CN217693325U

CN217693325U - Radio frequency system and electronic equipment

Info

Publication number: CN217693325U
Application number: CN202221363243.8U
Authority: CN
Inventors: 李庆海
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-10-28
Anticipated expiration: 2032-05-31

Abstract

The utility model discloses a radio frequency system and electronic equipment. The radio frequency system is applied to a mobile terminal and comprises: the Beidou chip is used for receiving and transmitting radio frequency data of a first frequency band of a Beidou satellite communication system; a radio frequency transceiver device for transceiving radio frequency data of a second frequency band of the cellular mobile communication system; and one end of the transceiving channel is switchably connected with the Beidou chip or the radio frequency transceiving device, and the other end of the transceiving channel is connected with the antenna and used for transceiving radio frequency data of a first frequency band or radio frequency data of a second frequency band. The utility model provides a scheme aims at solving among the prior art big technical problem of hardware occupation space of big dipper function.

Description

Radio frequency system and electronic equipment

Technical Field

The utility model relates to a mobile communication field, more specifically relates to a radio frequency system and electronic equipment.

Background

The Beidou Satellite Navigation System (BDS) is a Satellite Navigation System independently developed in China, and can provide all-weather, all-time and high-precision positioning, navigation and time service for users around the world. The beidou system provides basic services of positioning, speed measurement and time Service for global users, and also provides global short message communication Service, namely, the function of Radio Determination Satellite Service (RDSS) can be realized. The short message function is a technical breakthrough which is unique to the Beidou system and is not possessed by the GPS at present. The satellite positioning terminal and the Beidou satellite or the Beidou ground service station can directly perform bidirectional information transmission through satellite signals, and the GPS can only perform unidirectional transmission, namely, the terminal can only be supported to receive position signals from the satellite.

At present, a system supporting the Beidou RDSS function is generally a special system device and is commonly used in the fields of fishing boats, trains, military weapons and the like. With the perfect network deployment of the Beidou satellite navigation system and the popularization and application of the Beidou system, more and more popular products, especially mobile phone products, also need to introduce the short message communication function of the Beidou so as to meet the requirements of emergency rescue, field communication, marine communication and the like. The hardware of the Beidou function on the mobile terminal occupies a large space.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a radio frequency system and electronic equipment aims at solving among the prior art big technical problem of big dipper function's hardware occupation space on the mobile terminal.

In order to achieve the above object, the utility model provides a radio frequency system is applied to mobile terminal, include:

the Beidou chip is used for receiving and transmitting radio frequency data of a first frequency band of a Beidou satellite communication system;

a radio frequency transceiver device for transceiving radio frequency data of a second frequency band of the cellular mobile communication system;

and one end of the transceiving passage is connected with the Beidou chip or the radio frequency transceiving device in a switchable manner, and the other end of the transceiving passage is connected with the antenna and used for transceiving radio frequency data of the first frequency band or the second frequency band.

Further, the Beidou chip is provided with a first sending port and a first receiving port;

the radio frequency transceiver device is provided with a second transmitting port and a second receiving port;

the transceiving path comprises a transmitting circuit and a receiving circuit, wherein:

one end of the transmitting circuit is connected with the first transmitting port or the second transmitting port in a switchable manner, and the other end of the transmitting circuit is connected with the antenna and used for transmitting radio frequency data of the first frequency band or the second frequency band;

one end of the receiving circuit is connected with the first receiving port or the second receiving port in a switchable manner, and the other end of the receiving circuit is connected with the antenna and used for receiving radio frequency data of the first frequency band or the second frequency band.

Further, the transmission circuit includes a power amplifier and a first filter circuit, wherein:

one end of the power amplifier is connected with the first transmitting port or the second transmitting port in a switchable manner, and the other end of the power amplifier is connected with one end of the first filter circuit and is used for amplifying the radio-frequency signals of the first frequency band or the second frequency band;

and the other end of the first filter circuit is connected with the antenna and is used for filtering the amplified radio-frequency signal of the first frequency band or the second frequency band and sending the filtered radio-frequency signal through the antenna.

