CN113949402A

CN113949402A - Radio frequency system and communication equipment

Info

Publication number: CN113949402A
Application number: CN202111449168.7A
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: 2022-01-18
Anticipated expiration: 2041-11-30
Also published as: CN113949402B

Abstract

The application relates to a radio frequency system and a communication device. The radio frequency system includes: a radio frequency transceiver; a transceiving circuit configured with a first transceiving path for supporting transmission and reception of a low frequency signal and a second transceiving path for supporting transmission and reception of a low frequency signal; a reception circuit configured with a first reception path and a second reception path for supporting reception processing of a low-frequency signal, respectively; the first transceiving path and the first receiving path are respectively configured to switchably connect the first antenna and the third antenna, the second transceiving path is configured to connect the second antenna, and the second receiving path is configured to connect the fourth antenna. The radio frequency system provided by this embodiment can implement an uplink 2 × 2MIMO function and a downlink 4 × 4MIMO receiving function for low frequency signals, and can also enable the first transceiving path and the first receiving path to be switched between two antennas, thereby improving the flexibility and communication performance of the radio frequency system.

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 and transmitting performance for 5G low-frequency signals (e.g., N28 frequency band signals) in poor signal areas such as cell edges, deep building depths or elevators.

Disclosure of Invention

The embodiment of the application provides a radio frequency system and communication equipment, can realize 4 x 4MIMO to low frequency signal and to the double-circuit transmission of low frequency signal, have better receipt and transmission performance.

A radio frequency system, comprising:

a radio frequency transceiver;

a transceiver circuit connected with the radio frequency transceiver and configured with a first transceiver path and a second transceiver path, wherein the first transceiver path is used for supporting the transmission and the reception of low-frequency signals, and the second transceiver path is used for supporting the transmission and the reception of the low-frequency signals;

the receiving circuit is connected with the radio frequency transceiver and is configured with a first receiving path and a second receiving path, wherein the first receiving path and the second receiving path are respectively used for supporting the receiving processing of the low-frequency signals; the first transceiving path and the first receiving path are respectively configured to switchably connect a first antenna and a third antenna, the second transceiving path is configured to connect a second antenna, and the second receiving path is configured to connect a fourth antenna.

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

The radio frequency system comprises a radio frequency transceiver, a transceiver circuit and a receiving circuit, wherein the transceiver circuit is provided with two transceiver paths capable of supporting receiving and transmitting low-frequency signals, and the receiving circuit is provided with two receiving paths capable of supporting receiving and processing low-frequency signals, so that the transmit diversity, the uplink 2 x 2MIMO function and the downlink 4 x 4MIMO receiving function of the low-frequency signals can be realized. If the radio frequency system provided in this embodiment is in an environment with good signals, compared with a radio frequency system that can only support low-frequency signal 2 × 2MIMO reception and single-channel transmission in the related art, the downlink communication rate can be doubled, the uplink rate can be doubled, and the uplink coverage distance can be doubled, so that the channel capacity and the reception and transmission performance of the radio frequency system can be doubled, and meanwhile, the first transceiving path and the first receiving path can be switched between two antennas, so that the radio frequency system can implement antenna switching according to the current environment, and the flexibility and the communication performance of the radio frequency system can be improved.

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 second schematic diagram of an embodiment of an RF system;

FIG. 3 is a third exemplary diagram of an RF system;

FIG. 4 is a fourth schematic diagram of an embodiment of an RF system;

fig. 5 is a schematic diagram of the distribution of four antennas in a communication device according to an embodiment;

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

FIG. 7 is a sixth schematic diagram illustrating the structure of a receiver circuit according to an embodiment;

FIG. 8 is a seventh schematic diagram illustrating an exemplary RF system;

FIG. 9 is an eighth schematic block diagram of an exemplary RF system;

FIG. 10 is a diagram illustrating an exemplary transceiver circuit;

fig. 11 is a schematic diagram of a specific structure of a transceiver circuit in another embodiment;

FIG. 12 is a ninth illustration of a schematic block diagram of an exemplary RF system;

FIG. 13 is a diagram showing a schematic structure of an RF system according to an embodiment;

FIG. 14 is a schematic diagram of the structure of a receiving circuit in one embodiment;

FIG. 15 is an eleventh illustration of a schematic structural diagram of a radio frequency system in one embodiment;

FIG. 16 is a twelfth schematic block diagram of an exemplary RF system;

fig. 17 is a schematic structural diagram of a communication device 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 and fig. 2, in one embodiment, a radio frequency system provided in the embodiment of the present application includes: a radio frequency transceiver 100, a transceiving circuit 200, a receiving circuit 300, a first antenna ANT1, a second antenna ANT2, a third antenna ANT3, and a fourth antenna ANT 4.

In the present embodiment, the first antenna ANT1, the second antenna ANT2, the third antenna ANT3, and the fourth antenna ANT4 are capable of supporting reception and transmission of low frequency signals of a plurality of different frequency bands. 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 of a low frequency band, or may include radio frequency signals of 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.

The rf transceiver 100 may be configured with a plurality of ports capable of being connected to the transceiver circuit 200 and the receiving circuit 300, respectively. Therein, the transceiving circuit 200 is configured with a first transceiving path and a second transceiving path. The first transceiving path is configured to switchably connect the first and third antennas ANT2 for supporting transmission and reception of low frequency signals. The second transceiving path is configured to connect to a second antenna for supporting transmission and reception of low frequency signals. The two transmit paths configured in the transceiver circuit 200 may cooperate with the two antennas to jointly support dual-path reception of the low-frequency signals, so as to support a downlink 2 x 2MIMO function on the low-frequency signals, and to jointly support dual-path transmit processing on the low-frequency signals, so as to support transmit diversity and an uplink 2 x 2MIMO function on the low-frequency signals.

A receiving circuit 300 configured with a first receiving path RX3 configured to switchably connect a first antenna and a third antenna ANT2 and a second receiving path RX4 configured to connect a fourth antenna. The first receiving path RX3 and the second receiving path RX4 are respectively used for supporting the receiving process of the low-frequency signal.

The first transceiving path and the second transceiving path configured in the transceiving circuit 200 and the first receiving path RX3 and the second receiving path RX4 in the receiving circuit 300 may be respectively and correspondingly connected to a unique antenna, and each (sub) receiving path may respectively perform receiving processing on a low-frequency signal received by the antenna, and correspondingly transmit the processed low-frequency signal to a port corresponding to the radio frequency transceiver 100. For example, the transceiver receive path may amplify the received low frequency signal and transmit the processed low frequency signal to the rf transceiver 100. The first receiving path RX3, the second receiving path RX4, the first transceiving path and the second transceiving path may cooperate with four antennas, so as to implement receiving processing of four low-frequency signals, and further support a 4 × 4MIMO receiving function of the low-frequency signals. For example, if the low frequency signal is an N28 band signal, the rf system may support transmit diversity and uplink 2 × 2MIMO function and downlink 4 × 4MIMO receiving function for the N28 band signal. If the low frequency signals include signals of N5, N8, N20, N28 and N71 frequency bands, the rf system can support transmit diversity of signals of N5, N8, N20, N28 and N71 frequency bands, uplink 2 × 2MIMO function and downlink 4 × 4MIMO receiving function.

