CN114095048A

CN114095048A - Radio frequency system and communication equipment

Info

Publication number: CN114095048A
Application number: CN202111449066.5A
Authority: CN
Inventors: 陈锋; 仝林
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-02-25
Anticipated expiration: 2041-11-30
Also published as: CN114095048B

Abstract

The present application relates to a radio frequency system and a communication device, the radio frequency system including a radio frequency transceiver, a first transceiver circuit, a second transceiver circuit, and a diversity reception circuit, the first transceiver circuit and the diversity reception circuit being configured to switchably connect a first antenna and a second antenna, the second transceiver circuit being configured to connect a third antenna, the diversity reception circuit being configured to connect a fourth antenna. The first transceiver circuit supports transmission and main set reception of low frequency signals, the second transceiver circuit supports transmission and main set MIMO reception of low frequency signals, and the diversity reception circuit supports diversity reception of low frequency signals and diversity MIMO reception. Therefore, the radio frequency system can support double-path transmission and 4 x 4MIMO functions of low-frequency signals, and when the radio frequency system is located at the edge of a cell, deep in a building, in an elevator and other weak signal environments, compared with the radio frequency system which can only support 2 x 2MIMO reception of the low-frequency signals in the related art, the radio frequency system can improve the diversity gain by one time, the coverage distance is increased by one time, and the receiving performance is greatly improved.

Description

Radio frequency system and communication equipment

Technical Field

The present application relates to the field of antenna technologies, and in particular, to a radio frequency system and a communication device.

Background

With the development and progress of the technology, mobile communication technology is gradually beginning to be applied to communication devices such as mobile phones and the like. With the development and progress of the technology, the 5G mobile communication technology is gradually beginning to be applied to electronic devices. The 5G mobile communication technology communication frequency is higher than that of the 4G mobile communication technology. The conventional radio frequency system has poor receiving performance for receiving 5G low-frequency signals (for example, signals in N28 frequency band) in poor signal areas such as cell edge, building deep or elevator.

Disclosure of Invention

The embodiment of the application provides a radio frequency system and communication equipment, which can improve the receiving performance of low-frequency signals.

A radio frequency system, comprising:

a radio frequency transceiver;

the first transceiving circuit is connected with the radio frequency transceiver and is used for supporting the transmission and the main set reception of low-frequency signals;

the second transceiving circuit is connected with the radio frequency transceiver and is used for supporting the transmission of low-frequency signals and the MIMO (multiple input multiple output) reception of the main set;

the diversity receiving circuit is connected with the radio frequency transceiver and is used for supporting diversity reception and diversity MIMO reception of the low-frequency signal;

wherein the first transceiver circuitry and the diversity receive circuitry are configured to switchably connect a first antenna and a second antenna, respectively, the second transceiver circuitry is configured to connect a third antenna, the diversity receive circuitry is further configured to connect a fourth antenna, the diversity receive circuitry is to support diversity reception of the low frequency signals through the first antenna or the second antenna and diversity MIMO reception of the low frequency signals through the fourth antenna.

A communication device comprising a radio frequency system as described above.

The radio frequency system comprises a radio frequency transceiver, a first transceiver circuit, a second transceiver circuit and a diversity receiving circuit; also included are a first antenna, a second antenna, a third antenna, and a fourth antenna, the first transceiver circuitry and the diversity receive circuitry configured to switchably connect the first antenna and the second antenna, the second transceiver circuitry configured to connect the third antenna, and the diversity receive circuitry further configured to connect the fourth antenna. The first transceiver circuit supports the transmission and main set reception of low-frequency signals through the first antenna or the second antenna, the second transceiver circuit supports the transmission and main set MIMO reception of the low-frequency signals through the third antenna, and the diversity receiving circuit supports the diversity reception of the low-frequency signals through the first antenna or the second antenna and supports the diversity MIMO reception of the low-frequency signals through the fourth antenna. Therefore, the radio frequency system can support two-way transmission and 4 x 4MIMO function to the low frequency signal, can improve the throughput to the low frequency signal by times. When the radio frequency system is in an environment with good signals, the downlink communication rate can be doubled compared with the radio frequency system which can only support low-frequency signal 2 x 2MIMO reception in the related art. When the radio frequency system is located at the edge of a cell, deep in a building, in an elevator and other weak signal environments, compared with the radio frequency system which can only support low-frequency signal 2 x 2MIMO receiving in the related technology, the diversity gain can be doubled, the coverage distance is doubled, and the receiving performance is greatly improved. Therefore, compared with the radio frequency system supporting low-frequency signal 2 x 2MIMO reception in the related art, the radio frequency system of the embodiment doubles the downlink communication rate and the coverage distance, and can further improve the reception performance of the radio frequency system on the low-frequency signal.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a diagram illustrating an exemplary RF system;

FIG. 2 is a schematic diagram of the location of an antenna in one embodiment;

FIG. 3 is a second schematic diagram of an embodiment of an RF system;

FIG. 4 is a third exemplary diagram of an RF system;

FIG. 5 is a fourth schematic diagram of an embodiment of a radio frequency system;

FIG. 6 is a fifth schematic diagram of an embodiment of an RF system;

fig. 7 is a schematic diagram illustrating a specific structure of a first transceiver circuit according to an embodiment;

FIG. 8 is a second exemplary schematic diagram of a first transceiver circuit;

FIG. 9 is a sixth schematic diagram of an embodiment of an RF system;

FIG. 10 is a seventh schematic diagram illustrating an exemplary RF system;

fig. 11 is a third exemplary schematic diagram of a first transceiver circuit according to an embodiment;

FIG. 12 is a fourth exemplary schematic diagram of a first transceiver circuit;

FIG. 13 is an eighth schematic block diagram of an exemplary RF system;

FIG. 14 is a ninth illustration of a schematic structural diagram of an RF system in one embodiment;

FIG. 15 is a fifth exemplary schematic diagram of a first transceiver circuit;

FIG. 16 is a sixth exemplary schematic diagram of a first transceiver circuit;

FIG. 17 is a tenth block diagram of an exemplary RF system;

FIG. 18 is an eleventh illustration of a schematic structural diagram of a radio frequency system in one embodiment;

FIG. 19 is a twelfth schematic block diagram of an exemplary RF system;

FIG. 20 is a thirteen schematic structural diagram of an RF system in one embodiment;

FIG. 21 is a fourteenth illustrative block diagram of an embodiment of a radio frequency system;

FIG. 22 is a fifteen schematic block diagram of an exemplary RF system;

fig. 23 is one of specific structural diagrams of a diversity receiving circuit in an embodiment;

FIG. 24 is a second exemplary schematic diagram of an embodiment of a diversity receiver circuit;

FIG. 25 is a diagram illustrating an exemplary RF system;

FIG. 26 is a second exemplary schematic diagram of an embodiment of an RF system;

fig. 27 is a schematic configuration diagram of a communication apparatus in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first client may be referred to as a second client, and similarly, a second client may be referred to as a first client, without departing from the scope of the present application. Both the first client and the second client are clients, but they are not the same client.

The radio frequency system according to the embodiment of the present application may be applied to a communication device having a wireless communication function, where the communication device may be a handheld device, a vehicle-mounted device, a wearable device, a computing device or other processing devices connected to a wireless modem, and various forms of User Equipment (UE) (e.g., a Mobile phone), a Mobile Station (MS), and the like. For convenience of description, the above-mentioned devices are collectively referred to as a communication device.

As shown in fig. 1, in one embodiment, a radio frequency system provided in the embodiment of the present application includes: a radio frequency transceiver 10, a first transceiver circuit 20, a second transceiver circuit 30 and a diversity receiving circuit 40; the antenna further includes a first antenna ANT1, a second antenna ANT2, a third antenna ANT3, and a fourth antenna ANT4 (fig. 1 illustrates a structure in which the first transceiver circuit 20 is connected to the first antenna ANT1, and the diversity receiving circuit 40 is connected to the second antenna ANT2, which is only an illustration and not a limitation).

Wherein the radio frequency system is configured to support dual transmission of low frequency signals and 4 x 4MIMO reception functionality. The MIMO (Multiple Input Multiple Output, Multiple transmission and Multiple reception) technology is to use Multiple transmitting antennas and Multiple receiving antennas at a transmitting port and a receiving port, respectively, to fully utilize space resources, and implement Multiple transmission and Multiple reception through Multiple antennas, so that channel capacity of a system can be increased by Multiple times without increasing spectrum resources and antenna transmitting power.

