CN111193526B

CN111193526B - Radio frequency system and electronic equipment

Info

Publication number: CN111193526B
Application number: CN202010038966.XA
Authority: CN
Inventors: 陈宪龙
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-01-14
Filing date: 2020-01-14
Publication date: 2021-11-05
Anticipated expiration: 2040-01-14
Also published as: CN111193526A

Abstract

The embodiment of the application discloses a radio frequency system and electronic equipment, wherein the radio frequency system comprises a radio frequency transceiver, a radio frequency processing circuit, a change-over switch module, a first antenna, a second antenna, a third antenna and a fourth antenna, and the radio frequency transceiver is connected with the radio frequency processing circuit; the radio frequency processing circuit comprises a first transmitting module, a second transmitting module, a first receiving module, a second receiving module, a first duplexer, a second duplexer and a first filter; when the radio frequency system works in a non-independent networking mode, the first antenna is used for transmitting of a first low-frequency band and receiving of a main set of the first low-frequency band, the second antenna is used for transmitting of a second low-frequency band and receiving of the main set of the second low-frequency band, the third antenna is used for diversity reception of the second low-frequency band, the fourth antenna is used for diversity reception of the first low-frequency band, and the first filter is used for filtering frequency bands outside the first low-frequency band. The embodiment of the application can ensure the reliability of the uplink signal.

Description

Radio frequency system and electronic equipment

Technical Field

The application relates to the technical field of mobile terminals, in particular to a radio frequency system and electronic equipment.

Background

With the widespread use of a large number of electronic devices such as smart phones, smart phones have more and more applications and more powerful functions, and smart phones are developed towards diversification and personalization directions and become indispensable electronic products in user life. Electronic devices in the 4th Generation (4G) mobile communication system generally adopt a single-antenna or dual-antenna rf system architecture. The radio frequency framework of the 4G scheme is simple and comprises a transmitting device, a receiving device, a switch and an antenna. The transmitting device may include a Low Band (LB) transmitting module and a Medium High Band (MHB) transmitting module, and the receiving device may include a Primary Receive (PRX) module and a Diversity Receive (DRX) module. The receiving paths among the main set receiving module, the change-over switch and the antenna are main set receiving paths, and the receiving paths among the diversity receiving module, the change-over switch and the antenna are diversity receiving paths. The switch can intelligently switch between the main set receiving path and the diversity receiving path. The current 4G radio frequency framework can only realize the transmission and the reception of a single low-frequency band.

Disclosure of Invention

The embodiment of the application provides a radio frequency system and electronic equipment, and the 4 antennas are adopted to support double connection of a first low-frequency band and a second low-frequency band, so that uplink signals can be distributed on 2 antennas with better antenna efficiency, and the reliability of the uplink signals can be ensured.

In a first aspect, an embodiment of the present application provides a radio frequency system, including a radio frequency transceiver, a radio frequency processing circuit, a switch module, a first antenna, a second antenna, a third antenna, and a fourth antenna, where the radio frequency transceiver is connected to the radio frequency processing circuit;

the radio frequency processing circuit comprises a first transmitting module, a second transmitting module, a first receiving module, a second receiving module, a first duplexer, a second duplexer and a first filter;

the first transmitting module is connected with the first antenna through the first duplexer and the switch module, the second transmitting module is connected with the second antenna through the switch module, the first receiving port of the first receiving module is connected with the first antenna through the first duplexer and the switch module, the second receiving port of the first receiving module is connected with the second antenna through the second duplexer, the second transmitting module and the switch module, the third receiving port of the first receiving module is connected with the second antenna through the second transmitting module and the switch module, the first receiving port of the second receiving module is connected with the second antenna through the switch module, and the second receiving port of the second receiving module is connected with the fourth antenna through the first filter, the second receiving module is connected with the third antenna through the change-over switch module or the filter module; the antenna efficiency of the first antenna and the second antenna is higher than the antenna efficiency of the third antenna and the fourth antenna;

the radio frequency system works in a non-independent networking mode, the first antenna is used for transmitting a first low-frequency band and receiving a main set of the first low-frequency band, the second antenna is used for transmitting a second low-frequency band and receiving a main set of the second low-frequency band, the third antenna is used for diversity reception of the second low-frequency band, the fourth antenna is used for diversity reception of the first low-frequency band, and the first filter is used for filtering frequency bands outside the first low-frequency band.

In a second aspect, an embodiment of the present application provides an electronic device, including the radio frequency system of any one of the first aspects, where the radio frequency system is configured to implement transmission and reception in a first low frequency band and transmission and reception in a second low frequency band when the radio frequency system operates in a non-independent networking mode.

It can be seen that, in the embodiment of the present application, 4 antennas are used to support dual connection between the first low frequency band and the second low frequency band, so that simultaneous transmission and reception of the first low frequency band and the second low frequency band can be realized, uplink signals can be distributed on 2 antennas with better antenna efficiency, and reliability of the uplink signals can be ensured.

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 structural diagram of a radio frequency system disclosed in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a filter module according to an embodiment of the present disclosure;

fig. 3a is a schematic structural diagram of a radio frequency system in which a switch module includes a DP3T switch or a DP4T switch according to an embodiment of the present disclosure;

fig. 3b is a schematic structural diagram of a radio frequency system in which a switch module includes a 3P3T switch according to an embodiment of the present disclosure;

fig. 4a is a schematic structural diagram of a radio frequency system in which a switch module includes two switches according to an embodiment of the present disclosure;

fig. 4b is a schematic structural diagram of another radio frequency system in which the switch module includes two switches according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without inventive step, are within the scope of the present disclosure.

The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, system, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The electronic device according to the embodiments of the present application may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, which have wireless communication functions, and various forms of User Equipment (UE) (e.g., Mobile phones), Mobile Stations (MSs), terminal devices (terminal devices), and so on. For convenience of description, the above-mentioned devices are collectively referred to as electronic devices.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a radio frequency system disclosed in the embodiment of the present application, the radio frequency system 100 includes a radio frequency transceiver 11, a radio frequency processing circuit 12, a switch module 13, a first antenna 141, a second antenna 142, a third antenna 142, and a fourth antenna 144, the radio frequency transceiver 11 is connected to the radio frequency processing circuit 12;

the rf processing circuit 12 includes a first transmitting module 121, a second transmitting module 122, a first receiving module 123, a second receiving module 124, a first duplexer 151, a second duplexer 152, and a first filter 161;

