CN111211421A - Antenna tuning circuit and mobile terminal - Google Patents

Abstract

The application provides an antenna tuning circuit and a mobile terminal. This application is connected to other radio frequency networks in order to connect through the port with resonance device to matching circuit, not only realizes that antenna carrier and a plurality of radio frequency networks are connected, realizes moreover that tuning device plays tuning antenna's effect and connects other radio frequency networks's effect to let antenna carrier as connecting other radio frequency networks when it does not use tuning device to adjust the resonance, in order to realize the effect of antenna sharing.

Description

Antenna tuning circuit and mobile terminal

Technical Field

The application belongs to the field of terminals, and particularly relates to an antenna tuning circuit and a mobile terminal.

Background

At present, mobile phones are thinner and thinner, the duty ratio of a screen is larger and larger, and the antenna environment is poorer and poorer. At present, electronic products such as mobile phones and watches face a problem, antenna spaces of the products are smaller and smaller, and the antenna spaces are worse and worse, and the mobile phones are often required to be provided with a plurality of antennas in order to realize technologies such as Global Positioning System (GPS), Wireless local area network (WIFI), Long Term Evolution carrier aggregation (LTE CA), and Long Term Evolution multiple Input multiple output (LTE MIMO) on the present electronic products. For example, if an antenna is used for each electronic product such as a mobile phone and a watch, a plurality of antenna clearance areas are needed, and in order to achieve better transmitting and receiving performance of the antenna and better resonance of the antenna, an antenna tuning device is often needed to be added at an antenna end, and the antenna tuning device only plays a role of tuning a resonance point of the antenna.

Disclosure of Invention

The embodiment of the application provides an antenna tuning circuit and a mobile terminal, which realize antenna multiplexing and improve the good transmitting and receiving performance of an antenna through a tuning device so as to solve the problem of poor environment of the antenna.

The application provides an antenna tuning circuit, is applied to mobile terminal, and it includes: a first radio frequency network; the first matching circuit is connected with the first radio frequency network; an antenna carrier connected to the first matching circuit; a tuning device connected to the antenna carrier; a second matching circuit connected to the tuning device; and a second radio frequency network connected to the second matching circuit; wherein the tuning device is configured to adjust a frequency band resonance of the first radio frequency network or to connect the second radio frequency network to the antenna carrier.

Further, the first matching circuit includes: a first node; one end of the first resistor is connected to the first radio frequency network, and the other end of the first resistor is connected to the first node; one end of the second resistor is connected to the first node, and the other end of the second resistor is connected to a ground terminal; and one end of the third resistor is connected to the first node, and the other end of the third resistor is connected to the antenna carrier.

Further, the antenna carrier includes a plurality of antenna clips, wherein a first clip of the plurality of antenna clips is connected to the first matching circuit through a second node, and a second clip of the plurality of antenna clips is connected to the tuning device through a third node.

Further, the second node is connected to a ground terminal through a fourth resistor.

Further, the third node is connected to a ground terminal through a fifth resistor.

Furthermore, the antenna spring plate also comprises a plurality of grounding spring plates, each grounding spring plate is connected to the grounding end through a resistor, and the grounding spring plates are used for improving the frequency point resonance and the resonance wavelength.

Further, the tuning apparatus includes a tuning switch, the tuning switch includes an antenna port, at least a first port, and a plurality of second ports, where the antenna port is connected to the antenna carrier, the first port is connected to the second radio frequency network for implementing antenna multiplexing, and the second port is connected to a ground terminal through a resistor for adjusting frequency band resonance of the first radio frequency network.

Further, the tuning switch includes one of a single-pole double-throw switch, a single-pole triple-throw switch, and a single-pole multiple-throw switch.

Further, the second matching circuit includes: a fourth node; one end of the sixth resistor is connected to the second radio frequency network, and the other end of the sixth resistor is connected to the fourth node; one end of the seventh resistor is connected to the fourth node, and the other end of the seventh resistor is connected to a ground terminal; and an eighth resistor, one end of which is connected to the fourth node and the other end of which is connected to the tuning device.

According to another aspect of the present application, there is provided a mobile terminal including the antenna tuning circuit described above.

