CN110971262A

CN110971262A - Radio frequency circuit, antenna device and mobile terminal

Info

Publication number: CN110971262A
Application number: CN201911199577.9A
Authority: CN
Inventors: 贾宇; 温鼎宁; 张华�; 陶龙西
Original assignee: Huizhou TCL Mobile Communication Co Ltd
Current assignee: Jiangsu He Microelectronics Technology Co ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-04-07
Anticipated expiration: 2039-11-29
Also published as: CN110971262B

Abstract

The embodiment of the application provides a radio frequency circuit, an antenna device and a mobile terminal. The radio frequency circuit comprises a radio frequency chip, a power amplifier, a filtering unit, a radio frequency front end component and an antenna which are connected in sequence; the radio frequency chip comprises a transmitting end and a receiving end, the transmitting end is connected with the power amplifier, the receiving end is connected with the filtering unit, and the filtering unit comprises a first duplexer; a single-pole double-throw switch and a high-pass filter are further connected between the first duplexer and the radio frequency front-end component, the fixed end of the single-pole double-throw switch is connected with the first duplexer, the first gating end of the single-pole double-throw switch is connected with the radio frequency front-end component, the second gating end of the single-pole double-throw switch is connected with the first end of the high-pass filter, and the second end of the high-pass filter is connected with the radio frequency front-end component.

Description

Radio frequency circuit, antenna device and mobile terminal

Technical Field

The present application relates to the field of communications technologies, and in particular, to a radio frequency circuit, an antenna apparatus, and a mobile terminal.

Background

With the development of communication technology, more and more communication frequency bands can be supported by the mobile terminal. For example, an LTE (long term Evolution) communication signal may include a signal having a frequency between 700MHz and 2700 MHz.

Radio frequency signals that can be supported by a mobile terminal can be divided into low frequency signals, intermediate frequency signals, and high frequency signals. The low-frequency signal, the intermediate-frequency signal and the high-frequency signal respectively comprise a plurality of sub-frequency band signals. Each sub-band signal needs to be transmitted to the outside world via an antenna. The ability of the rf circuit to transmit and receive rf signals is an important factor for measuring the communication capability of the mobile terminal, and how to reduce the manufacturing cost while maintaining the communication capability of the rf circuit has become a major concern in the industry.

Disclosure of Invention

The embodiment of the application provides a radio frequency circuit, an antenna device and a mobile terminal, which can effectively reduce the path insertion loss and the manufacturing cost of the radio frequency circuit.

The embodiment of the application provides a radio frequency circuit, which comprises a radio frequency chip, a power amplifier, a filtering unit, a radio frequency front end component and an antenna, wherein the radio frequency chip, the power amplifier, the filtering unit, the radio frequency front end component and the antenna are sequentially connected;

the radio frequency chip comprises a transmitting end and a receiving end, the transmitting end is connected with the power amplifier, the receiving end is connected with the filtering unit, and the filtering unit comprises a first duplexer;

a single-pole double-throw switch and a high-pass filter are further connected between the first duplexer and the radio frequency front end component, the fixed end of the single-pole double-throw switch is connected with the first duplexer, the first gating end of the single-pole double-throw switch is connected with the radio frequency front end component, the second gating end of the single-pole double-throw switch is connected with the first end of the high-pass filter, and the second end of the high-pass filter is connected with the radio frequency front end component.

In the radio frequency circuit according to the embodiment of the present application, the first duplexer is configured to process a signal in a B28 frequency band, and the uplink frequency in the B28 frequency band is 703-748 MHz.

In the radio frequency circuit according to the embodiment of the present application, when the radio frequency circuit registers to an intermediate channel in the B28 frequency band, the fixed end of the single-pole double-throw switch is controlled to communicate with the second gate end, and the intermediate channel in the B28 frequency band is suppressed by the high-pass filter.

In the radio frequency circuit according to the embodiment of the present application, an insertion loss value of the high-pass filter to the intermediate channel is greater than a first insertion loss threshold.

In the radio frequency circuit according to the embodiment of the present application, the intermediate channel is 710 MHz.

In the radio frequency circuit according to the embodiment of the present application, when the radio frequency circuit registers to a channel other than the intermediate channel in the B28 frequency band, the fixed end of the single-pole double-throw switch is controlled to communicate with the first gating end.