the first transmitting module 121 is connected to the first antenna 141 through the first duplexer 151 and the switch module 13, the second transmitting module 122 is connected to the second antenna 142 through the switch module 13, the first receiving port 1231 of the first receiving module 123 is connected to the first antenna 141 through the first duplexer 151 and the switch module 13, the second receiving port 1232 of the first receiving module 123 is connected to the second antenna 142 through the second duplexer 152, the second transmitting module 122 and the switch module 13, the third receiving port 1233 of the first receiving module 123 is connected to the second antenna 142 through the second transmitting module 122 and the switch module 13, and the first receiving port 1241 of the second receiving module 124 is connected to the second antenna 142 through the switch module 13, the second receiving port 1242 of the second receiving module 124 is connected to the fourth antenna 144 through the first filter 161, and the second receiving module 124 is connected to the third antenna 143 through the switch module 13 or the filter module 17; the antenna efficiency of the first antenna 141 and the second antenna 142 is higher than that of the third antenna 143 and the fourth antenna 144;

when the rf system 100 operates in a non-independent networking mode, the first antenna 141 is used for transmitting the first low frequency band and receiving the main set of the first low frequency band, the second antenna 142 is used for transmitting the second low frequency band and receiving the main set of the second low frequency band, the third antenna 143 is used for diversity reception of the second low frequency band, the fourth antenna 144 is used for diversity reception of the first low frequency band, and the first filter 161 is used for filtering out the frequency bands other than the first low frequency band. That is, the first filter 161 may reserve the first low frequency band and filter other frequency bands.

In the embodiment of the present application, the non-Standalone Networking (NSA) mode includes any one of EN-DC, NE-DC, and NGEN-DC frameworks.

Under an EN-DC framework, the electronic equipment is connected with a 4G core network, a 4G base station is a main station, and a 5G base station is an auxiliary station;

under an NE-DC framework, a 5G core network is introduced, a 5G base station is a main station, and a 4G base station is an auxiliary station;

under the NGEN-DC framework, a 5G core network is introduced, a 4G base station is a main station, and a 5G base station is an auxiliary station.

Wherein DC represents Dual Connectivity, i.e., Dual Connectivity (DC); e represents Evolved-UMTS Terrestrial Radio Access (E-UTRA or EUTRA), namely a 4G Radio Access network; n represents (new radio, NR), i.e., 5G new radio; NG stands for (next generation, NG) next generation core network, i.e. 5G core network.

EN-DC refers to dual connectivity of a 4G radio access network with a 5G NR, NE-DC refers to dual connectivity of a 5G NR with a 4G radio access network, and NGEN-DC refers to dual connectivity of a 4G radio access network with a 5G NR under a 5G core network.

For convenience of explanation, the following non-independent networking mode is described by taking an EN-DC architecture as an example.

Under an EN-DC framework, the radio frequency system of the embodiment of the present application supports low frequency (low band LB) + LB NSA, where LB + LB NSA refers to that LB Long Term Evolution (LTE) + LB NR jointly operates, two Power Amplifiers (PA) are required to simultaneously operate to transmit signals, and LB LTE and NR both require two antennas, one antenna is used for transmitting (transmit, TX) or Primary Receiver (PRX), and the other antenna is used for receiving Diversity (DRX). Therefore, to implement LB + LB NSA, 4 antennas are required. Because the size of the LB antenna is too large, for small-sized electronic devices (e.g., mobile phones), the headroom reserved for the LB antenna is small, and it is difficult to simultaneously meet the requirements of the headroom of 4 LB antennas, so that it is difficult to make an LB antenna with good efficiency for 4 antennas, and in order to ensure the reliability of uplink signals. Two antennas with better antenna efficiency in 4 antennas can be used for transmitting the LB LTE signal and the LB NR signal.

In the embodiment of the present application, the first low frequency band may include a 4G band, for example, a B20 band (uplink: 832-. It should be noted that the band ranges of B8 of the 4G band and N8 of the 5G band are the same, and the band ranges of B28 of the 4G band and N28 of the 5G band are the same.

Under the EN-DC architecture, the first antenna 141 is used for transmission of the first low frequency band and main set reception of the first low frequency band, the second antenna 142 is used for transmission of the second low frequency band and main set reception of the second low frequency band, the third antenna 143 is used for diversity reception of the second low frequency band, and the fourth antenna 144 is used for diversity reception of the first low frequency band. For example, the first antenna 141 is used for transmission and main set reception of B20 frequency band, the second antenna 142 is used for transmission and main set reception of N8 or N28 frequency band, the third antenna 143 is used for diversity reception of N8 or N28 frequency band, and the fourth antenna 144 is used for diversity reception of B20 frequency band.

In an embodiment of the present application, a Transmission (TX) path of a first low frequency band includes: the radio frequency transceiver 11 → the first transmitting module 121 → the first duplexer 151 → the switch module 13 → the first antenna 141;

a primary set reception (PRX) path of the first low frequency band comprising: the first antenna 141 → the switch module 13 → the first duplexer 151 → the first receiving module 123 → the rf transceiver 11;

a Diversity Reception (DRX) path of the first low frequency band includes: the fourth antenna 144 → the first filter 161 → the second receiving module 124 → the radio frequency transceiver 11;

a Transmit (TX) path of the second low frequency band includes: the radio frequency transceiver 11 → the second transmitting module 122 → the second duplexer 152 → the second transmitting module 122 → the switch module 13 → the second antenna 142; or, the rf transceiver 11 → the second transmitting module 122 → the switch module 13 → the second antenna 142;

a primary set reception (PRX) path of the second low frequency band comprising: the second antenna 142 → the switch module 13 → the second transmitting module 122 → the second duplexer 152 → the first receiving module 123 → the rf transceiver 11; or, the second antenna 142 → the switch module 13 → the second transmitting module 122 → the first receiving module 123 → the rf transceiver 11;

a Diversity Receive (DRX) path of the second low frequency band comprising: the third antenna 143 → the switch module 13 → the second receiving module 124 → the rf transceiver 11; or, the third antenna 143 → the filter module 17 → the second receiving module 124 → the radio frequency transceiver 11.

Wherein the radio frequency path of the first low frequency band comprises: a transmission path of the first low frequency band, a main set receiving path of the first low frequency band, and a diversity receiving path of the first low frequency band. The radio frequency path of the second low frequency band includes: a transmission path of the second low frequency band, a main set receiving path of the second low frequency band, and a diversity receiving path of the second low frequency band.

The radio frequency path of the first low frequency band (e.g., LB LTE band) requires only TX (transmit signal), PRX (primary set receive signal), DRX (diversity receive signal). The radio frequency path of the second low frequency band (LB NR band) requires TX (transmit signal), PRX (primary set receive signal), DRX (diversity receive signal), Multiple-Input Multiple-output (MIMO) PRX, and MIMO DRX signals.

In the embodiment of the present application, the first duplexer 151 may allow the transmission of the first low frequency band and the reception of the main set of the first low frequency band to operate simultaneously. The second duplexer 152 may allow simultaneous operation of the transmission of the second low frequency band and the reception of the main set of the second low frequency band.