The first antenna ANT1, the second antenna ANT2, the third antenna ANT3 and the fourth antenna ANT4 are all capable of supporting the transmission and reception of low-frequency signals in the NR frequency band. Each branch antenna may be formed using any suitable type of antenna. For example, each branch antenna may include an antenna with a resonating element formed from the following antenna structure: at least one of an array antenna structure, a loop antenna structure, a patch antenna structure, a slot antenna structure, a helical antenna structure, a strip antenna, a monopole antenna, a dipole antenna, and the like. Different types of antennas may be used for different frequency bands and frequency band combinations. In the embodiment of the present application, the types of the first antenna ANT1, the second antenna ANT2, the third antenna ANT3, and the fourth antenna ANT4 are not further limited.

The low-frequency signal may include a radio frequency signal in a low-frequency band, or may include radio frequency signals in a plurality of low-frequency bands. The radio frequency signal may include at least one of a 4G LTE low frequency signal and a 5G NR low frequency signal. The frequency band division of the low frequency signal is shown in table 1.

TABLE 1 frequency band division table for low frequency signals

It should be noted that, in the 5G network, the frequency band used by 4G is used, only the identifier before the serial number is changed, and the plurality of low frequency bands of the low frequency signal are not limited to the above example.

Optionally, the low frequency signals include N5, N8, N20, N28 and N71 band signals, and the radio frequency system may support 4 × 4MIMO receiving functions of N5, N8, N20, N28 and N71 band signals.

In the present embodiment, the rf transceiver 10 may be configured with a plurality of ports to realize the connection with the first transceiver circuit 20, the second transceiver circuit 30 and the diversity receiving circuit 40. Alternatively, the radio frequency transceiver 10 includes a transmitter for transmitting low frequency signals to the first transceiver circuit 20 and the second transceiver circuit 30, and a receiver for receiving low frequency signals output by the first transceiver circuit 20, the second transceiver circuit 30, and the diversity receiving circuit 40.

In the present embodiment, the first transceiver circuit 20 is connected to the radio frequency transceiver 10 for supporting transmission and main set reception of low frequency signals; the second transceiver circuit 30 is respectively connected to the rf transceiver 10, and is configured to support transmitting low-frequency signals and MIMO receiving of the main set; the diversity receive circuit 40 is connected to the radio frequency transceiver 10 for supporting diversity reception of low frequency signals and diversity MIMO reception. The first transceiver circuit 20, the second transceiver circuit 30 and the diversity receiving circuit 40 can support two-way transmission of low frequency signals and 4 × 4MIMO receiving functions.

Wherein the first transceiving circuit 20 and the diversity receiving circuit 40 are respectively configured to switchably connect the first antenna ANT1 and the second antenna ANT2, the second transceiving circuit 30 is configured to connect the third antenna ANT3, the diversity receiving circuit 40 is further configured to connect the fourth antenna ANT4, the diversity receiving circuit 40 is configured to support diversity reception of low frequency signals through the first antenna ANT1 and the second antenna ANT2 and to support diversity MIMO reception of low frequency signals through the fourth antenna ANT 4. Thus, an antenna switching function is supported between the first antenna ANT1 and the second antenna ANT2, and transmission, primary set reception, and diversity reception of low frequency signals can be supported.

Optionally, the antenna efficiencies of the first antenna ANT1 and the second antenna ANT2 are higher than the efficiencies of the third antenna ANT3 and the fourth antenna ANT4, the target antenna is any one of the first antenna ANT1 and the second antenna ANT2, the uplink signal can be distributed on the first antenna ANT1 or the second antenna ANT2 with better antenna efficiency, and the reliability of the uplink signal can be ensured to improve the communication performance of the radio frequency system. Alternatively, as shown in fig. 2, the first antenna ANT1 and the second antenna ANT2 are respectively disposed on the top frame 101 and the bottom frame 103 of the communication device, and the third antenna ANT3 and the fourth antenna ANT4 are disposed on both side frames 102, 104 of the communication device, so that the efficiency of each of the first antenna ANT1 and the second antenna ANT2 is higher than that of each of the third antenna ANT3 and the fourth antenna ANT 4.

Optionally, the radio frequency transceiver 10 may be further configured to configure a target antenna received by the main set of the first transceiver circuit 20 according to the network information of the low frequency signal received by the first transceiver circuit 20 and the diversity receiving circuit 40, where the target antenna is one of the first antenna ANT1 and the second antenna ANT 2. The network information may include raw and processed information associated with wireless performance metrics of the Received low frequency Signal, such as Signal Strength, Received Power, Reference Signal Received Power (RSRP), Received Signal Strength (RSSI), Signal to Noise Ratio (SNR), Rank of MIMO channel matrix (Rank), Carrier to Interference and Noise Ratio (RS-CINR), frame error rate, bit error rate, Reference Signal Reception Quality (RSRQ), and the like. Further alternatively, the radio frequency transceiver 10 may store in advance configuration information of connection of each circuit with each antenna. The configuration information may include identification information of the antennas, identification information of each circuit, and control logic information of each switch on the rf path between the first transceiver circuit 20 and the diversity receiving circuit 40 and the first antenna ANT1 and the second antenna ANT2, respectively.

Taking the network information as the received signal strength as an example, the first antenna ANT1 is configured as a default target antenna for transmitting and receiving the low frequency signal, and if the difference between the second signal strength of the low frequency signal received by the second antenna ANT2 and the first signal strength of the low frequency signal received by the first antenna ANT1 is greater than or equal to a preset threshold value within a preset time period, the second antenna ANT2 is configured as a target antenna.

Specifically, when the first antenna ANT1 is configured as a default target antenna for transmission and main set reception of low frequency signals, the radio frequency transceiver 10 receives the low frequency signals received by the first antenna ANT1 and the second antenna ANT2 through the first transceiving circuit 20 and the diversity receiving circuit 40, respectively, and controls switching of the antennas according to a first signal strength of the low frequency signals received by the first antenna ANT1 and a second signal strength of the low frequency signals received by the second antenna ANT 2. More specifically, if the difference between the second received signal strength and the first received signal strength is greater than or equal to the preset threshold value within the preset time, the second antenna ANT2 is used as the target antenna. After determining the target antenna, the rf transceiver 10 may control an associated logic switch of the rf system to open a transceiving path between the second antenna ANT2 and the first transceiving circuit 20 and open a receiving path between the first antenna ANT1 and the diversity receiving circuit 40, so as to implement transmission and main set reception of the low frequency signal by using the second antenna ANT2, thereby improving the communication quality of the low frequency signal. If the difference is smaller than the preset threshold, the first antenna ANT1 is continuously used as the default target antenna, and the current working state is maintained. The preset threshold values are all numerical values larger than zero, and the size of the preset threshold values can be set according to needs. By setting the judgment condition of the preset threshold, frequent switching between the antennas caused by the fact that the signal receiving strength of the antennas is likely to be constantly changing can be prevented, and further the influence of the transmission efficiency of the antennas can be reduced.

The first transceiver circuit 20 includes a transmitting path TX1 and a main set receiving path RX1, where the transmitting path TX1 of the first transceiver circuit 20 performs amplification processing and filtering processing on a low-frequency signal input by the radio frequency transceiver 10, and transmits the low-frequency signal after power amplification and filtering processing to the first antenna ANT1 or the second antenna ANT 2; the main set receiving path RX1 of the first transceiver circuit 20 performs amplification processing and filtering processing on the low frequency signal received by the first antenna ANT1 or the second antenna ANT2, and outputs the power-amplified and filtered low frequency signal to the radio frequency transceiver 10. The transmit path TX1 of the first transceiver circuitry 20 may be provided with a power amplifier and a duplexer to implement the amplification function and the filtering function, and the main set receive path RX1 of the first transceiver circuitry 20 may be provided with a low noise amplifier and a duplexer to implement the amplification function and the filtering function. Alternatively, the transceiving path of the first transceiving circuit 20 may be separately selected by a duplexer provided on the transceiving path.

The second transceiver circuit 30 includes a transmit path TX2 and a main MIMO receive path RX2, where the transmit path TX2 of the second transceiver circuit 30 performs amplification processing and filtering processing on a low-frequency signal input by the radio frequency transceiver 10, and transmits the low-frequency signal after power amplification and filtering processing to the third antenna ANT 3; the master MIMO reception path RX2 of the second transceiver circuit 30 performs amplification processing and filtering processing on the low frequency signal received by the third antenna ANT3, and outputs the power-amplified and filtered low frequency signal to the radio frequency transceiver 10. The transmit path TX2 of the second transceiver circuit 30 may be provided with a power amplifier and a duplexer to implement an amplification function and a filtering function, and the main set MIMO receive path RX2 of the second transceiver circuit 30 may be provided with a low noise amplifier and a duplexer to implement an amplification function and a filtering function. Alternatively, the transceiving path of the second transceiving circuit 30 may be separately selected by a duplexer provided on the transceiving path.