In the radio frequency circuit according to the embodiment of the present application, the power amplifier includes a first output terminal, a second output terminal, a third output terminal, a fourth output terminal, and a fifth output terminal, and the filtering unit further includes a second duplexer, a third duplexer, a fourth duplexer, and a fifth duplexer;

wherein, the first output end with first duplexer connects, the second output end with the second duplexer connects, the third output end with the third duplexer connects, the fourth output end with the fourth duplexer connects, the fifth output end with the fifth duplexer connects.

In the radio frequency circuit according to the embodiment of the present application, the second duplexer, the third duplexer, the fourth duplexer, and the fifth duplexer are all configured to process low-frequency band signals.

In the radio frequency circuit according to the embodiment of the present application, the low frequency band signal includes a B5 band, a B8 band, a B12 band, and a B13 band.

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

Correspondingly, the embodiment of the application also provides a mobile terminal, which comprises a shell and a circuit board, wherein the circuit board is installed inside the shell, and a radio frequency circuit is arranged on the circuit board and is the radio frequency circuit.

The radio frequency circuit provided by the embodiment of the application comprises a radio frequency chip, a power amplifier, a filtering unit, a radio frequency front end component and an antenna which are connected in sequence; the radio frequency chip comprises a transmitting end and a receiving end, the transmitting end is connected with the power amplifier, the receiving end is connected with the filtering unit, and the filtering unit comprises a first duplexer; first duplexer with still be connected with a single-pole double-throw switch and a high pass filter between the radio frequency front end subassembly, the stiff end of single-pole double-throw switch with first duplexer is connected, the first gating end of single-pole double-throw switch with the radio frequency front end subassembly is connected, the second gating end of single-pole double-throw switch with the first end of high pass filter is connected, the second end of high pass filter with the radio frequency front end subassembly is connected, can effectively reduce the route of radio frequency circuit and insert and decrease and manufacturing cost.

Drawings

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

Fig. 1 is a schematic diagram of a prior art rf circuit.

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 radio frequency circuit according to an embodiment of the present application.

Fig. 4 is a characteristic graph of a high-pass filter provided in an embodiment of the present application.

Fig. 5 is another 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.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

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.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

The 3GPP has established a requirement for NS _17 that transmissions of 5M and 10M bandwidths are to be measured when the LTE carrier contains 718 and 748MHz, requiring that the stray power in the 6MHz bandwidth is less than-26.2 dBM in 470 and 710 when transmitting.

The uplink frequency of the LTE B28 frequency band signal is 703-748MHz, and for NS-17, when the test B28 frequency band is required to work at the middle frequency of 725.5MHz, the spectrum stray can not be larger than-26.2 dBm within 470-710MHz under the bandwidths of 5MHz and 10 MHz.

When the B28 band signal is full band, the B28 is usually divided into a segment (703-720.5MHz) and a segment (720.5-748MHz), and two duplexers are used to solve the problem.

As shown in fig. 1, in the radio frequency circuit 100 of the prior art, the radio frequency circuit 100 generally has 6 low frequency duplexers, which include a B5 duplexer 101, a B8 duplexer 102, a B28A duplexer 103, a B28B duplexer 104, a B13 duplexer 105, and a B12 duplexer 106, but the PA power amplifier 107 used only has 5 output ports, so that an SP2T single-pole double-throw switch 108 is added to the radio frequency circuit architecture to meet the requirement of processing 6 low frequency signals, and the transmission signal is amplified by the PA power amplifier 107, then passes through the corresponding duplexer, and is transmitted to the antenna terminal through a TXM radio frequency front-end component 109 for transmission.

The embodiment of the application provides a radio frequency circuit with a B28 full band (full band) architecture, which can omit a duplexer, isolate a transmitting signal from a receiving signal, ensure that both receiving and transmitting can work normally at the same time, and achieve the purpose of reducing the manufacturing cost.

The embodiment of the application provides a mobile terminal. The mobile terminal can be a smart phone, a tablet computer and other devices. Referring to fig. 2, the mobile terminal 200 includes a cover plate 210, a display 220, a circuit board 230, a battery 240, and a case 250.