The rf transceiver 11 of the embodiment of the present application may include a Wafer Transceiver (WTR). The first transmitting module 121 may include a Multi-mode Multi-band Power Amplifier (MMPA), and the MMPA may integrate a PA and a switch therein. The MMPA in the embodiment of the application can improve the LTE transmitting power under NSA.

The second transmitting module 122 of the embodiment of the present application may include PAMID, which is a radio frequency integrated module integrating PA, duplexer, filter and switch.

The first receiving module 123 in the embodiment of the present application may include a Micro Low Noise Amplifier (MLNA), and the MLNA may integrate a Low Noise Amplifier (LNA) therein, so as to realize amplification of RX signals.

PAMID and MLNA in the embodiments of the present application can be replaced with phase7 lite devices, and also replaced with NR-supporting MMPA. The embodiments of the present application are not limited.

The second receiving module 124 in this embodiment of the application may include an L-DRX, which is a receiving module integrating a Surface Acoustic Wave (SAW) filter and an LNA, and is used to filter and amplify an RX signal.

The L-DRX in the embodiment of the application can be replaced by a phase7 lite device, a DFEM + MLNA scheme or a switch + SAW + MLNA scheme. The embodiments of the present application are not limited.

The change-over switch module 13 of the embodiment of the present application may include at least one of a DPDT switch, a 3P3T switch, a DP4T switch, and an SPDT switch. Wherein, the DPDT switch, the 3P3T switch, the DP4T switch and the SPDT switch are all fully connected switches.

The DPDT switch may include 2 In ports and 2 OUT ports, and 2-2 cross-connect switching may be implemented by In-OUT; the 3P3T switch can comprise 3 In ports and 3 OUT ports, and 3-3 arbitrary connection switching can be realized by In-OUT; the DP4T switch can comprise 4 In ports and 2 OUT ports, and 2-2 line connection switching can be realized through In-OUT; the SPDT switch may include 1 In port and 2 OUT ports, and 1 port may be connected In-OUT.

In the embodiment of the application, 4 antennas are adopted to support the dual connection of the first low-frequency band and the second low-frequency band, so that the simultaneous transmission and reception of the first low-frequency band and the second low-frequency band can be realized, uplink signals can be distributed on 2 antennas with better antenna efficiency, and the reliability of the uplink signals can be ensured.

Wherein the second low frequency band comprises the first sub-band or the second sub-band.

The frequency range of the first low-frequency band is different from that of the second low-frequency band. For example, the first low frequency band is a B20 band (upper link: 832 + 862MHz, lower link: 791 + 821MHz), the first sub-band is a N8 band (upper link: 880 + 915MHz, lower link: 925 + 960MHz) or a B8 band, and the second sub-band is a N28 band (upper link: 703 + 748MHz, lower link: 758 + 803MHz) or a B28 band.

Specifically, in the non-independent networking mode, the first low frequency band is a B20 frequency band, the first sub-band is an N8 frequency band, and the second sub-band is an N28 frequency band. In the 4G mode, the first low frequency band is a B20 band, the first sub-band is a B8 band, and the second sub-band is a B28 band.

Optionally, in an embodiment, when the radio frequency system 100 operates in the 4G mode, the first antenna 141 is used for transmitting in the first low frequency band and receiving in the main set of the first low frequency band, the first antenna 141 is also used for transmitting in the second low frequency band and receiving in the main set of the second low frequency band, and the second antenna 142 is used for diversity reception in the first low frequency band or the second low frequency band.

When the radio frequency system 100 operates in the 4G mode, the third antenna 143 and the fourth antenna 144 in the radio frequency system 100 in the embodiment of the present application are not implemented or implemented only as low frequency (LB) Reception (RX), so as to implement a 4RX/4 × 4MIMO function.

In an embodiment of the present application, a Transmission (TX) path of a first low frequency band includes: the radio frequency transceiver 11 → the second transmitting module 122 → the switch module 13 → the first antenna 141;

a primary set reception (PRX) path of the first low frequency band comprising: the first antenna 141 → the switch module 13 → the second transmitting module 122 → the first receiving module 123 → the rf transceiver 11;

a Diversity Reception (DRX) path of the first low frequency band includes: the second antenna 142 → the switch module 13 → the second receiving module 124 → the rf transceiver 11;

a Transmit (TX) path of the second low frequency band includes: the radio frequency transceiver 11 → the second transmitting module 122 → the second duplexer 152 → the second transmitting module 122 → the switch module 13 → the first antenna 141; or, the rf transceiver 11 → the second transmitting module 122 → the switch module 13 → the first antenna 141;

a primary set reception (PRX) path of the second low frequency band comprising: the first antenna 141 → the switch module 13 → the second transmitting module 122 → the second duplexer 152 → the first receiving module 123 → the rf transceiver 11; or, the first antenna 141 → the switch module 13 → the second transmitting module 122 → the first receiving module 123 → the rf transceiver 11;

a Diversity Receive (DRX) path of the second low frequency band comprising: the second antenna 142 → the switch module 13 → the second receiving module 124 → the rf transceiver 11.

The switch module 13 may include one switch or two switches.

Optionally, in the case that the switch module 13 includes a switch, the switch includes one of a double-pole triple-throw DP3T switch, a 3P3T switch, or a DP4T switch.

Optionally, in a case that the switch 13 includes a DP3T switch or a DP4T switch, the rf processing circuit 12 further includes a filter module 17, and the second receiving module 124 is connected to the third antenna 143 through the switch module 13 or the filter module 17, including:

the third receiving port of the second receiving module 124 is connected to the third antenna 143 through the filter module 17.

Optionally, please refer to fig. 2, and fig. 2 is a schematic structural diagram of a filter module according to an embodiment of the present disclosure. As shown in fig. 2, the filter module 17 includes a second filter 171, a third filter 172, a first SPDT switch 173 and a second SPDT switch 174, the P port of the first SPDT switch 173 is connected to the third receiving port 1243 of the second receiving module 124, the first T port of the first SPDT switch 173 is connected to the first end of the second filter 171, the second T port of the first SPDT switch 173 is connected to the first end of the third filter 172, the second end of the second filter 171 is connected to the first T port of the second SPDT switch 174, the second end of the third filter 172 is connected to the second T port of the second SPDT switch 174, and the P port of the second SPDT switch 174 is connected to the third antenna 143;

the second filter 171 is configured to filter out a frequency band outside the first frequency sub-band, and the third filter 172 is configured to filter out a frequency band outside the second frequency sub-band.

