CN113949401B

CN113949401B - Radio frequency system and communication equipment

Info

Publication number: CN113949401B
Application number: CN202111449145.6A
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: 2022-12-09
Anticipated expiration: 2041-11-30
Also published as: CN113949401A

Abstract

The application relates to a radio frequency system and a communication device. The radio frequency system includes: the antenna comprises a radio frequency transceiver, a transceiving circuit, a first antenna and a second antenna, wherein the radio frequency transceiver is connected with the radio frequency transceiver and is configured with a first transceiving path used for being connected with the first antenna and a second transceiving path used for being connected with the second antenna, and the first transceiving path is used for supporting the transmission and the reception of low-frequency signals; a second transceiving path for supporting transmission and reception of the low frequency signal; and the receiving circuit is connected with the radio frequency transceiver and is configured with a first receiving path used for being connected with a third antenna and a second receiving path used for being connected with a fourth antenna, wherein the first receiving path and the second receiving path are respectively used for supporting the receiving processing of the low-frequency signals, and the radio frequency system can realize 4 x 4MIMO receiving of the low-frequency signals and dual-path transmission of the low-frequency signals and has better receiving and transmitting performance.

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, building depths or elevators.

Disclosure of Invention

The embodiment of the application provides a radio frequency system and communication equipment, which can realize 4 x 4MIMO receiving of low-frequency signals and double-path transmitting of the low-frequency signals, so that the radio frequency system has better receiving and transmitting performances.

A radio frequency system, comprising:

a radio frequency transceiver;

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

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

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

Above-mentioned radio frequency system and communication equipment, radio frequency system include radio frequency transceiver, transceiver circuit and receiving circuit, and wherein, transceiver circuit disposes can support two way transceiver path to low-frequency signal receiving and transmission processing, and receiving circuit disposes can support two way receiving path to low-frequency signal receiving processing, and then can realize transmit diversity and ascending 2 x 2MIMO function and 4 x 4MIMO receiving function down to low-frequency signal. If the rf system provided in this embodiment is in an environment with good signals, compared to an rf 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 communication rate can be doubled, and the uplink coverage distance can be doubled, which can improve the channel capacity and the reception and transmission performance of the rf system by multiple times.

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 schematic diagram of an embodiment of an 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 fifth schematic diagram of an embodiment of a radio frequency system;

FIG. 6 is a sixth schematic diagram of an embodiment of a receiver circuit;

FIG. 7 is a seventh schematic diagram of an exemplary RF system;

FIG. 8 is a diagram illustrating an exemplary transceiver circuit;

FIG. 9 is a schematic diagram of a transceiver circuit according to another embodiment;

FIG. 10 is an eighth schematic block diagram of an exemplary RF system;

FIG. 11 is a ninth block diagram illustrating an exemplary RF system;

FIG. 12 is a diagram showing a schematic structure of an RF system according to an embodiment;

FIG. 13 is a schematic diagram of the structure of a receiving circuit in one embodiment;

fig. 14 is a schematic diagram of a distribution of four antennas in a communication device according to an 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: the antenna comprises a radio frequency transceiver 100, a transceiver circuit 200, a receiving circuit 300, a first antenna ANT1, a second antenna ANT2, a third antenna ANT3 and a fourth antenna ANT4.

In this embodiment, the first antenna ANT1, the second antenna ANT2, the third antenna ANT3, and the fourth antenna ANT4 are all capable of supporting transmission and reception of low frequency signals. 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 one low frequency band, or may include radio frequency signals of a plurality of low frequency bands. The radio frequency signal may comprise 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 to which the transceiving circuit 200 and the receiving circuit 300 can be connected, respectively. Therein, the transceiving circuit 200 is configured with a first transceiving path and a second transceiving path. Wherein the first transceiving path is configured for connection with the first antenna ANT0 for supporting transmission and reception of low frequency signals. The second transceiving path is configured for connection with a second antenna ANT1 for supporting transmission and reception of low frequency signals. The first transceiving path and the second transceiving path can cooperate with the two antennas to jointly support dual-path reception of low-frequency signals so as to support a downlink 2 x 2MIMO function of the low-frequency signals and jointly support dual-path transmission processing of the low-frequency signals so as to support an uplink 2 x 2MIMO function of the low-frequency signals.

A receiving circuit 300 configured with a first receiving path RX3 and a second receiving path RX4, wherein the first receiving path RX3 is configured for connection with the third antenna ANT2, and the second receiving path RX4 is configured for connection with the fourth antenna ANT 3. The first receiving path RX3 and the second receiving path RX4 are respectively used to support the receiving process of the low frequency signal.

