connected to the second output terminal B2, that is, the second tuning module 250 and the first inductor 220 are connected in parallel to the first output terminal A2. When the second tuning module 250 is operated, the second tuning module 250 may tune the signal output by the signal source 10, thereby obtaining a tuned second radio frequency signal.

One end of the third tuning module 260 is connected between the first output terminal A2 and the second input terminal B1, and the other end of the third tuning module 260 is connected to the ground point G, that is, the third tuning module 260 is connected in parallel between the first output terminal A2 and the second input terminal B1. When the third tuning module 260 operates, the third tuning module 260 may tune the signal output by the signal source 10, thereby obtaining a tuned third radio frequency signal.

One end of the fourth tuning module 270 is connected between the first output terminal A2 and the second input terminal B1, and the other end of the fourth tuning module 270 is connected to the ground point G, that is, the fourth tuning module 270 is connected in parallel between the first output terminal A2 and the second input terminal B1. When the fourth tuning module 270 operates, the fourth tuning module 270 may tune the signal output by the signal source 10, thereby obtaining a tuned fourth radio frequency signal.

Wherein the third tuning module 260 and the fourth tuning module 270 are in parallel relationship, i.e. both are connected in parallel between the first output terminal A2 and the second input terminal B1.

In some embodiments, the first tuning module 240 may be turned on simultaneously with the third tuning module 260, at which time the antenna radiator 30 may be used to radiate the first radio frequency signal and the third radio frequency signal. The first tuning module 240 may be turned on simultaneously with the fourth tuning module 270, and the antenna radiator 30 may radiate the first radio frequency signal and the fourth radio frequency signal.

In some embodiments, the second tuning module 250 may be turned on simultaneously with the third tuning module 260, at which time the antenna radiator 30 may be used to radiate the second radio frequency signal and the third radio frequency signal. The second tuning module 250 may be turned on simultaneously with the fourth tuning module 270, and the antenna radiator 30 may radiate the second radio frequency signal and the fourth radio frequency signal.

In some embodiments, the series circuit of the first capacitor 210, the first inductor 220, and the second inductor 230 may also serve as a tuning module for tuning the radio frequency signal in the first frequency range. Wherein the first frequency range may comprise a first radio frequency signal.

In some embodiments, when none of the first tuning module 240, the second tuning module 250, the third tuning module 260, and the fourth tuning module 270 are operated, only the whole tuning circuit 20 remains, and the series circuit of the first capacitor 210, the first inductor 220, and the second inductor 230 plays a tuning role. The tuning circuit 20 may output a fifth radio frequency signal as well as a radio frequency signal of the first frequency range.

It should be noted that, the frequency of the fifth rf signal is much higher than the frequency of the rf signal in the first frequency range. In practical applications, the current distribution corresponding to the fifth rf signal is often distributed in the parasitic branches of the antenna radiator 30, and the current corresponding to the rf signal in the first frequency range will not be interfered. Thus, the antenna radiator 30 may transmit the fifth radio frequency signal and the radio frequency signal of the first frequency range at the same time.

In the embodiment of the present application, the signal source 10 may output various types of signals, and then tune the corresponding signals through different tuning modules, so as to obtain various types of tuning signals, and radiate the various types of signals to the outside through the antenna radiator 30.

It should be noted that, the first radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal may be radio frequency signals in a first frequency range, and the first frequency range may be a long term evolution LTE signal, specifically may be a Middle Band (MB) and a High Band (HB) of the long term evolution LTE signal, where the MB includes a frequency range of 1710MHz to 2170MHz, and the HB includes a frequency range of 2300MHz to 2690MHz. The first radio frequency signal may specifically be a high frequency radio frequency signal, and the third radio frequency signal and the fourth radio frequency signal may be intermediate frequency radio frequency signals.

In addition, the first radio frequency signal, the second radio frequency signal and the fifth radio frequency signal may be 5G signals, wherein the specific first radio frequency signal may be 5G signals of N41 frequency band (2.5 GHz-2.6 GHz), the second radio frequency signal may be radio frequency signals of N79 frequency band (4.8 GHz-5 GHz), and the fifth radio frequency signal may be radio frequency signals of N78 frequency band (3.3 GHz-3.6 GHz).

Referring to fig. 3, fig. 3 is a circuit schematic diagram of a first tuning module according to an embodiment of the application.