Wherein the cover plate 210 is mounted to the display screen 220 to cover the display screen 220. The cover plate 210 may be a transparent glass cover plate. In some embodiments, the cover plate 210 may be a glass cover plate made of a material such as sapphire.

The display screen 220 is mounted on the housing 250 to form a display surface of the mobile terminal 200.

A display area 220A and a non-display area 220B may be included. The display area 220A is used to display information such as images and text. The non-display area 220B does not display information. The bottom of the non-display area 220B may be provided with functional elements such as a fingerprint module, a touch circuit, and the like.

In some embodiments, the display screen 220 may also be a full screen, with only display areas and no non-display areas. Wherein, functional components such as fingerprint module, touch-control circuit set up the below at the full screen.

The circuit board 230 is mounted inside the housing 250. The circuit board 230 may be a main board of the mobile terminal 200. Functional components such as a camera, a proximity sensor, and a processor may be integrated on the circuit board 230. Meanwhile, the display screen 220 may be electrically connected to the circuit board 230.

In some embodiments, a Radio Frequency (RF) circuit 300 is disposed on the circuit board 230. The radio frequency circuit can communicate with a network device (e.g., a server, a base station, etc.) or other mobile terminals (e.g., a smart phone, etc.) through a wireless network to complete information transceiving with the network device or other mobile terminals.

In some embodiments, as shown in fig. 3, the rf circuit 300 includes an rf chip 10, a power amplifier 20, a filtering unit 30, an rf front-end component 40, and an antenna 50, wherein the rf chip 10, the power amplifier 20, the filtering unit 30, the rf front-end component 40, and the antenna 50 are connected in sequence;

the radio frequency chip 10 includes a transmitting end and a receiving end, the transmitting end is connected to the power amplifier 20, the receiving end is connected to the filtering unit 30, and the filtering unit 30 includes a first duplexer 31;

a single-pole double-throw switch 60 and a high-pass filter 70 are further connected between the first duplexer 31 and the rf front-end module 40, a fixed end 61 of the single-pole double-throw switch 60 is connected to the first duplexer 31, a first gating end 62 of the single-pole double-throw switch 60 is connected to the rf front-end module 40, a second gating end 63 of the single-pole double-throw switch 60 is connected to a first end 71 of the high-pass filter 70, and a second end 72 of the high-pass filter 70 is connected to the rf front-end module 40.

The radio frequency chip 10 may be an RFIC (radio frequency Integrated Circuit), and the RFIC may include components such as a radio frequency transceiver and a control IC. The rf chip 10 can control the transmission and reception of signals, and can also control the connection relationship of switches in the rf circuit path.

The rf front-end component 40 may be a TXM rf front-end functional component, and the TXM rf front-end functional component may include components such as a PA power amplifier (2G) and a Switch antenna Switch.

For example, when the rf circuit 300 transmits an rf signal, a frequency band signal transmitted by the transmitting terminal of the rf chip 10 is processed by the power amplifier 20, then filtered by the duplexer in the filtering unit 30 corresponding to the frequency band, and then transmitted to the antenna 50 through the TXM rf front-end component 40, and finally transmitted to the surrounding environment through the antenna 50.

For example, when the rf circuit 300 receives an rf signal, the antenna 50 receives a surrounding signal, the received signal is communicated to a duplexer of a corresponding frequency band in the filtering unit 30 through the TXM rf front-end component 40 for filtering, and the signal processed by the duplexer returns to a receiving end of the rf chip 10 to complete a receiving operation of the rf signal.

The first duplexer 31 is configured to process a signal in a B28 frequency band, and the uplink frequency in the B28 frequency band is 703-748 MHz.

When the radio frequency circuit 300 registers to the middle channel in the B28 frequency band, the fixed end 61 of the single-pole double-throw switch 60 is controlled to be communicated with the second gating end 63, and the middle channel in the B28 frequency band is suppressed through the high-pass filter 70.

Wherein the insertion loss value of the high-pass filter 70 for the intermediate channel is greater than a first insertion loss threshold.

Wherein the intermediate channel is 710 MHz.