The embodiment of the application provides an antenna tuning circuit and a mobile terminal, and the port of a resonance device is connected to a matching circuit to connect other radio frequency networks, so that the antenna carrier is connected with a plurality of radio frequency networks, the tuning device plays a role in tuning an antenna and connecting other radio frequency networks, and the antenna carrier is connected with other radio frequency networks when the tuning device is not used for adjusting resonance, and the antenna sharing function is realized.

Drawings

The technical solutions and advantages of the present application will become apparent from the following detailed description of specific embodiments of the present application when taken in conjunction with the accompanying drawings.

Fig. 1 is a schematic structural diagram of an antenna tuning circuit according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a mobile terminal according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a mobile terminal 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 terms "first," "second," "third," and the like in the description and in the claims of the present application and in the above-described drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so described are interchangeable under appropriate circumstances. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In particular embodiments, the drawings discussed below and the various embodiments used to describe the principles of the present disclosure are by way of illustration only and should not be construed to limit the scope of the present disclosure. Those skilled in the art will understand that the principles of the present application may be implemented in any suitably arranged system. Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. Further, a terminal according to an exemplary embodiment will be described in detail with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements.

The terminology used in the detailed description is for the purpose of describing particular embodiments only and is not intended to be limiting of the concepts of the present application. Unless the context clearly dictates otherwise, expressions used in the singular form encompass expressions in the plural form. In the present specification, it will be understood that terms such as "including," "having," and "containing" are intended to specify the presence of the features, integers, steps, acts, or combinations thereof disclosed in the specification, and are not intended to preclude the presence or addition of one or more other features, integers, steps, acts, or combinations thereof. Like reference symbols in the various drawings indicate like elements.

As shown in fig. 1, the present application provides anantenna tuning circuit 100 applied to a mobile terminal, including: the antenna comprises a firstradio frequency network 110, afirst matching circuit 120, afirst node 121, afirst resistor 122, asecond resistor 123, athird resistor 124, anantenna carrier 130, anantenna spring 131, afirst spring 132, asecond node 133, asecond spring 134, athird node 135, a fourth resistor 136, a fifth resistor 137, agrounding spring 138, atuning device 140, anantenna port 141, afirst port 142, asecond port 143, asecond matching circuit 150, afourth node 151, asixth resistor 152, aseventh resistor 153, aneighth resistor 154, and a secondradio frequency network 160.

Thefirst rf network 110 is a primary rf network.

Thefirst matching circuit 120 has one end connected to the firstradio frequency network 110 and the other end connected to theantenna carrier 130, and thefirst matching circuit 120 is used for impedance matching, specifically, impedance between thefirst matching circuit 120 and the firstradio frequency network 110 to suppress return loss. Thefirst matching circuit 120 forms a better impedance match between theantenna carrier 130 and thefirst rf network 110, so that it has a smaller reflection coefficient, thereby efficiently transmitting the received signal to thefirst rf network 110 and efficiently transmitting the transmitted signal to theantenna carrier 130 and transmitting it. Impedance matching can be described in terms of return loss or standing wave ratio magnitude.

In the embodiment of the present application, thefirst matching circuit 120 includes: afirst node 121; afirst resistor 122, one end of thefirst resistor 122 is connected to thefirst rf network 110, and the other end of thefirst resistor 122 is connected to thefirst node 121; asecond resistor 123, one end of thesecond resistor 123 being connected to thefirst node 121, and the other end of thesecond resistor 123 being connected to a ground terminal; and athird resistor 124, one end of thethird resistor 124 is connected to thefirst node 121, and the other end of thethird resistor 124 is connected to theantenna carrier 130. The resistors can also be matched by using capacitors and inductors.

Theantenna carrier 130 includes a plurality ofantenna clips 131. Afirst clip 132 of the plurality ofantenna clips 131 is connected to thefirst matching circuit 120 through asecond node 133, and asecond clip 134 of the plurality ofantenna clips 131 is connected to thetuning device 140 through athird node 135. Specifically, thesecond node 133 is connected to a ground terminal through a fourth resistor 136, thethird node 135 is connected to the ground terminal through a fifth resistor 137, theantenna spring plate 131 further includes a plurality ofground spring plates 138, eachground spring plate 138 is connected to the ground terminal through a resistor, and theground spring plates 138 are used for improving the frequency resonance and the resonance wavelength.

