CN118054815B

CN118054815B - Radio frequency transmission system and transmission method

Info

Publication number: CN118054815B
Application number: CN202410425172.7A
Authority: CN
Inventors: 吴家明; 俞正明; 刁杏雄; 刘泽帆; 廖贵星
Original assignee: Guangdong Shixin Microelectronics Technology Co ltd
Current assignee: Guangdong Shixin Microelectronics Technology Co ltd
Priority date: 2024-04-10
Filing date: 2024-04-10
Publication date: 2024-07-19
Anticipated expiration: 2044-04-10
Also published as: CN118054815A

Abstract

The invention relates to the technical field of communication, in particular to a radio frequency transmission system and a transmission method, which mainly comprise output equipment and terminal equipment; the output equipment outputs a direct-current power supply signal, a control signal and a radio frequency signal, the control signal is modulated according to the direct-current power supply signal, and the direct-current power supply signal, the control signal and the radio frequency signal are transmitted to the next-stage equipment in a combining way; the terminal equipment receives the direct current power supply signal transmitted by the upper-level equipment, stores and supplies power, receives the control signal transmitted by the upper-level equipment, and opens a corresponding radio frequency channel according to the control signal so as to allow the received radio frequency signal to pass and transmit. The invention directly modulates the control signal on the direct-current power supply signal, reduces the complexity of the circuit, can effectively save the use space, is beneficial to the space utilization and miniaturization of equipment and reduces the cost.

Description

Radio frequency transmission system and transmission method

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a radio frequency transmission system and a transmission method.

Background

RF is radio frequency current, which is a short term for high frequency alternating electromagnetic wave.

In the prior art, in order to make the coverage of the radio frequency signal wider or perform regional coverage so as to facilitate positioning of the terminal equipment, multiple antennas are necessarily used to improve the coverage or perform regional coverage, but often, the scenes or projects requiring multiple antenna application have only one signal source, and then the goal is achieved by adopting a radio frequency branching mode through a power division mode or a time division multiplexing mode.

For example, the indoor distribution system adopts a power division mode to expand the antennas, but the more antennas need to be accessed, the smaller the power transmitted from the base station equipment to the antenna end is, but the higher the receiving sensitivity of the general terminal equipment is, the smaller the influence is, and the signals are also covered in real time, so the indoor distribution system can adopt a power division expansion and branching mode.

However, for other applications, such as UHF RFID, etc., there is a strict requirement on output power, and the power division method is used to despread the radio frequency channel, so that the effect of application cannot be achieved, and therefore, the time division multiplexing method is used to despread the radio frequency channel, and the multiple antenna expansion method is achieved through multiple radio frequency splitters. The existing radio frequency branching unit must be connected with a power supply and a control signal, and the more the radio frequency branching unit is connected, the more coaxial cables and power supply control lines are needed, the more the wiring is bulky, the more space wiring is needed, and the more complicated the multi-stage branching is. And the power supply signal and the control signal need to be output respectively, so that the circuit is complex, and the cost is increased.

The prior art therefore has the following disadvantages:

The power supply signal and the control signal need to be output respectively, and the circuit is relatively complex;

The more wires that need to be extended, the more complicated the wire is.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention aims to provide a radio frequency transmission system and a transmission method, which simplify signal modulation, simplify cable layout, reduce the complexity of a circuit and reduce the cost.

In order to achieve the above object, the present invention can be achieved by the following technical scheme:

a radio frequency transmission system comprises an output device and a terminal device;

The output equipment outputs a direct-current power supply signal, a control signal and a radio frequency signal, the control signal is modulated according to the direct-current power supply signal, and the direct-current power supply signal, the control signal and the radio frequency signal are transmitted to the next-stage equipment in a combining way;

The terminal equipment receives the direct current power supply signal transmitted by the upper-level equipment, stores and supplies power, receives the control signal transmitted by the upper-level equipment, and opens a corresponding radio frequency channel according to the control signal so as to allow the received radio frequency signal to pass and transmit.

Further, the multi-channel multi-stage wireless communication system further comprises at least one stage of radio frequency amplifier for outputting signals step by step, wherein the input end of the radio frequency amplifier receives direct current power supply signals, control signals and radio frequency signals transmitted by the previous stage of equipment, the radio frequency amplifier outputs the direct current power supply signals and the radio frequency signals, the control signals are modulated according to the direct current power supply signals, and the direct current power supply signals, the control signals and the radio frequency signals are transmitted to the multi-channel next stage of equipment through the corresponding number of amplifying output ends.

Further, the output equipment comprises an output power supply module, an output control module and an output radio frequency module;

The output power supply module provides power for the output control module and the output radio frequency module, and provides direct current power supply signals for next-stage equipment;

the output radio frequency module is used for generating radio frequency signals;

the output control module modulates the direct current power supply signal in a switch control mode to generate a control signal and communicates with the output radio frequency module.

Further, the radio frequency circuit expander comprises a circuit expansion energy storage circuit, a circuit expansion power supply module, a circuit expansion control module and a circuit expansion radio frequency switch;

The circuit-expanding energy storage circuit receives and stores a direct-current power supply signal transmitted by the previous-stage equipment, regulates and controls voltage through the circuit-expanding power supply module, supplies power to the circuit-expanding control module and the circuit-expanding radio frequency switch, and provides a direct-current power supply signal for the next-stage equipment;

the path expansion control module modulates a direct-current power supply signal in a switch modulation mode to generate a control signal, and transmits the control signal to next-stage equipment;

The channel expansion control module receives a control signal transmitted by the previous-stage equipment, and controls the channel expansion radio frequency switch to open a corresponding radio frequency channel according to the control signal so as to allow radio frequency signals to pass through.

Further, the terminal equipment comprises a terminal energy storage circuit, a terminal control module, a terminal radio frequency switch and an antenna;

The terminal energy storage circuit receives and stores a direct current power supply signal transmitted by the previous-stage equipment and supplies power to the terminal control module;

the terminal control module receives a control signal transmitted by the previous-stage equipment, and controls the terminal radio frequency switch to open a corresponding radio frequency channel according to the control signal so as to allow radio frequency signals to pass through;

Each output port of the radio frequency switch is connected with an antenna, and the antenna transmits or receives radio frequency signals.

Further, the output device comprises a pull-up resistor, a suppression filter circuit and a blocking capacitor;

The direct current power supply signal and the control signal are output through the output end of the output control module;

The output power supply module is connected with the output end of the output control module through a pull-up resistor;

The output end of the output radio frequency module is connected with the input end of the next-stage equipment through a coaxial cable after passing through a blocking capacitor and the output end of the output control module passes through a suppression filter circuit.

Further, the output device comprises an output field effect transistor, an output radio frequency switch, a suppression filter circuit and a blocking capacitor;

The output end of the output power supply module is connected with the input end of the output field effect tube, the output end of the output control module is connected with the control end of the output field effect tube, and the output end of the output field effect tube outputs the direct current power supply signal and the control signal;

the output end of the output radio frequency module is connected with the input end of the output radio frequency switch, and the output radio frequency switch is provided with at least one output port;

and the output end of the output field effect tube passes through the suppression filter circuit, and the output port of the output radio frequency switch passes through the blocking capacitor and then is connected with the input end of the next-stage equipment through a coaxial cable in a combined way.