In the embodiment of the present application, the radio frequency system includes a radio frequency transceiver 100, a transceiver circuit 200, and a receiver circuit 300, where the transceiver circuit 200 is configured with two transceiver paths capable of supporting receiving and transmitting low frequency signals, and the receiver circuit 300 is configured with two receiver paths capable of supporting receiving and processing low frequency signals, so as to implement transmit diversity, an uplink 2 × 2MIMO function, and a downlink 4 × 4MIMO receiving function for low frequency signals. If the rf system provided in this embodiment is in an environment with good signals, compared to an rf system in the related art that can only support low-frequency signal 2 × 2MIMO reception and single-channel transmission, the downlink communication rate can be doubled, the uplink communication rate can be doubled, and the uplink coverage distance can be doubled. If the radio frequency system provided by this embodiment is located at the edge of a cell, deep in a building, in a weak signal environment such as an elevator, compared with a radio frequency system capable of only supporting low-frequency signal 2 x 2MIMO reception and single-path transmission in the related art, diversity reception gain can be doubled, the downlink coverage distance is also doubled, and simultaneously, the uplink rate can be doubled, and the uplink coverage distance is also doubled. The radio frequency system provided by the embodiment of the application can improve the channel capacity and the receiving and transmitting performance of the radio frequency system by times, can also enable the first receiving and transmitting channel and the first receiving channel to be switched between the two antennas, can enable the radio frequency system to realize antenna switching according to the current environment, and can improve the flexibility and the communication performance of the radio frequency system.

As shown in fig. 3, in one embodiment, the radio frequency system further includes: a switch module 400. Two first ends of the switch module 400 are respectively configured to be connected to the first transceiving path and the first receiving path in a one-to-one correspondence manner, and two second ends of the switch module 400 are respectively connected to the first antenna ANT1 and the third antenna ANT2 in a one-to-one correspondence manner. It is understood that the first transceiving path and the first receiving path may switchably connect the first antenna ANT0 and the third antenna ANT2 through the switch module 400. In one embodiment, the switch module 400 may comprise a double pole double throw switch.

In one embodiment, the antenna efficiency of each of the first antenna ANT0 and the third antenna ANT2 is higher than that of each of the second antenna and the fourth antenna. Generally, when the radio frequency system is applied to a communication device, due to the limitation of the structure of the communication device, as shown in fig. 4, the first antenna ANT0 and the third antenna ANT2 are usually disposed on the top frame 101 and the bottom frame 103 of the communication device, respectively, and the second antenna ANT1 and the fourth antenna ANT3 are disposed on the two

side frames

102, 104 of the communication device, so that the efficiency of the first antenna ANT0 and the efficiency of the third antenna ANT2 are higher than the efficiency of the second antenna ANT1 and the efficiency of the fourth antenna ANT 3. In the embodiment of the present application, the first transceiving path and the first receiving path are configured to switchably connect the first antenna ANT0 and the third antenna ANT 2. It is understood that the first transceiving path may be connected to the first antenna ANT0 and the first receiving path may be connected to the third antenna ANT2 by on-off controlling the switch module 400. Alternatively, the first receiving path is connected to the third antenna ANT2, and the first transmitting/receiving path is connected to the first antenna ANT 0. In the embodiment of the present application, the first antenna ANT0 and the third antenna ANT2 may both support transmission, primary set reception, and diversity reception of low-frequency signals.

In this embodiment, the antenna efficiencies of the first antenna ANT0 and the third antenna ANT2 are higher than the efficiencies of the second antenna ANT1 and the fourth antenna ANT3, where the target antenna is any one of the first antenna ANT0 and the third antenna ANT2, and the uplink signal may be distributed on the first antenna ANT0 or the third antenna ANT2 with better antenna efficiency, so as to ensure the reliability of the uplink signal and improve the communication performance of the radio frequency system. Further, by providing the switch module 400, selectively conducting the paths between the first transceiving path and the first antenna ANT0 and the third antenna ANT2, respectively, and the paths between the first receiving path and the first antenna ANT0 and the third antenna ANT2, determining the target antenna from the first antenna ANT0 and the third antenna ANT2 in cooperation with the radio frequency transceiver 100, and controlling the switch module 400 so that the target antenna can be connected to the first transceiving path, the uplink signal can be distributed on the first antenna ANT0 or the third 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.

With continued reference to fig. 1-3, in one embodiment, the first transceiving path may include a first transmitting path TX1 and a first sub-receiving path RX1, and the second transceiving path may include a second transmitting path TX2 and a second sub-receiving path RX 2. Wherein, the first transmission path TX1 and the second transmission path TX2 may be respectively configured to support transmission processing of low frequency signals, and the first sub-reception path RX1 and the second sub-reception path RX2 may be respectively configured to support reception processing of low frequency signals.

As shown in fig. 5, the transceiver circuit 200 includes a transceiver module 210 and a transmitter module 220. Wherein the transceiver module 210 is configured with a first transmit path TX1, a first sub-receive path RX1 and a second sub-receive path RX 2. Wherein the first transmit path TX1, the first sub-receive path RX1 are configured to be connected to the same antenna, and the first antenna ANT0 and the third antenna ANT2 are switchably connected by the switch module 400. The first transmit path TX1 may be used for power amplification and filtering processing of a low frequency signal to implement transmission of the low frequency signal, and the first sub-receive path RX1 may be used for supporting filtering and low noise amplification processing of the low frequency signal to implement reception of the low frequency signal. The second sub receiving path RX2 is configured to be connected to the second antenna ANT1, and the second sub receiving path RX2 may be configured to support low-noise amplification processing on a low-frequency signal to implement reception of the low-frequency signal.

A transmitting module 220 respectively connected to the rf transceiver 100, the transceiver module 210, and the second antenna ANT1, wherein the transmitting module 220 is configured with a second transmitting path TX2 for supporting a transmitting process of the low frequency signal. The second transmit path TX2 may be used for power amplification and filtering processing of the low frequency signal to achieve transmit processing of the low frequency signal. In the embodiment of the present application, the second sub-receiving path RX2 may be configured to be connected to the second transmitting path TX2, that is, the second sub-receiving path RX2 may receive the low-frequency signal after the filtering processing, and perform a low-noise amplification process on the low-frequency signal after the filtering processing, so as to implement a main set MIMO reception on the low-frequency signal.

In one embodiment, the switch module 400 may include a double-pole double-throw switch, wherein two first ends of the switch module 400 are respectively connected to the first transceiving paths of the transceiving module 210 and the receiving circuit 300 in a one-to-one correspondence manner, and two second ends of the switch module 400 are respectively connected to the first antenna ANT0 and the third antenna ANT 2.

In particular, the radio frequency transceiver 100 is configured with a plurality of ports, which may include, for example, a plurality of output ports and a plurality of input ports. Each input port is configured to receive a low-frequency signal input from the antenna side, and each output port is configured to output a low-frequency signal processed by the radio frequency transceiver 100 to the antenna side. Wherein each output port is configured to be connected to a respective transmit path and each input port is configured to be connected to a respective receive path. The radio frequency transceiver 100 is configured to configure a target antenna connected to the first transceiving path according to the network information of the low frequency signal received by the first sub receiving path RX1 and the first receiving path RX3, where the target antenna is one of the first antenna ANT0 and the third 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 Indicator (RSSI), Signal to Noise Ratio (SNR), Rank of MIMO channel matrix (Rank), Carrier to Interference Noise Ratio (RS-CINR), frame error rate, bit error rate, Reference Signal Reception Quality (RSRQ), and the like.

For convenience of explanation, the network information is taken as an example of the received signal strength indication. The radio frequency transceiver 100 may configure the target antenna according to the received signal strength indication magnitude of the low frequency signal received by the first sub reception path RX1 and the first reception path RX 3. If the received signal strength indication of the current first sub-receiving path RX1 is less than or equal to the received signal strength indication of the first receiving path RX3, the antenna currently connected to the first receiving path RX3 is taken as the target antenna, and the switch module 400 is controlled to connect the target antenna to the first receiving path RX 3.