Further, the receiving circuit includes a low noise amplifier and a second filter circuit, wherein:

one end of the second filter circuit is connected with the antenna and is used for filtering the radio frequency signal of the first frequency band or the second frequency band received from the antenna;

one end of the low-noise amplifier is connected with the first receiving port or the second receiving port in a switchable manner, and the other end of the low-noise amplifier is connected with the other end of the second filter circuit and used for amplifying the radio-frequency signals after filtering and transmitting the radio-frequency signals after amplifying through the first receiving port or the second receiving port.

Further, the system further comprises:

the combiner has two first ends and a second end; the first end of the combiner is connected with the other end of the transmitting circuit, the other first end of the combiner is connected with the other end of the receiving circuit, and the second end of the combiner is connected with the antenna and used for combining the radio-frequency signal of the transmitting circuit and the radio-frequency signal of the receiving circuit.

Further, the system further comprises:

the first switch device is provided with two first ends and a second end, one first end of the first switch device is connected with the Beidou chip, the other first end of the first switch device is connected with the radio frequency transceiver device, and the second end of the first switch device is connected with the transmitting circuit and used for controlling the first end and the second end of the first switch device to be in a conducting state;

and/or the presence of a gas in the gas,

the second switch device is provided with two first ends and a second end, one first end of the second switch device is connected with the Beidou chip, the other first end of the second switch device is connected with the radio frequency transceiver device, and the second end of the first switch device is connected with the receiving circuit and used for controlling the first end and the second end of the first switch device to be in a conducting state.

Further, the system further comprises:

a processor for transceiving radiodetermination satellite service RDSS data;

the Beidou chip is also used for carrying out protocol conversion on the radio frequency data of the first frequency band to obtain RDSS data; and carrying out protocol conversion on the received RDSS data to obtain radio frequency data of a first frequency band.

Further, the processor has a first control interface and a second control interface, the first control interface is connected to the first switch device, the second control interface is connected to the second switch device, and is configured to output a first control signal and a second control signal, where the first control signal is used to control a conducting state of the first switch device, and the second control signal is used to control a conducting state of the second switch device

Further, the system further comprises:

and the display device is connected with the processor and is used for displaying the RDSS data.

An electronic device comprising a radio frequency system as claimed in any of the above.

The utility model discloses among the technical scheme, the receiving and dispatching passageway can transmit the operation to the radio frequency data of the first frequency channel of big dipper chip receiving and dispatching or the radio frequency data of the second frequency channel of radio frequency receiving and dispatching device receiving and dispatching for this receiving and dispatching passageway is common to big dipper satellite communication system and honeycomb mobile communication system. The area of the circuit board can be effectively saved, and the production cost is reduced. .

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of a device supporting the Beidou RDSS function in the related art;

fig. 2 is a schematic diagram of a radio frequency system according to an embodiment of the present application;

FIG. 3 is another schematic view of the system of FIG. 2;

FIG. 4 (a) is a schematic diagram of a transmit circuit in the system of FIG. 3;

FIG. 4 (b) is a schematic diagram of a receiving circuit in the system of FIG. 3;

FIG. 5 is another schematic view of the system of FIG. 3;

FIG. 6 is yet another schematic view of the system shown in FIG. 3;

FIG. 7 is yet another schematic diagram of the system of FIG. 3;

fig. 8 is a schematic application diagram of a radio frequency system according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "secured" are to be construed broadly, and thus, for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.

Fig. 1 is a schematic diagram of a device supporting the beidou RDSS function in the related art. As shown in fig. 1, the RDSS module occupies a large area of a PCB, has high cost, cannot be directly deployed on a mobile terminal (e.g., a mobile phone), and has no good versatility due to its disadvantages of high cost, large volume, complex operation, and high popularization difficulty.

Based on the analysis, the embodiment of the application provides a system which is high in universality, low in cost, small in occupied PCB area and capable of achieving the Beidou RDSS function on a common mobile phone.