The diversity receiving circuit 40 includes a receiving path RX3 and a receiving path RX4, the receiving path RX3 performs amplification processing and filtering processing on the low frequency signal received by the second antenna ANT2 or the first antenna ANT1, and outputs the low frequency signal after the amplification processing and the filtering processing to the radio frequency transceiver 10, and the receiving path RX4 performs amplification processing and filtering processing on the low frequency signal received by the fourth antenna ANT4, and outputs the low frequency signal after the amplification processing and the filtering processing to the radio frequency transceiver 10.

The radio frequency system provided by the present embodiment includes a radio frequency transceiver 10, a first transceiver circuit 20, a second transceiver circuit 30, and a diversity receiving circuit 40; further included are a first antenna ANT1, a second antenna ANT2, a third antenna ANT3 and a fourth antenna ANT4, the first transceiver circuit 20 and the diversity receive circuit 40 are configured to switchably connect the first antenna ANT1 and the second antenna ANT2, the second transceiver circuit 30 is configured to connect the third antenna ANT3, the diversity receive circuit 40 is further configured to connect the fourth antenna ANT 4. Among them, the first transceiver circuit 20 supports transmission and main set reception of low frequency signals through the first antenna ANT1 or the second antenna ANT2, the second transceiver circuit 30 supports transmission and main set MIMO reception of low frequency signals through the third antenna ANT3, and the diversity reception circuit 40 supports diversity reception of low frequency signals through the first antenna ANT1 or the second antenna ANT2 and diversity MIMO reception of low frequency signals through the fourth antenna ANT 4. Therefore, the radio frequency system can support two-way transmission and 4 x 4MIMO function to the low frequency signal, can improve the throughput to the low frequency signal by times. When the radio frequency system is in an environment with good signals, the downlink communication rate can be doubled compared with the radio frequency system which can only support low-frequency signal 2 x 2MIMO reception in the related art. When the radio frequency system is located at the edge of a cell, deep in a building, in an elevator and other weak signal environments, compared with the radio frequency system which can only support low-frequency signal 2 x 2MIMO receiving in the related technology, the diversity gain can be doubled, the coverage distance is doubled, and the receiving performance is greatly improved. Therefore, compared with the radio frequency system supporting low-frequency signal 2 x 2MIMO reception in the related art, the radio frequency system of the embodiment doubles the downlink communication rate and the coverage distance, and can further improve the reception performance of the radio frequency system on the low-frequency signal.

In one embodiment, as shown in fig. 3, the rf system further includes:

the switching circuit 50 is connected to the first transceiver circuit 20, the diversity receiver circuit 40, the first antenna ANT1, and the second antenna ANT2, respectively, and is configured to switchably connect the first transceiver circuit 20 and the diversity receiver circuit 40 to the first antenna ANT1 and the second antenna ANT 2. For the description of the first transceiver circuit 20 and the diversity receiving circuit 40, refer to the above embodiments, and are not described herein again.

By providing the switching circuit 50, the first transceiver circuit 20 and the diversity receiving circuit 40 may be selectively connected to the first antenna ANT1 and the second antenna ANT2 in a switchable manner, and a target antenna may be determined from the first antenna ANT1 and the second antenna ANT2, so that the target antenna may perform transmission and main set reception, and thus an uplink signal may be distributed on the first antenna ANT1 or the second antenna ANT2 with better antenna efficiency, and reliability of the uplink signal may be ensured to improve communication performance of the operation of the radio frequency system.

The switching circuit 50 may be a switch circuit, and the switching circuit 50 may selectively turn on a transceiving path between the first transceiving circuit 20 and the first antenna ANT1 and a receiving path between the diversity receiving circuit 40 and the second antenna ANT2, or may selectively turn on a transceiving path between the first transceiving circuit 20 and the second antenna ANT2 and a receiving path between the diversity receiving circuit 40 and the first antenna ANT 1. Further, the switching logic of the switching circuit 50 may be configured by the radio frequency transceiver 10, which is specifically described in the above embodiment and is not described herein again.

Alternatively, as shown in fig. 4, the switching circuit 50 may be a double-pole double-throw switch DPDT1, two first ends of the switching circuit 50 are respectively connected to the first transceiver circuit 20 and the diversity receiving circuit 40 in a one-to-one correspondence manner, and two second ends of the switching circuit 50 are respectively connected to the first antenna ANT1 and the second antenna ANT2 in a one-to-one correspondence manner.

In one embodiment, the first transceiver circuit 20 includes:

a first transmitting module configured with a first antenna port LB ANT1, the first transmitting module including a transmitting unit, an input end of the transmitting unit being connected to the radio frequency transceiver 10, the transmitting unit being configured to amplify the received low frequency signal and output the amplified low frequency signal; a first receiving module, connected to the radio frequency transceiver 10, for supporting main set reception of low frequency signals; and the first filtering module is respectively connected with the output end of the transmitting unit, the first antenna port LB ANT1 and the first receiving module, and is used for filtering stray waves except the low-frequency signals and separating the transceiving path of the low-frequency signals according to the signal direction of the low-frequency signals.

The first receiving module, the first filtering module and the first antenna ANT1 form a main set receiving path of the first transceiver circuit 20 to implement main set receiving of the first transceiver circuit 20, and the first transmitting module, the first filtering module and the first antenna ANT1 or the second antenna ANT2 form a transmitting path of the first transceiver circuit 20 to implement transmitting of the first transceiver circuit 20. The first receiving module is used for amplifying the low-frequency signals, the first transmitting module comprises a transmitting unit, and the transmitting unit is used for amplifying the received low-frequency signals and outputting the amplified low-frequency signals. Alternatively, the transmitting unit may be a power amplifier, so as to implement a power amplification process on the received low-frequency signal. Optionally, the first receiving module may include a low noise amplifier, so as to implement a low noise amplification process on the received low frequency signal.

The first filtering module is directly or indirectly connected to the output end of the transmitting unit, the first antenna port LB ANT1 and the first receiving module, respectively, so as to implement the connection between the first receiving module and the first antenna ANT1 or the second antenna ANT2 through the first antenna port LB ANT1, and implement the connection between the transmitting unit of the first transmitting module and the first antenna ANT1 or the second antenna ANT2 through the first antenna port LB ANT1, and the first filtering module can filter the low-frequency signals received and transmitted by the first transceiver circuit 20, so as to filter signals other than the low-frequency signals, and only output the low-frequency signals; the first filtering module may further separately implement a transceiving path of the low frequency signal according to a signal direction of the low frequency signal, so that the first transceiving circuit 20 implements transmitting and receiving of the low frequency signal.

Alternatively, the first filtering module may be disposed outside the first transmitting module, or may be integrated inside the first transmitting module, wherein when the first filtering module is integrated inside the first transmitting module, the first transmitting module may be understood as a Low-frequency Power Amplifier module (LB L-PA Mid, Low Band Power Amplifier Modules) with a built-in Low noise Amplifier. The first filtering module may be a duplexer, and when the low-frequency signal is a radio-frequency signal of a single low-frequency band, for example, a signal of N28 frequency band, the first filtering module may filter stray waves other than the N28 frequency band, and output only the signal of N28 frequency band to the first antenna port LB ANT1 or the first receiving module; when the low-frequency signal is a radio-frequency signal of a plurality of low-frequency bands, a plurality of first filtering modules or a plurality of duplexers may be provided for the first filtering module to filter each low-frequency signal, and output a plurality of low-frequency signals to the first antenna port LB ANT1 or the first receiving module.

In one embodiment, as shown in fig. 5 (fig. 5 shows the first transceiver circuit 20 connected to the first antenna ANT1, and only the first transceiver circuit 10, the first transceiver circuit 20, and the first antenna ANT1 are shown), the first transmitting module 201 is further configured with an output port RX configured to be connected to the first receiving module 202; wherein: the first filtering module 200 is connected to the output terminal of the transmitting unit 210, the first antenna port LB ANT1, and the output port RX, respectively, and the first filtering module 200 is connected to the first receiving module 202 through the output port RX. Therefore, the first filtering module 200 is integrated inside the first transmitting module 201, which can reduce the main board area occupied by the radio frequency system, improve the integration level of the device, facilitate the miniaturization of the device and reduce the cost; meanwhile, the insertion loss in the transmitting process and the receiving process can be reduced, the output power of the first transmitting module 201 and the first receiving module 202 to the low-frequency signal is improved, the sensitivity performance of the low-frequency signal is improved, and the communication performance of the radio frequency system can be improved.

In one embodiment, as shown in fig. 6 (fig. 6 shows the first transceiver circuit 20 connected to the first antenna ANT1, and only shows the rf transceiver 10, the first transceiver circuit 20 and the first antenna ANT1), the low frequency signal includes a plurality of rf signals in low frequency bands; the number of the first filtering module 200 and the number of the output ports RX are both multiple; the first transmission module 201 further includes:

a first gating unit 220, a first end of the first gating unit 220 being connected to the transmitting unit 210; a second gating unit 230, a first end of the second gating unit 230 being connected to the first antenna port LB ANT 1; two first ends of each first filtering module 200 are respectively connected to a second end of the first gating unit 220 and an output port RX in a one-to-one correspondence manner, second ends of the plurality of first filtering modules 200 are connected to a plurality of second ends of the second gating unit 230 in a one-to-one correspondence manner, and frequency bands of low-frequency signals output by each first filtering module 200 are different.