In one embodiment, the first antenna ANT0 is configured as a default target antenna for the low frequency signal, and the radio frequency transceiver is configured to configure the third antenna ANT2 as the target antenna if a difference between a first signal strength of the low frequency signal received through the first sub receiving path RX1 and a second signal strength of the low frequency signal received through the first receiving path RX3 is less than or equal to a preset threshold value within a preset time period.

Specifically, the radio frequency transceiver 100 stores configuration information of the first sub-receiving path RX1, the second sub-receiving path RX2, the first receiving path RX3, and the second receiving path RX 4. The configuration information may include identification information of ports of the radio frequency transceiver 100, identification information of each antenna, control logic information of each switch on the first sub-reception path RX1, the second sub-reception path RX2, the first reception path RX3, the second reception path RX4, and the like. The default target antenna of the radio frequency system and the like may be stored in the radio frequency transceiver 100 in advance. In the embodiment of the present application, the default target antenna may be understood as a priority antenna or an optimal antenna for signal transmission of the radio frequency system in the initial state, and the default antenna is configured to be connected to the first transceiving path. That is, the default target antenna is used to enable transmission and dominant set reception of low frequency signals. It is understood that the configuration information may be stored in a memory device separate from the rf transceiver 100, and may be read by the rf transceiver 100 when necessary. The above configuration information may also be stored in the radio frequency transceiver 100. In the embodiment of the present application, the storage location of the configuration information is not further limited.

The rf transceiver 100 is configured to configure the target antenna according to the received signal strength indication of the rf signal received by the first sub-receiving path RX1 and the first receiving path RX 3. After determining the target antenna, the rf transceiver 100 may control the switch module 400 to turn on the path between the target antenna and the first sub-reception path RX 1.

In a default operating state of the radio frequency system, the first transceiving path is configured to be connected to the first antenna ANT0, the first receiving path RX3 is connected to the third antenna ANT2, the second sub-receiving path is connected to the second antenna ANT1, and the second receiving path is connected to the fourth antenna ANT 3. In the default operating state, the rf transceiver 100 obtains a first rssi of the low frequency signal received by the first sub-receiving path RX1 and a second rssi of the low frequency signal received by the first receiving path RX3, and if a difference between the second rssi and the first rssi is greater than or equal to a predetermined threshold within a predetermined time, the third antenna ANT2 is used as the target antenna. After determining the target antenna, the rf transceiver 100 may control the switch module 400 to open a path between the target antenna (the third antenna ANT2) and the first sub receiving path RX1 and open a path between the first antenna ANT0 and the first receiving path RX 3. As such, it may be considered that the first antenna ANT0 may be shielded (e.g., held by a user), and the transmission and the main set reception of the low frequency signal may be switched to the third antenna ANT2, so that the transmission and the main set reception of the low frequency signal are implemented by using the third antenna ANT2 to improve the communication quality of the low frequency signal. If the difference is smaller than the preset threshold, the first antenna ANT0 is continuously used as the target antenna, and the current working state is maintained. It should be noted that, in the embodiment of the present application, the preset threshold is all larger than a zero value, and the size of the preset threshold may be set as needed.

In the embodiment of the application, by setting the judgment condition of the preset threshold, frequent switching between the antennas caused by the fact that the signal strength of the antennas may be constantly changing can be prevented, and further, the influence of the transmission efficiency of the antennas can be reduced.

As shown in fig. 6, in one embodiment, the transceiver module 210 includes a transceiver unit 211 and a first filter unit 212. The transceiving unit 211 is configured to support amplification processing, such as power amplification and low noise amplification processing, on the received low frequency signal. For example, the transceiver 211 may be a Power Amplifier module (Mid) with a built-in low noise Amplifier, which may be referred to as an L-Mid device for short. The first filtering unit 212 is configured to filter the received low-frequency signal, filter stray 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.

Specifically, the transceiver unit 211 is configured with a first input port IN, a first output port OUT1, a second output port OUT2 for connection with a radio frequency transceiver, a first antenna port LB _ ANT1 connected with the switch module 400, and a first auxiliary input port AUX connected with the transmit module. Wherein the first antenna port LB _ ANT1 is switchably connected to the first antenna ANT0 and the third antenna ANT2 via the switch module 400. In the present embodiment, the first filtering unit 212 is integrated in the transceiving unit 211. Specifically, the transceiver 211 includes a first transmit amplifier 2111, a first receive amplifier 2112 and a second receive amplifier 2113.

The first transmit path may include a first input port IN, a first transmit amplifier 2111, a first filter 212, and a first antenna port LB _ ANT 1. And the transmission processing of the low-frequency signal can be realized based on the first transmission path. Specifically, the first transmit amplifier unit 2111 performs power amplification on the low-frequency signal received by the first input port IN, transmits the amplified low-frequency signal to the first filter unit 212 for filtering, and transmits the filtered low-frequency signal to the first antenna port LB _ ANT1, so as to implement transmit processing on the low-frequency signal. The first sub-receiving path may be composed of the first antenna port OUT1, the first filtering unit 212, the first receiving amplifying unit 2112, and the first output port OUT 1. Specifically, the first antenna port LB _ ANT1 outputs the received low-frequency signal to the first filtering unit 212 for filtering, the filtered low-frequency signal is transmitted to the first receiving and amplifying unit 2112 for low-noise amplification, and the low-frequency signal after the low-noise amplification is transmitted to the first output port OUT1, so as to implement receiving of the low-frequency signal. The second sub-receiving path may be constituted by the first auxiliary input port _ AUX, the second receiving amplifying unit 2113, and the second output port OUT 2. The receiving processing of the low-frequency signal can be realized based on the second sub-receiving path, specifically, the first auxiliary input port _ AUX outputs the low-frequency signal after the filtering processing to the second receiving and amplifying unit 2113 for low-noise amplification processing, and outputs the low-frequency signal after the low-noise amplification processing to the second output port OUT2, so as to realize the receiving processing of the low-frequency signal.

An input end of the first transmit amplifier unit 2111 is connected to the first input port IN, and an output end of the first transmit amplifier unit 2111 is connected to the first antenna port LB _ ANT1 through the first filter unit 212. An input terminal of the first receiving amplifying unit 2112 is connected to the first antenna port LB _ ANT1 through the first filtering unit 212, and an output terminal of the first receiving amplifying unit 2112 is connected to the first output port OUT 1. An input terminal of the second receiving amplifying unit 2113 is connected to the first auxiliary input port _ AUX, and an output terminal of the second receiving unit is connected to the second output port OUT 2.

As shown in fig. 7, in one embodiment, the transceiver module 210 includes a transceiver unit 211 and a first filtering unit 212, wherein the transceiver module 210 is configured with a first auxiliary port, a second auxiliary port, and a third auxiliary port in addition to the respective ports in the foregoing embodiments. In this embodiment, the first filtering unit 212 is externally disposed in the transceiving unit 211. Specifically, an input end of the first transmission amplifying unit 2111 is connected to the first input port IN, and an output end of the first transmission amplifying unit 2111 is connected to the first auxiliary port. An input terminal of the first receiving amplifying unit 2112 is connected to the second auxiliary port, and an output terminal of the first receiving amplifying unit 2112 is connected to the first output port OUT 1. An input end of the second receiving amplifying unit 2113 is connected to the first auxiliary input port _ AUX, and an output end of the second receiving amplifying unit 2113 is connected to the second output port OUT 2. Two first ends of the first filtering unit 212 are respectively connected with the first auxiliary port and the second auxiliary port in a one-to-one correspondence manner, and a common end of the first filtering unit 212 is connected with the switch module 400 through the third auxiliary port, and is configured to filter stray 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.