Further, the input end of the circuit-expanding energy storage circuit receives a direct-current power supply signal transmitted by the upper-stage equipment through the suppression filter circuit;

The input end of the path expansion control module receives a control signal transmitted by the previous-stage equipment through the suppression filter circuit, and the output end of the path expansion control module outputs a direct-current power supply signal and a control signal;

The input port of the path-expanding radio frequency switch receives radio frequency signals transmitted by the previous-stage equipment through a blocking capacitor;

the output ends of the path expansion control modules pass through the suppression filter circuit, the output ports of the path expansion radio frequency switches pass through the blocking capacitors and then are combined to be transmitted to the multipath next-stage equipment through coaxial cables by the corresponding number of path expansion output ends.

the input end of the path expansion control module sequentially receives control signals transmitted by the upper-level equipment through the suppression filter circuit and the level conversion circuit;

the output end of the road expansion power supply module is connected with the input end of the road expansion field effect tube, the output end of the road expansion control module is connected with the control end of the road expansion field effect tube, and the output end of the road expansion field effect tube outputs a direct current power supply signal and a control signal;

The output ends of the extended-path field effect transistors pass through the suppression filter circuit, the output ports of the extended-path radio frequency switches pass through the blocking capacitors and then are combined to pass through the extended-path output ends of corresponding quantity and are transmitted to the multipath next-stage equipment through coaxial cables.

Further, the input end of the terminal energy storage circuit receives and stores the direct current power supply signal transmitted by the upper-stage equipment through the suppression filter circuit;

the input end of the terminal control module receives a control signal transmitted by the previous-stage equipment through the suppression filter circuit;

and an input port of the terminal radio frequency switch receives a radio frequency signal transmitted by the previous-stage equipment through the blocking capacitor.

Further, the input end of the terminal energy storage circuit receives and stores a direct current power supply signal transmitted by the previous-stage equipment through the suppression filter circuit, and the terminal power supply module regulates and controls voltage to supply power to the terminal control module;

the input end of the terminal control module sequentially receives control signals transmitted by the previous-stage equipment through the suppression filter circuit and the level conversion circuit;

Further, the terminal device and the radio frequency expander modulate a response signal according to a direct current power supply signal transmitted by the previous-stage device, and send the response signal to the previous-stage device.

A radio frequency transmission method comprising the steps of:

Outputting a direct current power supply signal and a radio frequency signal;

Modulating a direct-current power supply signal in a switch control mode to generate a control signal;

The direct-current power supply signal, the control signal and the radio frequency signal are transmitted to the next-stage equipment in a combining way;

The next-stage equipment receives the transmitted direct-current power supply signal and stores and supplies power;

The next-stage equipment receives the transmitted control signal and opens a corresponding radio frequency channel according to the control signal, so that the radio frequency signal can pass through and transmit or receive the radio frequency signal.

Compared with the prior art, the invention has the following beneficial effects:

The invention directly modulates the control signal on the direct-current power supply signal, reduces the complexity of the circuit, can effectively save the use space, is beneficial to the space utilization and miniaturization of equipment and reduces the cost. The direct current power supply signal, the control signal and the radio frequency signal are transmitted in a combined way, so that the cable layout is simplified, the wiring quantity during equipment connection is greatly reduced, bus connection is not needed between output equipment and terminal equipment, and the wiring is simpler.

Drawings

FIG. 1 is a schematic diagram of a system architecture according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of a system architecture according to a second embodiment of the present invention;

FIG. 3 is a schematic diagram of a system architecture of a third embodiment of the present invention;

FIG. 4 is a schematic diagram of a system architecture of a fourth embodiment of the present invention;

FIG. 5 is a schematic diagram of a system architecture of a fifth embodiment of the present invention;

FIG. 6 is a schematic diagram of a system configuration of a sixth embodiment of the present invention;

FIG. 7 is a schematic diagram of a tank circuit of the present invention;

FIG. 8 is a schematic diagram of a method of modulating a control signal according to a DC power signal in accordance with the present invention;

Fig. 9 is a circuit configuration diagram of an output device of the third and fourth embodiments;

Fig. 10 is a circuit configuration diagram of a radio frequency amplifier of the third and fourth embodiments;

fig. 11 is a circuit configuration diagram of a terminal device of the third and fourth embodiments;

fig. 12 is a circuit configuration diagram of an output device of the fifth embodiment and the sixth embodiment;

fig. 13 is a circuit configuration diagram of a radio frequency amplifier of the sixth embodiment;

fig. 14 is a circuit configuration diagram of a terminal device of the fifth and sixth embodiments.

Detailed Description

The invention will be further described with reference to the drawings and detailed description. The terms such as "upper", "inner", "middle", "left", "right" and "a" and the like recited in the present specification are also for convenience of description only and are not intended to limit the scope of the present invention, but rather to change or adjust the relative relationship thereof, without substantially changing the technical content, and are considered to be within the scope of the present invention.

Examples

A radio frequency transmission system, as shown in fig. 1, includes an output device and a terminal device.

The output device outputs a direct current power supply signal and a radio frequency signal, the control signal is modulated according to the direct current power supply signal, and the direct current power supply signal, the control signal and the radio frequency signal are transmitted to the next-stage device through a coaxial cable in a combining way, and in the embodiment, the signal is transmitted to the terminal device. The invention only directly generates two paths of signals: the direct current power supply signal and the radio frequency signal are different from the prior art that three paths of signals are directly generated: the direct current power supply signal, the control signal and the radio frequency signal have complex circuits fed by three different signals, and occupy large space and have high cost. The invention directly modulates the control signal on the direct-current power supply signal in a switch control mode, reduces the complexity of a circuit, can effectively save the use space, is beneficial to the space utilization and miniaturization of equipment and reduces the cost. The direct current power supply signal, the control signal and the radio frequency signal are transmitted in a combined way, so that the cable layout is simplified, the wiring quantity during equipment connection is greatly reduced, bus connection is not needed between the output equipment and the terminal equipment, and the wiring is simpler.

The terminal equipment receives the direct current power supply signals transmitted by the output equipment and stores the direct current power supply signals to supply power for other active devices, the terminal equipment receives the control signals transmitted by the output equipment and opens corresponding radio frequency channels according to the control signals to allow the received radio frequency signals to pass through, and the radio frequency signals passing through the radio frequency channels are radio frequency signals transmitted by the output equipment and to be transmitted or received back from the outside.

Examples

A radio frequency transmission system, as shown in fig. 2, includes an output device, a radio frequency expander, and a terminal device. The radio frequency amplifier can be at least one stage, namely the radio frequency amplifier can be at least one stage, two stages or more stages in the power supply bearing range according to the actual application requirement.