Thetuning device 140 includes a tuning switch, which includes anantenna port 141, at least afirst port 142, and a plurality ofsecond ports 143, wherein theantenna port 141 is connected to theantenna carrier 130, thefirst port 142 is connected to thesecond rf network 160 for implementing antenna multiplexing, and thesecond port 143 is connected to a ground terminal through a resistor for adjusting the band resonance of thefirst rf network 110, and the resistor can also be matched using a capacitance inductor. Wherein the tuning switch comprises one of a single-pole double-throw switch, a single-pole triple-throw switch and a single-pole multiple-throw switch.

In this embodiment, when only thefirst rf network 110 operates, after theantenna carrier 130 receives the wireless signal, the received signal is directly sent to thefirst matching circuit 120, and then sent to thefirst rf network 110, and the tuning switch is used to adjust the frequency band resonance. When only thesecond rf network 160 operates, after the wireless signal received by theantenna carrier 130, the received signal is sequentially transmitted to thetuning device 140, thesecond matching circuit 150, and then to thesecond rf network 160. When thefirst rf network 110 and thesecond rf network 160 operate simultaneously, after theantenna carrier 130 receives the wireless signal, the receiving signal of the non-operating frequency band is isolated, so that the receiving signal of the corresponding operating frequency band is sent to the correspondingfirst matching circuit 120 and then sent to the correspondingfirst rf network 110, or the receiving signal of the corresponding operating frequency band sequentially sends the receiving signal to thetuning device 140, thesecond matching circuit 150 and then sent to thesecond rf network 160.

In the wireless signals received by thespecific antenna carrier 130, only a signal in one frequency band (for example, a GPS signal) is sent to the corresponding matching circuit or directly sent to the corresponding radio frequency transceiver circuit (for example, a GPS receiving chip). If there are two frequency band signals (for example, GPS signals and 2.4G signals) in the wireless signals received by theantenna carrier 130, the signals are respectively sent to the corresponding matching circuits (for example, thefirst matching circuit 120 or the second matching circuit 150) and then sent to the corresponding radio frequency networks (for example, the firstradio frequency network 110 or the secondradio frequency network 160, where the firstradio frequency network 110 may be a GPS receiving chip and the secondradio frequency network 160 may be an WIFI2.4G transceiver chip). Therefore, by using the tuning device, several antennas can be replaced by one antenna, so that the multiplexing of the antennas is realized, and the resources are greatly saved.

One end of thesecond matching circuit 150 is connected to thesecond rf network 160, and the other end is connected to thetuning device 140, and thesecond matching circuit 150 is used for impedance matching. In particular, the impedance between thesecond matching circuit 150 and the secondradio frequency network 160 suppresses return loss. Thesecond matching circuit 150 provides a better impedance match between theantenna carrier 130 and thesecond rf network 160, so that it has a smaller reflection coefficient, thereby efficiently transmitting the received signal to thesecond rf network 160 and efficiently transmitting the transmitted signal to theantenna carrier 130 and transmitting it. Impedance matching can be described in terms of return loss or standing wave ratio magnitude.

In the embodiment of the present application, thesecond matching circuit 150 includes: afourth node 151; asixth resistor 152, one end of thefirst resistor 152 is connected to thesecond rf network 160, and the other end of thesixth resistor 152 is connected to thefourth node 151; aseventh resistor 153, wherein one end of theseventh resistor 153 is connected to thefourth node 151, and the other end of theseventh resistor 153 is connected to a ground terminal; and aneighth resistor 154, one end of theeighth resistor 154 being connected to thefourth node 151, and the other end of theeighth resistor 154 being connected to thetuning device 140. The resistors can also be matched by using capacitors and inductors.

In other embodiments, thesecond matching circuit 150 may be in other forms, depending on thesecond rf network 160.

Thesecond rf network 160 may be a plurality of different rf networks, which is illustrated in the embodiment without limiting the number thereof.

As shown in fig. 2, the present application provides a mobile terminal 200 including theantenna tuning circuit 100 as described above. The mobile terminal 200 may be: smart phones, tablet computers and the like.

As shown in fig. 3, for a specific structure of the mobile terminal 300 provided in the embodiment of the present application, the mobile terminal 300 may be a smart phone, a tablet computer, or the like. The mobile terminal further comprises the following components.

