WO2017113369A1

WO2017113369A1 - Signal transmission circuit, and tuned antenna

Info

Publication number: WO2017113369A1
Application number: PCT/CN2015/100285
Authority: WO
Inventors: 朱胜
Original assignee: 华为技术有限公司
Priority date: 2015-12-31
Filing date: 2015-12-31
Publication date: 2017-07-06
Also published as: CN107431497A; CN107431497B

Abstract

Disclosed in embodiments of the invention are a signal transmission circuit and a tuned antenna. The signal transmission circuit comprises: a radio frequency transceiver circuit connected to a first end of a radio frequency cable and used to transmit and receive a radio frequency signal; a tuning circuit connected to a second end of the radio frequency cable and used to control, according to a received control signal, a tuning device to perform tuning; an output control circuit connected to the first end of the radio frequency cable and used to superimpose a control signal and a power source signal onto a radio frequency signal to be transmitted by the radio frequency transceiver circuit, wherein the control signal is configured based on a serial communication protocol and contains control command information and address information of a tuning device in the tuning circuit; and an input control circuit having an input end connected to the second end of the radio frequency cable and an output end connected to the tuning circuit, and used to separate a control signal, a power source signal and a radio frequency signal mixed together and to transmit the separated power source signal and control signal to the tuning circuit. The invention enables reduction of complexity and costs of the tuned antenna, and control of a plurality of tuning devices to perform tuning.

Description

Signal transmission circuit and tuned antenna

Technical field

The present invention relates to the field of communications technologies, and in particular, to a signal transmission circuit and a tuned antenna.

Background technique

A tuned antenna is an antenna that has a predetermined frequency band only in a very narrow frequency band. Generally, the tuned antenna is only rational in the 5% band near its tuned frequency. It is widely used in ground, onboard, shipboard and aeronautical shortwave radios.

In the prior art, the control of the tuned antenna generally adopts the Mobile Industry Processor Interface (MIPI) scheme. For an external tuned antenna like a vehicle, the tuned antenna and the mainboard control system are not directly connected. If you want to control the tuning antenna, you need to add additional control signal lines to transmit the control signal, which will increase the complexity and cost of tuning the antenna.

Summary of the invention

It is an object of the present invention to provide a signal transmission circuit and a tuned antenna. To solve the problem of tuning the antenna complexity and cost.

In a first aspect, an embodiment of the present invention provides a signal transmission circuit, including:

The radio frequency transceiver circuit is connected to the first end of the radio frequency cable for transmitting and receiving radio frequency signals;

a tuning circuit connected to the second end of the RF cable for controlling the tuning device to perform tuning according to the received control signal;

An output control circuit is connected to the first end of the radio frequency cable, and is configured to superimpose a control signal and a power source on the radio frequency signal sent by the radio frequency transceiver circuit, where the control signal is configured according to a serial communication protocol, and includes a control command. Information and address information of the tuning device in the tuning circuit;

An input control circuit having an input end connected to the second end of the radio frequency cable, and an output end connected to the tuning circuit for separating the mixed control signal, the power supply and the radio frequency signal, and separating the separated power supply and A control signal is transmitted to the tuning circuit.

Transmitting RF signals through RF cables, transmitting power and control signals, reducing signal lines The number reduces the complexity and cost of tuning the antenna assembly; and the control signal is based on a serial communication protocol configuration, including control command information and address information of the tuning device in the tuning circuit, so that it can transmit both control command information and transmission tuning. The address information of the device, when the tuning circuit has multiple tuning devices, can simultaneously transmit several pieces of address information and control information corresponding to the address information, thereby realizing control of multiple tuning devices, making the antenna system more efficient At the same time, because the bandwidth requirements of the tuning device controlling the antenna are very low, the excess bandwidth can be reused for other device communication such as for audio communication, transmission of audio data, and the like.

With reference to the first aspect, in a first implementation manner of the first aspect, the output control circuit includes a comparator, a first resistor, a second resistor, a third resistor, and an adjustable resistor, and the opposite input end of the comparator Connected to the radio frequency transceiver circuit by the first resistor, the power source is connected to the non-inverting input end of the comparator through the second resistor, and the control signal is connected to the comparator through the third resistor To the input end, the adjustable resistor is connected between the output of the comparator and the inverting input of the comparator, and the output of the comparator passes through the first inductor and the first of the RF cable Connected at one end.

The power supply and the control signal are superimposed by the comparator, and the circuit structure is simple, the cost is low, and the stability is high.

With reference to the first aspect or the first implementation of the first aspect, in the second implementation of the first aspect, the input control circuit includes a power converter, a capacitor, and a flip-flop, and the input end of the power converter passes a second inductor is coupled to the second end of the RF cable, an output of the power converter is coupled to the tuning circuit, one end of the capacitor is coupled to an input of the power converter, and the other end is coupled to the A first input of the flip-flop, a second output of the flip-flop is coupled to an output of the power converter, and an output of the flip-flop is coupled to the tuning circuit.