Wherein, when the radio frequency circuit 300 registers to other channels besides the middle channel in the B28 frequency band, the fixed end 61 of the control single-pole double-throw switch 60 is communicated with the first gating end 62.

Wherein, the insertion loss value of the high-pass filter 70 for other channels than the middle channel in the B28 frequency band is smaller than the second insertion loss threshold value.

The insertion loss value of the HPF high-pass filter 70 is adjusted according to the design requirement, specifically, the insertion loss value required in the 710MHz band should be greater than 21dB, and the insertion loss value required in the 720MHz-748MHz band should be less than 1 dB. For example, the first insertion loss threshold is set to 21dB, and the second insertion loss threshold is set to 1 dB.

The insertion loss value is greater than 21dB, which means that when the 710MHz radio frequency signal passes through the HPF high pass filter 70, the loss is greater than 21 dB. The insertion loss value is less than 1dB, which means that when the radio frequency signal of 720MHz-748MHz passes through the HPF high pass filter 70, the loss is less than 1 dB. It will be appreciated that the above-described impairment values for comparison with the first impairment threshold and the second impairment threshold are absolute impairment values.

For example, fig. 4 shows a characteristic diagram of a high-pass filter, wherein the curve in the diagram represents a characteristic curve of the high-pass filter, wherein the abscissa represents a frequency value and the ordinate represents an insertion loss value, which is represented by a negative number. The point m1 shows that the insertion loss value is-21.636 dB when the signal of 710MHz passes through the high pass filter. The point m2 indicates that the insertion loss value is-1 dB when the 720MHz signal passes through the high pass filter.

For example, 710MHz may be understood as a special signal that needs to be avoided in the communication band of the embodiment of the present application, and the HPF high pass filter 70 may be adjusted to meet the corresponding insertion loss value.

Since NS _17 only tests the middle channel of B28, when the RF circuit 300 registers the middle channel of B28, the fixed terminal 61 of the SP2T SPDT 60 is controlled to communicate with the second pass terminal 63, and the B28 channel is processed by the HPF high pass filter 70 and then connected to the RF front-end component 40, which adds extra suppression to 710 MHz.

When registering to other channels, the fixed end 61 of the SP2T spdt switch 60 is connected to the first pass end 62, and the B28 channel is directly connected to the rf front-end module 40, thereby reducing channel insertion loss.

In the embodiment of the present application, when processing a B28 frequency band signal, compared to using two duplexers (B28A + B28B) in fig. 2, the embodiment of the present application only needs to use one duplexer and one high-pass filter (B28+ HPF), and the filter is relatively cheap compared to the duplexer, thereby achieving the effect of reducing cost.

The power amplifier 20 includes a first output end 21, a second output end 22, a third output end 23, a fourth output end 24, and a fifth output end 25, and the filtering unit 30 further includes a second duplexer 32, a third duplexer 33, a fourth duplexer 34, and a fifth duplexer 35;

the first output terminal 21 is connected to the first duplexer 31, the second output terminal 22 is connected to the second duplexer 32, the third output terminal 23 is connected to the third duplexer 33, the fourth output terminal 24 is connected to the fourth duplexer 34, and the fifth output terminal 25 is connected to the fifth duplexer 35.

The second duplexer 32, the third duplexer 33, the fourth duplexer 34, and the fifth duplexer 35 are all configured to process low-frequency band signals.

For example, the low frequency band signals include a B5 band, a B8 band, a B12 band, and a B13 band. The low frequency band signal may further include other low frequency signals outside the B5 frequency band, the B8 frequency band, the B12 frequency band, and the B13 frequency band, and the specific design manner is based on the frequency band requirement of the radio frequency circuit, which is not limited by the embodiment of the present application.

For example, the first duplexer 31 may be a duplexer for processing a B28 band, the second duplexer 32 may be a duplexer for processing a B5 band, the third duplexer 33 may be a duplexer for processing a B8 band, the fourth duplexer 34 may be a duplexer for processing a B12 band, and the fifth duplexer 35 may be a duplexer for processing a B13 band.