Referring to fig. 3a, fig. 3a is a schematic structural diagram of a radio frequency system in which a switch module includes a DP3T switch or a DP4T switch according to an embodiment of the present disclosure, as shown in fig. 3 a. The radio frequency system 100 comprises a radio frequency transceiver 11, a radio frequency processing circuit 12, a DP3T switch 13, a first antenna 141, a second antenna 142, a third antenna 142, a fourth antenna 144 and a directional coupler 18, wherein the radio frequency transceiver 11 is connected with the radio frequency processing circuit 12;

the rf processing circuit 12 includes a first transmitting module 121, a second transmitting module 122, a first receiving module 123, a second receiving module 124, a first duplexer 151, a second duplexer 152, a first filter 161, and a filter module 17;

the first transmitting module 121 is connected to the first antenna 141 through the first duplexer 151, the directional coupler 18 and the DP3T switch 13, the second transmitting module 122 is connected to the second antenna 142 through the DP3T switch 13, the first receiving port 1231 of the first receiving module 123 is connected to the first antenna 141 through the first duplexer 151, the directional coupler 18 and the DP3T switch 13, the second receiving port 1232 of the first receiving module 123 is connected to the second antenna 142 through the first duplexer 152, the second transmitting module 122 and the DP3T switch 13, the third receiving port 1233 of the first receiving module 123 is connected to the second antenna 142 through the second transmitting module 122 and the DP3T switch 13, the first receiving port 1241 of the second receiving module 124 is connected to the second antenna 142 through the DP3T switch 13, the second receiving port 1242 of the second receiving module 124 is connected to the fourth antenna 144 through the first filter 161, and the second receiving module 124 is connected to the third antenna 143 through the filter module 17; the antenna efficiency of the first antenna 141 and the second antenna 142 is higher than that of the third antenna 143 and the fourth antenna 144;

The filter module 17 includes a second filter 171, a third filter 172, a first SPDT switch 173 and a second SPDT switch 174, the P port of the first SPDT switch 173 is connected to the third receiving port of the second receiving module 124, the first T port of the first SPDT switch 173 is connected to the first end of the second filter 171, the second T port of the first SPDT switch 173 is connected to the first end of the third filter 172, the second end of the second filter 171 is connected to the first T port of the second SPDT switch 174, the second end of the third filter 172 is connected to the second T port of the second SPDT switch 174, and the P port of the second SPDT switch 174 is connected to the third antenna 143;

the second filter 171 is configured to filter out a frequency band outside the first frequency sub-band, and the third filter 172 is configured to filter out a frequency band outside the second frequency sub-band. That is, the second filter 171 reserves the first sub-band and filters out other bands except the first sub-band; the third filter 172 reserves the second sub-band and filters out other bands other than the second sub-band.

In the non-independent networking mode, the radio frequency system 100 will be described by taking the first low frequency band as the B20 frequency band, the first sub-band as the N8 frequency band, and the second sub-band as the N28A frequency band as an example. The N28A frequency band is a component of the N28 frequency band, and the N28 frequency band may be divided into an N28A frequency band and an N28B frequency band.

The specific signal flows under B20+ N28A EN-DC are as follows:

b20 band Transmission (TX), rf transceiver 11 (e.g., WTR) → first transmit module 121 (e.g., MMPA) → first duplexer 151 (e.g., B20 duplexer) → directional coupler 18 → DP3T switch 13 → first antenna 141;

primary diversity reception (PRX) in the B20 band, first antenna 141 → DP3T switch 13 → directional coupler 18 → first duplexer (e.g., B20 duplexer) → first reception module 123 (e.g., MLNA) → radio transceiver 11 (e.g., WTR);

diversity Reception (DRX) of B20 band, fourth antenna 124 → first filter 161 (e.g., B20 SAW) → second receiving module 124 (e.g., L-DRX) → radio frequency transceiver 11 (e.g., WTR);

N28A band Transmission (TX), rf transceiver 11 (e.g., WTR) → second transmit module 122 (e.g., LB PAmid) → second duplexer 152 (e.g., N28A duplexer) → second transmit module 122 (e.g., LB PAmid) → DP3T switch 13 → second antenna 142;

N28A band primary diversity receive (PRX), second antenna 142 → DP3T switch 13 → second transmit module 122 (e.g., LB PAmid) → second duplexer 152 (e.g., N28A duplexer) → first receive module 123 (e.g., MLNA) → radio transceiver 11 (e.g., WTR);

N28A band Diversity Reception (DRX), third antenna 143 → second SPDT switch 174 → third filter 172 (e.g., N28 SAW) → first SPDT switch 173 → second reception module 124 (e.g., L-DRX) → radio transceiver 11 (e.g., WTR).

The specific signal flow under B20+ N8 EN-DC is as follows:

n8 band Transmission (TX), rf transceiver 11 (e.g., WTR) → second transmit module 122 (e.g., LB PAmid) → DP3T switch 13 → second antenna 142;

primary diversity receive (PRX) in N8 band, second antenna 142 → DP3T switch 13 → second transmit module 122 (e.g., LB PAmid) → first receive module 123 (e.g., MLNA) → rf transceiver 11 (e.g., WTR);

diversity Reception (DRX) of the N8 band, third antenna 143 → second SPDT switch 174 → second filter 171 (e.g., N8 SAW) → first SPDT switch 173 → second reception module 124 (e.g., L-DRX) → radio transceiver 11 (e.g., WTR).

The directional coupler 18 may mix the two rf signals and output the mixed rf signal. Optionally, the directional coupler 18 may also have a power distribution function, for dividing the power of the input signal into several paths to be fed back to the corresponding receiving port of the rf transceiver 11, so that the rf transceiver 11 can adjust the power of the rf signal transmitted by the rf transceiver 11.

In the 4G mode, the first low frequency band is a B20 band, the first sub-band is a B8 band, and the second sub-band is a B28A band. The B28A frequency band is a component of the B28 frequency band, and the B28 frequency band may be divided into a B28A frequency band and a B28B frequency band.

The signal flow when the rf system 100 operates in the 4G mode is as follows:

B28A band Transmission (TX), rf transceiver 11 (e.g., WTR) → second transmit module 122 (e.g., LB PAmid) → second duplexer 152 (e.g., B28A duplexer) → second transmit module 122 (e.g., LB PAmid) → DP3T switch 13 → first antenna 141;

B20/B8 band Transmission (TX), rf transceiver 11 (e.g., WTR) → second transmitting module 122 (e.g., LB PAmid) → DP3T switch 13 → first antenna 141;

primary diversity receive (PRX) in B28A band, first antenna 141 → DP3T switch 13 → second transmit module 122 (e.g., LB PAmid) → second duplexer 152 (e.g., B28A duplexer) → first receive module 123 (e.g., MLNA) → radio transceiver 11 (e.g., WTR);

primary diversity receive (PRX) in B20/B8 band, first antenna 141 → DP3T switch 13 → second transmit module 122 (e.g., LB PAmid) → first receive module 123 (e.g., MLNA) → radio transceiver 11 (e.g., WTR);

diversity Reception (DRX) of B8/B20/B28, second antenna 142 → DP3T switch 13 → second receiving module 124 (e.g., L-DRX) → radio transceiver 11 (e.g., WTR).