In the embodiment of the present application, the transceiver module 210 can support a transmission process and a reception process for the radio frequency signals of at least one low frequency band. The frequency band of the low-frequency signal may include at least one of N5, N8, N20, N28, and N71 frequency bands.

With continuing reference to fig. 6 and 7, in one embodiment, the transmitting module includes a second transmitting amplifying unit 221 and a second filtering unit 222. The input end of the second transmitting and amplifying unit 221 is connected to the radio frequency transceiver, and is configured to perform power amplification processing on the received low-frequency signal. The second filtering unit 222 is connected to the output end of the second transmitting and amplifying unit 221, the transceiving module 210, and the second antenna, and is configured to filter the received low-frequency signal and separate a transceiving path of the low-frequency signal according to a signal direction of the low-frequency signal. The transmitting module can support the transmitting processing of the radio frequency signals of at least one low frequency band. The frequency band of the low-frequency signal may include at least one of N5, N8, N20, N28, and N71 frequency bands.

With continued reference to fig. 6 and 7, IN one embodiment, the receiving circuit 300 is configured with a second antenna port LB _ ANT2 for connection with the third antenna ANT2 and a second auxiliary input port LAN IN AUX for connection with the fourth antenna ANT 3. The receiving circuit 300 includes a first receiving module 310 and a second receiving module 320. Specifically, the first receiving module 310 is configured with the first receiving path connected to the rf transceiver 100 and the second antenna port LB _ ANT2, respectively. The first receiving path is configured to filter and amplify a low-frequency signal transmitted through the second antenna port LB _ ANT2, and transmit the low-frequency signal to the radio frequency transceiver 100, so as to implement a receiving process of the low-frequency signal. Wherein the second antenna port LB _ ANT2 switchably connects the first antenna ANT0 and the third antenna ANT2 through the switching module 400. The second receiving module 320 is configured with the second receiving path connected with the second auxiliary input port LAN IN AUX, the radio frequency transceiver 100, respectively. The second receiving path is configured to perform low-noise amplification processing on the low-frequency signal transmitted through the second auxiliary input port LAN IN AUX and transmit the low-frequency signal to the radio frequency transceiver 100, so as to support receiving processing of the low-frequency signal. Wherein the receiving circuit is capable of supporting two-way reception processing of radio frequency signals of at least one low frequency band. The frequency band of the low-frequency signal may include at least one of N5, N8, N20, N28, and N71 frequency bands.

The receiving circuit 300 provided in this embodiment may implement receiving processing on two low-frequency signals by providing the first receiving module 310 and the second receiving module 320. In the embodiment of the present application, each module included in the receiving circuit 300 may be integrated into the same receiving device, and the receiving device may be a radio frequency Low noise amplifier module (LFEM), which is referred to as LFEM device for short. The LFEM device, which may specifically include a low noise amplifier and at least one filter, etc., may be used to support receive processing of low frequency signals (e.g., 4G LTE signals and 5G NR signals including at least one low frequency band). It is understood that the receiving circuit 300 may be the LFEM device, and by providing the LFEM device, the integration level of the rf system may be increased, the occupied space of the rf system may be reduced, and the miniaturization design of the rf system may be facilitated.

As shown in fig. 8 and 9, in one embodiment, if the low frequency signal includes a radio frequency signal in a low frequency band. For example, the frequency band of the low frequency signal may be one of N5, N8, N20, N28, and N71 frequency bands. The first transmit amplifying unit 2111 may include a first power amplifier, wherein an input terminal of the first power amplifier is an input terminal of the first transmit amplifying unit 2111, and an output terminal of the first power amplifier is an output terminal of the first transmit amplifying unit 2111. The first receiving and amplifying unit 2112 may comprise a first low noise amplifier, wherein an input terminal of the first low noise amplifier is an input terminal of the first receiving and amplifying unit 2112, and an output terminal of the first low noise amplifier is an output terminal of the first receiving and amplifying unit 2112. The second receiving and amplifying unit 2113 may comprise a second low noise amplifier, wherein an input terminal of the second low noise amplifier is an input terminal of the second receiving and amplifying unit 2113, and an output terminal of the second low noise amplifier is an output terminal of the second receiving and amplifying unit 2113.

With reference to fig. 8, the first filtering unit 212 may include a first duplexer 2121, wherein a first end of the first duplexer 2121 is connected to the output terminal of the first power amplifier, another first end of the first duplexer 2121 is connected to the input terminal of the first low noise amplifier, and a common end of the first duplexer 2121 is connected to the first antenna port LB _ ANT 1. The first duplexer 2121 may support filtering processing on a low-frequency signal, and separate a transceiving path of the low-frequency signal according to a signal direction of the low-frequency signal.

In the embodiment of the present application, the first duplexer 2121 may be embedded in the transceiver unit 211, that is, the first duplexer 2121 and the transceiver unit 211 are integrated in the same radio frequency device, for example, an L-MID device, so that the integration level of the transceiver module 210 may be improved, which is beneficial to miniaturization of the device, and reduces the cost, thereby reducing the occupied space of the radio frequency system.

Referring to fig. 9, in one embodiment, the first filtering unit 212 is externally disposed on the transceiving unit 211, and specifically, a first end of the first duplexer 2121 is connected to the output end of the first power amplifier via the first auxiliary port LB _ TXOUT, another first end of the first duplexer 2121 is connected to the input end of the second low noise amplifier via the second auxiliary port LB _ RXIN, and a common end of the first duplexer 2121 is connected to the first antenna port LB _ ANT1 via the third auxiliary port LB _ TRX.

Optionally, the first filtering unit 212 may further include a first filter, a second filter, and a plurality of radio frequency switches, so as to implement filtering processing on the low-frequency signal and separate the transceiving path of the low-frequency signal according to the signal direction of the low-frequency signal.

With continued reference to fig. 8 and 9, the second transmit amplifying unit 221 may include a second power amplifier 2211, wherein an input terminal of the second power amplifier 2211 is used as an input terminal of the second transmit amplifying unit 221, and an output terminal of the second power amplifier 2211 is used as an output terminal of the second transmit amplifying unit 221. The second filtering unit 222 may include a second duplexer 2221, wherein a first terminal of the second duplexer 2221 is connected to the output terminal of the second power amplifier 2211, another first terminal of the second duplexer 2221 is connected to the first auxiliary input port _ AUX, and a common terminal of the second duplexer 2221 is connected to the second antenna ANT 1. It should be noted that, in the embodiment of the present application, the second duplexer may also be replaced with another filter device having a filtering power, and the second filtering unit 222 is not further limited herein.

The first receiving module 310 may include a third low noise amplifier 311 and a third filtering unit 312. A first end of the third filtering unit 312 is connected to the second antenna port LB _ ANT2, a second end of the third filtering unit 312 is connected to an input end of the third low noise amplifier 311, and an output end of the third low noise amplifier 311 is connected to the radio frequency transceiver 100. The third filtering unit 312 is configured to filter the low frequency signal received through the second antenna port LB _ ANT2, so as to filter the stray waves except the low frequency signal, and output a clean low frequency signal. The third low-noise amplifier 311 is configured to perform low-noise amplification processing on the received low-frequency signal subjected to filtering processing. The second receiving module 320 may include a fourth low noise amplifier 321. The input end of the fourth low noise amplifier 321 is connected to the second auxiliary input port LAN IN AUX, and the output end of the third low noise amplifier 311 is connected to the radio frequency transceiver 100, and is configured to receive the low frequency signal received by the fourth antenna ANT3 through the second auxiliary input port LAN IN AUX, and perform low noise amplification processing on the received low frequency signal.