Fig. 2 is a schematic diagram of a radio frequency system according to an embodiment of the present application. As shown in fig. 2, the system is applied to a mobile terminal, and includes:

and one end of the transceiving passage is switchably connected with the Beidou chip or the radio frequency transceiving device, and the other end of the transceiving passage is connected with the antenna and used for transceiving radio frequency data of a first frequency band or a second frequency band.

In the structure shown in fig. 2, the big dipper chip can be a big dipper three-number full-function safety chip SOC, and the big dipper chip integrates a radio frequency receiving and transmitting channel, so that functions of receiving and transmitting high-reliability big dipper short messages, giving high-precision big dipper time service and the like can be realized;

the Beidou chip can be a Dolphin No. three navigation SOC chip generated by Dolphin Beidou, or other SOCs produced by factories such as HBP2012 created by Huali.

In the structure shown in fig. 2, the rf transceiver device is a device conventionally disposed in a mobile terminal, and is used for transmitting and receiving rf signals of cellular mobile communication data.

In the structure shown in fig. 2, the transceiving path is a signal transmission structure conventionally provided in a mobile terminal, and is used for transmitting and receiving radio frequency signals. Specifically, the transceiving path may amplify and filter a radio frequency signal to be transmitted and then transmit the radio frequency signal through an antenna; and receiving the radio frequency signal from the antenna, filtering and amplifying the radio frequency signal, and sending the radio frequency signal to the processor.

In the embodiment of the application, the receiving and sending passage is connected to the Beidou chip and the radio frequency receiving and sending device in a switchable manner, so that the radio frequency data of the first frequency band received and sent by the Beidou chip or the radio frequency data of the second frequency band received and sent by the radio frequency receiving and sending device can be transmitted and operated, and the Beidou satellite communication system and the cellular mobile communication system share the receiving and sending passage.

The system that this application embodiment provided, the receiving and dispatching passageway can transmit the operation to the radio frequency data of the first frequency channel of big dipper chip receiving and dispatching or the radio frequency data of the second frequency channel of radio frequency receiving and dispatching device receiving and dispatching for this receiving and dispatching passageway is jointly used to big dipper satellite communication system and honeycomb mobile communication system, and the area that can effectual save the circuit board reduces manufacturing cost.

Fig. 3 is another schematic view of the system shown in fig. 2. As shown in fig. 3, the big dipper chip has a first transmitting port and a first receiving port;

the radio frequency transceiver device is provided with a second transmitting port TX2 and a second receiving port;

one end of the transmitting circuit is connected with the first transmitting port or the second transmitting port TX2 in a switchable manner, and the other end of the transmitting circuit is connected with the antenna and used for transmitting radio frequency data of a first frequency band or a second frequency band;

one end of the receiving circuit is connected with the first receiving port RX1 or the second receiving port RX2 in a switchable mode, and the other end of the receiving circuit is connected with the antenna and used for receiving radio frequency data of the first frequency band or the second frequency band.

In the structure shown in fig. 3, a first transmitting port TX1 of the beidou chip is used for transmitting radio frequency data to be transmitted in a first frequency band, which is output to the transceiving path, and a first receiving port RX1 is used for receiving the radio frequency data in the first frequency band from the transceiving path.

In the structure shown in fig. 3, a second transmitting port TX2 of the rf transceiver device is configured to output rf data to be transmitted in a second frequency band to the transceiving path, and a second receiving port RX2 is configured to receive the rf data in the second frequency band from the transceiving path.

In the structure shown in fig. 3, the transmitting circuit of the transceiving path is switchably connected to the first transmitting port TX1 or the second transmitting port TX2, so that the transmitting circuit can obtain the rf data to be transmitted in the first frequency band or the second frequency band through the first transmitting port TX1 or the second transmitting port TX2, and transmit the rf data to be transmitted through the antenna; similarly, the receiving circuit of the transceiving path is switchably connected to the first receiving port RX1 or the second receiving port RX2, so that after the receiving circuit obtains the radio frequency data of the first frequency band or the second frequency band from the antenna, the received radio frequency data can be sent to the beidou chip or the radio frequency transceiver through the first receiving port RX1 or the second receiving port RX 2.