The output device outputs a direct current power supply signal and a radio frequency signal, and the control signal is modulated according to the direct current power supply signal, namely, the invention only directly generates two paths of signals: the direct current power supply signal and the radio frequency signal are different from the prior art that three paths of signals are directly generated: the direct current power supply signal, the control signal and the radio frequency signal have complex circuits fed by three different signals, and occupy large space and have high cost. The direct current power signal, the control signal and the radio frequency signal are transmitted to the next-stage equipment through the coaxial cable in a combining way, and in the embodiment, the signal is transmitted to the radio frequency amplifier. The invention directly modulates the control signal on the direct-current power supply signal in a switch control mode, reduces the complexity of a circuit, can effectively save the use space, is beneficial to the space utilization and miniaturization of equipment and reduces the cost.

The input end of the radio frequency amplifier receives the direct current power supply signal, the control signal and the radio frequency signal transmitted by the previous-stage equipment, the radio frequency amplifier stores the transmitted direct current power supply signal and provides power for the internal circuit, simultaneously outputs the direct current power supply signal outwards, opens a corresponding radio frequency channel according to the control signal, allows the received radio frequency signal to pass through and transmit, modulates the control signal in a switch control mode according to the direct current power supply signal, and finally, the direct current power supply signal, the control signal and the radio frequency signal are transmitted to the multipath next-stage equipment through the corresponding number of amplifying output ends.

The prior art of branching units adopts a time division multiplexing mode to expand a radio frequency channel, and adopts a bus mode to access a plurality of branching units, but the more connected subordinate devices cannot do time division multiplexing, the higher the power consumption is, the insufficient power supply capability is, the cruising capability of the handheld terminal device is seriously influenced, and the handheld terminal device cannot work for a long time, so that a cable with stronger through-current capability and thicker through-current capability is required, and the wiring is more difficult. According to the invention, through combining and transmitting the direct-current power supply signal, the control signal and the radio frequency signal, the cable layout is simplified, the wiring quantity when equipment is connected with the radio frequency expander is greatly reduced, the radio frequency expander and the radio frequency expander are not required to be connected by a bus, and the multi-stage shunt wiring is simpler.

The terminal equipment receives and stores the direct current power supply signal transmitted by the radio frequency amplifier and supplies power for other active devices, and the terminal equipment receives the control signal transmitted by the radio frequency amplifier and opens a corresponding radio frequency channel according to the control signal to allow the received radio frequency signal to pass through, wherein the radio frequency signal passing through the radio frequency channel is the radio frequency signal which is transmitted by the output equipment and is to be transmitted or the radio frequency signal received back from the outside.

Examples

A radio frequency transmission system, as shown in figure 3, comprises an output device, a radio frequency amplifier and a terminal device. The radio frequency expander is only provided with a first-stage radio frequency expander.

(1) The output device outputs a direct current power supply signal and a radio frequency signal, and the control signal is modulated according to the direct current power supply signal, namely, the invention only directly generates two paths of signals: the direct current power supply signal and the radio frequency signal are different from the prior art that three paths of signals are directly generated: a direct current power signal, a control signal and a radio frequency signal. The direct current power signal, the control signal and the radio frequency signal are transmitted to the next-stage equipment through the coaxial cable in a combining way, and in the embodiment, the signal is transmitted to the radio frequency amplifier.

The specific structure of the output device comprises: the power supply module, the output control module, the output radio frequency module, the pull-up resistor, the suppression filter circuit and the blocking capacitor are shown in fig. 9.

The output power supply module provides power for the output control module and the output radio frequency module, ensures normal work of the output control module and provides direct current power supply signals for next-stage equipment through the output control module. The output power supply module is connected with the output end of the output control module through a pull-up resistor, the pull-up resistor is used for increasing the carrying capacity of the IO port of the output control module and is used for direct current output, otherwise, the carrying capacity of the IO port is insufficient under the condition of a plurality of equipment stages.

The output radio frequency module is used for generating radio frequency signals and analyzing returned radio frequency signals, and the output radio frequency module has the functions of sending communication signals which accord with the application of the module to carry out wireless communication and returning information to the output control module, and the module can be a UHF RFID module, a module applied to a 2.4GHz ISM frequency band, such as Bluetooth, wiFi and the like, and a radio frequency module applied to other frequency bands.

The output control module modulates the direct current power supply signal from the output power supply module in a switch control mode to generate a control signal, namely, the output control module interrupts the output of the direct current power supply signal for a short time according to a certain rule and rule to produce a low level, as shown in fig. 2, a readable control signal can be produced by using the switch control mode, and the control module is preferably an MCU, so that the direct current power supply signal and the control signal are output through an IO port of the output control module.

The output control module is communicated with the output radio frequency module, and is used for controlling the output radio frequency module to send radio frequency signals and analyzing the returned radio frequency signals, and the output control module is used for receiving the returned radio frequency signals.

The output end of the output radio frequency module passes through the blocking capacitor, and the output end of the output control module passes through the suppression filter circuit and then is connected with the input end of the next-stage equipment through the coaxial connector and the coaxial cable. The function of the blocking capacitor is to allow the radio frequency signal to pass, but to block the direct current power supply signal and the digital control signal lower than the low-resistance pass frequency point of the blocking capacitor from passing, the farther the frequency of the digital control signal is from the low-resistance pass frequency point of the blocking capacitor, the greater the attenuation of the blocking capacitor is, so that the blocking capacitor is prevented from interfering an output radio frequency module and generating out-of-band noise. The function of the suppression filter circuit is to suppress and filter the radio frequency signals, prevent the radio frequency signals from interfering the normal work of the MCU through the line, and the suppression circuit is a filter circuit which is built according to the frequency of the radio frequency signals and corresponds to the radio frequency signals, so that only the direct current power supply signals and digital control signals which are far lower than the frequency of the radio frequency signals can pass through. The function of the coaxial connector is to provide an external interface for the rf path for connecting the coaxial cable.

(2) The input end of the radio frequency amplifier receives the direct current power supply signal, the control signal and the radio frequency signal transmitted by the previous-stage equipment, the radio frequency amplifier stores the transmitted direct current power supply signal and provides power for the internal circuit, simultaneously outputs the direct current power supply signal outwards, opens a corresponding radio frequency channel according to the control signal, allows the received radio frequency signal to pass through and transmit, modulates the control signal according to the direct current power supply signal, and finally the direct current power supply signal, the control signal and the radio frequency signal are transmitted to the multipath next-stage equipment through the corresponding number of amplifying output ends.

Specifically, the radio frequency circuit expander comprises a circuit expansion energy storage circuit, a circuit expansion power supply module, a circuit expansion control module and a circuit expansion radio frequency switch, as shown in fig. 10.