The first transceiving path and the second transceiving path configured by the transceiving circuit 200 and the first receiving path RX3 and the second receiving path RX4 configured by the receiving circuit 300 may be correspondingly connected to a unique antenna, and each (sub) receiving path may respectively perform receiving processing on the low frequency signal received by the antenna, and correspondingly transmit the processed low frequency signal to a corresponding port of the radio frequency transceiver 100. For example, each of the transceiving path and the receiving path may filter and amplify the received low frequency signal, and transmit the processed low frequency signal to the radio frequency 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 on 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 of the N28 band signal. If the low frequency signals include N5, N8, N20, N28, and N71 band signals, the rf system may support transmit diversity and uplink 2 × 2mimo functions and downlink 4 × 4mimo receiving functions for the N5, N8, N20, N28, and N71 band signals.

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 and uplink 2 × 2mimo function and 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 that can only support low-frequency 2 × 2mimo reception and single-channel transmission in the related art, 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 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 meanwhile, 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.

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 RX2. 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. With continued reference to fig. 2, 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 for supporting transmit processing of the low frequency signal, a first sub-receive path RX1 for performing receive processing of the low frequency signal, and a second sub-receive path RX2 for performing receive processing of the low frequency signal. Wherein, the first transmit path TX1 and the first sub-receive path RX1 are respectively configured to be connected to the first antenna ANT0. Specifically, the first transmission path TX1 may be configured to support power amplification and filtering processing on a low-frequency signal, so as to implement transmission on the low-frequency signal; the first sub-receiving path RX1 may be used to support filtering and low-noise amplification processing on a 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 used 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. Specifically, the second transmission path TX2 may be used for power amplification and filtering processing of the low-frequency signal to implement transmission processing of the low-frequency signal. In this embodiment, 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 filtering processing, and perform low-noise amplification processing on the low-frequency signal after filtering processing, so as to implement reception of the low-frequency signal.

As shown in fig. 3, in one embodiment, if the low frequency signal includes a radio frequency signal in a low frequency band. Illustratively, the low frequency band may be one of N5, N8, N20, N28, and N71 bands. The transceiver module includes: a transceiver unit 211 and a first duplexer 212. The first duplexer 212 is configured to filter stray waves other than the low-frequency signal and output only a radio frequency signal in a preset low-frequency band. The transceiver 211 may be a Power Amplifier module (PA Mid) with a built-in low noise Amplifier, which may be referred to as an L-PA Mid device for short. Specifically, the transceiving unit 211 is configured with a first input port pair, a first output port LNAOUT1, and a second output port LNAOUT2 for connecting with the radio frequency transceiver 100, a first antenna port LB _ ANT1 for connecting with the first antenna ANT0, and a first auxiliary input port LNA _ AUX for connecting with the transmitting module 220. The transceiver unit 211 includes a first power amplifier 2111, a first low noise amplifier 2112 and a second low noise amplifier 2113.

The first transmit path may be formed by the first input port pair, the first power amplifier 2111, the first duplexer 212, and the first antenna port LB _ ANT1. And the transmission processing of the low-frequency signal can be realized based on the first transmission path. Specifically, the first power amplifier 2111 performs power amplification on the low-frequency signal received by the first input port PA IN, transmits the amplified low-frequency signal to the first duplexer 212 for filtering, and transmits the filtered low-frequency signal to the first antenna port LB _ ANT1, so as to implement transmission processing on the low-frequency signal. The first sub-receiving path may be formed by the first antenna port LNAOUT1, the first duplexer 212, the first low noise amplifier 2112 and the first output port LNA OUT 1. Specifically, the first antenna port LB _ ANT1 outputs the received low-frequency signal to the first duplexer 212 for filtering, the filtered low-frequency signal is transmitted to the first low noise amplifier 2112 for low noise amplification, and the low-frequency signal after low noise amplification is transmitted to the first output port LNA OUT1, so as to implement the receiving of the low-frequency signal. The second sub-receive path may be composed of the first auxiliary input port LNA _ AUX, the second low noise amplifier 2113, and the second output port LNA OUT 2. Specifically, the first auxiliary input port LNA _ AUX outputs the low-frequency signal after filtering to the second low-noise amplifier 2113 for low-noise amplification, and outputs the low-frequency signal after low-noise amplification to the second output port LNAOUT2, so as to implement receiving processing of the low-frequency signal. An input terminal of the first power amplifier 2111 is connected to the first input port PA IN, and an output terminal of the first power amplifier 2111 is directly or indirectly connected to the first duplexer 212. The input terminal of the first low noise amplifier 2112 is connected to the first duplexer 212 directly or indirectly; the output of the first low noise amplifier 2112 is connected to said first output port LNA OUT 1. An input terminal of the second low noise amplifier 2113 is connected to the first auxiliary input port LNA _ AUX, and an output terminal of the second low noise amplifier 2113 is connected to the second output port LNA OUT 2.