As can be seen from the structure shown in fig. 3, on the premise that the beidou satellite communication system and the cellular mobile communication system share the transceiving path, the mutual independence of the signal transmission between the beidou chip and the radio frequency transceiver can be realized by respectively providing the respective transmitting port and receiving port for the beidou chip and the radio frequency transceiver. Furthermore, the transmitting and receiving circuit is arranged on the transmitting and receiving channel, so that the transmitting and receiving processes of data can be independent, and the data processing efficiency is improved.

Fig. 4 (a) is a schematic diagram of a transmitting circuit in the system shown in fig. 3. As shown in fig. 4 (a), the transmitting circuit includes a Power Amplifier (PA) and a first filter circuit, where:

one end of the power amplifier is switchably connected with a first transmitting port TX1 or a second transmitting port TX2, and the other end of the power amplifier is connected with one end of the first filter circuit and is used for amplifying radio-frequency signals of a first frequency band or a second frequency band;

the other end of the first filter circuit is connected with the antenna and is used for filtering the amplified radio-frequency signal of the first frequency band or the second frequency band and sending the radio-frequency signal after filtering through the antenna.

Fig. 4 (b) is a schematic diagram of a receiving circuit in the system shown in fig. 3. As shown in fig. 4 (b), the receiving circuit includes a Low Noise Amplifier (LNA) and a second filter circuit, where:

one end of the low-noise amplifier is switchably connected to the first receiving port RX1 or the second receiving port RX2, and the other end of the low-noise amplifier is connected to the other end of the second filter circuit, and is configured to amplify the filtered radio frequency signal and transmit the amplified radio frequency signal through the first receiving port RX1 or the second receiving port RX 2.

Fig. 5 is another schematic view of the system shown in fig. 3. As shown in fig. 5, the system further includes:

the combiner has two first ends and a second end; the first end of the combiner is connected with the other end of the transmitting circuit, the other first end of the combiner is connected with the other end of the receiving circuit, and the second end of the combiner is connected with the antenna and used for combining the radio frequency signal of the transmitting circuit and the radio frequency signal of the receiving circuit.

The combiner combines the sending signal and the receiving signal into a path, only one antenna is needed to complete the receiving and sending functions, the number of the antennas is reduced, the space occupied by hardware is reduced, and the system integration level is improved.

Fig. 6 is yet another schematic diagram of the system shown in fig. 3. As shown in fig. 6, the system further includes:

and/or the presence of a gas in the gas,

The first and second switching devices may be SPDT (single-pole, double-throw) or DPDT (double-pole, double-throw).

Through the control of the first switch device, one of the Beidou chip and the radio frequency transceiver can be connected with the transmitting circuit, namely the transmitting circuit is enabled to transmit the radio frequency signal of the first frequency band or the second frequency band; in a similar way, through the control of the second switch device, one of the Beidou chip and the radio frequency transceiver can be connected with the receiving circuit, namely the receiving circuit receives the radio frequency signal of the first frequency band or the second frequency band.

Fig. 7 is yet another schematic diagram of the system shown in fig. 3. As shown in fig. 7, the system further includes:

a processor for transceiving RDSS data;

the Beidou chip is also used for carrying out protocol conversion on the radio frequency data of the first frequency band to obtain RDSS data; and performing protocol conversion on the received RDSS data to obtain radio frequency data of the first frequency band.

In the system shown in fig. 7, the processor is a processor built in the mobile terminal, and can process the received and transmitted data for the user to use.

Specifically, the processor and the Beidou chip can communicate through a serial port, and data interaction is achieved. In addition, the Beidou chip can convert radio frequency data received from the transceiving channel into data conforming to a serial communication protocol so as to perform data interaction with the processor, and convert RDSS data received from the processor into radio frequency data of a first frequency band so as to transmit the radio frequency data by using the transceiving channel.