A first end of the first gating unit 220 is connected to the transmitting unit 210, a second end of the first gating unit 220 is connected to the first filtering module 200, a plurality of second ends of the second gating unit 230 are respectively connected to the plurality of first filtering modules 200 in a one-to-one correspondence manner, and a first end of the second gating unit 230 is connected to the first antenna port LB ANT 1. The first gating unit 220 is configured to selectively turn on a radio frequency path between the transmitting unit 210 and the first filtering module 200, and the second gating unit 230 is configured to selectively turn on a radio frequency path between the first filtering module 200 and the first antenna port LB ANT1 and between the output port RX and the first antenna port LB ANT 1. The first gating unit 220 and the second gating unit 230 are configured to jointly select and conduct the rf paths between the transmitting unit 210 and the first antenna port LB ANT1 and between the output port RX and the first antenna port LB ANT1, so that the first gating unit 220 and the second gating unit 230 may reduce the insertion loss of the first transmitting module 201 through the first gating unit 220 and the second gating unit 230 for the transmitting path and the receiving path of the low frequency signals, and further may improve the output power of the first transmitting module 201. Specifically, the first and

second gate units

220 and 230 are multi-channel selection switches, respectively.

In one embodiment, as shown in fig. 6, the first transmitting module 201 further includes:

and a coupling unit 240 respectively connected to the second gating unit 230 and the first antenna port LB ANT1, and configured to couple low-frequency signals in a radio frequency path between the second gating unit 230 and the first antenna port LB ANT 1.

Specifically, the first transmitting module 201 is further configured with a coupling output port CPLOUT, the coupling unit 240 is respectively connected with the second gating unit 230, the first antenna port LB ANT1, and the coupling output port CPLOUT, and couples the low-frequency signal in the radio frequency path between the second gating unit 230 and the first antenna port LB ANT1 to output the coupled signal through the coupling output port CPLOUT. More specifically, the coupling unit 240 includes an input terminal, an output terminal, and a coupling terminal. The input of the coupling unit 240 is coupled to the second gating unit 230, the output of the coupling unit 240 is coupled to the first antenna port LB ANT1, and the coupling end is coupled to the coupling output port CPLOUT. The coupling unit 240 couples a low-frequency signal in a radio frequency path between the second gating unit 230 and the first antenna port LB ANT1 to obtain a coupled signal, where the coupled signal includes a forward coupled signal and a reverse coupled signal, and forward power information of the low-frequency signal can be detected based on the forward coupled signal output by the coupling terminal; based on the reverse coupling signal output by the coupling terminal, the reverse power information of the low-frequency band signal can be correspondingly detected, and the detection mode is defined as a reverse power detection mode.

IN one embodiment, as shown IN fig. 6, the first transmitting module 201 may be further configured with an input port GSM LB IN, an input port GSM HB IN, and a high frequency output port GSM HB OUT. The first transmission module 201 further includes a 2G low frequency transmission unit 250 and a 2G high frequency transmission unit 260. The 2G low frequency transmitting unit 250 and the 2G high frequency transmitting unit 260 can respectively realize the amplification processing of the 2G low frequency signal and the 2G high frequency signal.

In one embodiment, as shown in fig. 7 (fig. 7 only shows the first transmitting module 201), the transmitting unit 210 includes a power amplifier LB PA1, the first gating unit 220 includes a multi-channel selection switch SP8T1, the second gating unit 230 includes a multi-channel selection switch SP8T2, and the first filtering module 200 is a duplexer DU. The input end of the power amplifier LB PA1 is connected with the input port LNA IN; the first end of the multichannel selection switch SP8T1 is connected with the output end of the power amplifier LB PA1, the second ends of the multichannel selection switch SP8T1 are respectively connected with the first ends of the plurality of duplexer DUs in a one-to-one correspondence manner, the first ends of the plurality of duplexer DUs are connected with the output port RX, the second ends of the plurality of duplexer DUs are connected with the second end of the multichannel selection switch SP8T2, and the first end of the multichannel selection switch SP8T2 is connected with the coupler Co 1.

Specifically, when the frequency band of the low-frequency signal is a preset frequency band, the power amplifier LB PA1 and a duplexer can support the related processing of the frequency band signal to correspondingly output the low-frequency signal without clutter; when the frequency band of the low-frequency signal is a plurality of preset frequency bands, a plurality of second ends of the multi-channel selection switch SP8T1 are respectively connected with the first ends of the plurality of first filtering modules 200 in a one-to-one correspondence manner, so that the power amplifier LB PA1 and the plurality of duplexers can also support the related processing of the low-frequency signals of a plurality of different frequency bands, and the low-frequency signals of each frequency band without clutter can be correspondingly output. It is understood that the power amplifier LB PA1, the multi-channel selection switch SP8T1, and the plurality of duplexers form filter paths in the plurality of transmit paths that are independent of each other and do not overlap each other. It should be noted that, when the transmitting unit 210 only needs to transmit low-frequency signals of one frequency band, the number of the second terminals of the multi-channel selection switch SP8T1 may be only one, and the number of the duplexers is one.

In one embodiment, as shown in fig. 7, the 2G low frequency transmitting unit 250 includes a power amplifier 2G LB PA and a filter F1; the 2G high frequency transmission unit 260 includes a power amplifier 2G HB PA and a filter F2. The input end of the power amplifier 2G LB PA is connected to the input port GSM LB IN, the output end of the power amplifier 2G LB PA is connected to the first end of the second gating unit 230 through the filter F1, the input end of the power amplifier 2G HB PA is connected to the input port GSM HB IN, and the output end of the power amplifier 2G HB PA is connected to the high-frequency output port GSM HB OUT through the filter F2. The power amplifier 2G LB PA and the power amplifier 2G HB PA are respectively configured to amplify the 2G low-frequency signal and the 2G high-frequency signal, and the filter F1 and the filter F2 are respectively configured to filter the 2G low-frequency signal and the 2G high-frequency signal.

Alternatively, on the basis of the embodiment of fig. 5, as shown in fig. 7 (fig. 7 only shows the first transceiver circuit 20), the first receiving module 202 includes: a low noise amplifier LNA1 and a gating cell, wherein the gating cell may be a multi-channel selection switch SP4T 1.

A low noise amplifier LNA1, an output terminal of the low noise amplifier LNA1 being connected to the radio frequency transceiver 10; a first terminal of the multi-channel selection switch SP4T1, a first terminal of the multi-channel selection switch SP4T1 is connected to the input terminal of the low noise amplifier LNA1, a second terminal of the multi-channel selection switch SP4T1 is connected to a first terminal of the first filtering module 200 through the output port RX, and is connected to the first antenna port LB ANT1 through the first filtering module to receive the low frequency signal input from the first antenna port LB ANT 1. The radio frequency path between the low noise amplifier LNA1 and the first antenna port LB ANT1 is selectively conducted through the multichannel selection switch SP4T1, so that 5G radio frequency signals of different frequency bands are selectively subjected to low noise amplification processing, the number of the low noise amplifiers LNA1 is saved, and the area of a mainboard occupied by devices is reduced. Note that, when low-noise amplification processing is required for low-frequency signals of a plurality of frequency bands, a plurality of low-noise amplifiers LNA1 (for example, two low-noise amplifiers LNA1) may be provided.

It should be noted that the first receiving module 202 may further be configured to connect the fifth antenna to support receiving the intermediate frequency signal and the high frequency signal, as shown in fig. 8, the first receiving module 202 may further include a multi-channel selection switch nPnT, a plurality of low noise amplifiers LNA2, and a multi-channel selection switch SP4T2, so as to receive the intermediate frequency signal and the high frequency signal.

For convenience of description, the signal transceiving process of the first transceiving circuit 20 in this embodiment is described by taking the low frequency signal as an N28 frequency band signal as an example:

emission process of N28 low-frequency signal: the rf transceiver 10 outputs an N28 transmit signal to the transmitting unit 210 of the first transmitting module 201 through the input port PA IN, amplifies the signal through the power amplifier LB PA1, performs filtering processing through the multi-channel selection switch SP8T1 and the duplexer, outputs the signal through the multi-channel selection switch SP8T2 and the coupler Co1 to the first antenna port LB ANT1, and finally reaches the first antenna ANT1 (taking the connection between the first transceiving circuit 20 and the first antenna ANT1 as an example).