Optionally, if the switch includes a 3P3T switch, the second receiving module 124 is connected to the third antenna 143 through the switch module 13 or the filter module 17, including:

the first receiving port of the second receiving module 124 is connected to the third antenna 143 through the switch module 13.

Referring to fig. 3b, fig. 3b is a schematic structural diagram of a radio frequency system in which a switch module includes a 3P3T switch according to an embodiment of the present application, as shown in fig. 3 b. The radio frequency system 100 comprises a radio frequency transceiver 11, a radio frequency processing circuit 12, a 3P3T switch 13, a first antenna 141, a second antenna 142, a third antenna 142, a fourth antenna 144 and a directional coupler 18, wherein the radio frequency transceiver 11 is connected with the radio frequency processing circuit 12;

the first transmitting module 121 is connected to the first antenna 141 through the first duplexer 151, the directional coupler 18 and the 3P3T switch 13, the second transmitting module 122 is connected to the second antenna 142 through the 3P3T switch 13, the first receiving port 1231 of the first receiving module 123 is connected to the first antenna 141 through the first duplexer 151, the directional coupler 18 and the 3P3T switch 13, the second receiving port 1232 of the first receiving module 123 is connected to the second antenna 142 through the first duplexer 152, the second transmitting module 122 and the 3P3T switch 13, the third receiving port 1233 of the first receiving module 123 is connected to the second antenna 142 through the second transmitting module 122 and the 3P3T switch 12413, the first receiving port 1231 of the second receiving module 124 is connected to the second antenna 142 through the 3P3T switch 13, the second receiving port 1242 of the second receiving module 124 is connected to the fourth antenna 144 through the first filter 161, and the second receiving module 124 is connected to the third antenna 143 through the 3P3T switch 13; the antenna efficiency of the first antenna 141 and the second antenna 142 is higher than that of the third antenna 143 and the fourth antenna 144;

B20+ N28A EN-DC specific signal flow direction:

b20 band Transmission (TX), rf transceiver 11 (e.g., WTR) → first transmit module 121 (e.g., MMPA) → first duplexer 151 (e.g., B20 duplexer) → directional coupler 18 → 3P3T switch 13 → first antenna 141;

primary diversity reception (PRX) in B20 band, first antenna 141 → 3P3T switch 13 → directional coupler 18 → first duplexer (e.g., B20 duplexer) → first reception module 123 (e.g., MLNA) → radio frequency transceiver 11 (e.g., WTR);

N28A band Transmission (TX), rf transceiver 11 (e.g., WTR) → second transmit module 122 (e.g., LB PAmid) → second duplexer 152 (e.g., B28A duplexer) → second transmit module 122 (e.g., LB PAmid) → 3P3T switch 13 → second antenna 142;

a primary diversity receive (PRX) of the N28A band, a second antenna 142 → 3P3T switch 13 → a second transmit module 122 (e.g., LB PAmid) → a second duplexer 152 (e.g., B28A duplexer) → a first receive module 123 (e.g., MLNA) → a radio frequency transceiver 11 (e.g., WTR);

diversity Reception (DRX) of the N28A band, third antenna 143 → 3P3T switch 13 → second receiving module 124 (e.g., L-DRX) → radio transceiver 11 (e.g., WTR).

B20+ N8 EN-DC specific signal flow direction:

n8 band Transmission (TX), rf transceiver 11 (e.g., WTR) → second transmit module 122 (e.g., LB PAmid) → 3P3T switch 13 → second antenna 142;

primary diversity receive (PRX) in the N8 band, second antenna 142 → 3P3T switch 13 → second transmit module 122 (e.g., LB PAmid) → first receive module 123 (e.g., MLNA) → rf transceiver 11 (e.g., WTR);

diversity Reception (DRX) of the N8 band, third antenna 143 → 3P3T switch 13 → second receiving module 124 (e.g., L-DRX) → radio transceiver 11 (e.g., WTR).

The signal flow when the radio frequency system 100 operates in the 4G mode is shown in fig. 3a as the signal flow in the 4G mode, and is not described herein again.

Optionally, the switch module 13 includes two switches, which include a first double-pole double-throw DPDT switch 131 and a second DPDT switch 132.

Optionally, a first P port of the first DPDT switch 131 is connected to the first antenna 141, a second P port of the first DPDT switch 131 is connected to the third antenna 143, a first T port of the first DPDT switch 131 is connected to the first duplexer 151, a second T port of the first DPDT switch 131 is connected to a first P port of the second DPDT switch 132, a second P port of the second DPDT switch 132 is connected to the second antenna 142, a first T port of the second DPDT switch 132 is connected to the second transmitting module 122, and a second T port of the second DPDT switch 132 is connected to a first receiving port of the second receiving module 124;

the first transmitting module 121 is connected to the first antenna 141 through the first duplexer 151 and the switch module 13, and includes:

the first transmitting module 121 is connected to the first antenna 141 through the first duplexer 151 and the first DPDT switch 131;

the second transmitting module 122 is connected to the second antenna 142 through the switch module 13, and includes:

the second transmitting module 122 is connected to the second antenna 142 through the second DPDT switch 132;

the first receiving port of the first receiving module 123 is connected to the first antenna 141 through the first duplexer 151 and the switch module 13, and includes:

a first receiving port of the first receiving module 123 passes through the first duplexer 151 and the first DPDT switch 131, and the first antenna 141;

the second receiving port of the first receiving module 123 is connected to the second antenna 142 through the second duplexer, the second transmitting module 122 and the switch module 13, and includes:

a second receiving port of the first receiving module 123 is connected to the second antenna 142 through the second duplexer, the second transmitting module 122 and the second DPDT switch 132;

the third receiving port of the first receiving module 123 is connected to the second antenna 142 through the second transmitting module 122 and the switch module 13, and includes:

the third receiving port of the first receiving module 123 is connected to the second antenna 142 through the second transmitting module 122 and the second DPDT switch 132;

the first receiving port of the second receiving module 124 is connected to the second antenna 142 through the switch module 13, and includes:

the first receiving port of the second receiving module 124 is connected to the second antenna 142 through the second DPDT switch 132;

the second receiving module 124 is connected to the third antenna 143 through the switch module 13 or the filter module, and includes:

the first receiving port of the second receiving module 124 is connected to the third antenna 143 through the second DPDT switch 132 and the first DPDT switch 131.