With continued reference to fig. 3, in one embodiment, the first duplexer 212 may be embedded in the transceiver unit 211. Specifically, when the first duplexer 212 is directly connected to the first power amplifier 2111 and the first low noise amplifier 2112, respectively, it can be understood that the first duplexer 212 is built in the transceiver unit 211. A first end of the first duplexer 212 is connected to the output end of the first power amplifier 2111, another first end of the first duplexer 212 is connected to the input end of the first low noise amplifier 2112, and the common end of the first duplexer 212 is connected to the first antenna port LB _ ANT1.

In the embodiment of the present application, the first duplexer 212 may be embedded in the transceiver unit 211, that is, the first duplexer 212 and the transceiver unit 211 are integrated in the same radio frequency device, for example, an L-PA Mid device, which may improve the integration level of the transceiver module 210, facilitate miniaturization of the device, reduce the cost, and further reduce the occupied space of the radio frequency system.

As shown in fig. 3 and 4, in one embodiment, the transmitting module 220 includes a second power amplifier 221 and a first filtering unit 222. The input terminal of the second power amplifier 221 is connected to the radio frequency transceiver 100, and is configured to perform power amplification processing on the received low-frequency signal. The first filtering unit 222 is respectively connected to the output end of the second power amplifier 221, the first auxiliary input port LNA _ AUX of the transceiver module 210, and the second antenna ANT1, and is configured to perform filtering processing on a received low-frequency signal.

In one embodiment, the first filtering unit 222 includes a third duplexer, wherein a first end of the third duplexer is connected to the output terminal of the second power amplifier 221, another first end of the third duplexer is connected to the first auxiliary input port LNA _ AUX, and a common terminal of the third duplexer is connected to the second antenna ANT1.

It should be noted that, in the embodiment of the present application, the third duplexer may also be replaced by another filter device having a filtering power, and the first filtering unit is not further limited herein.

Based on the rf system shown in fig. 3, the low frequency signal is used as an N28A band signal to describe two transmission paths, a first sub-receiving path and a second sub-receiving path of the N28 band signal.

A first transmission path: the rf transceiver 100 outputs an N28A band transmission signal to the transceiver unit 211, and the transmission signal is amplified by the first power amplifier 2111 integrated inside, filtered by the first duplexer 212 built inside, output from the common terminal of the first duplexer 212, output through the first antenna port LB _ ANT1, and finally reach the first antenna ANT0.

A second transmission path: the rf transceiver 100 outputs an N28A band transmit signal, enters the second power amplifier 221 in the transmit module 220 for signal amplification, and enters the first filter unit 222 for filtering after being output from the second power amplifier 221, and finally reaches the second antenna ANT1.

A first sub-reception path: the N28A band signal in the space received by the first antenna ANT0 enters the first duplexer 212, the out-of-band signal is filtered by the first duplexer 212, and the N28A band signal is output from the first duplexer 212 to the first low noise amplifier 2112, where the N28A band signal is amplified and finally output to the rf transceiver 100.

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

With continued reference to fig. 4, when the first duplexer 212 is indirectly connected to the first power amplifier 2111 and the first low noise amplifier 2112, it can be understood that the first duplexer 212 is externally disposed on the transceiver unit 211. The transceiver unit 211 is additionally configured with 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 duplexer 212 is connected to the output end of the first power amplifier 2111 through the first auxiliary port LB _ TXOUT, another first end of the first duplexer 212 is connected to the input end of the second low noise amplifier 2113 through the second auxiliary port LB _ RXIN, and a common end of the first duplexer 212 is connected to the first antenna port LB _ ANT1 through the third auxiliary port LB _ TRX.

Based on the rf system shown in fig. 4, the low frequency signal is used as an N28A band signal to illustrate two transmission paths, a first sub-reception path and a second sub-reception path of the N28A band signal.

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 the amplified N28A frequency band signal through the first auxiliary port LB _ TXOUT, enters the first add-on duplexer 212 to filter out-of-band signals, outputs the out-of-band signals through the common end of the duplexer, reenters the transceiver unit 211 through the third auxiliary port LB _ TRX of the transceiver unit 211, outputs the out-of-band signals through the first antenna port LB _ ANT1, and finally reaches the first antenna ANT0.