TheRF circuit 310 is used for receiving and transmitting electromagnetic waves, and performing interconversion between the electromagnetic waves and electrical signals, thereby communicating with a communication network or other devices.RF circuitry 310 may include various existing circuit elements for performing these functions, such as an antenna, a radio frequency transceiver, a digital signal processor, an encryption/decryption chip, a Subscriber Identity Module (SIM) card, memory, and so forth.RF circuit 310 may communicate with various networks such as the internet, an intranet, a wireless network, or with other devices over a wireless network. The wireless network may comprise a cellular telephone network, a wireless local area network, or a metropolitan area network. The Wireless network may use various Communication standards, protocols and technologies, including but not limited to Global System for Mobile Communication (GSM), Enhanced Mobile Communication (EDGE), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Wireless Fidelity (Wi-Fi) (e.g., IEEE802.11a, IEEE802.11 b, IEEE802.11g and/or IEEE802.11 n), Voice over Internet Protocol (VoIP), world wide Microwave Access (Microwave for Wireless), Max-1, and other short message protocols, as well as any other suitable communication protocols, and may even include those that have not yet been developed.

Thememory 320 may be used to store software programs and modules, and theprocessor 380 executes various functional applications and data processing by operating the software programs and modules stored in thememory 320. Thememory 320 may include high speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, thememory 320 may further include memory located remotely from theprocessor 380, which may be connected to the mobile terminal 300 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Theinput unit 330 may be used to receive input numeric or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control. In particular, theinput unit 330 may include a touch-sensitive surface 331 as well asother input devices 332. The touch-sensitive surface 331, also referred to as a touch screen or touch pad, may collect touch operations by a user on or near the touch-sensitive surface 331 (e.g., operations by a user on or near the touch-sensitive surface 331 using a finger, a stylus, or any other suitable object or attachment), and drive the corresponding connection device according to a predetermined program. Alternatively, the touchsensitive surface 331 may comprise two parts, a touch detection means and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to theprocessor 380, and can receive and execute commands sent by theprocessor 380. In addition, the touch-sensitive surface 331 may be implemented using various types of resistive, capacitive, infrared, and surface acoustic waves. Theinput unit 330 may compriseother input devices 332 in addition to the touchsensitive surface 331. In particular,other input devices 332 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like.

Thedisplay unit 340 may be used to display information input by or provided to the user and various graphical user interfaces of the mobile terminal 300, which may be made up of graphics, text, icons, video, and any combination thereof. TheDisplay unit 340 may include aDisplay panel 341, and optionally, theDisplay panel 341 may be configured in the form of an LCD (Liquid Crystal Display), an OLED (Organic Light-Emitting Diode), or the like. Further, touch-sensitive surface 331 mayoverlay display panel 341, and when touch-sensitive surface 331 detects a touch operation thereon or thereabout, communicate toprocessor 380 to determine the type of touch event, andprocessor 380 then provides a corresponding visual output ondisplay panel 341 in accordance with the type of touch event. Although in FIG. 3, touch-sensitive surface 331 anddisplay panel 341 are implemented as two separate components for input and output functions, in some embodiments, touch-sensitive surface 331 anddisplay panel 341 may be integrated for input and output functions.

The mobile terminal 300 may also include at least onesensor 350, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor that may adjust the brightness of thedisplay panel 341 according to the brightness of ambient light, and a proximity sensor that may turn off thedisplay panel 341 and/or the backlight when the mobile terminal 300 is moved to the ear. As one of the motion sensors, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when the mobile phone is stationary, and can be used for applications of recognizing the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer and tapping), and the like; as for other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which may be further configured on the mobile terminal 300, detailed descriptions thereof are omitted.

Audio circuitry 360,speaker 361, andmicrophone 362 may provide an audio interface between a user and the mobile terminal 300. Theaudio circuit 360 may transmit the electrical signal converted from the received audio data to thespeaker 361, and the audio signal is converted by thespeaker 361 and output; on the other hand, themicrophone 362 converts the collected sound signal into an electrical signal, which is received by theaudio circuit 360 and converted into audio data, which is then processed by the audiodata output processor 380 and transmitted to, for example, another terminal via theantenna device 310, or the audio data is output to thememory 320 for further processing. Theaudio circuit 360 may also include an earbud jack to provide communication of a peripheral headset with the mobile terminal 300.