Optionally, referring to fig. 4a, fig. 4a is a schematic structural diagram of a radio frequency system in which a switch module includes two switches according to an embodiment of the present application, as shown in fig. 4 a. The radio frequency system 100 includes a radio frequency transceiver 11, a radio frequency processing circuit 12, a first DPDT switch 131, a second DPDT switch 132, a first antenna 141, a second antenna 142, a third antenna 142, a fourth antenna 144, and a directional coupler 18, wherein the radio frequency transceiver 11 is connected to the radio frequency processing circuit 12;

the first transmitting module 121 is connected to the first antenna 141 through the first duplexer 151, the directional coupler 18 and the first DPDT switch 131, the second transmitting module 122 is connected to the second antenna 142 through the second DPDT switch 132, the first receiving port 1231 of the first receiving module 123 is connected to the first antenna 141 through the first duplexer 151, the directional coupler 18 and the first DPDT switch 131, the second receiving port 1232 of the first receiving module 123 is connected to the second antenna 142 through the first duplexer 152, the second transmitting module 122 and the second DPDT switch 132, the third receiving port 1233 of the first receiving module 123 is connected to the second antenna 142 through the second transmitting module 122 and the second DPDT switch 132, the first receiving port 1241 of the second receiving module 124 is connected to the second antenna 142 through the second DPDT switch 132, the second receiving port 1242 of the second receiving module 124 is connected to the fourth antenna 144 through the first filter 161; the antenna efficiency of the first antenna 141 and the second antenna 142 is higher than that of the third antenna 143 and the fourth antenna 144;

The specific signal flows under B20+ N28A EN-DC are as follows:

b20 band Transmission (TX), rf transceiver 11 (e.g., WTR) → first transmit module 121 (e.g., MMPA) → first duplexer 151 (e.g., B20 duplexer) → directional coupler 18 → first DPDT switch 131 → first antenna 141;

primary diversity reception (PRX) of B20 band, first antenna 141 → first DPDT switch 131 → directional coupler 18 → first duplexer (e.g., B20 duplexer) → first reception module 123 (e.g., MLNA) → radio transceiver 11 (e.g., WTR);

N28A band Transmission (TX), rf transceiver 11 (e.g., WTR) → second transmit module 122 (e.g., LB PAmid) → second duplexer 152 (e.g., N28A duplexer) → second transmit module 122 (e.g., LB PAmid) → second DPDT switch 132 → second antenna 142;

primary diversity receive (PRX) in the N28A band, second antenna 142 → second DPDT switch 132 → second transmit module 122 (e.g., LB PAmid) → second duplexer 152 (e.g., N28A duplexer) → first receive module 123 (e.g., MLNA) → radio transceiver 11 (e.g., WTR);

diversity Reception (DRX) of the N28A band, the third antenna 143 → the first DPDT switch 131 → the second DPDT switch 132 → the second reception module 124 (e.g., L-DRX) → the radio frequency transceiver 11 (e.g., WTR).

The specific signal flow under B20+ N8 EN-DC is as follows:

n8 band Transmission (TX), rf transceiver 11 (e.g., WTR) → second transmit module 122 (e.g., LB PAmid) → second DPDT switch 132 → second antenna 142;

primary diversity receive (PRX) in N8 band, second antenna 142 → second DPDT switch 132 → second transmit module 122 (e.g., LB PAmid) → first receive module 123 (e.g., MLNA) → rf transceiver 11 (e.g., WTR);

diversity Reception (DRX) of the N8 band, the third antenna 143 → the first DPDT switch 131 → the second DPDT switch 132 → the second reception module 124 (e.g., L-DRX) → the radio frequency transceiver 11 (e.g., WTR).

The signal flow when the rf system 100 operates in the 4G mode is as follows:

transmission (TX) in the B28A band, i.e., radio transceiver 11 (e.g., WTR) → second transmission module 122 (e.g., LB PAmid) → second duplexer 152 (e.g., B28A duplexer) → second transmission module 122 (e.g., LB PAmid) → second DPDT switch 132 → first DPDT switch 131 → first antenna 141;

B20/B8 band Transmission (TX), rf transceiver 11 (e.g., WTR) → second transmission module 122 (e.g., LB PAmid) → second DPDT switch 132 → first DPDT switch 131 → first antenna 141;

primary diversity reception (PRX) of B28A band, first antenna 141 → first DPDT switch 131 → second DPDT switch 132 → second transmit module 122 (e.g., LB PAmid) → second duplexer 152 (e.g., B28A duplexer) → first receive module 123 (e.g., MLNA) → radio transceiver 11 (e.g., WTR);

primary diversity reception (PRX) in B20/B8 band, first antenna 141 → first DPDT switch 131 → second DPDT switch 132 → second transmit module 122 (e.g., LB PAmid) → first receive module 123 (e.g., MLNA) → radio frequency transceiver 11 (e.g., WTR);

diversity Reception (DRX) of B8/B20/B28, the second antenna 142 → the second DPDT switch 132 → the second reception module 124 (e.g., L-DRX) → the radio frequency transceiver 11 (e.g., WTR).

The radio frequency system in fig. 4a selects two DPDT switches, and distributes the transmission of the first low frequency band (LTE TX) and the transmission of the second low frequency band (NR TX) on different DPDTs, so as to prevent the influence of noise generated by burning out of one DPDT switch or signal intermodulation on another DPDT switch.

Optionally, a first P port of the first DPDT switch 131 is connected to the second antenna 142, a second P port of the first DPDT switch 131 is connected to the third antenna 143, a first T port of the first DPDT switch 131 is connected to the second transmitting module 122, a second T port of the first DPDT switch 131 is connected to a first receiving port of the second receiving module 124, a first P port of the second DPDT switch 132 is connected to the first antenna 141, a second P port of the second DPDT switch 132 is connected to the fourth antenna 144, a first T port of the second DPDT switch 132 is connected to the first duplexer 151, and a second T port of the second DPDT switch 132 is connected to the first filter 16;

the first transmitting module 121 is connected to the first antenna 141 through the first duplexer 151 and the second DPDT switch 132;

the second transmitting module 122 is connected to the second antenna 142 through the first DPDT switch 131;

a first receiving port of the first receiving module 123 passes through the first duplexer 151 and the second DPDT switch 132, and the first antenna 141;

the second receiving port of the first receiving module 123 is connected to the second antenna 142 through the second duplexer 152, the second transmitting module 122 and the switch module 13, and includes:

a second receiving port of the first receiving module 123 is connected to the second antenna 142 through the second duplexer 152, the second transmitting module 122 and the first DPDT switch 131;

the third receiving port of the first receiving module 123 is connected to the second antenna 142 through the second transmitting module 122 and the first DPDT switch 131;

the first receiving port of the second receiving module 124 is connected to the second antenna 142 through the first DPDT switch 131;

the first receiving port of the second receiving module 124 is connected to the third antenna 143 through the first DPDT switch 131;

the second receiving port of the second receiving module 124 is connected to the fourth antenna 144 through the first filter 16, and includes:

the second receiving port of the second receiving module 124 is connected to the fourth antenna 144 through the first filter 16 and the second DPDT switch 132.