In view of the above, the radio frequency circuit provided in the embodiment of the present application includes a radio frequency chip, a power amplifier, a filtering unit, a radio frequency front end component, and an antenna, which are sequentially connected; the radio frequency chip comprises a transmitting end and a receiving end, the transmitting end is connected with the power amplifier, the receiving end is connected with the filtering unit, and the filtering unit comprises a first duplexer; first duplexer with still be connected with a single-pole double-throw switch and a high pass filter between the radio frequency front end subassembly, the stiff end of single-pole double-throw switch with first duplexer is connected, the first gating end of single-pole double-throw switch with the radio frequency front end subassembly is connected, the second gating end of single-pole double-throw switch with the first end of high pass filter is connected, the second end of high pass filter with the radio frequency front end subassembly is connected, can effectively reduce the route of radio frequency circuit and insert and decrease and manufacturing cost.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a mobile terminal 400 according to an embodiment of the present application. Mobile terminal 1200 may include antenna device 110, memory 120 including one or more computer-readable storage media (only one shown), input unit 130, display unit 140, sensor 150, audio circuitry 160, transmission module 170, processor 180 including one or more processing cores (only one shown), and power supply 190. Those skilled in the art will appreciate that the mobile terminal 1200 configuration illustrated in fig. 5 is not intended to be limiting of the mobile terminal 1200 and may include more or less components than those illustrated, or some components in combination, or a different arrangement of components.

Wherein:

the antenna device 110 includes the rf circuit 300 described in any of the above embodiments. The antenna device 110 can communicate with a network device (e.g., a server) or other mobile terminal (e.g., a smart phone) through a wireless network, so as to complete information transceiving with the network device or other mobile terminal.

The rf circuit 300 is configured to receive and transmit electromagnetic waves, and achieve interconversion between the electromagnetic waves and electrical signals, so as to communicate with a communication network or other devices. The radio frequency circuit 300 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. The rf circuit 300 may communicate with various networks such as the internet, an intranet, a wireless network, or with other devices via 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 Data GSM Environment (EDGE), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Wireless Fidelity (Wi-Fi) (e.g., IEEE802.11 a, IEEE802.11 b, IEEE802.1 g and/or IEEE802.1 n), Voice over Internet Protocol (VoIP), world wide Internet Protocol (Microwave Access for Wireless communications, Wi-Max), and other short message protocols, as well as any other suitable communication protocols, and may even include those that have not yet been developed.

Memory 120 may be used to store software programs and modules, and memory 120 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, memory 120 may further include memory located remotely from processor 180, which may be connected to mobile terminal 1200 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.

The input unit 130 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, the input unit 130 may include a touch-sensitive surface 131 as well as other input devices 132. The touch-sensitive surface 131, also referred to as a touch display screen or a touch pad, may collect touch operations by a user on or near the touch-sensitive surface 131 (e.g., operations by a user on or near the touch-sensitive surface 131 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 touch sensitive surface 131 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 the processor 180, and can receive and execute commands sent by the processor 180. Additionally, the touch-sensitive surface 131 may be implemented using various types of resistive, capacitive, infrared, and surface acoustic waves. In addition to the touch-sensitive surface 131, the input unit 130 may also include other input devices 132. In particular, other input devices 132 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.

The display unit 140 may be used to display information input by or provided to the user and various graphic user interfaces of the mobile terminal 1200, which may be configured by graphics, text, icons, video, and any combination thereof. The display unit 140 may include a display panel 141, and optionally, the display panel 141 may be configured in the form of an LCD (Liquid crystal display), an OLED (Organic Light-Emitting Diode), or the like. Further, the touch-sensitive surface 131 may cover the display panel 141, and when a touch operation is detected on or near the touch-sensitive surface 131, the touch operation is transmitted to the processor 180 to determine the type of the touch event, and then the processor 180 provides a corresponding visual output on the display panel 141 according to the type of the touch event. Although in FIG. 5, touch-sensitive surface 131 and display panel 141 are shown as two separate components to implement input and output functions, in some embodiments, touch-sensitive surface 131 may be integrated with display panel 141 to implement input and output functions.

The mobile terminal 1200 may also include at least one sensor 150, 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 the display panel 141 according to the brightness of ambient light, and a proximity sensor that may turn off the display panel 141 and/or the backlight when the mobile terminal 1200 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 in the mobile terminal 1200, detailed descriptions thereof are omitted.