Specifically, the first control interface and the second control interface may be GPIO interfaces.

The processor controls the conduction state of the first switch device through the first control interface and controls the conduction state of the second switch device through the second control interface so as to realize data transceiving operation on the Beidou chip or the radio frequency transceiver device through the transceiving channel.

Optionally, the system further includes:

The system provided by the embodiment of the present application is described below by taking a specific application scenario as an example:

fig. 8 is a schematic application diagram of a radio frequency system according to an embodiment of the present application. As shown in fig. 8, the system is applied to a mobile terminal, the mobile terminal includes a display screen, a camera, a baseband processor, a radio frequency transceiver, an audio module, and the like, and a set of independent big dipper RDSS circuit is added externally to support a big dipper short message system.

In the structure shown in fig. 8, compared with the system structure of a conventional mobile terminal, a full-function baseband SOC supporting the big dipper and an external circuit thereof are added, and the functions of each device related to the RDSS function in the block diagram are as follows:

beidou No. three full-function SOC: the radio frequency channel is integrated, so that functions of high-reliability Beidou short message receiving and sending, high-precision Beidou time service and the like can be realized; the SOC can demodulate the received short message information and then send the short message information to the baseband processor through the UART serial port, the baseband processor completes character string analysis of the UART, and finally, a final RDSS message is displayed on a screen in a text form; or the text information sent by the baseband processor through the UART serial port, namely the content of the short message to be sent, is adjusted into an RDSS radio frequency signal, then the RDSS radio frequency signal is amplified by the PA and radiated until the Beidou satellite receives the signal and then is forwarded to other RDSS users, and the whole RDSS short message receiving and sending process is completed; the scheme is designed by taking a dolphin navigation SOC chip of Beidou of Hai Ge as an example, and in practical application, other SOCs of manufacturers such as HBP2012 created by Hua Li can be replaced, and the basic principle and the application method are similar to those of the scheme;

SDPT0 is used to select whether cellular or RDSS operation is to be performed, for example, radio frequency links (e.g., B3/B4, etc.) of intermediate frequency signals of cellular or RDSS radio frequency links may be selected. After gating the corresponding radio frequency link, the PA works normally, and corresponding radio frequency signals are radiated out through an antenna; the normal default is the working state of a cellular link, and only after the RDSS mode is triggered, the RDSS circuit is gated;

SDPT1 is used to select whether cellular or RDSS operation is used. For example, it is possible to select whether a radio frequency link of a cellular high frequency signal (e.g., B41/B53, etc.) or an RDSS radio frequency link, i.e., whether cellular operation or RDSS operation is selected; after the corresponding module is gated, the LNA normally works, amplifies signals received by the antenna, and then sends the amplified signals to a radio frequency transceiver or a Beidou special SOC for demodulation; the normal default is the working state of a cellular link, and only after the RDSS mode is triggered, the RDSS circuit is gated;

the wave filter is band pass filter, can the filtering outband signal, guarantees that the spurious satisfaction of radiation requires or guarantees that the outband signal of inputing LNA is less, can not block LNA:

the combiner combines the TX/RX signals into a path, and only one antenna is needed to complete the TX/RX function, so that the number of the antennas and the space of a mobile phone are reduced;

the PA module can select LXK6618, the maximum output power of the PA module can reach 37dBm (5W), and the requirements of an RDSS system and a honeycomb can be met; the LNA module can select the BGA824, has a noise coefficient of 0.55, and can meet the requirements of an RDSS system and a honeycomb.