A first sub-reception path: the N28A band signal in the space received by the first antenna ANT0 enters the common port of the 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 N28A duplexer, the N28A band signal is output from the first end of the first duplexer 212, enters the first low noise amplifier 2112 of the transceiver unit 211 through the second auxiliary port LB _ RXIN to amplify the N28A band signal, and finally is output to the radio frequency transceiver 100 through the first output port LNA _ OUT 1.

A second sub-reception path: the N28A band signal in the space received by the second antenna ANT1, the N28A band signal enters the filtering unit 222 of the transmitting module 220 for filtering, the filtered N28A band signal enters the second low noise amplifier 2113 of the transceiving unit 211 through the first auxiliary input port LNA _ AUX to amplify the N28A band signal, and finally, the signal is output to the rf transceiver 100 through the second output port LNA _ OUT 2.

As shown IN fig. 5, 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. Specifically, the receiving circuit 300 includes a first receiving module 310 and a second receiving module 320. 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 the 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 receiving processing of the low-frequency signal. 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 implement receiving processing on the low-frequency signal.

As shown in fig. 6, the first receiving module 310 may include a third low noise amplifier 311 and a second filtering unit 312. A first end of the second filtering unit 312 is connected to the second antenna port LB _ ANT2, a second end of the second 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 second 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 low-frequency signal after the 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.

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 this embodiment, 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 noise amplifier module (LFEM), which may specifically include a Low noise amplifier and at least one filter, and may be configured to support a receiving process for Low-frequency signals (e.g., a 4G LTE signal and a 5G NR signal that include at least one Low-frequency band). In the embodiment of the application, the LFEM device is arranged, so that the integration level of the radio frequency system can be improved, the occupied space of the radio frequency system is reduced, and the miniaturization design of the radio frequency system is facilitated.

With continued reference to fig. 6, in one embodiment, the receiving circuit 300 further includes a filtering module 330. The filtering module 330 is connected to the second auxiliary input port LAN IN AUX of the receiving circuit 300 and the fourth antenna ANT3, respectively, and the filtering module 330 is configured to filter 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 on the filtered low-frequency signal.

As shown in fig. 7, 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 may perform filtering and low noise amplification processing on a low frequency signal received through the fourth antenna ANT 3.

Based on the rf system shown in fig. 7, the first receiving path and the second receiving path of the N28A band signal are illustrated by taking the low frequency signal as the N28 band signal.

A first reception path: the signal of the N28A band in the space received by the third antenna ANT2, the received signal of the N28A band enters the receiving circuit 300, is filtered by the first filtering unit 312 in the first receiving module 310 and is amplified by the third low noise amplifier 311, and finally is output to the radio frequency transceiver 100.

A second reception path: the signal of the N28A band received by the fourth antenna ANT3 enters the receiving circuit 300, is filtered by the filtering module 330, is amplified by the fourth low noise amplifier 321 in the second receiving module 320, and is finally output to the rf 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.

As shown in fig. 8, in one embodiment, the low frequency signal includes a plurality of low frequency bands of radio frequency signals, and for example, the plurality of low frequency bands may include at least two of N5, N8, N20, N28, and N71 bands. When the first duplexer 212 is built in the transceiver unit 211, the transceiver unit 211 includes a plurality of first auxiliary input ports LNA _ AUX, the first duplexer 212 includes a plurality of first auxiliary input ports LNA _ AUX, and the frequency bands of the rf signals output by the first duplexers 212 are different. The number of the first auxiliary input ports LNA _ AUX and the number of the first duplexers 212 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.

The transceiver unit 211 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 the output end of the first power amplifier 2111, and a plurality of second ends of the first switch unit 2114 are respectively connected to a first end of the plurality of first duplexers 212 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 2111 and a first end of each first duplexer 212. A plurality of first ends of the second switch unit 2115 are respectively connected to the common ends of the first duplexers 212 in a one-to-one correspondence manner, a second end of the second switch unit 2115 is connected to the first antenna port LB _ ANT1, and the second switch unit 2115 may be configured to selectively conduct the rf paths between the first antenna port LB _ ANT1 and the common ends of the first duplexers 212. 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 be both SP9T switches.

Two first ends of the third switching unit 2116 are respectively connected to the input ends of the first low noise amplifier 2112 and the second low noise amplifier 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 212 and the plurality of first auxiliary input ports LNA _ AUX in a one-to-one correspondence manner. Specifically, the third switch unit 2116 may include a plurality of independent rf switches, and for example, the third switch 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 end of the first low noise amplifier 2112, a plurality of second ends of the first rf switch are respectively connected to another first end of a portion of the first duplexer 212, and a portion of the first auxiliary input ports LNA _ AUX in a one-to-one correspondence manner. A first terminal of the second rf switch is connected to an input terminal of the second low noise amplifier 2113, and a plurality of second terminals of the second rf switch are respectively connected to another first terminal of the remaining first duplexer 212 and the remaining first auxiliary input ports LNA _ AUX in a one-to-one correspondence.