Optionally, please refer to fig. 4b, where fig. 4b is a schematic structural diagram of another radio frequency system in which the switch module includes two switches according to the embodiment of the present application, as shown in fig. 4 b. The radio frequency system 100 includes a radio frequency transceiver 11, a radio frequency processing circuit 12, a first DPDT switch 131, a second DPDT switch 132, a first antenna 141, a second antenna 142, a third antenna 142, a fourth antenna 144, and a directional coupler 18, wherein the radio frequency transceiver 11 is connected to the radio frequency processing circuit 12;

the first transmitting module 121 is connected to the first antenna 141 through the first duplexer 151, the directional coupler 18 and the second DPDT switch 132, the second transmitting module 122 is connected to the second antenna 142 through the first DPDT switch 131, the first receiving port 1231 of the first receiving module 123 is connected to the first antenna 141 through the first duplexer 151, the directional coupler 18 and the second DPDT switch 132, the second receiving port 1232 of the first receiving module 123 is connected to the second antenna 142 through the first duplexer 152, the second transmitting module 122 and the first DPDT switch 131, the third receiving port 1233 of the first receiving module 123 is connected to the second antenna 142 through the second transmitting module 122 and the first DPDT switch 131, the first receiving port 1241 of the second receiving module 124 is connected to the second antenna 142 through the first DPDT switch 131, the second receiving port 1242 of the second receiving module 124 is connected to the fourth antenna 144 through the first filter 161 and the second DPDT switch 132; the antenna efficiency of the first antenna 141 and the second antenna 142 is higher than that of the third antenna 143 and the fourth antenna 144;

The specific signal flows under B20+ N28A EN-DC are as follows:

b20 band Transmission (TX), rf transceiver 11 (e.g., WTR) → first transmit module 121 (e.g., MMPA) → first duplexer 151 (e.g., B20 duplexer) → directional coupler 18 → second DPDT switch 132 → first antenna 141;

primary diversity reception (PRX) in the B20 band, first antenna 141 → second DPDT switch 132 → directional coupler 18 → first duplexer (e.g., B20 duplexer) → first reception module 123 (e.g., MLNA) → radio transceiver 11 (e.g., WTR);

diversity Reception (DRX) of B20 band, fourth antenna 124 → second DPDT switch 132 → first filter 161 (e.g., B20 SAW) → second reception module 124 (e.g., L-DRX) → radio frequency transceiver 11 (e.g., WTR);

N28A band Transmission (TX), rf transceiver 11 (e.g., WTR) → second transmission module 122 (e.g., LB PAmid) → second duplexer 152 (e.g., N28A duplexer) → second transmission module 122 (e.g., LB PAmid) → first DPDT switch 131 → second antenna 142;

a primary diversity receive (PRX) of N28A band, a second antenna 142 → a first DPDT switch 131 → a second transmit module 122 (e.g., LB PAmid) → a second duplexer 152 (e.g., N28A duplexer) → a first receive module 123 (e.g., MLNA) → a radio frequency transceiver 11 (e.g., WTR);

diversity Reception (DRX) of the N28A band, the third antenna 143 → the first DPDT switch 131 → the second reception module 124 (e.g., L-DRX) → the radio frequency transceiver 11 (e.g., WTR).

The specific signal flow under B20+ N8 EN-DC is as follows:

n8 band Transmission (TX), rf transceiver 11 (e.g., WTR) → second transmission module 122 (e.g., LB PAmid) → first DPDT switch 131 → second antenna 142;

primary diversity reception (PRX) of N8 band, second antenna 142 → first DPDT switch 131 → second transmitting module 122 (e.g., LB PAmid) → first receiving module 123 (e.g., MLNA) → radio frequency transceiver 11 (e.g., WTR);

diversity Reception (DRX) of the N8 band, the third antenna 143 → the first DPDT switch 131 → the second reception module 124 (e.g., L-DRX) → the radio frequency transceiver 11 (e.g., WTR).

Optionally, in an embodiment, when the radio frequency system 100 operates in the 4G mode, the first antenna 141 is used for transmitting in a first low frequency band and receiving in a main set of the first low frequency band, the second antenna 142 is used for transmitting in a second low frequency band and receiving in a main set of the second low frequency band, the third antenna 143 is used for diversity reception in the second low frequency band, the fourth antenna 144 is used for diversity reception in the first low frequency band, and the first filter 161 is used for filtering out frequency bands other than the first low frequency band.

The signal flow when the rf system 100 operates in the 4G mode is as follows:

B28A band Transmission (TX), rf transceiver 11 (e.g., WTR) → second transmission module 122 (e.g., LB PAmid) → second duplexer 152 (e.g., B28A duplexer) → second transmission module 122 (e.g., LB PAmid) → first DPDT switch 131 → second antenna 142;

b8 band Transmission (TX), rf transceiver 11 (e.g., WTR) → second transmission module 122 (e.g., LB PAmid) → first DPDT switch 131 → second antenna 142;

primary diversity reception (PRX) of B28A band, second antenna 142 → first DPDT switch 131 → second transmit module 122 (e.g., LB PAmid) → second duplexer 152 (e.g., B28A duplexer) → first receive module 123 (e.g., MLNA) → radio transceiver 11 (e.g., WTR);

b8 band primary diversity receive (PRX), second antenna 142 → first DPDT switch 131 → second transmit module 122 (e.g., LB PAmid) → first receive module 123 (e.g., MLNA) → rf transceiver 11 (e.g., WTR);

diversity Reception (DRX) of the N8/B28A band, the third antenna 143 → the first DPDT switch 131 → the second reception module 124 (e.g., L-DRX) → the radio frequency transceiver 11 (e.g., WTR).

Diversity Reception (DRX) of B20, fourth antenna 144 → second DPDT switch 132 → first filter 161 (e.g., B20 SAW) → second reception module 124 (e.g., L-DRX) → radio frequency transceiver 11 (e.g., WTR).

The radio frequency system in fig. 4b selects two DPDT switches, and distributes the transmission of the first low frequency band (LTE TX) and the transmission of the second low frequency band (NR TX) on different DPDTs, so as to prevent the influence of noise generated by burning out of one DPDT switch or signal intermodulation on another DPDT switch.

It should be noted that, in one possible embodiment, the first antenna 141 in fig. 4b is replaced by the third antenna 143, the second antenna 142 in fig. 4b is replaced by the first antenna 141, and the third antenna 143 in fig. 4b is replaced by the second antenna 142. At this time, when the radio frequency system 100 operates in the 4G mode, the first antenna 141 is used for transmitting the first low frequency band and receiving the main set of the first low frequency band, the first antenna 141 is also used for transmitting the second low frequency band and receiving the main set of the second low frequency band, and the second antenna 142 is used for diversity reception of the first low frequency band or the second low frequency band.