Theprocessor 380 is a control center of the mobile terminal 300, connects various parts of the entire mobile phone using various interfaces and lines, and performs various functions of the mobile terminal 300 and processes data by operating or executing software programs and/or modules stored in thememory 320 and calling data stored in thememory 320, thereby integrally monitoring the mobile phone. Optionally,processor 380 may include one or more processing cores; in some embodiments,processor 380 may integrate an application processor, which primarily handles operating systems, user interfaces, applications, etc., and a modem processor, which primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated intoprocessor 380.

The mobile terminal 300 also includes a power supply 390 (e.g., a battery) that provides power to the various components and, in some embodiments, may be logically coupled to theprocessor 380 via a power management system to manage charging, discharging, and power consumption management functions via the power management system. Thepower supply 390 may also include any component including one or more of a dc or ac power source, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and the like.

Although not shown, the mobile terminal 300 may further include a camera (e.g., a front camera, a rear camera), a bluetooth module, etc., which will not be described herein.

In specific implementation, the above modules may be implemented as independent entities, or may be combined arbitrarily to be implemented as the same or several entities, and specific implementation of the above modules may refer to the foregoing method embodiments, which are not described herein again.

This application is connected to other radio frequency networks in order to connect through the port with resonance device to matching circuit, not only realizes that antenna carrier and a plurality of radio frequency networks are connected, realizes moreover that tuning device plays tuning antenna's effect and connects other radio frequency networks's effect to let antenna carrier as connecting other radio frequency networks when it does not use tuning device to adjust the resonance, in order to realize the effect of antenna sharing.

The antenna tuning circuit and the mobile terminal provided in the embodiments of the present application are described in detail above, and a specific example is applied in the description to explain the principle and the embodiments of the present application, and the description of the embodiments above is only used to help understand the method and the core idea of 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 (10)

1. An antenna tuning circuit applied to a mobile terminal, comprising:

a first radio frequency network;

the first matching circuit is connected with the first radio frequency network;

an antenna carrier connected to the first matching circuit;

a tuning device connected to the antenna carrier;

a second matching circuit connected to the tuning device; and

the second radio frequency network is connected with the second matching circuit;

wherein the tuning device is configured to adjust a frequency band resonance of the first radio frequency network or to connect the second radio frequency network to the antenna carrier.

2. The antenna tuning circuit of claim 1, wherein the first matching circuit comprises:

a first node;

one end of the first resistor is connected to the first radio frequency network, and the other end of the first resistor is connected to the first node;

one end of the second resistor is connected to the first node, and the other end of the second resistor is connected to a ground terminal; and

and one end of the third resistor is connected to the first node, and the other end of the third resistor is connected to the antenna carrier.

3. The antenna tuning circuit of claim 1, wherein the antenna carrier comprises a plurality of antenna clips, wherein a first of the plurality of antenna clips is connected to the first matching circuit via a second node, and wherein a second of the plurality of antenna clips is connected to the tuning device via a third node.

4. The antenna tuning circuit of claim 3, wherein the second node is connected to ground via a fourth resistor.

5. The antenna tuning circuit of claim 3, wherein the third node is connected to ground via a fifth resistor.

6. The antenna tuning circuit of claim 2, wherein the antenna spring further comprises a plurality of grounding springs, each grounding spring is connected to a ground terminal through a resistor, and the grounding springs are used for improving frequency resonance and resonance wavelength.

7. The antenna tuning circuit of claim 1, wherein the tuning device comprises a tuning switch, the tuning switch comprises an antenna port, at least a first port, and a plurality of second ports, wherein the antenna port is connected to the antenna carrier, the first port is connected to the second rf network for antenna multiplexing, and the second port is connected to ground via a resistor for adjusting the band resonance of the first rf network.

8. The antenna tuning circuit of claim 7, wherein the tuning switch comprises one of a single-pole double-throw switch, a single-pole triple-throw switch, and a single-pole multiple-throw switch.

9. The antenna tuning circuit of claim 1, wherein the second matching circuit comprises:

a fourth node;

one end of the sixth resistor is connected to the second radio frequency network, and the other end of the sixth resistor is connected to the fourth node;

one end of the seventh resistor is connected to the fourth node, and the other end of the seventh resistor is connected to a ground terminal; and

an eighth resistor, one end of which is connected to the fourth node, and the other end of which is connected to the tuning device.

10. A mobile terminal, characterized in that it comprises an antenna tuning circuit according to any of claims 1-9.

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