Main set receiving process of N28 low frequency signal: the first antenna ANT1 (for example, the first transceiver circuit 20 is connected to the first antenna ANT1) receives a low-frequency signal N28 from the space, the low-frequency signal N28 enters the first transmitting module 201 through the first antenna port LB ANT1, enters the duplexer through the coupler Co1 and the multi-channel selector switch SP8T2 for filtering, and is output to the first receiving module 202 through the output port RX, and the low-noise amplifier LNA1 of the first receiving module 202 amplifies the low-frequency signal N28 and outputs the amplified signal to the radio frequency transceiver 10.

In one embodiment, as shown in fig. 9 (fig. 9 shows that the first transceiver circuit 20 is connected to the first antenna ANT1, and only the rf transceiver 10, the first transceiver circuit 20 and the first antenna ANT1 are shown), the first transmitter module 201 is further configured with an auxiliary transmitter port LB TXOU and an auxiliary transmitter port LB TRX, the auxiliary transmitter port LB TXOU is connected to the output end of the transmitter unit 210, and the auxiliary transmitter port LB TRX is connected to the first antenna port LB ANT 1; wherein:

two first ends of the first filtering module 203 are respectively connected with the auxiliary transmitting port LB TXOU and the first receiving module in a one-to-one correspondence manner, and a second end of the first filtering module 203 is connected with the auxiliary receiving/transmitting port LB TRX.

The transmitting unit 210 is referred to the related description of the above embodiments, and is not described herein again.

The first filtering module 203 is connected to the transmitting unit 210 through an auxiliary transmitting port LB TXOU and connected to the first antenna port LB ANT1 through an auxiliary transmitting/receiving port LB TRX, so that the first filtering module 203 is disposed outside the first transmitting module 201, and the low-frequency signal transmitted and received by the first transmitting/receiving circuit 20 can be filtered through the externally-mounted first filtering module 203, and isolation of the first filtering module 203 to the low-frequency signal is improved. It should be noted that, in other embodiments, a plurality of first filtering modules 203 may be externally disposed to implement filtering processing on low-frequency signals of a plurality of different frequency bands.

In one embodiment, as shown in fig. 10 (fig. 10 illustrates an example of the first transceiver circuit 20 connected to the first antenna ANT1, and only shows the first transceiver circuit 10, the first transceiver circuit 20 and the first antenna ANT1), the low frequency signal includes a plurality of low frequency band rf signals; the first transmitting module 201 is further configured with an output port RX configured for connecting the first receiving module 202, the first transmitting module 201 further comprising:

a first gating unit 220, a first end of the first gating unit 220 being connected to the output end of the transmitting unit 210, a second end of the first gating unit 220 being connected to the auxiliary transmitting port LB TXOU; a second gating unit 230, wherein a first terminal of the second gating unit 230 is connected to the first antenna port LB ANT1, and a second terminal of the second gating unit is connected to the auxiliary transceiving port LB TRX.

The two first ends of the filtering unit 270 are respectively connected to a second end of the first gating unit 220 and the output port RX in a one-to-one correspondence manner, the second end of the filtering unit 270 is connected to a second end of the second gating unit 230, and the filtering unit 270 is configured to filter spurious waves other than the low-frequency signal and separate a transceiving path of the low-frequency signal according to a signal direction of the low-frequency signal, and a frequency band of the low-frequency signal filtered by the filtering unit 270 is different from a frequency band of the low-frequency signal filtered by the first filtering module 203.

The frequency band of the low-frequency signal filtered by the filtering unit 270 is different from the frequency band of the low-frequency signal filtered by the first filtering module 203, so that the first transmitting module 201 can support the amplification processing and the filtering processing of the low-frequency signal in different frequency bands. The number of the filtering units 270 may be set to be one or more according to different numbers of frequency bands, and when the number of the filtering units 270 is multiple, the multiple filtering units 270 are connected to the multiple output ports RX in a one-to-one correspondence. Optionally, the first filtering module 203 is configured to filter out low-frequency signals of the primary frequency band, and the filtering unit 270 is configured to filter out low-frequency signals of other secondary frequency bands. Taking the low-frequency signals capable of being received and transmitted as signals of three different frequency bands as an example, one first filtering module 203 and two filtering units 270 may be provided to implement filtering processing on the low-frequency signals of the three frequency bands. The filtering unit 270 may be a duplexer.

A first end of the first gating unit 220 is connected to the output end of the transmitting unit 210, a second end of the first gating unit 220 is connected to the first filtering module 203, a second end of the second gating unit 230 is connected to the auxiliary transceiving port LB TRX or a plurality of second ends of the second gating unit 230 are connected to a plurality of auxiliary transceiving ports LB TRX, and a first end of the second gating unit 230 is connected to the first antenna port LB ANT 1. The first gating unit 220 is configured to selectively turn on a radio frequency path between the transmitting unit 210 and the first filtering module 200 and a radio frequency path between the transmitting unit 210 and the filtering unit 270, and the second gating unit 230 is configured to selectively turn on a radio frequency path between the first filtering module 203 and the first antenna port LB ANT1 and a radio frequency path between the filtering unit 270 and the first antenna port LB ANT 1. Accordingly, the first gating unit 220 and the second gating unit 230 are configured to jointly select and conduct the rf path between the transmitting unit 210 and the first antenna port LB ANT1 and the rf path between the output port RX and the first antenna port LB ANT1, so that the first gating unit 220 and the second gating unit 230 may reduce the insertion loss of the first transmitting module 201 through the first gating unit 220 and the second gating unit 230 with respect to the transmitting path and the receiving path of the plurality of low frequency signals, and further may boost the output power of the first transmitting module 201. Specifically, the first and

second gate units

220 and 230 are multi-channel selection switches, respectively.

In one embodiment, as shown in fig. 10, the first transmitting module 201 further includes:

and a coupling unit 240 respectively connected to the second gating unit 230 and the first antenna port LB ANT1, and configured to couple low-frequency signals in a radio frequency path between the second gating unit 230 and the first antenna port LB ANT 1. The description of the coupling unit 240 refers to the above embodiment, and is not repeated herein.

Optionally, as shown in fig. 10, the transmitting module 201 further includes: a 2G low frequency transmitting unit 250 and a 2G high frequency transmitting unit 260. The related description of the 2G low-frequency transmitting unit 250 and the 2G high-frequency transmitting unit 260 refers to the above embodiment, and is not repeated herein.

In one embodiment, as shown in fig. 11 (only the first transceiver circuit 20 is shown in fig. 11), the transmitting unit 210 includes a power amplifier LB PA1, the first gating unit 220 includes a multi-channel selection switch SP8T1, the second gating unit 230 includes a multi-channel selection switch SP8T2, the first filtering module is a duplexer DU1, the filtering unit 270 is a duplexer DU2, and the coupling unit 240 is a coupler Co 1.

In one embodiment, based on the embodiment of fig. 11, as shown in fig. 12 (fig. 12 only shows the first transceiver circuit 20), the first receiving module 202 includes:

a low noise amplifier LNA1, an output terminal of the low noise amplifier LNA1 being connected to the radio frequency transceiver 10; a first terminal of the multi-channel selection switch SP4T1, a first terminal of the multi-channel selection switch SP4T1 is connected to the input terminal of the low noise amplifier LNA1, a second terminal of the multi-channel selection switch SP4T1 is connected to a first terminal of the first filter module 202, and is connected to the first antenna port LB ANT1 through the first filter module 202 to receive the low frequency signal input from the first antenna port LB ANT 1. The detailed description of the low noise amplifier LNA1 and the multi-channel selection switch SP4T1 refers to the detailed description of the above embodiments, and is not repeated here.

It should be noted that the first receiving module 202 may further be configured to connect the fifth antenna to support receiving the intermediate-frequency signal and the high-frequency signal, as shown in fig. 12, the first receiving module 202 may further include a plurality of low noise amplifiers LNA2 and a multi-channel selection switch SP4T2, so as to receive the intermediate-frequency signal and the high-frequency signal.

For convenience of description, the signal transceiving process of the first transceiving path 20 in this embodiment is described by taking the low frequency signal as an N28 frequency band signal as an example:

emission process of N28 low-frequency signal: the rf transceiver 10 outputs an N28 transmit signal to the first transmit module 201 through the input port LAN IN, performs signal amplification through the power amplifier LB PA1, outputs the signal to the auxiliary transmit port LB TXOU through the multi-channel select switch SP8T1, and reaches the first filter module 203, where the first filter module 203 performs filtering processing, and then outputs the signal to the first antenna port LB ANT1 through the auxiliary transmit/receive port LB TRX, the multi-channel select switch SP8T2, and the coupler Co1, and finally reaches the first antenna ANT1 (taking the connection between the first transmit/receive circuit and the first antenna ANT1 as an example).