The first tuning module 240 includes a second capacitor 241, a first switch K1, and a second switch K2, where the second capacitor 241 includes a fourth input end D1 and a fourth output end D2, the fourth input end D1 is connected to the first input end A1, the fourth output end D2 is connected to the first switch K1, and the other end of the first switch K1 is connected to the first output end A2. That is, the first switch K1 is connected in series between the first output terminal A2 and the fourth output terminal D2.

A second switch K2 is connected in parallel between the second capacitor 241 and the first switch K1, one end of the second switch K2 is connected to the fourth output terminal D2, and the other end of the second switch K2 is connected to the ground point G.

When the first tuning module 240 needs to work, at this time, the first switch K1 is in a connected state, the second switch K2 is in an disconnected state, the signal source 10 can input the first radio frequency signal into the tuning circuit 20, and the tuning circuit 20 tunes the first radio frequency signal under the action of the first tuning module 240, so that the tuned first signal is transmitted to the antenna radiator 30, and the antenna radiator 30 can radiate the first radio frequency signal.

When the first tuning module 240 is operated, the Antenna radiator 30, the feed source, and the ground point G are combined, and the Antenna radiator 30 corresponds to an Inverted-F Antenna (IFA), and the Antenna radiator 30 can radiate the first radio frequency signal.

When the first tuning module 240 does not need to operate, the first switch K1 is in an off state, so as to realize the disconnection of the first tuning module 240. However, when the first switch K1 is turned off, parasitic capacitance may exist in the first switch K1, which may cause the first tuning module 240 to interfere with the normal operation of the entire tuning circuit 20. At this time, the second switch K2 is connected to the ground point G by putting the second switch K2 in a connected state, thereby eliminating parasitic capacitance existing when the first switch K1 is turned off.

Referring to fig. 4, fig. 4 is a schematic circuit diagram of a second tuning module according to an embodiment of the application.

The second tuning module 250 includes a third switch K3, a fourth switch K4, and a third capacitor 251. The third capacitor 251 includes a fifth input terminal E1 and a fifth output terminal E2, and a third switch K3 is connected in series between the second input terminal B1 and the fifth input terminal E1, where the fifth output terminal E2 and the second output terminal B2 are connected.

One end of the fourth switch K4 is connected in parallel between the third switch K3 and the third capacitor 251, and the other end of the fourth switch K4 is connected with the ground point G.

When the second tuning module 250 needs to work, the third switch K3 is in a connected state, the fourth switch K4 is in a disconnected state, and at this time, the third capacitor 251 is equivalent to being connected in parallel with the first inductor 220 on the first output end A2, the signal source 10 can input the second radio frequency signal into the tuning circuit 20, and the tuning circuit 20 can tune the second radio frequency signal under the action of the second tuning module 250, so that the tuned second signal is transmitted to the antenna radiator 30, and the antenna radiator 30 can radiate the second radio frequency signal.

In some embodiments, when the third switch K3 is connected, the first inductor 220 and the third capacitor 251 are in a parallel state, and the first inductor 220 and the third capacitor 251 may be considered as an integral series connection between the first output end A2 and the third input end C1, and when the antenna radiator 30 needs to radiate a radio frequency signal in the first frequency range, the first frequency range is an intermediate frequency radio frequency signal and a high frequency radio frequency signal of the long term evolution LTE signal because the first frequency range is relatively low with respect to the second radio frequency signal, such as the second radio frequency signal is an N79 frequency band.

At this time, the first inductor 220 and the third capacitor 251 are regarded as an inductor with a value smaller than that of the first inductor 220, so that the tuning circuit 20 does not have a great influence on tuning the radio frequency signal in the first frequency range, and the second tuning module 250 can tune the second radio frequency signal, so that the antenna radiator 30 can radiate the second radio frequency signal and the radio frequency signal in the first frequency range at the same time. In practical applications, that is, when the second tuning module 250 works normally, the whole tuning circuit 20 can tune the intermediate frequency radio frequency signal and the high frequency radio frequency signal of the long term evolution LTE signal and the radio frequency signal of the N79 frequency band of the 5G signal.

When the second tuning module 250 does not need to work, the third switch K3 is in an off state, so that the second tuning module 250 is turned off. However, when the third switch K3 is turned off, parasitic capacitance may exist in the third switch K3, which may cause the second tuning module 250 to interfere with the normal operation of the entire tuning circuit 20. At this time, the fourth switch K4 may be in a connected state, and the fourth switch K4 may be connected to the ground point G, so as to eliminate parasitic capacitance existing when the third switch K3 is turned off.