As shown in fig. 9, in one embodiment, the low frequency signal includes a plurality of radio frequency signals in a low frequency band, and the first duplexer 212 is external to the transceiver unit 211. The transceiver unit 211 further includes: a first switching unit 2114, a second switching unit 2115, a third switching unit 2116, and a plurality of second duplexers 2117. The second duplexer 2117 is configured to filter out stray waves other than the low-frequency signal, and frequency bands of the radio frequency signals output by the second duplexer 2117 and the first duplexer 212 are different. The total number of the first duplexer 212 and the second duplexer 2117 may be the same as the number of bands of the low frequency band. The number of the first duplexers 212 externally disposed on the transceiver 211 may be one or more. It should be noted that, in the embodiment of the present application, the number of the first duplexers 212 disposed in the transceiving unit 211 is not further limited.

In the embodiment of the present application, 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 212 is one, and the first duplexers 212 are configured to output signals in the N28A frequency band, and the number of the second duplexers 2117 is two, and the second duplexers 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 212 may be plural. When the number of the first duplexers 212 is plural, the transceiver unit 211 may configure a plurality of sets of auxiliary ports, each of which may include the first auxiliary port LB _ TXOUT, the second auxiliary port LB _ RXIN, and the third auxiliary port LB _ TRX. A first terminal of the first switch unit 2114 is connected to the output terminal of the first power amplifier 2111, and a plurality of second terminals of the first switch unit 2114 are respectively connected to the first auxiliary port LB _ TXOUT and a first terminal of the second duplexers 2117 in a one-to-one correspondence. A plurality of first ends of the second switch unit 2115 are respectively connected to the third auxiliary port LB _ TRX and the common ends of the second duplexers 2117 in a one-to-one correspondence, and a second end of the second switch unit 2115 is connected to the first antenna port LB _ ANT1. Two first ends of the third switching unit 2116 are respectively connected to the input ends of the first low noise amplifier 2112 and the second low noise amplifier 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 second duplexers 2117, the second auxiliary port LB _ RXIN, and the first auxiliary input ports LNA _ 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. 8 and 9, in one embodiment, the transceiver unit 211 further includes a coupler 2118. A coupler 2118 is disposed 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, reverse power information of the low frequency signal can be correspondingly detected.

With continued reference to fig. 8 and 9, 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 second 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 second filter. The second 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. 10, 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 duplexers in the transmitting module 220 is multiple. The number of the third duplexers may be the same as the number of the low frequency bands. Illustratively, the number of the third duplexers may be three, and the frequency bands of the low-frequency signals output by the three third duplexers are different, where the three third duplexers 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. Wherein the transceiver module 210 further comprises: a fourth switching unit 223 and a fifth switching unit 224. Wherein, the first end of fourth switch unit 223 with the output of second power amplifier 221 is connected, a plurality of second ends of fourth switch unit 223 respectively with a plurality of a first end one-to-one of third duplexer is connected, and is a plurality of another first end of third duplexer is respectively with a plurality of first auxiliary input port LNA _ AUX one-to-one is connected. The fourth switching unit 223 may selectively turn on a radio frequency path between the second power amplifier 221 and any duplexer. A plurality of first ends of the fifth switch unit 224 are respectively connected to the common ends of the plurality of third duplexers in a one-to-one correspondence manner, and a second end of the fifth switch unit 224 is connected to the second antenna ANT1. The fifth switching unit 224 may selectively turn on a radio frequency path between the second antenna ANT1 and any one of the duplexers. 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.

As shown in fig. 11, in one embodiment, the transmitting module 220 further includes a coupling unit 225 disposed on a radio frequency path between the first 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 coupling signal includes a forward coupling signal and a backward coupling signal, and forward power information of the low-frequency signal can be detected based on the forward coupling signal; based on the reverse coupling signal, reverse power information of the low frequency signal can be correspondingly detected.

As shown in fig. 12, in one embodiment, the low-frequency signal includes a plurality of radio-frequency signals in a low-frequency band, the number of the second auxiliary input ports is multiple, and the number of the second filtering units 312 is multiple. The number of the second filtering units 312 may be the same as the number of the frequency bands of the low frequency band, and the frequency bands of the low frequency signals output by the second filtering units 312 are different. Wherein the first receiving module 310 includes: a third low noise amplifier 311, a sixth switching unit 313, a seventh switching unit 314, and a plurality of second 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 second filtering units 312 in a one-to-one correspondence manner; second ends of the second 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 320 includes a fourth low noise amplifier 321, wherein an input end of the fourth low noise amplifier 321 is connected to a first end of the sixth switching unit 313, and an output end of the fourth low noise amplifier 321 is connected to the rf transceiver 100.