The circuit-expanding energy storage circuit receives and stores the direct-current power supply signal transmitted by the previous-stage equipment, and the circuit-expanding energy storage circuit supplies power to the circuit-expanding control module and the circuit-expanding radio frequency switch after the circuit-expanding power supply module regulates and controls the voltage; the circuit-expanding energy storage circuit also provides a direct current power supply signal for the next-stage equipment. The function of the circuit-expanding energy storage circuit is to store enough electric quantity so as to ensure that other circuits and modules cannot work normally due to short interruption of direct current power supply signals by switching modulation of output equipment, and prevent current from flowing out in a countercurrent mode. The function of the extended path power supply module is to provide power for other circuits and modules on the equipment so that the equipment can work normally. The circuit of fig. 7 may be referred to as a circuit of the present invention, where the circuit of the present invention includes a diode and an energy storage capacitor, the positive electrode of the diode receives the dc power signal, the negative electrode of the diode is connected to the energy storage capacitor, and the unidirectional conduction characteristic of the diode and the device or circuit with a switching function are used to prevent the backflow of current caused by temporarily and forcedly pulling down the dc power signal when modulating the digital signal by using the switching modulation method in response to the transmission, and also prevent the failure of forcedly pulling down the dc power signal due to the existence of the energy storage capacitor. The input end of the circuit-expanding energy storage circuit receives the direct current power supply signal transmitted by the previous-stage equipment through the suppression filter circuit, the suppression filter circuit has the functions of suppressing and filtering the radio frequency signal, preventing the radio frequency signal from interfering the normal work of the low-power MCU through the circuit, and the suppression circuit is a filter circuit which is generally built according to the frequency of the radio frequency signal and corresponds to the radio frequency signal, so that only the direct current power supply signal and the digital signal which is far lower than the frequency of the radio frequency signal can pass through.

The switch control mode enables the radio frequency amplifier to independently control the on-off of a power supply, and the time division multiplexing mode is adopted, so that only one shunt terminal device can be provided with the direct current power supply signal to work at the same time, the terminal devices of the other ports do not provide the direct current power supply signal, at the moment, the other ports are in a non-working state, the whole system is guaranteed to be in a running state with lower power consumption, and the situation that in the prior art, more connected lower-level devices and higher power consumption are avoided. The input end of the path expansion control module receives the control signal transmitted by the previous-stage equipment through the suppression filter circuit, and the output end of the path expansion control module outputs a direct current power supply signal and the control signal; the path-expanding control module is preferably a low-power consumption MCU, and has the functions of analyzing a digital control signal sent by the upper-stage equipment and executing related operations according to the content represented by the MCU, such as returning specific parameters and controlling a radio frequency switch, modulating the digital signal by using a switch modulation method to return a response to the upper-stage equipment, providing a direct-current power supply signal to the lower-stage equipment through an IO port and communicating with the lower-stage equipment, and the MCU has lower power consumption.

The channel expansion control module receives a control signal transmitted by the upper-stage equipment, controls the channel expansion radio frequency switch to open a corresponding radio frequency channel according to the control signal, and allows the radio frequency signal to pass through, and an input port of the channel expansion radio frequency switch receives the radio frequency signal transmitted by the upper-stage equipment through the blocking capacitor.

The output end of the path expansion control module passes through the suppression filter circuit and the output port of the path expansion radio frequency switch, and then is combined to pass through the blocking capacitor and then is transmitted to the multipath next-stage equipment through coaxial connectors and coaxial cables by corresponding quantity of path expansion output ends. The function of the suppression filter circuit at the input end and the output end of the path expansion control module is to suppress and filter the radio frequency signals, prevent the radio frequency signals from interfering the normal work of the low-power consumption MCU through the line, and the suppression circuit is a filter circuit which is built according to the frequency of the radio frequency signals and corresponds to the radio frequency signals, so that only the direct current power supply signals and the digital signals which are far lower than the frequency of the radio frequency signals can pass through. The function of the blocking capacitors of the input port and the output port of the spread-spectrum radio frequency switch is to allow radio frequency signals to pass, but the direct current power supply signals and digital signals lower than the low-resistance pass frequency points of the direct current power supply signals are blocked from passing, and the farther the frequency of the digital signals is from the low-resistance pass frequency points of the blocking capacitors, the greater the attenuation of the blocking capacitors is, so that the blocking capacitors are prevented from interfering the radio frequency switch. The function of the coaxial connector is to provide an external interface for the rf path for connecting the coaxial cable.

(3) The terminal equipment receives and stores the direct current power supply signal transmitted by the radio frequency amplifier and supplies power for other active devices, and the terminal equipment receives the control signal transmitted by the radio frequency amplifier and opens a corresponding radio frequency channel according to the control signal to allow the received radio frequency signal to pass through, wherein the radio frequency signal passing through the radio frequency channel is the radio frequency signal which is transmitted by the output equipment and is to be transmitted or the radio frequency signal received back from the outside.

Specifically, the terminal device includes a terminal tank circuit, a terminal control module, a terminal radio frequency switch, and an antenna, as shown in fig. 11.

The terminal energy storage circuit receives and stores the direct current power supply signal transmitted by the radio frequency amplifier and supplies power to the terminal control module; the function of the terminal energy storage circuit is to store enough electric quantity to ensure that other circuits and modules cannot work normally due to short interruption of the direct current power supply signal caused by the modulation control signal of the switch of the output device, and meanwhile, the current can be prevented from flowing out in a countercurrent mode. The input end of the terminal energy storage circuit receives and stores the direct current power supply signal transmitted by the previous-stage equipment through the suppression filter circuit, the suppression filter circuit has the functions of suppressing and filtering the radio frequency signal, preventing the radio frequency signal from interfering the normal work of the low-power MCU through a circuit, and the suppression circuit is a filter circuit which is generally built according to the frequency of the radio frequency signal and corresponds to the radio frequency signal, so that only the direct current power supply signal and the digital signal which is far lower than the frequency of the radio frequency signal can pass. The terminal energy storage circuit can refer to the circuit of fig. 7, the circuit expansion energy storage circuit comprises a diode and an energy storage capacitor, the anode of the diode receives a direct current power supply signal, and the cathode of the diode is connected with the energy storage capacitor.

The terminal control module receives the control signal transmitted by the previous-stage equipment, and controls the terminal radio frequency switch to open a corresponding radio frequency channel according to the control signal so as to allow the radio frequency signal to pass through. The terminal control module is preferably a low-power consumption MCU, and has the functions of analyzing the digital signals sent by the upper-stage equipment and executing related operations according to the content represented by the MCU, such as returning specific parameters and controlling a radio frequency switch, modulating the digital signals by using a switch modulation method to return a response to the upper-stage equipment, providing a direct-current power supply signal to the lower-stage equipment through an IO port and communicating with the lower-stage equipment, and the MCU has lower type-selection power consumption. The input end of the terminal control module receives the control signal transmitted by the previous-stage equipment through the suppression filter circuit, the suppression filter circuit has the functions of suppressing and filtering the radio frequency signal, preventing the radio frequency signal from interfering the normal work of the low-power MCU through a line, and the suppression circuit is a filter circuit which is generally built according to the frequency of the radio frequency signal and corresponds to the radio frequency signal, so that only a direct-current power supply signal and a digital signal which is far lower than the frequency of the radio frequency signal can pass.