The power supply and the control signal are separated by the power converter, the capacitor and the flip-flop, and the circuit structure is simple and the cost is low.

With reference to the second implementation manner of the first aspect, in the third implementation manner of the first aspect, the radio frequency transceiver circuit includes a radio frequency switch and at least two frequency band transceiver channels, and the at least two frequency band transceiver channels respectively and the radio frequency a switch connection, wherein the RF switch is connected to the opposite end of the comparator through the first resistor To the input.

With reference to the third implementation of the first aspect, in a fourth implementation manner of the first aspect, the tuning circuit includes at least two tuning devices having the same number of the transceiver channels as the frequency band, and the at least two tuning devices are connected in series One end is connected to the second end of the RF cable, and the other end is connected to the antenna radiating unit. The at least two tuning devices are respectively connected to the output end of the trigger and the output end of the power converter.

With reference to the fourth implementation manner of the first aspect, in the fifth implementation manner of the first aspect, the signal transmission circuit further includes:

And an audio transmission control circuit, wherein a first output end of the audio transmission control circuit is connected to an output end of the flip-flop, and a second output end of the audio transmission control circuit is connected to an output end of the power converter.

Since the bandwidth requirements for controlling the antenna tuning device are low, the excess bandwidth can be reused for audio communication, improving bandwidth utilization.

In conjunction with the first aspect or in combination with any of the first to fourth implementations of the first aspect, in the sixth implementation of the first aspect, the control signal is a low frequency digital signal.

Since the frequency of the low frequency digital signal is very low, and the GHz level of the radio frequency signal is several orders of magnitude different, the interference to the radio frequency signal is negligible.

In a second aspect, an embodiment of the present invention provides a tuned antenna, including:

An antenna radiating element for receiving and transmitting signals;

A signal transmission circuit according to the first aspect of the present invention or the implementation of any of the first aspect.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative work.

1 is a schematic structural diagram of a signal transmission circuit according to an embodiment of the present invention;

2 is a schematic circuit diagram of a signal transmission circuit according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a tuned antenna according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Please refer to FIG. 1 , which is a schematic diagram of a composition of a signal transmission circuit according to an embodiment of the present invention. In this embodiment, the signal transmission circuit 100 includes:

The RF transceiver circuit 10 is connected to the first end of the RF cable for transmitting and receiving radio frequency signals;

The tuning circuit 20 is connected to the second end of the radio frequency cable, and is configured to control the tuning device to perform tuning according to the received control signal;

An output control circuit 30 is connected to the first end of the radio frequency cable for superimposing a control signal and a power source on the radio frequency signal sent by the radio frequency transceiver circuit 10, where the control signal is configured based on a serial communication protocol, and includes Controlling command information and address information of the tuning device in the tuning circuit;

An input control circuit 40 having an input end connected to the second end of the radio frequency cable, and an output end connected to the tuning circuit 20 for separating the mixed control signal, the power supply and the radio frequency signal, and separating the separated Power and control signals are transmitted to the tuning circuit 20.

As shown in FIG. 1, the radio frequency cable between the radio frequency transceiver circuit 10 and the tuning circuit 20 is indicated by a thick line, and the arrows in the figure are used to indicate the flow direction of the signal.

The radio frequency cable is only used to transmit the radio frequency signal. In this embodiment, the output control circuit is connected to the first end of the radio frequency cable, that is, the end of the radio frequency cable close to the radio frequency transceiver circuit, and the control signal and the power supply are superimposed. The RF cable is connected to the RF cable to transmit both RF signals and control signals and power. The control signals herein are used to control the tuning device in tuning circuit 20 for tuning.

Wherein, the output control circuit 30 can superimpose the control signal on the power supply and then superimpose it on the radio frequency. On the signal, the control signal and the power supply may be superimposed on the radio frequency signal, which is not limited in the embodiment of the present invention. When the method of superimposing the control signal and the power source is adopted, the superposition can be realized by a component having an adding circuit such as a comparator, or a power converter can also be used for signal superposition, and the control signal can be input to the power converter. Adjust the corresponding port.

Matched with the output control circuit 30, an input control circuit is also provided at one end of the tuning circuit 20 to separate the mixed RF signal, power supply and control signals, and to transmit the separated power and control signals to Tuning circuit 20 provides operational power and control signals to tuning circuit 20.

Alternatively, the control signal may be a low frequency digital signal such that the frequency of the RF signal is several orders of magnitude different due to its low frequency, and the effect on the RF signal is negligible. And the control signal is configured based on a serial communication protocol, and includes control command information and address information of the tuning device in the tuning circuit 20, so that it can transmit both the control command information and the address information of the tuning device, in the tuning circuit 20. When multiple tuning devices are provided, several pieces of address information and control information corresponding to the address information can be simultaneously transmitted, so that control of multiple tuning devices can be realized, and the antenna system can work more efficiently. At the same time, because the bandwidth requirement of the tuning device for controlling the antenna is very low, the excess bandwidth can be reused for other device communication, such as for audio communication, transmission of audio data, etc., and finally one RF cable transmits both RF signals and power. And the effect of the control signal reduces the number of signal lines and reduces the complexity of tuning the antenna assembly.