The filtering module 330 includes a plurality of third filtering units 331 and eighth switching units 322, where the number of the third filtering units 331 may be the same as the number of frequency bands of the low frequency band. The frequency bands of the radio frequency signals output by the plurality of third filtering units 331 included in the filtering module 330 are different. First ends of the plurality of third filtering units 331 are respectively connected to a plurality of second ends of the sixth switching unit 313 in a one-to-one correspondence manner, second ends of the plurality of third filtering units 331 are respectively connected to a plurality of first ends of the eighth switching unit 322 in a one-to-one correspondence manner, and a second end of the eighth switching unit 322 is connected to the fourth antenna ANT 3. In the embodiment of the present application, the plurality of third 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 third filtering unit 331 for outputting the N28A band may be external to the receiving circuit 300, and the second filtering unit 312 for outputting the radio frequency signals of other bands may be internal to the receiving circuit 300. In the embodiment of the present application, the setting positions of the plurality of third filtering units 331 are not limited.

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

A first reception path: the third antenna ANT2 receives the N28A band signal from the space, and then the N28A band signal enters the receiving circuit 300 through the third antenna port LB _ ANT2 of the receiving circuit 300, enters the second filtering unit 312 through the seventh switching unit 314 inside to filter out-of-band noise of the low frequency signal, and then enters the third low noise amplifier 311 through the sixth switching unit 312 to amplify the reception, and finally enters the radio frequency transceiver 100.

A second reception path: the fourth antenna ANT3 receives the N28A band signal from the space, and then the N28A band signal enters the third 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 LNA IN AUX, and enters the fourth low noise amplifier 321 through the sixth switching unit 312 to amplify the reception, and finally enters the radio frequency transceiver 100.

As shown in fig. 13, 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.

In one embodiment, the antenna efficiency of each of the first antenna ANT0 and the third antenna ANT2 is higher than the antenna efficiency of each of the second antenna ANT1 and the fourth antenna ANT 3. 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. 14, the first antenna ANT0 and the third antenna ANT2 are generally disposed on the top border 101 and the bottom border 103 of the communication device, respectively, and the second antenna ANT1 and the fourth antenna ANT3 are disposed on the two

side borders

102 and 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.

As shown in fig. 15, in one embodiment, the radio frequency system further comprises a first amplification module 400. The first amplification module 400 may be disposed on a receiving path between the first auxiliary input port LNA _ AUX and the second antenna ANT1, and configured to amplify the received low-frequency signal. Specifically, an input end of the first amplifying module 400 is connected to the first filtering unit 222, and an output end of the first amplifying module is connected to the first auxiliary input port LNA _ AUX. Specifically, the first amplifying module 400 may include a fifth low noise amplifier, an input terminal of the fifth low noise amplifier is used as the input terminal of the first amplifying module 400, and an output terminal of the fifth low noise amplifier is used as the output terminal of the first amplifying module 400.

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

a second sub-reception path: the N28A band signal in the space received by the second antenna ANT1, the N28A band received signal enters the transmitting module 220, and is output to the filtering unit 222 through the fifth switch unit 224 for filtering, the filtered N28A band signal is amplified by the first amplifying module 400 and then output to the first auxiliary input port LNA _ AUX, and enters the second low noise amplifier 2113 of the transceiving unit 211 for secondary amplification of the N28A band received signal, 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 details are not repeated here.

In this embodiment, by providing the first amplifying module 400 between the first auxiliary input port LNA _ AUX and the second antenna ANT1, it can be understood that a two-stage low noise amplifier is provided in the second sub-receiving path, so as to improve the signal strength of the low frequency signal received by the second sub-receiving path, further avoid the occurrence of the situation that the receiving performance of the low frequency signal in the second sub-receiving path is affected by the low efficiency of the second antenna ANT1 and the insertion loss far away from the second low noise amplifier 2113, and improve the receiving performance of the low frequency signal in the second sub-receiving path.