An input port of a terminal radio frequency switch receives radio frequency signals transmitted by the previous-stage equipment through a blocking capacitor, and each output port of the radio frequency switch is connected with an antenna, and the antenna transmits or receives the radio frequency signals; the antenna functions to radiate out radio frequency signals and receive electromagnetic waves, and convert the electromagnetic waves into radio frequency signals for transmission.

The terminal equipment and the radio frequency amplifier modulate the direct current power supply signal transmitted by the upper-stage equipment into a response signal, the response signal is sent to the upper-stage equipment, and the upper-stage equipment receives the response signal through an IO port of the control module. In this embodiment, the terminal device sends a response signal to the radio frequency expander, and the radio frequency expander sends the response signal to the output device.

The output device of the embodiment is connected with the radio frequency expander through the coaxial cable, each output port of the radio frequency expander is connected with the terminal device through the coaxial cable, the output device provides a required direct current power supply signal for the radio frequency expander through the coaxial cable to ensure the normal operation of the output device, meanwhile, the direct current power supply signal is modulated by a switch modulation method to send a control signal to the radio frequency expander, the radio frequency expander opens a radio frequency channel to transmit radio frequency signals according to the control signal, the direct current power supply signal is provided for the terminal device through the coaxial cable and is modulated by the control signal to be sent to the terminal device, the terminal device also modulates the direct current power supply signal to return a response in a switch modulation mode after executing the control signal, the radio frequency expander returns a response signal to the output device through the switch modulation method after receiving the response, and the output device sends the radio frequency signals to radiate through an antenna corresponding to the terminal antenna device after receiving the response. The radio frequency circuit expander only provides a direct current power supply signal for one terminal device at the same time according to the control instruction to enable the terminal device to work, the terminal devices of the other ports do not provide the direct current power supply signal, at the moment, the other ports are in a non-working state, the whole system is ensured to be in a running state with lower power consumption, and the radio frequency circuit expander is suitable for application scenes with low power consumption and small current. The communication time sequences of the output device, the radio frequency expander and the terminal device all adopt a time division multiplexing mode, and as shown in fig. 8, the modulated digital signal can be sent after the direct current power supply signal is charged for a period of time, the modulated digital signal is returned after the next-stage device executes the operation after the continuous charging for a period of time after the sending is completed, and the previous-stage device continues to provide the charging and waits for the next communication.

The radio frequency expander of the embodiment provides 6 radio frequency channels, the terminal equipment provides 12 radio frequency channels to be connected with 12 antennas, 72 radio frequency channels are expanded in total, 72 antennas are connected, and the expansion number can be adjusted according to the actual application requirement.

The embodiment is suitable for the application scene of low power consumption and small current, and the complexity of a circuit is reduced by directly modulating the control signal on the direct current power supply signal, so that the use space can be effectively saved, the space utilization and miniaturization of equipment are facilitated, and the cost is reduced. The direct current power supply signal, the control signal and the radio frequency signal are transmitted in a combined way, so that the cable layout is simplified, the wiring quantity when equipment is connected with the radio frequency expander is greatly reduced, the bus connection is not needed between the radio frequency expander and the radio frequency expander, and the multi-stage shunt wiring is simpler. The power supply is independently controllable, and only provides direct current power supply signals for one shunt terminal device at the same time to enable the shunt terminal device to work, so that the power consumption is low. The system of the embodiment can effectively save wiring among the output equipment, the radio frequency expander and the terminal equipment, and simultaneously ensure that the circuit can normally acquire power supply and communicate with each other according to the rule of time division multiplexing under the condition that only one coaxial cable is arranged, is very critical for the application of expanding the radio frequency channel by using a plurality of radio frequency switches, can reduce wiring difficulty and space, greatly reduces power consumption, is beneficial to long-time work of the portable output equipment, and increases endurance time.

Examples

The radio frequency transmission system of the embodiment, based on the third embodiment, is added with a first-stage radio frequency expander to expand more branches, as shown in fig. 4, and includes an output device, a first-stage radio frequency expander, a second-stage radio frequency expander and a terminal device. The primary radio frequency expander of the embodiment provides 6 radio frequency channels, the secondary radio frequency expander provides 6 radio frequency channels, the terminal equipment provides 12 radio frequency channels and is connected with 12 antennas, 432 radio frequency channels are expanded in total, 432 antennas are connected, and the number of the expansion channels can be adjusted according to the actual application requirement. The embodiment is also suitable for application scenes with low power consumption and low current, can effectively save power consumption, and can well control the power consumption even if a plurality of radio frequency expanders or multi-stage branching circuits are connected.

Examples

A radio frequency transmission system, as shown in fig. 5, includes an output device and a terminal device.

(1) The output device outputs a direct current power supply signal and a radio frequency signal, namely, the invention only directly generates two paths of signals: the direct current power supply signal and the radio frequency signal are different from the prior art that three paths of signals are directly generated: a direct current power signal, a control signal and a radio frequency signal. The control signal of the invention is modulated according to the DC power signal, and then the DC power signal, the control signal and the radio frequency signal are transmitted to the next-stage equipment through the coaxial cable in a combining way, and in the embodiment, the signal is transmitted to the terminal equipment.

The specific structure of the output device comprises: the output power module, the output control module, the output radio frequency module, the output field effect transistor, the output radio frequency switch, the suppression filter circuit and the blocking capacitor are shown in fig. 12.

The output power supply module provides power for the output control module and the output radio frequency module, and provides direct current power supply signals for next-stage equipment through the output field effect transistor.

The output radio frequency module is used for generating radio frequency signals; the output end of the output radio frequency module is connected with the input end of the output radio frequency switch, the output radio frequency switch is provided with at least one output port, one output port is arranged under the condition that the path expansion is not needed, and a plurality of output ports are needed under the condition that the path expansion is needed. When the circuit expansion is not needed, an output radio frequency switch is not needed, and the radio frequency signal is directly output from the output radio frequency module and transmitted to the next-stage equipment. The output radio frequency module is used for transmitting communication signals which accord with the application of the module to carry out wireless communication and returning information to the output control module, and the module can be a UHF RFID module, a module applied to a 2.4GHz ISM frequency band, such as Bluetooth, wiFi and the like, or a radio frequency module applied to other frequency bands;

The output control module modulates the direct current power supply signal of the output power supply module to generate a control signal in a switch control mode, communicates with the output radio frequency module, controls the signal receiving and transmitting of the output radio frequency module and the channel switching of the radio frequency switch, and outputs or interrupts the direct current power supply signal through the control field effect transistor, namely the output control module interrupts the output of the direct current power supply signal of the output power supply module in a short time according to a certain rule and law to manufacture a low level, as shown in fig. 8, a readable control signal can be manufactured by utilizing the switch control mode, and the control module is preferably an MCU.