Referring to fig. 5, fig. 5 is a circuit schematic diagram of a third tuning module according to an embodiment of the application.

The third tuning module 260 includes a third inductor 261, a fifth switch K5, and a sixth switch K6. The third inductor 261 includes a sixth input terminal F1 and a sixth output terminal F2, the sixth output terminal F2 is connected to the ground point G, and the fifth switch K5 is connected in series between the first output terminal A2 and the sixth input terminal F1. One end of the sixth switch K6 is connected in parallel between the fifth switch K5 and the third inductor 261, and the other end of the sixth switch K6 is connected to the ground point G.

When the third tuning module 260 works, the fifth switch K5 is in a connected state, the sixth switch K6 is in an disconnected state, the third inductor 261 is equivalent to being connected in parallel between the first output end A2 and the second input end B1, the signal source 10 can input a third radio frequency signal into the tuning circuit 20, and the tuning circuit 20 tunes the third radio frequency signal under the action of the third tuning module 260, so that the tuned third signal is transmitted to the antenna radiator 30, and the antenna radiator 30 can radiate the third radio frequency signal.

It should be noted that, when the third tuning module 260 operates, the tuned third radio frequency signal may be a signal in a B3 band (1710 MHz-1785 MHz) of the long term evolution LTE signal.

When the third tuning module 260 does not need to work, the fifth switch K5 is in an off state, so that the third tuning module 260 is turned off. However, when the fifth switch K5 is turned off, parasitic capacitance may exist in the fifth switch K5, which may cause the third tuning module 260 to interfere with the normal operation of the entire tuning circuit 20. At this time, the sixth switch K6 is in the on state, and the sixth switch K6 is connected to the ground point G, so that parasitic capacitance existing when the fifth switch K5 is turned off can be eliminated.

Referring to fig. 6, fig. 6 is a circuit schematic diagram of a fourth tuning module according to an embodiment of the application.

The fourth tuning module 270 includes a fourth inductor 271, a seventh switch K7, and an eighth switch K8. The fourth inductor 271 includes a seventh input terminal H1 and a seventh output terminal H2, the seventh output terminal H2 is connected to the ground point G, and the seventh switch K7 is connected in series between the first output terminal A2 and the seventh input terminal H1. One end of the eighth switch K8 is connected in parallel between the seventh switch K7 and the fourth inductor 271, and the other end of the eighth switch K8 is connected to the ground point G.

When the fourth tuning module 270 works, the seventh switch K7 is in a connected state, the eighth switch K8 is in an off state, the fourth inductor 271 is connected in parallel between the first output end A2 and the second input end B1, the signal source 10 can input a fourth radio frequency signal into the tuning circuit 20, and the tuning circuit 20 tunes the fourth radio frequency signal under the action of the fourth tuning module 270, so that the tuned fourth signal is transmitted to the antenna radiator 30, and the antenna radiator 30 can radiate the fourth radio frequency signal.

It should be noted that, when the fourth tuning module 270 operates, the tuned fourth radio frequency signal may be a signal in a B1 band (1920 MHz-1980 MHz) of the long term evolution LTE signal.

When the fourth tuning module 270 does not need to operate, the seventh switch K7 is turned off, so as to switch off the fourth tuning module 270. However, when the seventh switch K7 is turned off, parasitic capacitance may exist in the seventh switch K7, which may cause the fourth tuning module 270 to interfere with the normal operation of the entire tuning circuit 20. At this time, the eighth switch K8 may be placed in a connected state, and the eighth switch K8 may be connected to the ground point G, so that parasitic capacitance existing when the seventh switch K7 is turned off may be eliminated.

With continued reference to fig. 7, fig. 7 is a graph of reflection coefficient of an antenna according to an embodiment of the application.

In the embodiment of the present application, when the antenna radiator 30 is used for radiating the radio frequency signals of the middle-high frequency band of the LTE signal, and the antenna radiator 30 is used for radiating the radio frequency signals of the N41, N78, N79 frequency bands of the 5G signal. The S11 parameters of the antenna are below-6 dB, and the antenna radiator 30 is used for good radiation performance.

In practical application, the tuning circuit 20 provided in the embodiment of the application not only can tune various types of radio frequency signals, but also can ensure that the signals input to the antenna radiator 30 do not contain clutter, so that the antenna radiator 30 can have higher radiation performance when radiating radio frequency signals in a plurality of frequency bands.