As shown in fig. 16, in one embodiment, the rf system further includes a second amplification module 500. The second amplifying module 500 is disposed on a radio frequency path between the fourth antenna ANT3 and the second auxiliary input port LAN IN AUX, and configured to amplify the received low-frequency signal. Specifically, an input end of the second amplifying module 500 is connected to the filtering module 330, and an output end of the second amplifying module 500 is connected to the second auxiliary input port LAN IN AUX. Specifically, the second low noise amplifier 2113 module may include a sixth low noise amplifier, an input end of the sixth low noise amplifier serves as the input end of the second amplification module 500, and an output end of the sixth low noise amplifier serves as the output end of the second amplification module 500.

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

a second reception path: the fourth antenna ANT3 receives the N28A band signal from the space, and then the N28A band signal enters the filtering module 330 to filter out-of-band noise of the low frequency signal, and then the second amplifying module 500 amplifies the received N28A band signal, and then the signal enters the receiving circuit 300 through the second auxiliary input port LNA IN AUX, and enters the fourth low noise amplifier 321 through the sixth switching unit 312 to perform secondary amplification on the received N28A band signal, and finally enters the radio frequency transceiver 100.

IN the embodiment of the present application, by providing the second amplifying module 500 between the second auxiliary input port LAN IN AUX and the fourth antenna ANT3, it can be understood that a two-stage low noise amplifier is 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, and further, the situation that the efficiency of the fourth antenna ANT3 is low and the insertion loss is large and the receiving performance of the low frequency signal IN the second receiving path is affected by being far away from the fourth low noise amplifier 321 can be avoided, and the receiving performance of the low frequency signal IN the second 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 x 4MIMO 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 4 x 4MIMO receiving mode is adopted, 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 the rf system of any of the previous embodiments.

In the description herein, reference to the description of "one of the embodiments," "optionally," etc., 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;

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

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

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 a first receive module and a second receive module;

the first receiving module is configured with the first receiving path connected to the rf transceiver and a second antenna port, respectively, and the first receiving path is configured to filter, amplify and transmit a low-frequency signal transmitted through the second antenna port to the rf transceiver, so as to receive the low-frequency signal;

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

2. The radio frequency system of claim 1, 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 rf transceiver and the first antenna, respectively, 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 a second sub-receive path for supporting receive processing of the low-frequency signal;

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

3. The radio frequency system according to claim 2, wherein the transceiver module comprises a transceiver unit and a first duplexer, the transceiver unit being configured with a first input port, a first output port, a second output port for connection with the radio frequency transceiver, a first antenna port for connection with the first antenna, and a first auxiliary input port for connection with the transmit module; wherein the transceiver unit comprises a first power amplifier, a first low noise amplifier, a second low noise amplifier, wherein,

the first power amplifier 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 duplexer for filtering, and transmitting the filtered low-frequency signal to the first antenna port to realize transmission processing of the low-frequency signal;

the first antenna port outputs the received low-frequency signal to the first duplexer for filtering, the low-frequency signal after filtering is transmitted to the first low-noise amplifier for low-noise amplification, and the low-frequency signal after low-noise amplification is transmitted to the first output port, so as to receive the low-frequency signal;

the first auxiliary input port outputs the low-frequency signal after filtering to the second low-noise amplifier 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.

4. The radio frequency system according to claim 3, wherein the input terminal of the first power amplifier is connected to the first input port, and the output terminal of the first power amplifier is connected to a first terminal of the first duplexer; the input end of the first low noise amplifier is connected with the other first end of the first duplexer, and the output end of the first low noise amplifier is connected with the first output port;

the input end of the second low-noise amplifier is connected with the first auxiliary input port, and the output end of the second low-noise amplifier is connected with the second output port; the common end of the first duplexer is connected with the first antenna port.

5. The rf system according to claim 4, wherein the low frequency signal includes a plurality of low frequency band rf signals, the number of the first auxiliary input ports is plural, the number of the first duplexers is plural, and the frequency bands of the rf signals output by the first duplexers are different, wherein the transceiver unit further includes:

a first end of the first switch unit is connected with the output end of the first power amplifier, and a plurality of second ends of the first switch unit are respectively connected with a first end of the first duplexers in a one-to-one correspondence manner;

a plurality of first ends of the second switch unit are respectively connected with the common ends of the plurality of first duplexers in a one-to-one correspondence manner, and a second end of the second switch unit is connected with the first antenna port;

and two first ends of the third switching unit are respectively connected with the input ends of the first low noise amplifier and the second low noise amplifier in a one-to-one correspondence manner, and a plurality of second ends of the third switching unit are respectively connected with the other first ends of the first duplexers and the first auxiliary input ports in a one-to-one correspondence manner.