With continued reference to fig. 8, in one embodiment, the receiving circuit 300 further includes a filtering module 330. The filtering module 330 is respectively connected to the second auxiliary input port LAN IN AUX of the receiving circuit 300 and the fourth antenna ANT3, and the filtering module 330 is configured to perform filtering processing on the low-frequency signal received by the fourth antenna ANT 3. By providing the filtering module 330, the low-frequency signal received by the second receiving module 320 is a filtered signal, and the second receiving module 320 may perform low-noise amplification processing on the filtered low-frequency signal.

With continued reference to fig. 9, in one embodiment, the filtering module 330 may also be built into the LFEM device. The filtering module 330 may be disposed between the second receiving module 320 and the second auxiliary input port LAN IN AUX, so that the LFEM device can perform filtering and low noise amplification processing on a low frequency signal received through the fourth antenna ANT 3.

In the embodiment of the present application, the position of the filtering module 330 is not further limited, and the filtering module may be integrated in the receiving circuit 300 or externally disposed on the receiving circuit 300.

Based on the rf system shown in fig. 8, a two-way receiving path and a four-way receiving path of the N28A band signal are illustrated by taking the low frequency signal as an N28A band signal as an example.

A first transmission path: the rf transceiver 100 outputs a first N28A band transmission signal to the transceiver 211, and the first transmission signal enters the first transmit-amplify unit 2111 integrated inside to amplify the signal, and then the signal is filtered out of band by the built-in N28 first duplexer 2121, and then the filtered signal is output to the first antenna port LB _ ANT1 through the common port of the first duplexer 2121, and then the filtered signal is output to the first antenna ANT0 through the switch module 400.

A second transmission path: the rf transceiver 100 outputs a second path of N28A frequency band transmission signal, enters the second power amplifier 221 in the transmission module 220 for signal amplification, and enters the second duplexer 2221 for filtering after being output from the second transmission amplifying unit 221, and finally reaches the second antenna ANT 1.

A first reception path: the signal of N28A band in space received by the first antenna ANT0, the received signal of N28A band enter the first duplexer 2121 of N28 through the switch module 400 to filter out the out-of-band signal, the signal of N28A band is output from the first duplexer 2121 to the first receiving and amplifying unit 2112, and the received signal of N28A band is amplified and finally output to the rf transceiver 100.

A second reception path: the signal of the N28A frequency band and the signal of the N28A frequency band received by the second antenna ANT1 enter the second filtering unit 222 of the transmitting module 220 for filtering, and the filtered signal of the N28A frequency band enters the second receiving and amplifying unit 2113 of the transceiving unit 211 through the first auxiliary input port _ AUX to amplify the signal of the N28A frequency band, and finally output to the radio frequency transceiver 100.

A third reception path: the signal of N28A band in the space received by the third antenna ANT2, the received signal of N28A band enters the second antenna port LB _ ANT2 of the receiving circuit 300 through the switch module 400, the filtered signal of N28A band is filtered by the third filtering unit 312, the filtered signal of N28A band is amplified by the third low noise amplifier 311 to the received signal of N28A band, and finally the amplified signal is output to the rf transceiver 100.

A fourth reception path: the signal of the N28A frequency band in the space received by the fourth antenna ANT3, the received signal of the N28A frequency band are filtered by the filtering module 300, and the filtered signal of the N28A frequency band is amplified by the fourth low noise amplifier 321 to the received signal of the N28A frequency band, and finally output to the radio frequency transceiver 100.

Based on the rf system shown in fig. 9, a first transmit path and a first receive path of the N28A band signal are described by taking the low frequency signal as an N28A band signal as an example.

A first transmission path: the radio frequency transceiver 100 outputs a first path of N28A frequency band transmission signal to enter the transceiver unit 211, performs signal amplification through the first power amplifier 2111 integrated inside, outputs an amplified N28A frequency band signal through the first auxiliary port TXAUX1, enters the externally-mounted N28 first duplexer 212 to filter out-of-band signals, then outputs the out-of-band signals through the common end of the duplexer, reenters the transceiver unit 211 through the third auxiliary port TRX AUX of the transceiver unit 211, outputs the out-of-band signals through the first antenna port LB _ ANT1, and finally reaches the first antenna ANT 0.

A first reception path: the N28A band signal in the space received by the first antenna ANT0, the N28A band received signal enters the second end of the N28 first duplexer 212 through the first antenna port LB _ ANT1 and the third auxiliary port LB _ TRX, the out-of-band signal is filtered by the N28 duplexer, the N28A band signal is output from the first end of the duplexer, and enters the first low noise amplifier 2112 of the transceiver unit 211 through the second auxiliary port LB _ RXIN to amplify the N28A band received signal, and finally output to the rf transceiver 100.

The second transmitting path, the second receiving path, the third receiving path, and the fourth receiving path may refer to the foregoing description, and are not described herein again.

As shown in fig. 10, in one embodiment, the low-frequency signal includes a plurality of low-frequency band radio-frequency signals, and the frequency bands of the low-frequency signal include at least two of N5, N8, N20, N28 and N71, for example. When the first duplexer 2121 is built in the transceiver 211, the transceiver 211 has a plurality of first auxiliary input ports _ AUX, and the first duplexer 2121 has a plurality of first duplexers 2121, and the frequency bands of the rf signals output by the first duplexers 2121 are different. The number of the first auxiliary input ports _ AUX and the number of the first duplexers 2121 may be the same as the number of the low frequency bands of the low frequency signal, respectively. In the embodiment, for convenience of description, the low frequency signals include any two radio frequency signals in five low frequency bands, i.e., N5, N8, N20, N28, and N71.

Wherein, the transceiver unit may further include a first switch unit 2114, a second switch unit 2115 and a third switch unit 2116. A first end of the first switch unit 2114 is connected to an output end of the first power amplifier in the first transmit amplifier unit 2111, and a plurality of second ends of the first switch unit 2114 are respectively connected to a first end of the first duplexers 2121 in a one-to-one correspondence manner. The first switch unit 2114 is configured to selectively turn on the rf paths between the first power amplifier and a first end of each first duplexer 2121. A plurality of first terminals of the second switch unit 2115 are respectively connected to the common terminals of the first duplexers 2121 in a one-to-one correspondence manner, a second terminal of the second switch unit 2115 is connected to the first antenna port LB _ ANT1, and the second switch unit 2115 is configured to selectively turn on the rf paths between the first antenna port LB _ ANT1 and the common terminals of the first duplexers 2121. For example, the first switch unit 2114 and the second switch unit 2115 may be single-pole multi-throw switches. For example, the first switch unit 2114 and the second switch unit 2115 may both be SP9T switches.