Fig. 8 is a schematic transmission diagram of an RDSS signal according to an embodiment of the present application. As shown in fig. 8, in the actual work, the mobile phone supporting the RDSS function enters a special APP through a UI interface of the mobile phone, edits corresponding text information (RDSS can only transmit text information at present), after the editing is completed, the beidou SOU modulates and encodes the corresponding information, and then transmits the information to the beidou satellite in the space, after the beidou satellite receives a signal, the beidou satellite decrypts and demodulates the received signal, and then transmits the corresponding message to the ground monitoring center, and the ground monitoring center encrypts the corresponding message and transmits the encrypted message to the beidou satellite in the space, and after the beidou satellite receives the corresponding signal, the beidou satellite transmits the corresponding information to the mobile phone supporting the RDSS function or other dedicated RDSS devices.

An embodiment of the present application further provides an electronic device, including the radio frequency system described above.

In summary, the solution provided by the embodiment of the present application has the following advantages, including:

the Beidou short message RDSS function (currently, the realization of mobile phone products is not available) is added; when no site covered by an operator (such as navigation, field, desert and the like) exists or operation equipment is abnormal (such as earthquake, flood and the like) and no telecommunication signal is covered, the RDSS function of the mobile phone can be used for sharing position information, or the interaction of main information is completed through the RDSS short message function, and no special equipment is needed, so that the method is very convenient;

the transmitting function of the Beidou chip and the intermediate frequency transmitting function of the radio frequency transceiver share the transmitting circuit, and the intermediate frequency of the honeycomb can be acquiescent and the normal work can be realized(ii) a When the RDSS function is triggered, the RDSS link is switched through the first switch device, device multiplexing is achieved, and the PCB area and the BOM cost can be saved. In practical application, the PCB area is saved by about 20mm ² About, the cost is saved by more than 0.5 dollar.

The receiving function of the Beidou chip and the high-frequency receiving function of the radio frequency transceiver share the receiving circuit. The high frequency of the honeycomb can be defaulted to work normally; when the RDSS function is triggered, the RDSS link is switched to through the SDPT switch, the multiplexing of devices is achieved, and the area of a PCB and the BOM cost can be saved. In practical application, the PCB area is saved by about 10mm ² About, the cost is saved by more than 0.2 dollar.

The RDSS antenna and the honeycomb medium-high frequency common antenna can improve the integration level and the mainboard utilization rate of the mobile phone, and can save the antenna cost of the mobile phone, such as contact spring pieces, LDS wiring and the like, and the estimated saving is about 0.5 dollar.

According to the device characteristics and link insertion loss calculation, the RDSS can realize the following indexes:

transmitting power of 37dBm +/-1 dB in L frequency band (1610-1626.5 MHz)

S frequency band (2483.5-2500 MHz) receiving sensitivity of-127.6 dbm

For the cellular, the index may meet the 3gpp requirements.

The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.

Claims

1. A radio frequency system, applied to a mobile terminal, comprising:

and one end of the transceiving path is switchably connected with the Beidou chip or the radio frequency transceiving device, and the other end of the transceiving path is connected with the antenna and used for transceiving radio frequency data of the first frequency band or the second frequency band.

2. The system of claim 1, wherein:

the Beidou chip is provided with a first sending port and a first receiving port;

3. The system of claim 2, wherein the transmit circuit comprises a power amplifier and a first filter circuit, wherein:

and the other end of the first filter circuit is connected with the antenna and is used for filtering the amplified radio frequency signal of the first frequency band or the second frequency band and sending the filtered radio frequency signal through the antenna.

4. The system of claim 2, wherein the receive circuit comprises a low noise amplifier and a second filter circuit, wherein:

5. The system of claim 2, further comprising:

6. The system of claim 2, further comprising:

and/or the presence of a gas in the gas,

7. The system of claim 6, further comprising:

a processor for transceiving radiodetermination satellite service RDSS data;

8. The system of claim 7, wherein:

the processor is provided with a first control interface and a second control interface, the first control interface is connected with the first switch device, the second control interface is connected with the second switch device and used for outputting a first control signal and a second control signal, the first control signal is used for controlling the conducting state of the first switch device, and the second control signal is used for controlling the conducting state of the second switch device.

9. The system of claim 7, further comprising:

10. An electronic device comprising a radio frequency system as claimed in any one of claims 1 to 9.