6. The radio frequency system according to claim 3, wherein the transceiver unit is further configured with a first auxiliary port, a second auxiliary port, and a third auxiliary port, wherein an input of the first power amplifier is connected to the first input port, and an output of the first power amplifier is connected to the first auxiliary port;

the input end of the first low noise amplifier is connected with the second auxiliary port, and the output end of the first low noise amplifier is connected with the first output port;

the input end of the second low noise amplifier is connected with the first auxiliary input port, and the output end of the second low noise amplifier is connected with the second output port;

a first end of the first duplexer is connected to the first auxiliary port, another first end of the first duplexer is connected to the second auxiliary port, and a common end of the first duplexer is connected to the first antenna port via the third auxiliary port.

7. The rf system according to claim 6, wherein the low frequency signal includes a plurality of low frequency bands of rf signals, the number of the first auxiliary input ports is plural, and wherein the transceiver unit further includes:

a plurality of second duplexers for filtering stray waves other than the low-frequency signal, wherein the frequency bands of the radio-frequency signals output by the second duplexers and the first duplexers are different;

a first end of the first switch unit is connected with an output end of the first power amplifier, and a plurality of second ends of the first switch unit are respectively connected with the first auxiliary port and a first end of the plurality of second duplexers in a one-to-one correspondence manner;

a plurality of first ends of the second switch unit are respectively connected with the third auxiliary port and the common ends of the second duplexers in a one-to-one correspondence manner;

and two first ends of the third switching unit are respectively connected with the input ends of the first low noise amplifier and the second low noise amplifier in a one-to-one correspondence manner, and a plurality of second ends of the third switching unit are respectively connected with the other first ends of the plurality of second duplexers and the plurality of first auxiliary input ports in a one-to-one correspondence manner.

8. The radio frequency system of claim 2, wherein the transmission module comprises:

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

the first filter unit, two first ends of the first filter unit respectively with the output of second power amplifier, first auxiliary port are connected, the second end of the first filter unit with the second antenna is connected, wherein, the first filter unit is used for carrying out filtering processing to the low frequency signal that second power amplifier output and export to the second antenna, the first filter unit is to the low frequency signal that the second antenna received carry out filtering processing after export to first auxiliary port.

9. The rf system according to claim 8, wherein the low-frequency signals include a plurality of low-frequency band rf signals, the first filtering unit includes a plurality of third duplexers, and the number of the third duplexers and the number of the first auxiliary input ports are plural, respectively, wherein the transceiver module further includes:

a first end of the fourth switch unit is connected with the output end of the second power amplifier, a plurality of second ends of the fourth switch unit are respectively connected with a first end of the plurality of third duplexers in a one-to-one correspondence manner, and another first end of the plurality of third duplexers is respectively connected with a plurality of first auxiliary input ports in a one-to-one correspondence manner;

and a plurality of first ends of the fifth switch unit are respectively connected with the public ends of the third duplexers in a one-to-one correspondence manner, and a second end of the fifth switch unit is connected with the second antenna.

10. The radio frequency system of claim 3, wherein the second antenna has a lower efficiency than the first antenna, wherein the radio frequency system further comprises:

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 auxiliary input port and used for amplifying the received low-frequency signal.

11. The radio frequency system according to claim 1, wherein the first receiving module comprises: the second antenna port is connected with the input end of the third low noise amplifier through a second filtering unit, and the output end of the third low noise amplifier is connected with the radio frequency transceiver;

the second receiving module comprises a fourth low noise amplifier, wherein an input end of the fourth low noise amplifier is connected with the second auxiliary input port, and an output end of the fourth low noise amplifier is connected with the radio frequency transceiver.

12. The RF system of claim 1, wherein the low frequency signal includes a plurality of low frequency band RF signals, and the number of the second auxiliary input ports is plural, wherein,

the first receiving module includes: a third low noise amplifier, a sixth switching unit, a seventh switching unit, and a plurality of second filtering units, wherein,

the input end of the third low noise amplifier is connected with a first end of the sixth switching unit, and the output end of the third low noise amplifier is connected with the radio frequency transceiver; a plurality of second ends of the sixth switch unit are respectively connected with a plurality of second auxiliary input ports and a plurality of first ends of the second filter units in a one-to-one correspondence manner; second ends of the second filtering units are respectively connected with the first ends of the seventh switching unit in a one-to-one correspondence manner, and the second end of the seventh switching unit is connected with the second antenna port;

the second receiving module comprises a fourth low noise amplifier, wherein an input end of the fourth low noise amplifier is connected with a first end of the sixth switching unit.

13. The radio frequency system of claim 12, wherein an efficiency of the fourth antenna is lower than an efficiency of the third antenna, wherein the radio frequency system further comprises:

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.

14. A communication device, characterized in that it comprises a radio frequency system as claimed in any one of claims 1 to 13.