In the embodiment of the present application, by setting a plurality of tuning modules in the tuning circuit 20, by the operation of the plurality of tuning modules, at least one type of radio frequency signal can be radiated on one antenna radiator 30, thereby reducing the number of antenna radiators 30, and increasing the isolation of the antenna radiators 30 between the interiors of electronic devices, so as to improve the radiation performance of the antenna radiators 30, and finally improve the communication quality of the electronic devices.

The tuning circuit, the radio frequency circuit and the electronic device provided by the embodiment of the application are described in detail, and specific examples are applied to the description of the principle and the implementation of the application, and the description of the above embodiments is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, the present description should not be construed as limiting the present application.

Claims (12)

1. A tuning circuit, comprising:

the first capacitor comprises a first input end and a first output end, and the first input end of the first capacitor is connected with the signal source;

the first inductor comprises a second input end and a second output end, the second input end is connected with the first output end, and the second output end is connected with the antenna radiator;

the first tuning module is connected with the first input end and the first output end;

the second tuning module is connected with the second input end and the second output end;

the third tuning module and the fourth tuning module are connected in parallel between the first output end and the second input end;

the first tuning module, the second tuning module, the third tuning module and the fourth tuning module are used for outputting radio frequency signals in different frequency ranges to the antenna radiator.

2. The tuning circuit of claim 1, wherein the tuning circuit further comprises:

the second inductor comprises a third input end and a third output end, the antenna radiator is connected between the second output end and the third input end in parallel, and the third output end is connected with a grounding point.

3. The tuning circuit of claim 1, wherein the first tuning module comprises:

the second capacitor comprises a fourth input end and a fourth output end, and the fourth input end is connected with the first input end;

and the first switch is connected in series between the fourth output end and the first output end, and when the first switch is communicated, the tuning circuit is used for outputting a first radio frequency signal to the antenna radiator.

4. The tuning circuit of claim 3, wherein the first tuning module further comprises:

and one end of the second switch is connected in parallel between the second capacitor and the first switch, and the other end of the second switch is connected with a grounding point.

5. The tuning circuit of claim 1, wherein the second tuning module comprises:

the third capacitor comprises a fifth input end and a fifth output end, and the fifth output end is connected with the second output end;

and the third switch is connected in series between the second input end and the fifth input end, and when the third switch is communicated, the tuning circuit is used for outputting a second radio frequency signal to the antenna radiator.

6. The tuning circuit of claim 5, wherein the second tuning module further comprises:

and the fourth switch Guan Yiduan is connected between the third switch and the third capacitor in parallel, and the other end of the fourth switch is connected with a grounding point.

7. The tuning circuit of claim 1, wherein the third tuning module comprises:

the third inductor comprises a sixth input end and a sixth output end, and the sixth output end is connected with a grounding point;

and the fifth switch is connected in series between the first output end and the sixth input end, and when the fifth switch is communicated, the tuning circuit is used for outputting a third radio frequency signal to the antenna radiator.

8. The tuning circuit of claim 7, wherein the third tuning module further comprises:

and a sixth switch Guan Yiduan connected in parallel between the fifth switch and the third inductor, wherein the other end of the sixth switch is connected with a ground point.

9. The tuning circuit of claim 1, wherein the fourth tuning module comprises:

the fourth inductor comprises a seventh input end and a seventh output end, and the seventh output end is connected with a grounding point;

a seventh switch, the seventh switch Guan Chuanlian being between the first output and the seventh input, the tuning circuit being configured to output a fourth radio frequency signal to the antenna radiator when the seventh switch is in communication.

10. The tuning circuit of claim 9, wherein the fourth tuning module further comprises:

and an eighth switch Guan Yiduan connected in parallel between the seventh switch and the fourth inductor, and the other end of the eighth switch is connected to a ground point.

11. A radio frequency circuit, comprising a signal source, a tuning circuit and an antenna radiator, wherein the signal source is used for generating a radio frequency signal;

the tuning circuit is used for tuning the radio frequency signal, and is a tuning circuit according to any one of claims 1 to 10;

the antenna radiator is used for transmitting the tuned radio frequency signals to the outside.

12. An electronic device comprising a housing and a radio frequency circuit disposed within the housing, the radio frequency circuit being the radio frequency circuit of claim 11.