Referring to fig. 5, fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure, as shown in fig. 5, the electronic device 10 may include a radio frequency system 100 and a main board 200, wherein a first transmitting module 121, a second transmitting module 122, a first receiving module 123, a second receiving module 124, a first duplexer 151, a second duplexer 152, and a first filter 161 in the radio frequency system 100 may be disposed on the main board 200. When the rf system 100 operates in the non-independent networking mode, the rf system 100 is configured to implement transmission and reception of the first low frequency band and transmission and reception of the second low frequency band.

The foregoing is an implementation of the embodiments of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the embodiments of the present application, and these modifications and decorations are also regarded as the protection scope of the present application.

Claims

1. A radio frequency system is characterized by comprising a radio frequency transceiver, a radio frequency processing circuit, a change-over switch module, a first antenna, a second antenna, a third antenna and a fourth antenna, wherein the radio frequency transceiver is connected with the radio frequency processing circuit;

the radio frequency processing circuit comprises a first transmitting module, a second transmitting module, a first receiving module, a second receiving module, a first duplexer, a second duplexer and a first filter; the change-over switch module comprises two change-over switches, wherein the two change-over switches comprise a first DPDT switch and a second DPDT switch; a first P port of the first DPDT switch is connected to the first antenna, a second P port of the first DPDT switch is connected to the third antenna, a first T port of the first DPDT switch is connected to the first duplexer, a second T port of the first DPDT switch is connected to a first P port of the second DPDT, a second P port of the second DPDT switch is connected to the second antenna, a first T port of the second DPDT switch is connected to the second transmitting module, and a second T port of the second DPDT switch is connected to a first receiving port of the second receiving module;

the first transmitting module is connected to the first antenna through the first duplexer and the first DPDT switch, the second transmitting module is connected to the second antenna through the second DPDT switch, a first receiving port of the first receiving module is connected to the first antenna through the first duplexer and the first DPDT switch, a second receiving port of the first receiving module is connected to the second antenna through the second duplexer, the second transmitting module and the second DPDT switch, a third receiving port of the first receiving module is connected to the second antenna through the second transmitting module and the second DPDT switch, a first receiving port of the second receiving module is connected to the second antenna through the second DPDT switch, a second receiving port of the second receiving module is connected to the fourth antenna through the first filter, a first receiving port of the second receiving module is connected with the third antenna through the second DPDT switch and the first DPDT switch; the antenna efficiency of the first antenna and the second antenna is higher than the antenna efficiency of the third antenna and the fourth antenna;

2. The radio frequency system according to claim 1,

the radio frequency system works in a 4G mode, the first antenna is used for transmitting the first low-frequency band and receiving the main set of the first low-frequency band, the first antenna is also used for transmitting the second low-frequency band and receiving the main set of the second low-frequency band, and the second antenna is used for diversity reception of the first low-frequency band or the second low-frequency band.

3. A radio frequency system according to claim 1 or 2, wherein the second low frequency band comprises a first sub-band or a second sub-band.

4. The radio frequency system of claim 3, wherein the switch module comprises a switch comprising one of a double pole triple throw (DP 3T) switch, a 3P3T switch, or a DP4T switch.

5. The RF system of claim 4, wherein if the switch comprises a DP3T switch or a DP4T switch, the RF processing circuit further comprises a filter module, and the second receiving module is connected to the third antenna through the switch module or the filter module, comprising:

and a third receiving port of the second receiving module is connected with the third antenna through the filter module.

6. The RF system of claim 5, wherein the filter module comprises a second filter, a third filter, a first SPDT switch and a second SPDT switch, the P port of the first SPDT switch is connected to the third receiving port of the second receiving module, the first T port of the first SPDT switch is connected to the first end of the second filter, the second T port of the first SPDT switch is connected to the first end of the third filter, the second end of the second filter is connected to the first T port of the second SPDT switch, the second end of the third filter is connected to the second T port of the second SPDT switch, and the P port of the second SPDT switch is connected to the third antenna;

the second filter is used for filtering out frequency bands outside the first sub-frequency band, and the third filter is used for filtering out frequency bands outside the second sub-frequency band.

7. The RF system of claim 4, wherein if the switch comprises a 3P3T switch, the second receiving module is connected to the third antenna through the switch module or the filter module, comprising:

and the first receiving port of the second receiving module is connected with the third antenna through the change-over switch module.

8. The radio frequency system according to claim 1, wherein a first P port of the first DPDT switch is connected to the second antenna, a second P port of the first DPDT switch is connected to the third antenna, a first T port of the first DPDT switch is connected to the second transmitting module, a second T port of the first DPDT switch is connected to a first receiving port of the second receiving module, a first P port of the second DPDT switch is connected to the first antenna, a second P port of the second DPDT switch is connected to the fourth antenna, a first T port of the second DPDT switch is connected to the first duplexer, and a second T port of the second DPDT switch is connected to the first filter;

the first transmitting module is connected with the first antenna through the first duplexer and the change-over switch module, and comprises:

the first transmitting module is connected with the first antenna through the first duplexer and the second DPDT switch;

the second transmission module is connected with the second antenna through the change-over switch module, and comprises:

the second transmitting module is connected with the second antenna through the first DPDT switch;

the first receiving port of the first receiving module is connected to the first antenna through the first duplexer and the switch module, and includes:

a first receiving port of the first receiving module is connected with the first antenna through the first duplexer and the second DPDT switch;

the second receiving port of the first receiving module is connected to the second antenna through the second duplexer, the second transmitting module and the switch module, and the second receiving port comprises:

a second receiving port of the first receiving module is connected with the second antenna through the second duplexer, the second transmitting module and the first DPDT switch;

the third receiving port of the first receiving module is connected with the second antenna through the second transmitting module and the switch module, and the third receiving port comprises:

a third receiving port of the first receiving module is connected with the second antenna through the second transmitting module and the first DPDT switch;

the first receiving port of the second receiving module is connected with the second antenna through the switch module, and the first receiving port comprises:

a first receiving port of the second receiving module is connected with the second antenna through the first DPDT switch;

the second receiving module is connected with the third antenna through the switch module or the filter module, and comprises:

a first receiving port of the second receiving module is connected with the third antenna through the first DPDT switch;

the second receiving port of the second receiving module is connected to the fourth antenna through the first filter, and includes:

and a second receiving port of the second receiving module is connected with the fourth antenna through the first filter and the second DPDT switch.

9. An electronic device comprising the radio frequency system of any one of claims 1 to 8, wherein the radio frequency system is configured to implement transmission and reception of a first low frequency band and transmission and reception of a second low frequency band when the radio frequency system is operating in a non-standalone networking mode.