Main set receiving process of N28 low frequency signal: the first antenna ANT1 (for example, the first transceiver circuit is connected to the first antenna ANT1) receives a low-frequency signal N28 from the space, the low-frequency signal N28 enters the first transmitter module 201 through the first antenna port LB ANT1, enters the first filter module 203 through the coupler Co1, the multi-channel selector switch SP8T2 and the auxiliary transceiver port LB _ TRX, is filtered, enters the low-noise amplifier LNA1 of the first receiver module 202 through the auxiliary output port LNA OUT, is amplified, and is output to the radio frequency transceiver 10.

In some embodiments, as shown in fig. 13 and 14, the first transmitting module 201 further includes:

the switching unit 280 is respectively connected to the first filtering module, the first switching port ANT101, the second switching port ANT102 and the connection port CAX, and is configured to switchably connect the first filtering module and the connection port CAX to the first switching port ANT101 and the second switching port ANT 102.

Wherein the first filtering module may be the first filtering module 200 as described in the embodiments of fig. 5-8, so that the radio frequency system may be as shown in fig. 13, for example. Alternatively, when the number of the first filtering modules is multiple, the switching unit 280 may be correspondingly connected to multiple first filtering modules 200.

The first filtering module may be the first filtering module 203 described in the embodiments of fig. 9 to 12, so that the radio frequency system may be as shown in fig. 14, for example. Alternatively, when the first transmission module 201 includes the filtering unit 270, the switching unit 280 may be correspondingly connected to the filtering unit 270.

By providing the switching unit 280, the first filtering module of the first transceiver circuit 20 and the diversity receiving circuit 40 may be selectively connected to the first antenna ANT1 and the second antenna ANT2 in a switchable manner, and a target antenna may be determined from the first antenna ANT1 and the second antenna ANT2, so that the target antenna may perform transmission and main set reception, and thus, an uplink signal may be distributed on the first antenna ANT1 or the second antenna ANT2 with better antenna efficiency, and reliability of the uplink signal may be ensured to improve communication performance of the radio frequency system.

Alternatively, the switching unit 280 may be a double-pole double-throw switch, two first ends of the switching unit 280 are respectively connected to the first switching port ANT101 and the second switching port ANT102 in a one-to-one correspondence manner, and two second ends of the switching unit 280 are respectively connected to the first filtering module and the connection port CAX in a one-to-one correspondence manner. For example, please refer to fig. 15 and fig. 16 (fig. 15 and fig. 16 only show the first transceiver circuit 20, the first antenna ANT1 and the second antenna ANT2) based on the embodiment of fig. 8 and the embodiment of fig. 9, respectively.

In one embodiment, as shown in fig. 17 (fig. 17 only shows the rf transceiver 10, the second transceiver circuit 30 and the third antenna ANT3), the second transceiver circuit 30 includes:

the second transmitting module 301 is connected to the radio frequency transceiver 10, and is configured to support amplification processing on the low-frequency signal and output the amplified low-frequency signal; a second receiving module 302, connected to the radio frequency transceiver 10, for supporting MIMO reception of the main set of low frequency signals; the second filtering module 303 is connected to the second receiving module 302, the second transmitting module 301, and the third antenna ANT3, and is configured to filter spurious waves other than the low-frequency signal and separate a transceiving path of the low-frequency signal according to a signal direction of the low-frequency signal.

The second transmitting module 301 may include a power amplifier to implement an amplification processing function, and the second receiving module 302 may include a low noise amplifier to implement a low noise amplification processing on the received low frequency signal. The second filtering module 303 may perform filtering processing on the low-frequency signal received and transmitted by the second transceiver circuit 30 to filter signals other than the low-frequency signal and output only the low-frequency signal; the second filtering module 303 may further respectively perform transceiving paths of the low frequency signals according to the signal direction of the low frequency signals, so that the second transceiving circuit 30 implements transmitting and main set MIMO receiving of the low frequency signals. The second filtering module 303 may be a duplexer.

The second transmitting module 301, the second filtering module 303 and the third antenna ANT3 form a transmitting path of the second transceiver circuit 30 to implement the transmitting function of the second transceiver circuit 30, and specifically, the transmitting path performs filtering and amplifying on the low-frequency signal, so as to transmit the low-frequency signal after filtering and amplifying to the third antenna ANT 3. The second filtering module 303, the second receiving module 302 and the third antenna ANT3 form a receiving path of the second transceiver circuit 30 to implement a master MIMO receiving function of the second transceiver circuit 30, and specifically, the receiving path performs filtering and amplifying processing on a low-frequency signal received by the third antenna ANT3, and outputs the low-frequency signal after the filtering and amplifying processing to the radio frequency transceiver 10.

In one embodiment, as shown in fig. 18 (fig. 18 only shows the rf transceiver 10, the second transceiver circuit 30 and the third antenna ANT3), the second transceiver circuit 30 further includes:

and a coupling module 304, disposed on the transceiving path between the second filtering module 303 and the third antenna ANT3, for coupling the low frequency signal on the transceiving path.

The coupling module 304 includes an input terminal, an output terminal, and a coupling terminal. Specifically, the input terminal of the coupling module 304 is coupled to the second filtering module 303, the output terminal of the coupling module 304 is coupled to the third antenna ANT3, and the coupling module 304 may couple the low frequency signal on the transceiving path to generate a coupled signal, and the coupled signal is output to the radio frequency transceiver 10 through the coupled output terminal. Specifically, the coupled signal includes a forward coupled signal and a backward coupled signal, and forward power information of the low-frequency signal can be detected based on the forward coupled signal; based on the reverse coupling signal, reverse power information of the low frequency signal can be correspondingly detected. Optionally, the coupling module 304 includes a coupler.

In one embodiment, as shown in fig. 19 (fig. 19 only shows the rf transceiver 10, the second transceiver circuit 30 and the third antenna ANT3), the second receiving module 302 includes:

the input end of the first low-noise amplification unit 310 is connected to the second filtering module 303, and the output end of the first low-noise amplification unit 310 is connected to the radio frequency transceiver 10, and is configured to amplify the low-frequency signal after filtering.

The first low noise amplification unit 310 may be a low noise amplifier, and specifically, an input end of the low noise amplifier is connected to the second filtering module 303, and an output end of the low noise amplifier is connected to the radio frequency transceiver 10.

In one embodiment, as shown in fig. 19, the antenna efficiency of the first antenna ANT1 is higher than that of the third antenna ANT3, and the second receiving module 302 further includes:

an input end of the second low-noise amplification unit 320 is connected to an output end of the first low-noise amplification unit 310, and an output end of the second low-noise amplification unit 320 is connected to the radio frequency transceiver 10, and is configured to perform secondary amplification processing on the amplified low-frequency signal.

By providing the second low noise amplifier unit 320 at a position close to the third antenna ANT3 side in the second transceiver circuit 30, the reception performance of the second transceiver circuit 30 can be improved, and the problems of low efficiency and large insertion loss of first-order noise amplification due to environmental problems can be avoided. Optionally, the second low noise amplification unit 320 is a low noise amplifier, an input terminal of the low noise amplifier is connected to an output terminal of the first low noise amplification unit 310, and an output terminal of the low noise amplifier is connected to the radio frequency transceiver 10. It should be noted that the second low noise amplification unit 320 may be disposed between the first low noise amplification unit 310 and the second filtering module 303, or disposed between the radio frequency transceiver 10 and the first low noise amplification unit 310.

For convenience of explanation, as shown in fig. 20, the signal transceiving process of the second transceiving circuit 30 in this embodiment is described by taking the low frequency signal as an N28 frequency band signal as an example:

emission process of N28 low-frequency signal: the rf transceiver 10 outputs an N28 transmit signal to the second transmit module 301, amplifies the signal by the power amplifier LB PA2, filters the signal by the duplexer Du3 of the second filter module 303, and outputs the filtered signal to the third antenna ANT3 by the coupler Co 2.

Main set MIMO reception process of N28 low frequency signals: the third antenna ANT3 receives the N28 low frequency signal from the space, and the N28 low frequency signal is filtered and channel-selected by the duplexer Du3 of the second filtering module 303, amplified by the two low noise amplifiers of the second receiving module 302, and then enters the rf transceiver 10.

In one embodiment, as shown in fig. 21 (fig. 21 illustrates the diversity receiving circuit 40 connected to the second antenna ANT2, and only shows the rf transceiver 10, the diversity receiving circuit 40, the second antenna ANT2, and the fourth antenna ANT4), the diversity receiving circuit 40 includes:

the third filtering module 401 is connected to the second antenna ANT2 or the first antenna ANT1, and is configured to perform filtering processing on a low-frequency signal received by the second antenna ANT2 or the first antenna ANT 1; the input end of the first low-noise amplification module 402 is connected with the third filtering module 401, and the output end of the first low-noise amplification module 402 is connected with the radio frequency transceiver 10 and is used for amplifying the low-frequency signal after filtering; the fourth filtering module 403 is connected to the fourth antenna ANT4, and configured to perform filtering processing on the low-frequency signal received by the fourth antenna ANT 4; an input end of the second low-noise amplification module 404 is connected to the fourth filtering module, and an output end of the second low-noise amplification module 404 is connected to the radio frequency transceiver 10, and is configured to amplify the low-frequency signal after filtering.