When the control module MCU is required to be applied to a scene of transmitting high-amount current, a regulation device is required to be added at the output end of the output power module, such as a field effect transistor, because the current capability output by the control module MCU is very weak and large current cannot be output to meet the scene of transmitting high-amount current. The output end of the output power supply module is connected with the input end of the output field effect tube, the output end of the output control module is connected with the control end of the output field effect tube, the MCU of the output control module controls the on and off of the output field effect tube, and the output end of the output field effect tube outputs a direct current power supply signal and a control signal. The output field effect transistor has the function of a switch in the transmission of a direct current power supply signal, and is directly arranged at the output end of the output power supply module, and the switch is controlled by the output control module, so that the output device can output high-amount current, and the output device is suitable for lower-level equipment and terminal equipment with higher power consumption.

The output end of the output field effect tube passes through the suppression filter circuit, and the output end of the output radio frequency switch passes through the blocking capacitor and then is connected with the input end of the next-stage equipment through the coaxial connector and the coaxial cable in a combining way. The function of the suppression filter circuit is to suppress and filter the radio frequency signals, prevent the radio frequency signals from interfering the normal work of the power supply module through the circuit, and further influence other circuits connected with the power supply module to be influenced. The function of the blocking capacitor is to let the radio frequency signal pass, but to block the direct current power supply signal and the digital signal lower than the low-resistance pass frequency point, the farther the frequency of the digital signal is from the low-resistance pass frequency point of the blocking capacitor, the greater the attenuation of the blocking capacitor to the blocking capacitor, so as to prevent the blocking capacitor from interfering the radio frequency circuit. The function of the coaxial connector is to provide an external interface for the radio frequency channel, and meanwhile, a connector with a proper model is required to be selected for connecting the coaxial cable according to the power consumption of the terminal equipment.

(2) The terminal equipment receives and stores the direct current power supply signal transmitted by the radio frequency amplifier and supplies power for other active devices, and the terminal equipment receives the control signal transmitted by the radio frequency amplifier and opens a corresponding radio frequency channel according to the control signal to allow the received radio frequency signal to pass through, wherein the radio frequency signal passing through the radio frequency channel is the radio frequency signal which is transmitted by the output equipment and is to be transmitted or the radio frequency signal received back from the outside.

Specifically, the terminal device includes a terminal tank circuit, a terminal control module, a terminal radio frequency switch, and an antenna, as shown in fig. 14.

The terminal energy storage circuit receives and stores the direct current power supply signal transmitted by the previous-stage equipment, and the terminal energy storage circuit supplies power to the terminal control module after regulating and controlling the voltage by the terminal power supply module. The function of the terminal energy storage circuit is to store enough electric quantity to ensure that other circuits and modules cannot work normally due to short interruption of direct current power supply signals modulated by the switch of the output equipment, and the function of the terminal power supply module is to provide power for other circuits and modules on the equipment so that the other circuits and modules can work normally. The terminal energy storage circuit can refer to the circuit of fig. 7, the circuit expansion energy storage circuit comprises a diode and an energy storage capacitor, the anode of the diode receives a direct current power supply signal, and the cathode of the diode is connected with the energy storage capacitor. The input end of the terminal energy storage circuit receives and stores the direct current power supply signal transmitted by the previous-stage equipment through the suppression filter circuit; the function of the suppression filter circuit is to suppress and filter the radio frequency signals, prevent the radio frequency signals from interfering the normal work of the digital circuit through the circuit, and the suppression circuit is a filter circuit which is built according to the frequency of the radio frequency signals and corresponds to the radio frequency signals, so that only the direct current power supply signals and the digital signals which are far lower than the frequency of the radio frequency signals can pass through.

The terminal control module receives the control signal transmitted by the output equipment, and controls the terminal radio frequency switch to open a corresponding radio frequency channel according to the control signal so as to allow the radio frequency signal to pass through; the terminal control module is preferably an MCU. The input end of the terminal control module sequentially receives the control signals transmitted by the output equipment through the suppression filter circuit and the level conversion circuit. The function of the suppression filter circuit is to suppress and filter the radio frequency signals, prevent the radio frequency signals from interfering with the normal operation of the digital circuit through the circuit, and the suppression circuit is a filter circuit which is built according to the frequency of the radio frequency signals and corresponds to the radio frequency signals, so that only the direct current power supply signals and the digital signals which are far lower than the frequency of the radio frequency signals can pass through; the function of the level conversion circuit converts the level of the digital control signal sent from the previous-stage device into a proper level, otherwise, the excessive level can damage the IO port of the MCU.

The input port of the terminal radio frequency switch receives the radio frequency signal transmitted by the upper output device through the blocking capacitor; each output port of the radio frequency switch is connected with an antenna, and the antenna transmits or receives radio frequency signals. The function of the blocking capacitor is to let the radio frequency signal pass, but to block the direct current power supply signal and the digital control signal lower than the low-resistance pass frequency point of the blocking capacitor from passing, the farther the frequency of the digital control signal is from the low-resistance pass frequency point of the blocking capacitor, the greater the attenuation of the blocking capacitor is, so that the blocking capacitor is prevented from interfering the radio frequency switch. The antenna functions to radiate out radio frequency signals and receive electromagnetic waves, and convert the electromagnetic waves into radio frequency signals for transmission.

Further, the output end of the terminal control module is also sequentially connected with a motor driving circuit and a motor, the terminal power supply module provides electric energy for the motor driving circuit, the motor driving circuit outputs driving current and signals to control the operation of the motor according to the instruction of the terminal control module, the motor performs forward rotation and reverse rotation and other operations according to the driving of the motor driving module, and the motor can drive the conveyor belt or a corresponding mechanical structure to move according to actual needs. For example: the article with the RFID passive tag can be placed on the conveyor belt, the radio frequency signal of the RFID passive tag is received through the antenna on the terminal equipment, and is transmitted to the output equipment, and the output equipment analyzes and identifies the radio frequency signal. Therefore, each conveyor belt is provided with an antenna, can conveniently read article information, is suitable for systems such as luggage consignment and the like, and realizes the functions of automatic identification, classification, tracking, monitoring and the like of articles.

The radio frequency transmission system in the embodiment provides 4 radio frequency ports, can be connected with 4 terminal devices, expands 24 radio frequency channels to be connected with 24 antennae, and can also adjust the number of the expansion channels according to the actual application requirement.

The embodiment provides a radio frequency transmission system which effectively saves layout difficulty for application scenes requiring radio frequency circuit expansion and high-volume current transmission, high-volume current, radio frequency signals and digital control signals can be transmitted through coaxial cables without additional connecting cables, and each terminal device can be independently controlled, so that overall power consumption is controllable and distributed, and power consumption is lower.

Examples

Compared with the fifth embodiment, the present embodiment has more one-stage rf expanders, as shown in fig. 6.

A radio frequency transmission system comprises an output device, a radio frequency expander and a terminal device.