Audio circuitry 160, speaker 161, and microphone 162 may provide an audio interface between a user and mobile terminal 1200. The audio circuit 160 may transmit the electrical signal converted from the received audio data to the speaker 161, and convert the electrical signal into a sound signal for output by the speaker 161; on the other hand, the microphone 162 converts the collected sound signal into an electrical signal, which is received by the audio circuit 160 and converted into audio data, which is then processed by the audio data output processor 180 and then transmitted to another terminal via the rf circuit 300, or the audio data is output to the memory 120 for further processing. The audio circuitry 160 may also include an earbud jack to provide communication of peripheral headphones with the mobile terminal 1200.

The mobile terminal 1200, which may assist the user in e-mail, web browsing, and streaming media access through the transmission module 170 (e.g., Wi-Fi module), provides the user with wireless broadband internet access. Although fig. 5 illustrates the transmission module 170, it is understood that it does not belong to the essential constitution of the mobile terminal 1200, and may be omitted entirely within the scope not changing the essence of the invention as needed.

The processor 180 is a control center of the mobile terminal 1200, connects various parts of the entire mobile phone using various interfaces and lines, and performs various functions of the mobile terminal 1200 and processes data by operating or executing software programs and/or modules stored in the memory 120 and calling data stored in the memory 120, thereby integrally monitoring the mobile phone. Optionally, processor 180 may include one or more processing cores; in some embodiments, the processor 180 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 into the processor 180.

The mobile terminal 1200 also includes a power supply 190 (e.g., a battery) that powers the various components and, in some embodiments, may be logically coupled to the processor 180 via a power management system that may be used to manage charging, discharging, and power consumption management functions. The power supply 190 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 1200 may further include a camera (e.g., a front camera, a rear camera), a bluetooth module, and the like, which are not described in detail herein. Specifically, in the present embodiment, the display unit 140 of the mobile terminal 1200 is a touch screen display, and the mobile terminal 1200 further includes a memory 120 and one or more programs, wherein the one or more programs are stored in the memory 120 and configured to be executed by the one or more processors 180 to execute instructions of the one or more programs.

In addition, the mobile terminal 400 may further include a camera module, a bluetooth module, and the like, which will not be described herein.

The radio frequency circuit, the antenna device and the mobile terminal provided in the embodiments of the present application are described in detail above, and specific examples are applied herein to illustrate 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 circuit is characterized by comprising a radio frequency chip, a power amplifier, a filtering unit, a radio frequency front end component and an antenna which are sequentially connected;

2. The RF circuit of claim 1 wherein the first duplexer is configured to process signals in a B28 frequency band, and the uplink frequency in the B28 frequency band is 703-748 MHz.

3. The RF circuit of claim 2, wherein when the RF circuit registers to an intermediate channel in the B28 band, a fixed end of the SPDT switch is controlled to communicate with a second gate end, and the intermediate channel in the B28 band is suppressed by the high pass filter.

4. The radio frequency circuit of claim 3, wherein an insertion value of the high pass filter for the intermediate channel is greater than a first insertion threshold.

5. A radio frequency circuit according to claim 3, wherein the intermediate channel is 710 MHz.

6. The radio frequency circuit according to claim 3, wherein when the radio frequency circuit registers to a channel other than the middle channel in the B28 frequency band, the fixed end of the single-pole double-throw switch is controlled to be communicated with the first gating end.

7. The radio frequency circuit according to claim 1, wherein the power amplifier includes a first output terminal, a second output terminal, a third output terminal, a fourth output terminal, and a fifth output terminal, and the filtering unit further includes a second duplexer, a third duplexer, a fourth duplexer, and a fifth duplexer;

8. The RF circuit of claim 7, wherein the second duplexer, the third duplexer, the fourth duplexer, and the fifth duplexer are configured to process low-frequency band signals.

9. An antenna arrangement comprising a radio frequency circuit as claimed in any one of claims 1 to 8.

10. A mobile terminal, characterized by comprising a housing and a circuit board, wherein the circuit board is mounted inside the housing, and a radio frequency circuit is arranged on the circuit board, and the radio frequency circuit is the radio frequency circuit according to any one of claims 1 to 8.