The third filtering module 401 and the fourth filtering module 403 may both be filters, and the first low noise amplifying module 402 and the second low noise amplifying module 404 may both be low noise amplifiers. The third filtering module 401 and the first low-noise amplifying module 402 may perform filtering processing and amplifying processing on the low-frequency signal received by the second antenna ANT2 or the first antenna ANT1, and output the low-frequency signal after filtering processing and amplifying processing to the radio frequency transceiver 10, so as to implement diversity reception of the diversity receiving circuit 40; the fourth filtering module 403 and the second low-noise amplifying module 404 may perform filtering processing and amplifying processing on the low-frequency signal received by the fourth antenna ANT4, and output the low-frequency signal after the filtering processing and amplifying processing to the radio frequency transceiver 10, so as to implement diversity MIMO reception of the diversity receiving circuit 40.

In one embodiment, as shown in fig. 22 (fig. 22 shows the diversity receiving circuit 40 connected to the second antenna ANT2, and only shows the rf transceiver 10, the diversity receiving circuit 40, the second antenna ANT2 and the fourth antenna ANT4), the antenna efficiency of the second antenna is higher than that of the fourth antenna, and the diversity receiving circuit 40 further includes:

an input end of the third low-noise amplification module 405 is connected to an output end of the second low-noise amplification module 404, and an output end of the third low-noise amplification module 405 is connected to the radio frequency transceiver 10, so as to perform secondary amplification processing on the low-frequency signal amplified by the second low-noise amplification module 404.

By providing the third low noise amplification block 405 at a position close to the fourth antenna ANT4 side in the diversity reception circuit 40, it is possible to improve the reception performance of the diversity reception circuit 40 and avoid a problem of a large insertion loss due to a low efficiency caused by an environmental problem.

In one embodiment, the low-frequency signal includes a plurality of radio-frequency signals in a low-frequency band, and the number of the third filtering module 401 and the number of the fourth filtering module 403 are both multiple; the diversity reception circuit 40 is configured with a second antenna port LB ANT2 and a third antenna port LB ANT 3; the third antenna port LB ANT3 is connected to a third filtering module 401, as shown in fig. 23, and the diversity receiving circuit 40 further includes:

a first gating module 406, wherein a first end of the first gating module 406 is connected to the first low noise amplification module 402; a second gating module 407, wherein a first end of the second gating module 407 is connected to the second low noise amplification module 404; and a third gating module 408, a second terminal of the third gating module 408 being connected to a port to which the second antenna ANT2 is connected.

Each third filtering module 401 is respectively connected to the first gating module 406 and the third gating module 408, and at least one of the plurality of fourth filtering modules 403 is respectively connected to the second gating module 407 and the third gating module 408; the first gating module 406, the second gating module 407, and the third gating module 408 are configured to jointly select and conduct the rf path between the first low noise amplifying module 402 and the second antenna ANT2, and between the second low noise amplifying module 404 and the fourth antenna ANT 4. So that the diversity receiving circuit 40 can support the amplification processing of low frequency signals of a plurality of different frequency bands.

Here, the diversity receiving circuit 40 is configured with a second antenna port LB ANT2 and a third antenna port LB ANT3, and the diversity receiving circuit 40 may be understood as LFEM (Low noise amplifier front end module). By integrating the diversity receiving circuit 40, the main board area occupied by the radio frequency system can be reduced, the integration level of the device is improved, the miniaturization of the device is facilitated, and the cost is reduced; meanwhile, the insertion loss of the diversity receiving circuit 40 can be reduced, the output power of the low-frequency signal is improved, the sensitivity performance of the low-frequency signal is improved, and the communication performance of a radio frequency system can be improved.

In this embodiment, at least one of the plurality of fourth filtering modules 403 is disposed outside the LFEM module, and the other fourth filtering modules 403, the third filtering module 401, the first low noise amplifying module 402, and the second low noise amplifying module 404 are integrated inside the LFEM module. In other embodiments, all the fourth filtering modules 403 may be integrated inside the LFEM module to improve the integration level.

In one embodiment, as shown in fig. 23 (fig. 23 illustrates an example where the diversity receiving circuit 40 is connected to the second antenna ANT2), the diversity receiving circuit 40 is configured with a plurality of output ports LNA OUT, and the diversity receiving circuit 40 further includes:

two first ends of the fourth gating module 409 are respectively connected to the output ports LNA OUT of the diversity receiving circuit 40 in a one-to-one correspondence manner, and two second ends of the fourth gating module 409 are respectively connected to the first low-noise amplifying module 402 and the second low-noise amplifying module 404 in a one-to-one correspondence manner. The fourth gating module 409 can selectively turn on the rf path between the output port LNA OUT of the diversity receiving circuit 40 and the first and second low

noise amplifying modules

402 and 404.

In one embodiment, as shown in fig. 24 (fig. 24 illustrates that the diversity receiving circuit 40 is connected to the second antenna ANT2), the first gating module 406, the second gating module 407, the third gating module 408, and the fourth gating module 409 correspond to the multi-channel selection switch SP4T6, the multi-channel selection switch SP4T7, the multi-channel selection switch SP8T3, and the double-pole double-throw switch DPDT3, respectively. The third filtering module 401 and the fourth filtering module 403 are filters, respectively, and the first low noise amplifying module 402 and the second low noise amplifying module 404 are a low noise amplifier LNA7 and a low noise amplifier LNA8, respectively.

For convenience of explanation, the signal receiving process of the diversity receiving circuit 40 in this embodiment is described by taking the low frequency signal as an N28 frequency band signal as an example:

diversity reception process of N28 low frequency signal: the second antenna ANT2 (for example, the diversity receiving circuit 40 is connected to the second antenna ANT2) receives the N28 low frequency signal from the space, and the N28 low frequency signal is filtered by the filter F3, amplified by the low noise amplifier LNA8, and then output to the rf transceiver 10.

Diversity MIMO reception procedure of N28 low frequency signals: the fourth antenna ANT4 receives the N28 low frequency signal from the space, and the N28 low frequency signal is filtered by the filter F6, amplified by the low noise amplifier LNA9 and output to the rf transceiver 10.

In one embodiment, as shown in fig. 24, the diversity receiving circuit 40 is further configured with a medium-high frequency antenna port MHB ANT, and the diversity receiving circuit 40 is further configured to connect to a sixth antenna to support reception of medium-frequency signals and high-frequency signals, and to perform filtering and amplification processing on the medium-high frequency radio-frequency signals. Optionally, the diversity receiving circuit 40 further includes a fifth gating module 410, a fourth low noise amplification module 411, a sixth gating module 412, a fifth filtering module 413, and a seventh gating module 414. Specifically, the fifth gating module 410 may include a plurality of multi-channel selection switches SP4T, the fourth low noise amplification module 411 includes a plurality of low noise amplifiers LNA1, the sixth gating module 412 includes a plurality of multi-channel selection switches SP4T, the fifth filtering module 413 includes a plurality of filters, and the seventh gating module 414 includes a multi-channel selection switch SP8T 4.

The embodiment of the application also provides communication equipment, and the communication equipment is provided with the radio frequency system in any embodiment. Alternatively, the specific structure of the radio frequency system may be as shown in fig. 25 and 26.

By arranging the radio frequency system on the communication equipment, double-path transmission and 4 x 4MIMO (multiple input multiple output) receiving can be realized, and the throughput of low-frequency signals can be improved in multiples under the condition of not increasing frequency spectrum resources and antenna transmission power; the downloading rate can be improved to improve the experience of users, and meanwhile, when the communication equipment is positioned at the edge of a cell, deep in a building, in an elevator and other weak signal environments, the communication equipment is received through 4 x 4MIMO, so that higher diversity gain and larger coverage distance are achieved; the device has high integration level, the area of the substrate occupied by each device in the radio frequency system is reduced, meanwhile, the layout and wiring can be simplified, and the cost is saved.

As shown in fig. 27, further taking the communication device as a mobile phone 11 for illustration, specifically, as shown in fig. 27, the mobile phone 11 may include a memory 21 (which optionally includes one or more computer-readable storage media), a processor 22, a peripheral interface 23, a radio frequency system 24, and an input/output (I/O) subsystem 26. These components optionally communicate via one or more communication buses or signal lines 29. Those skilled in the art will appreciate that the handset 11 shown in fig. 27 is not intended to be limiting and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. The various components shown in fig. 27 are implemented in hardware, software, or a combination of both hardware and software, including one or more signal processing and/or application specific integrated circuits.