The output device outputs a direct current power supply signal and a radio frequency signal, and the control signal is modulated according to the direct current power supply signal, namely, the invention only directly generates two paths of signals: the direct current power supply signal and the radio frequency signal are different from the prior art that three paths of signals are directly generated: a direct current power signal, a control signal and a radio frequency signal. The direct current power signal, the control signal and the radio frequency signal are transmitted to the next-stage equipment through the coaxial cable in a combining way, and in the embodiment, the signal is transmitted to the radio frequency amplifier. The invention directly modulates the control signal on the direct-current power supply signal, reduces the complexity of the circuit, can effectively save the use space, is beneficial to the space utilization and miniaturization of equipment and reduces the cost.

The input end of the radio frequency amplifier receives the direct current power supply signal, the control signal and the radio frequency signal transmitted by the previous-stage equipment, the radio frequency amplifier stores the transmitted direct current power supply signal and provides power for the internal circuit, simultaneously outputs the direct current power supply signal outwards, opens a corresponding radio frequency channel according to the control signal, allows the received radio frequency signal to pass through and transmit, modulates the control signal according to the direct current power supply signal, and finally the direct current power supply signal, the control signal and the radio frequency signal are transmitted to the multi-channel terminal equipment through the corresponding number of amplifying output ends.

The direct current power supply signal, the control signal and the radio frequency signal are transmitted in a combined way, so that the cable layout is simplified, the wiring quantity when equipment is connected with the radio frequency expander is greatly reduced, the bus connection is not needed between the radio frequency expander and the radio frequency expander, and the multi-stage shunt wiring is simpler.

The structures of the output device and the terminal device are the same as those of the fifth embodiment.

The radio frequency circuit expander comprises a circuit expanding energy storage circuit, a circuit expanding power supply module, a circuit expanding control module and a circuit expanding radio frequency switch, as shown in fig. 13.

The circuit-expanding energy storage circuit receives and stores the direct current power supply signal transmitted by the previous-stage equipment, and provides power for the circuit-expanding control module and the circuit-expanding radio frequency switch after the voltage is regulated by the circuit-expanding power supply module, and provides the direct current power supply signal for the next-stage equipment through the circuit-expanding field effect transistor. The function of the circuit-expanding energy storage circuit is to store enough electric quantity so as to ensure that other circuits and modules cannot work normally due to the fact that the output equipment temporarily interrupts the direct-current power supply signal due to switch modulation, and meanwhile, the circuit can be prevented from flowing out in a countercurrent mode. The function of the extended path power supply module is to provide power for other circuits and modules on the equipment so that the equipment can work normally. The circuit of fig. 7 may be referred to as a circuit of the present invention, where the circuit of the present invention includes a diode and an energy storage capacitor, the positive electrode of the diode receives the dc power signal, the negative electrode of the diode is connected to the energy storage capacitor, and the unidirectional conduction characteristic of the diode and the device or circuit with a switching function are used to prevent the backflow of current caused by temporarily and forcedly pulling down the dc power signal when modulating the digital signal by using the switching modulation method in response to the transmission, and also prevent the failure of forcedly pulling down the dc power signal due to the existence of the energy storage capacitor. The input end of the circuit-expanding energy storage circuit receives the direct current power supply signal transmitted by the previous-stage equipment through the suppression filter circuit, the suppression filter circuit has the functions of suppressing and filtering the radio frequency signal and preventing the radio frequency signal from interfering the normal work of the MCU through the circuit, and the suppression circuit is a filter circuit which is generally built according to the frequency of the radio frequency signal and corresponds to the radio frequency signal, so that only the direct current power supply signal and the digital control signal which is far lower than the frequency of the radio frequency signal can pass.

The path expansion control module modulates the direct current power supply signal of the path expansion power supply module to generate a control signal in a switch modulation mode, and transmits the control signal to the terminal equipment. The input end of the path expansion control module sequentially receives control signals transmitted by the previous-stage equipment through the suppression filter circuit and the level conversion circuit; the road expansion control module is preferably an MCU. The circuit-expanding control module is used for manufacturing a low level by controlling the output of the field effect transistor or interrupting the transmission of the direct current power supply signal, namely the circuit-expanding control module is used for manufacturing a readable control signal by controlling the output of the direct current power supply signal of the circuit-expanding power supply module by the field effect transistor according to a certain rule and a certain rule for a short time, as shown in fig. 8, by using the switch control mode; meanwhile, the switch control mode enables the radio frequency amplifier to independently control the on-off of a power supply, and in addition, a time division multiplexing mode is adopted, only a direct current power supply signal is provided for one branched terminal device at the same time to enable the terminal device to work, the terminal devices of the other ports do not provide the direct current power supply signal, at the moment, the other ports are in a non-working state, the whole system is ensured to be in an operation state with lower power consumption, and the situation that the more connected subordinate devices are in the prior art and the higher power consumption is avoided.

When the control module MCU is required to be applied to a scene of transmitting high-amount current, a regulation device is required to be added at the output end of the output power module, such as a field effect transistor, because the current capability output by the control module MCU is very weak and large current cannot be output to meet the scene of transmitting high-amount current. The output end of the road expansion power supply module is connected with the input end of the road expansion field effect tube, the output end of the road expansion control module is connected with the control end of the road expansion field effect tube, the road expansion control module MCU controls the on and off of the road expansion field effect tube, and the output end of the road expansion field effect tube outputs a direct current power supply signal and a control signal. The function of the channel-expanding field effect transistor is to play a role of a switch in the transmission of direct-current power supply signals, and the channel-expanding control module is used for controlling the switch or the switch by directly arranging at the output end of the channel-expanding power supply module, so that the radio-frequency channel expander can output high-amount current, and is suitable for lower-level equipment and terminal equipment with higher power consumption.

The channel expansion control module receives the control signal transmitted by the output device, controls the channel expansion radio frequency switch to open a corresponding radio frequency channel according to the control signal, and allows the radio frequency signal to pass through, and an input port of the channel expansion radio frequency switch receives the radio frequency signal transmitted by the previous-stage device through the blocking capacitor. The function of the blocking capacitor is to let the radio frequency signal pass, but to block the direct current power supply signal and the digital signal lower than the low-resistance pass frequency point, the farther the frequency of the digital signal is from the low-resistance pass frequency point of the blocking capacitor, the greater the attenuation of the blocking capacitor to the blocking capacitor, so as to prevent the blocking capacitor from interfering the radio frequency circuit.

The output ends of the extended-path field effect tubes pass through the suppression filter circuit and the output ports of the extended-path radio frequency switch and then are combined to pass through the blocking capacitors, and the corresponding number of extended-path output ends are transmitted to the multipath next-stage equipment through the coaxial connectors and the coaxial cables. The function of the suppression filter circuit at the input end and the output end of the path expansion control module is to suppress and filter the radio frequency signals, prevent the radio frequency signals from interfering the normal work of the low-power consumption MCU through the line, and the suppression circuit is a filter circuit which is built according to the frequency of the radio frequency signals and corresponds to the radio frequency signals, so that only the direct current power supply signals and the digital signals which are far lower than the frequency of the radio frequency signals can pass through. The function of the blocking capacitors of the input port and the output port of the spread-spectrum radio frequency switch is to allow radio frequency signals to pass, but the direct current power supply signals and digital signals lower than the low-resistance pass frequency points of the direct current power supply signals are blocked from passing, and the farther the frequency of the digital signals is from the low-resistance pass frequency points of the blocking capacitors, the greater the attenuation of the blocking capacitors is, so that the blocking capacitors are prevented from interfering the radio frequency switch. The function of the coaxial connector is to provide an external interface for the rf path for connecting the coaxial cable.