Two first ends of the third switching unit 2116 are respectively connected to the input ends of the first receiving and amplifying unit 2112 and the second receiving and amplifying unit 2113 in a one-to-one correspondence manner, and a plurality of second ends of the third switching unit 2116 are respectively connected to another first end of the plurality of first duplexers 2121 and the plurality of first auxiliary input ports _ AUX in a one-to-one correspondence manner. Specifically, the third switching unit 2116 may include a plurality of independent radio frequency switches. For example, the third switching unit 2116 may include a first rf switch and a second rf switch, wherein a first end of the first rf switch is connected to the input terminal of the first low noise amplifier, and a plurality of second ends of the first rf switch are respectively connected to another first end of a portion of the first duplexer 2121 and a portion of the first auxiliary input ports _ AUX in a one-to-one correspondence. A first end of the second rf switch is connected to an input end of the second low noise amplifier, and a plurality of second ends of the second rf switch are respectively connected to another first end of the remaining first duplexer 2121 and the remaining first auxiliary input ports _ AUX in a one-to-one correspondence.

As shown in fig. 11, in one embodiment, the low frequency signal includes a plurality of radio frequency signals in a low frequency band, the number of the first duplexers 2121 is plural, at least one first duplexer 2121 is external to the transceiver unit 211, and the remaining first duplexers 2121 may be internal to the transceiver unit 211. It should be noted that, in the embodiment of the present application, the number of the first duplexers 2121 disposed in the transceiving unit 211 is not further limited. For convenience of illustration, the low frequency signal includes any three of N5, N8, N20, N28, and N71 frequency bands, one of which is an N28A frequency band signal. The number of the first duplexers 2121 externally disposed on the transceiver unit 211 is one, and the first duplexers 2121 and the second duplexers 2221 internally disposed in the transceiver unit 211 are two, and the first duplexers 2121 and the second duplexers 2221 are configured to output any two radio frequency signals in the N5, N8, N20, and N71 frequency bands.

Alternatively, the number of the first duplexers 2121 externally disposed on the transceiver unit 211 may be plural. When the number of the first duplexers 2121 externally disposed on the transceiver 211 is plural, the transceiver 211 may configure a plurality of sets of auxiliary ports, each of which may include a first auxiliary port LB _ TXOUT, a second auxiliary port LB _ RXIN, and a third auxiliary port LB _ TRX. A first end of the first switch unit 2114 is connected to an output end of the first power amplifier in the first transmit amplifier unit 2111, and a plurality of second ends of the first switch unit 2114 are respectively connected to the first auxiliary port LB _ TXOUT and a first end of each first duplexer 212 embedded in the transceiver unit 211 in a one-to-one correspondence manner. A plurality of first ends of the second switch unit 2115 are respectively connected to the third auxiliary port LB _ TRX and the common end of the second duplexer 2221 of each first duplexer 2121 built in the transceiver unit 211 in a one-to-one correspondence manner, and a second end of the second switch unit 2115 is connected to the first antenna port LB _ ANT 1. Two first ends of the third switching unit 2116 are respectively connected to the first receiving and amplifying unit 2112 and the second receiving and amplifying unit 2113 in a one-to-one correspondence manner, and a plurality of second ends of the third switching unit 2116 are respectively connected to another first end of each first duplexer 2121 and the second duplexer 2221 built in the transceiver unit 211, the second auxiliary port LB _ RXIN, and the plurality of first auxiliary input ports _ AUX in a one-to-one correspondence manner.

In the embodiment of the present application, the specific switch types of the first switch unit 2114, the second switch unit 2115 and the third switch unit 2116 and the composition form of the included radio frequency switch are not limited to the above-mentioned examples, and in the embodiment of the present application, the specific switch types of the first switch unit 2114, the second switch unit 2115 and the third switch unit 2116 and the composition form of the included radio frequency switch are not further limited.

The transceiver module 210 in this embodiment may support transmission and two-way reception processing of radio frequency signals in multiple low frequency bands, and may expand the bandwidth of the radio frequency system.

With continued reference to fig. 10 and 11, in one embodiment, the transceiver unit 211 further includes a coupler 2118. A coupler 2118 is provided on the radio frequency path between the second switching unit 2115 and the first antenna port LB _ ANT1 for coupling the low frequency signal on the radio frequency path to detect power information of the low frequency signal. The coupler can output the coupling signal to the rf transceiver 100 through the coupling output terminal CPL _ OUT. 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, the reverse power information of the low frequency signal can be correspondingly detected

With continued reference to fig. 10 and 11, in one embodiment, the transceiver unit 211 further includes a 2G low frequency transmit circuit 2101 and a 2G high frequency transmit circuit 2102. The 2G low frequency transmission circuit 2101 includes a third power amplifier and a first filter. The input end of the third power amplifier is connected with the input port GSM LB IN and used for supporting power amplification processing of 2G low-frequency signals, and the output end of the third power amplifier is connected with the first end of the unit of the second switch through the first filter. The first filter is used for filtering the 2G low-frequency signal. The 2G high-frequency transmission circuit 2102 includes a fourth power amplifier and a third filter. The input end of the fourth power amplifier is connected with the input port GSM HB IN and used for supporting power amplification processing of 2G high-frequency signals, and the output end of the fourth power amplifier is connected with the high-frequency output port GSM HB OUT through the third filter. The third filter is used for carrying out filtering processing on the 2G high-frequency signal.

In this embodiment, the radio frequency system may further support transmission processing of a 2G low-frequency signal and a 2G high-frequency signal, and may improve a frequency range of the radio frequency signal transmitted by the radio frequency system, so as to improve the general performance of the radio frequency system.

As shown in fig. 12, in one embodiment, the low-frequency signal includes a plurality of radio frequency signals in a low-frequency band, and the number of the second duplexers 2221 in the transmitting module 220 is plural. The number of the second duplexers 2221 may be the same as the number of the low frequency bands included in the radio frequency signal. Illustratively, the number of the second duplexers 2221 may be three, and the frequency bands of the low frequency signals output by the three second duplexers 2221 are different, where the three second duplexers 2221 may respectively output radio frequency signals of any three of the five low frequency bands N5, N8, N20, N28, and N71 in a one-to-one correspondence manner. The transceiver module 210 further includes: a fourth switching unit 223 and a fifth switching unit 224. A first end of the fourth switch unit 223 is connected to the output end of the second power amplifier 2211221, a plurality of second ends of the fourth switch unit 223 are respectively connected to a plurality of first ends of the second duplexers 2221 in a one-to-one correspondence manner, and another first end of the second duplexers 2221 is respectively connected to a plurality of first auxiliary input ports _ AUX in a one-to-one correspondence manner. The fourth switching unit 223 may selectively turn on the rf path between the second power amplifier 2211221 and any one of the second duplexers 2221. First ends of the fifth switch element 224 are respectively connected to common ends of the second duplexers 2221 in a one-to-one correspondence manner, and a second end of the fifth switch element 224 is connected to the second antenna ANT 1. The fifth switching unit 224 may selectively turn on the rf path between the second antenna ANT1 and any one of the second duplexers 2221. Specifically, the fourth switch unit 223 and the fifth switch unit 224 may be single-pole multi-throw switches, and may be SP9T switches, for example.

Referring to fig. 12, in one embodiment, the low frequency signal includes a plurality of low frequency band rf signals, the number of the second auxiliary input ports in the receiving circuit 300 is multiple, and the number of the third filtering units 312 is also multiple. The number of the third filtering units 312 may be the same as the number of the low frequency bands included in the low frequency signal, and the frequency bands of the low frequency signal output by each of the third filtering units 312 are different. Wherein the first receiving module comprises: a third low noise amplifier 311, a sixth switching unit 313, a seventh switching unit 314, and a plurality of third filtering units 312. An input terminal of the third low noise amplifier 311 is connected to a first terminal of the sixth switching unit 313, and an output terminal of the third low noise amplifier 311 is connected to the rf transceiver 100; a plurality of second ends of the sixth switching unit 313 are respectively connected to a plurality of second auxiliary input ports and a plurality of first ends of the third filtering units 312 in a one-to-one correspondence manner; second ends of the third filtering units 312 are respectively connected to first ends of the seventh switching unit 314 in a one-to-one correspondence manner, and a second end of the seventh switching unit 314 is connected to the second antenna port LB _ ANT 2.