The memory 21 optionally includes high-speed random access memory, and also optionally includes non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid-state memory devices. Illustratively, the software components stored in memory 21 include an operating system 211, a communications module (or set of instructions) 212, a Global Positioning System (GPS) module (or set of instructions) 213, and the like.

The processor 22 and other control circuitry, such as control circuitry in the radio frequency system 24, may be used to control the operation of the handset 11. The processor 22 may be based on one or more microprocessors, microcontrollers, digital signal processors, baseband processors, power management units, audio codec chips, application specific integrated circuits, and the like.

The processor 22 may be configured to implement a control algorithm that controls the use of the antenna in the handset 11. The processor 22 may also issue control commands for controlling various switches in the radio frequency system 24, and the like.

The I/O subsystem 26 couples input/output peripheral devices on the cell phone 11, such as a keypad and other input control devices, to the peripheral device interface 23. The I/O subsystem 26 optionally includes a touch screen, buttons, tone generators, accelerometers (motion sensors), ambient and other sensors, light emitting diodes and other status indicators, data ports, and the like. Illustratively, a user may control the operation of the handset 11 by supplying commands through the I/O subsystem 26, and may receive status information and other output from the handset 11 using the output resources of the I/O subsystem 26. For example, a user pressing button 261 may turn the phone on or off.

The rf system 24 may be any of the rf systems described in any of the preceding embodiments.

In the description herein, reference to the description of "one of the embodiments," "optionally," or the like means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A radio frequency system, comprising:

a radio frequency transceiver;

2. The radio frequency system of claim 1, further comprising:

and a switching circuit, connected to the first transceiver circuit, the diversity receiving circuit, the first antenna, and the second antenna, respectively, for switchably connecting the first transceiver circuit and the diversity receiving circuit to the first antenna and the second antenna.

3. The RF system according to claim 1, wherein the antenna efficiency of the first antenna and the second antenna is higher than the efficiency of the third antenna and the fourth antenna, and wherein the RF transceiver is configured to configure a default target antenna connected to the first transceiver circuit for main set reception according to the network information of the low frequency signals received by the first transceiver circuit and the diversity reception circuit, and the default target antenna is one of the first antenna and the second antenna.

4. The radio frequency system according to claim 3, wherein the first antenna is configured as a default target antenna for transmission and main set reception of the low frequency signal, and the second antenna is configured as the default target antenna if a difference between a second signal strength of the low frequency signal received by the second antenna and a first signal strength of the low frequency signal received by the first antenna is greater than or equal to a preset threshold value within a preset time period.

5. The radio frequency system according to claim 1, wherein the first transceiver circuit comprises:

the first transmitting module is configured with a first antenna port, and comprises a transmitting unit, wherein the input end of the transmitting unit is connected with the radio frequency transceiver, and the transmitting unit is used for amplifying the received low-frequency signal and outputting the amplified low-frequency signal;

the first receiving module is connected with the radio frequency transceiver and is used for supporting the main set receiving of the low-frequency signals;

the first filtering module is connected with the output end of the transmitting unit, the first antenna port and the first receiving module respectively, and the first filtering module is connected with the first antenna or the second antenna through the first antenna port and used for filtering stray waves except the low-frequency signals and separating the receiving and transmitting paths of the low-frequency signals according to the signal direction of the low-frequency signals.

6. The RF system of claim 5, wherein the first antenna port comprises a first switch port and a second switch port, the first switch port and the second switch port are configured to connect the first antenna and the second antenna in a one-to-one correspondence, respectively, and the first transmitting module is further configured with a connection port configured to connect the diversity receiving circuit; the first transmitting module further comprises:

and the switching unit is respectively connected with the first filtering module, the first switching port, the second switching port and the connecting port, and is used for switchably connecting the first filtering module and the connecting port with the first switching port and the second switching port.

7. The radio frequency system of claim 5, wherein the first transmit module is further configured with an output port configured to connect to the first receive module; wherein:

the first filtering module is respectively connected with the output end of the transmitting unit, the first antenna port and the output port, and the first filtering module is connected with the first receiving module through the output port.

8. The radio frequency system according to claim 7, wherein the low frequency signal comprises a plurality of low frequency band radio frequency signals; the number of the first filtering modules and the number of the output ports are both multiple; the first transmitting module further comprises:

a first gating unit, wherein a first end of the first gating unit is connected with the transmitting unit;

a second gating unit, a first end of the second gating unit being connected to the first antenna port;

the two first ends of each first filtering module are respectively connected with a second end of the first gating unit and the output port in a one-to-one correspondence manner, the second ends of the plurality of first filtering modules are connected with the second ends of the second gating unit in a one-to-one correspondence manner, and the frequency bands of the low-frequency signals output by each first filtering module are different.

9. The RF system according to claim 5, wherein the first transmitting module is further configured with an auxiliary transmitting port, an auxiliary transceiving port, the auxiliary transmitting port being connected to the output of the transmitting unit, the auxiliary transceiving port being connected to the first antenna port; wherein:

the two first ends of the first filtering module are respectively connected with the auxiliary transmitting port and the first receiving module in a one-to-one correspondence manner, and the second end of the first filtering module is connected with the auxiliary receiving and transmitting port.

10. The radio frequency system according to claim 9, wherein the low frequency signal comprises a plurality of low frequency band radio frequency signals; the first transmit module is further configured with an output port configured for connecting the first receive module, the first transmit module further comprising:

a first gating unit, wherein a first end of the first gating unit is connected with the output end of the transmitting unit, and a second end of the first gating unit is connected with the auxiliary transmitting port;

a second gating unit, a first end of which is connected to the first antenna port and a second end of which is connected to the auxiliary transceiving port;

the filtering unit, two first ends of the filtering unit are respectively connected with a second end of the first gating unit and the output port in a one-to-one correspondence manner, the second end of the filtering unit is connected with a second end of the second gating unit and used for filtering stray waves except the low-frequency signals and separating the receiving and transmitting paths of the low-frequency signals according to the signal direction of the low-frequency signals, and the frequency band of the low-frequency signals filtered by the filtering unit is different from the frequency band of the low-frequency signals filtered by the first filtering module.

11. The radio frequency system according to any of claims 1 to 10, wherein the second transceiver circuit comprises:

the second transmitting module is connected with the radio frequency transceiver and used for supporting amplification processing of the low-frequency signal and outputting the amplified low-frequency signal;

the second receiving module is connected with the radio frequency transceiver and is used for supporting main set MIMO (multiple input multiple output) receiving of the low-frequency signals;

and the second filtering module is respectively connected with the second receiving module, the second transmitting module and the third antenna and is used for filtering stray waves except the low-frequency signals and separating the receiving and transmitting paths of the low-frequency signals according to the signal direction of the low-frequency signals.

12. The radio frequency system of claim 11, wherein the second transceiver circuit further comprises:

and the coupling module is arranged on a transceiving path between the second filtering module and the third antenna and is used for coupling the low-frequency signal on the transceiving path.

13. The radio frequency system according to claim 11, wherein the second receiving module comprises:

the input end of the first low-noise amplification unit is connected with the second filtering module, and the output end of the first low-noise amplification unit is connected with the radio frequency transceiver and used for amplifying the low-frequency signals after filtering.

14. The rf system of claim 13, wherein the first antenna has an antenna efficiency higher than an antenna efficiency of the third antenna, and wherein the second receiving module further comprises:

and the input end of the second low-noise amplification unit is connected with the output end of the first low-noise amplification unit, and the output end of the second low-noise amplification unit is connected with the radio frequency transceiver and is used for carrying out secondary amplification processing on the amplified low-frequency signal.

15. The radio frequency system according to any of claims 1 to 10, wherein the diversity reception circuit comprises:

the third filtering module is connected with the second antenna or the first antenna and used for filtering the low-frequency signal received by the second antenna or the first antenna;

the input end of the first low-noise amplification module is connected with the third filtering module, and the output end of the first low-noise amplification module is connected with the radio frequency transceiver and is used for amplifying the low-frequency signal after filtering;

the fourth filtering module is connected with the fourth antenna and used for filtering the low-frequency signal received by the fourth antenna;

and the input end of the second low-noise amplification module is connected with the fourth filtering module, and the output end of the second low-noise amplification module is connected with the radio frequency transceiver and is used for amplifying the low-frequency signals after filtering.

16. The rf system of claim 15, wherein the antenna efficiency of the first antenna and the second antenna is higher than the antenna efficiency of the fourth antenna, the diversity reception circuit further comprising:

and the input end of the third low-noise amplification module is connected with the output end of the second low-noise amplification module, and the output end of the third low-noise amplification module is connected with the radio frequency transceiver and is used for carrying out secondary amplification processing on the low-frequency signal amplified by the second low-noise amplification module.

17. The radio frequency system of claim 1, wherein the low frequency signal comprises at least one of N5, N8, N20, N28, N71 frequency bands.

18. A communication device comprising a radio frequency system according to any of claims 1-17.