The output device of the embodiment provides 4 radio frequency channels, the radio frequency expander provides 4 radio frequency channels, the terminal device provides 6 radio frequency channels and is connected with 6 antennas, 96 radio frequency channels are expanded in total, 96 antennas are connected, and the expansion number can be adjusted according to the actual application requirement.

The embodiment provides a radio frequency transmission system which effectively saves layout difficulty for application scenes requiring radio frequency circuit expansion and high-volume current transmission, high-volume current, radio frequency signals and digital control signals can be transmitted through coaxial cables without additional connecting cables, and each radio frequency circuit expander and each terminal device can be independently controlled, so that overall power consumption can be controlled and distributed, power consumption can be effectively saved, and even if a plurality of radio frequency circuit expanders or multi-stage shunt power consumption are connected, the power consumption can be well controlled.

Examples

A radio frequency transmission method comprising the steps of:

Outputting a direct current power supply signal and a radio frequency signal;

The transmission method of the invention only directly generates two paths of signals: the direct current power supply signal and the radio frequency signal are different from the prior art that three paths of signals are directly generated: the direct current power supply signal, the control signal and the radio frequency signal have complex circuits fed by three different signals, and occupy large space and have high cost. The invention directly modulates the control signal on the direct-current power supply signal in a switch control mode, reduces the complexity of a circuit, can effectively save the use space, is beneficial to the space utilization and miniaturization of equipment and reduces the cost. The direct current power supply signal, the control signal and the radio frequency signal are transmitted in a combined way, so that the cable layout is simplified, the wiring quantity during equipment connection is greatly reduced, bus connection is not needed between the output equipment and the terminal equipment, and the wiring is simpler.

Further, when the extended split multi-band load is required, the radio frequency transmission method comprises the following steps:

Outputting a direct current power supply signal and a radio frequency signal;

Receiving a direct current power supply signal, a control signal and a radio frequency signal transmitted by the upper-stage equipment, storing the transmitted direct current power supply signal and providing power for an internal circuit, simultaneously outputting the direct current power supply signal outwards, opening a corresponding radio frequency channel according to the control signal, allowing the received radio frequency signal to pass through and transmit, modulating the direct current power supply signal in a switch control mode to generate the control signal, and outputting the direct current power supply signal, the modulated control signal and the radio frequency signal to the multipath lower-stage equipment in a time division multiplexing mode through a corresponding number of spreading ends;

The terminal receives a direct current power supply signal transmitted by the previous-stage equipment and stores and supplies power;

The terminal receives the control signal transmitted by the previous-stage equipment and opens a corresponding radio frequency channel according to the control signal, so that the radio frequency signal can pass through and be transmitted or received.

The invention utilizes a switch control mode to manufacture control signals, and simultaneously the switch control mode enables the radio frequency circuit expander to independently control the on-off of a power supply, and adopts a time division multiplexing mode, so that only one branched terminal device can be provided with a direct current power supply signal at the same time to work, the terminal devices of the other ports do not provide the direct current power supply signal, at the moment, the other ports are in a non-working state, the whole system is ensured to be in a running state with lower power consumption, the situation that the more lower-level devices are connected and the higher power consumption is caused in the prior art is avoided, the power consumption can be effectively saved, and the power consumption can be well controlled even if a plurality of radio frequency circuit expanders or multi-stage branching power consumption are connected.

The embodiments of the present invention are not limited thereto, and the present invention may be modified, substituted or combined in various other forms without departing from the basic technical spirit of the present invention, which falls within the scope of the claims, according to the above-described aspects of the present invention, using the general knowledge and conventional means of the art.

Claims

1. A radio frequency transmission system, characterized by: comprises an output device and a terminal device;

The terminal equipment receives the direct current power supply signal transmitted by the previous-stage equipment, stores and supplies power, receives the control signal transmitted by the previous-stage equipment, and opens a corresponding radio frequency channel according to the control signal so as to allow the received radio frequency signal to pass and transmit;

The multi-channel multi-stage radio frequency amplifier further comprises at least one stage of radio frequency amplifier for outputting signals step by step, wherein the input end of the radio frequency amplifier receives direct current power supply signals, control signals and radio frequency signals transmitted by the previous stage of equipment, the radio frequency amplifier outputs the direct current power supply signals and the radio frequency signals, the control signals are modulated according to the direct current power supply signals, and the direct current power supply signals, the control signals and the radio frequency signals are transmitted to the multi-channel next stage of equipment through the corresponding number of amplifying output ends.

2. The radio frequency transmission system according to claim 1, wherein: the output equipment comprises an output power supply module, an output control module and an output radio frequency module;

3. The radio frequency transmission system according to claim 1, wherein: the radio frequency circuit expander comprises a circuit expanding energy storage circuit, a circuit expanding power supply module, a circuit expanding control module and a circuit expanding radio frequency switch;

4. The radio frequency transmission system according to claim 1, wherein: the terminal equipment comprises a terminal energy storage circuit, a terminal control module, a terminal radio frequency switch and an antenna;

5. The radio frequency transmission system according to claim 2, wherein: the output device comprises a pull-up resistor, a suppression filter circuit and a blocking capacitor;

6. The radio frequency transmission system according to claim 2, wherein: the output equipment comprises an output field effect transistor, an output radio frequency switch, a suppression filter circuit and a blocking capacitor;

7. A radio frequency transmission system according to claim 3, characterized in that:

the input end of the circuit-expanding energy storage circuit receives a direct-current power supply signal transmitted by the previous-stage equipment through the suppression filter circuit;

8. A radio frequency transmission system according to claim 3, characterized in that:

9. The radio frequency transmission system according to claim 4, wherein:

the input end of the terminal energy storage circuit receives and stores a direct current power supply signal transmitted by the previous-stage equipment through the suppression filter circuit;

10. The radio frequency transmission system according to claim 4, wherein:

the input end of the terminal energy storage circuit receives and stores a direct current power supply signal transmitted by the previous-stage equipment through the suppression filter circuit, and the direct current power supply signal is supplied to the terminal control module after voltage regulation and control of the terminal power supply module;

11. The radio frequency transmission system according to claim 1, wherein: the terminal equipment and the radio frequency amplifier modulate the direct current power supply signal transmitted by the upper-level equipment into a response signal, and send the response signal to the upper-level equipment.

12. A radio frequency transmission method, comprising the steps of:

Outputting a direct current power supply signal and a radio frequency signal;