The second receiving module includes a fourth low noise amplifier 321, wherein an input terminal of the fourth low noise amplifier 321 is connected to a first terminal of the sixth switching unit 313, and an output terminal of the fourth low noise amplifier 321 is connected to the rf transceiver 100.

The filtering module 330 includes an eighth switching unit 332 and a plurality of fourth filtering units 331. The number of the fourth filtering units 331 may be the same as the number of the low frequency bands included in the low frequency signal, and the frequency bands of the radio frequency signals output by the plurality of fourth filtering units 331 included in the filtering module 330 are different. First ends of the fourth filtering units 331 are respectively connected to second ends of the sixth switching units 313 in a one-to-one correspondence manner, second ends of the fourth filtering units 331 are respectively connected to first ends of the eighth switching units 332 in a one-to-one correspondence manner, and a second end of the eighth switching unit 332 is connected to the fourth antenna ANT 3. In the embodiment of the present application, the plurality of fourth filtering units 331 included in the filtering module 330 may be partially built in the receiving circuit 300, partially external to the receiving circuit 300, or entirely built in the receiving circuit 300, or entirely external to the receiving circuit 300. For example, the fourth filtering unit 331 for outputting the N28A frequency band may be disposed outside the receiving circuit 300, and the third filtering unit 312 for outputting the radio frequency signals of other frequency bands may be disposed inside the receiving circuit 300. In the embodiment of the present application, the arrangement positions of the plurality of fourth filtering units 331 are not limited.

Based on the rf system shown in fig. 12, the working principle of the third receiving path and the fourth receiving path is illustrated by taking the N28A frequency band signal as an example.

A third reception path: the third antenna ANT2 receives a frequency band signal of N28A from the space, then the frequency band signal of N28A passes through the switch module 400 to the switch circuit 300, then passes through the third antenna ANT2 port LB _ ANT2 of the receiver circuit 300 to enter the interior of the receiver circuit 300, passes through the seventh switch unit 314 inside to enter the third filter unit 312 to filter out-of-band noise of the low frequency signal, then passes through the sixth switch unit 312 to enter the third low noise amplifier 311 to amplify the reception, and finally enters the radio frequency transceiver 100.

A fourth reception path: the fourth antenna ANT3 receives a frequency band signal of N28A from the space, and then the frequency band signal of N28A enters the fourth filtering unit 331 through the eighth switching unit 332 to filter out-of-band noise of the low frequency signal, and then enters the receiving circuit 300 through the second auxiliary input port IN AUX, and enters the fourth low noise amplifier 321 through the sixth switching unit 312 to amplify the reception, and finally enters the rf transceiver 100.

As shown in fig. 13, in one embodiment, the transmitting module 220 further includes a coupling unit 225 disposed on a radio frequency path between the second filtering unit 222 and the second antenna ANT1, and configured to couple the low frequency signal on the radio frequency path to detect power information of the low frequency signal. The coupling unit 225 may output a coupling signal to the rf transceiver 100. 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.

As shown in fig. 14, in one embodiment, the receiving circuit 300 further includes a third receiving module 340 for supporting filtering and low noise amplification processing on the middle and high frequency signals. The medium-high frequency signals may include radio frequency signals of a plurality of medium frequency bands and radio frequency signals of a plurality of high frequency bands, where the radio frequency signals may be 4G signals or 5G signals.

In this embodiment, by providing the third receiving module 340 in the receiving circuit 300, the frequency range of the receiving circuit 300 receiving the radio frequency signal can be expanded, so as to improve the receiving frequency range of the radio frequency system.

As shown in fig. 15, in one embodiment, the rf system further includes a first amplifying module 500. The first amplification module 500 may be disposed on a receiving path between the first auxiliary input port _ AUX and the second antenna ANT1, and configured to amplify the received low-frequency signal. Specifically, an input end of the first amplifying module 500 is connected to the first filtering unit 212, and an output end of the first amplifying module is connected to the first auxiliary input port _ AUX. Specifically, the first amplifying module 500 may include a fifth low noise amplifier, an input end of the fifth low noise amplifier is used as the input end of the first amplifying module 500, and an output end of the fifth low noise amplifier is used as the output end of the first amplifying module 500.

For convenience of explanation, based on the rf system shown in fig. 15, the signal receiving process of the second receiving path of the low-frequency signal in this embodiment is described by taking the rf signal in the N28A frequency band as an example:

a second reception path: the N28A band signal in the space received by the second antenna ANT1, the received signal in the N28A band enters the transmitting module 220, and is output to the filtering unit 222 through the fifth switch unit for filtering, the filtered signal in the N28A band is amplified by the first amplifying module 500 and then output to the first auxiliary input port _ AUX, and enters the second low noise amplifier of the second amplifying and receiving unit 2111 for secondary amplification of the received signal in the N28A band, and finally output to the radio frequency transceiver 100.

It should be noted that, the foregoing description may be referred to for other receiving paths and transmitting paths, and thus, the description is omitted here.

In the embodiment of the present application, by providing the first amplification module 500 between the first auxiliary input port _ AUX and the second antenna ANT1, it can be understood that two stages of low noise amplifiers (a fifth low noise amplifier and a second low noise amplifier) are provided in the second receiving path, so that the signal strength of the low frequency signal received in the second receiving path can be improved, further, the receiving performance of the low frequency signal in the second receiving path can be prevented from being affected by the low efficiency of the second antenna ANT1 and the insertion loss of the second low noise amplifier, and the receiving performance of the low frequency signal in the second receiving path can be improved.

As shown in fig. 16, in one embodiment, the radio frequency system further comprises a second amplification module 600. The second amplifying module 600 is disposed on a radio frequency path between the fourth antenna ANT3 and the second auxiliary input port LAN IN AUX, and is configured to amplify the received low-frequency signal. Specifically, an input end of the second amplifying module 600 is connected to the filtering module 330, and an output end of the second amplifying module 600 is connected to the second auxiliary input port LAN IN AUX. Specifically, the second low noise amplifier module may include a sixth low noise amplifier, an input terminal of the sixth low noise amplifier is used as the input terminal of the second low noise amplifier, and an output terminal of the sixth low noise amplifier is used as the output terminal of the second amplifying module 600.

For convenience of explanation, based on the rf system shown in fig. 16, a signal receiving process of the fourth receiving path of the low-frequency signal in the present embodiment is described by taking an rf signal in the N28A frequency band as an example:

a fourth reception path: the fourth antenna ANT3 receives the N28A band signal from the space, then the N28A band signal enters the filtering module 330 to filter out-of-band noise of the low frequency signal, then the sixth low noise amplifier IN the second amplifying module 600 amplifies the received N28A band signal, then the signal enters the receiving circuit 300 through the second auxiliary input port IN AUX, and the signal enters the fourth low noise amplifier 321 through the sixth switching unit 312 to perform secondary amplification processing on the received N28A band signal, and finally the signal enters the radio frequency transceiver 100.

IN the embodiment of the present application, by providing a second amplifying module 600 between the second auxiliary input port LAN IN AUX and the fourth antenna ANT3, it can be understood that two stages of low noise amplifiers (a sixth low noise amplifier and a fourth low noise amplifier) are provided IN the fourth receiving path, so that the signal strength of the low frequency signal received IN the fourth receiving path can be improved, and further, the receiving performance of the low frequency signal IN the fourth receiving path can be prevented from being affected by the low efficiency of the fourth antenna ANT3 and the insertion loss far from the fourth low noise amplifier 321, and the receiving performance of the low frequency signal IN the fourth receiving path can be improved.

The embodiment of the application also provides communication equipment, and the communication equipment is provided with the radio frequency system in any embodiment.

By arranging the radio frequency system on the communication equipment, 4-by-4 MIMO (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 transmitting 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. 17, further taking the communication device as a mobile phone 11 for illustration, specifically, as shown in fig. 17, the mobile phone 11 may include a memory 21 (which optionally includes one or more computer-readable storage media), a processing circuit 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. It will be appreciated by those skilled in the art that the handset 11 shown in figure 17 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. 17 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.

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

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

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:

two first ends of the switch module are respectively configured to be connected to the first transceiving path and the first receiving path in a one-to-one correspondence manner, and two second ends of the switch module are respectively connected to the first antenna and the third antenna in a one-to-one correspondence manner.

3. The rf system of claim 2, wherein the first transceiving path comprises a first transmit path and a first sub-receive path, and the second transceiving path comprises a second transmit path and a second sub-receive path, wherein the transceiving circuitry comprises:

a transceiver module connected to the radio frequency transceiver and configured with the first transmit path for supporting transmit processing of the low frequency signal, the first sub-receive path for supporting receive processing of the low frequency signal, and the second sub-receive path for supporting receive processing of the low frequency signal, wherein the transceiver module switchably connects the first antenna and the third antenna through the switch module;

a transmitting module connected to the RF transceiver, the transceiving module, and the second antenna, respectively, and configured with the second transmitting path for supporting transmission of the low-frequency signal.

4. The radio frequency system according to claim 3, wherein two first ends of the switch module are respectively connected to the transceiver module and the receiving circuit in a one-to-one correspondence manner, and two second ends of the switch module are respectively connected to the first antenna and the third antenna in a one-to-one correspondence manner.

5. The RF system of claim 3, wherein the first antenna and the third antenna each have an antenna efficiency higher than that of the second antenna and the fourth antenna, and wherein the RF transceiver is configured to configure a target antenna connected to the first sub-receiving path according to the network information of the low-frequency signals received by the first sub-receiving path and the first receiving path, and the target antenna is one of the first antenna and the third antenna.

6. The radio frequency system of claim 5, wherein the first antenna is configured as a default target antenna for the low frequency signal, and wherein the radio frequency transceiver is configured to:

and if the difference value between the first signal strength based on the low-frequency signal received by the first sub-receiving path and the second signal strength based on the low-frequency signal received by the first receiving path is less than or equal to a preset threshold value in a preset time period, configuring the third antenna as the target antenna.

7. The radio frequency system according to claim 3, wherein the transceiver module comprises a transceiver unit and a first filter unit, wherein the transceiver unit is configured with a first input port, a first output port, a second output port, a first antenna port, and a first auxiliary input port; wherein the first antenna port is switchably connected to the first antenna and the third antenna via the switch module;

the transceiver unit includes: a first transmitting amplifying unit, a first receiving amplifying unit and a second receiving amplifying unit, wherein,

the transmitting and amplifying unit is used for performing power amplification on the low-frequency signal received by the first input port, transmitting the amplified low-frequency signal to the first filtering unit for filtering, and transmitting the filtered low-frequency signal to the first antenna port to realize transmitting of the low-frequency signal;

the first antenna port outputs the received low-frequency signal to the first filtering unit for filtering processing, the filtered low-frequency signal is transmitted to the first receiving and amplifying unit for low-noise amplification processing, and the low-frequency signal after the low-noise amplification processing is transmitted to the first output port, so that the low-frequency signal is received and processed;

the first auxiliary input port outputs the low-frequency signal after filtering to the second receiving and amplifying unit for low-noise amplification, and outputs the low-frequency signal after low-noise amplification to the second output port, so as to receive and process the low-frequency signal.

8. The radio frequency system according to claim 7, wherein an input terminal of the first transmit amplifying unit is connected to the first input port, and an output terminal of the first transmit amplifying unit is connected to the first antenna port through the first filtering unit;

the input end of the first receiving amplification unit is connected with the first antenna port through the first filtering unit, and the output end of the first receiving amplification unit is connected with the first output port;

the input end of the second receiving amplification unit is connected with the first auxiliary input port, and the output end of the second receiving amplification unit is connected with the second output port.

9. The radio frequency system according to claim 7, wherein the transceiver unit is further configured with a first auxiliary port, a second auxiliary port, and a third auxiliary port, wherein an input terminal of the first transmission amplifying unit is connected to the first input port, and an output terminal of the first transmission amplifying unit is connected to the first auxiliary port;

the input end of the first receiving amplification unit is connected with the second auxiliary port, and the output end of the first receiving amplification unit is connected with the first output port;

the input end of the second receiving amplification unit is connected with the first auxiliary input port, and the output end of the second receiving amplification unit is connected with the second output port; wherein,

two first ends of the first filtering unit are respectively connected with the first auxiliary port and the second auxiliary port in a one-to-one correspondence manner, and a common end of the first filtering unit is connected with the first antenna port through the third auxiliary port.

10. A radio frequency system according to claim 8 or 9, characterized in that the first filtering unit comprises at least one first duplexer.

11. The radio frequency system of claim 3, wherein the transmission module comprises:

the input end of the second transmitting and amplifying unit is connected with the radio frequency transceiver and is used for performing power amplification processing on the received low-frequency signal;

and two first ends of the second filtering unit are respectively connected with the output end of the second transmitting amplification unit and the first auxiliary port, and a second end of the second filtering unit is connected with the second antenna, wherein the second filtering unit is used for filtering the low-frequency signals output by the transmitting amplification unit and outputting the low-frequency signals to the second antenna, and the second filtering unit is used for filtering the low-frequency signals received by the second antenna and outputting the low-frequency signals to the first auxiliary port.

12. The radio frequency system according to claim 3, further comprising:

and the input end of the first amplification module is connected with the second antenna, and the output end of the first amplification module is connected with the first sub-receiving passage and is used for amplifying the received low-frequency signal.

13. The radio frequency system of claim 3, wherein the receive circuit is configured with a second antenna port for connection with the third antenna and a second auxiliary input port for connection with the fourth antenna, wherein the receive circuit comprises:

the first receiving module is configured with the first receiving path which is respectively connected with the radio frequency transceiver and a second antenna port, and the first receiving path is used for filtering and low-noise amplifying the low-frequency signal transmitted by the second antenna port and transmitting the low-frequency signal to the radio frequency transceiver so as to receive the low-frequency signal; wherein the second antenna port switchably connects the first antenna and the third antenna through the switching module,

and the second receiving module is configured with a second receiving path which is respectively connected with the second auxiliary input port and the radio frequency transceiver, and the second receiving path is used for performing low-noise amplification processing on the low-frequency signal transmitted through the second auxiliary input port and transmitting the low-frequency signal to the radio frequency transceiver so as to receive the low-frequency signal.

14. The radio frequency system of claim 13, further comprising:

and the second amplification module is arranged on a radio frequency path between the fourth antenna and the second auxiliary input port and is used for amplifying the received low-frequency signal.

15. A communication device comprising a radio frequency system according to any of claims 1-14.