When used for communication with other devices, optionally, the signal transmission circuit may further include an other control circuit such as an audio transmission control circuit, which is connected to the output of the input control circuit, and can transmit the control signal to the tuning circuit. Each tuning device.

The following is a description in conjunction with a detailed circuit diagram.

Please refer to FIG. 2 , which is a circuit diagram of a signal transmission circuit according to an embodiment of the present invention. In the embodiment of the present invention, the method includes:

a tuning circuit 20 connected to the second end of the radio frequency cable for receiving the control signal No. Control tuning device for tuning;

Specifically, the output control circuit 30 includes a comparator Q, a first resistor R1, a second resistor R2, a third resistor R3, and an adjustable resistor Rf. The inverting input terminal of the comparator Q passes through the first resistor. R1 is connected to the radio frequency transceiver circuit 20, and is specifically connected to the radio frequency switch S in the radio frequency transceiver circuit. The power source V0 is connected to the non-inverting input end of the comparator through the second resistor, and the control signal S0 is connected to the non-inverting input end of the comparator Q through the third resistor R3, the adjustable resistor Rf is connected between the output of the comparator Q and the inverting input of the comparator Q, and the output of the comparator Q is connected to the first end of the radio frequency cable via a first inductor L1.

The input control circuit 40 includes a power converter Z, a capacitor C and a flip-flop RS, and an input end of the power converter RS is connected to a second end of the radio frequency cable via a second inductor L2, the power converter An output end of the Z is connected to the tuning circuit 20. One end of the capacitor C is connected to the input end of the power converter Z, and the other end is connected to the first input end of the flip-flop RS. The output terminal of the power converter Z is connected to the output terminal of the power converter Z, and the output of the flip-flop RS is connected to the tuning circuit 20.

The radio frequency transceiver circuit 10 includes a radio frequency switch S and at least two frequency band transceiver channels, and the at least two frequency band transceiver channels are respectively connected to the radio frequency switch S, and the radio frequency switch S is connected by the first resistor R1. The inverting input of comparator Q.

The tuning circuit 20 includes at least two tuning devices having the same number of transmission and reception channels as the frequency band, and the at least two tuning devices are connected in series, one end is connected to the second end of the RF cable, and the other end is connected to the antenna radiating unit. The at least two tuning devices are respectively connected to the output end of the flip-flop RS and The output of the power converter Z is described.

A single tuning device can be composed of a superheterodyne vector antenna tuner and its peripheral circuits, which can perform low-power fast impedance matching, and the antenna impedance amplitude can be adjusted by the Trace Impedance Measuring System (TIMS). The phase is precisely adjusted to resonate with the received signal; or a single tuning device can be composed of an electronic tuner and its peripheral circuits, the signal input receiving signals from different frequency bands, and the control input adjusting itself according to the control signal The local oscillator signal is then mixed to filter out the signal of a certain frequency band received by the receiving end.

Optionally, the signal transmission circuit 100 further includes:

An audio transmission control circuit 50, a first output end of the audio transmission control circuit 50 is connected to an output end of the flip-flop RS, and a second output end of the audio transmission control circuit 50 and an output of the power converter Z End connection.

Optionally, the control signal is a low frequency digital signal. Its frequency is very low, and it is several orders of magnitude different from the level of the RF signal GHz, and the impact on the RF signal is negligible.

After the power supply V0 and the control signal S0 are superimposed into the signal S1 by the comparator Q, the first inductor L1 is superimposed on the radio frequency signal RF0, and the first inductor functions to isolate the high frequency signal and the low frequency signal, thereby ensuring that the high frequency radio frequency signal is not Will be transmitted to the output control circuit. After that, through the second inductor L2, the radio frequency signal is still transmitted on the radio frequency cable, and the signal S1 is separated by the input control circuit, and the output of the power converter Z is matched by the cooperation of the capacitor C, the power converter Z and the flip-flop RS. The working power supply V1 of the tuned circuit is supplied to the tuning circuit, V1 will be smaller than V0, and the control signal S2 is obtained at the output of the flip-flop RS, and S2 is based on S0, which contains the control command information and the address information of the tuning device, and then according to the address. The information is addressed and the control command information is transmitted to the corresponding tuning device such that the corresponding tuning device is tuned according to the tuning parameters contained in the control command information. At the same time, since the transmission of control information has low bandwidth requirements, the excess bandwidth can be reused for other devices for communication such as audio communication. Therefore, the audio transmission control circuit and the output of the power converter Z and the flip-flop RS can also be introduced. The end connection, that is, the connection with each tuning device in the tuning circuit, enables multiplexing of audio communication.

Please refer to FIG. 3 , which is a schematic diagram of the composition of a tuned antenna 300 according to an embodiment of the present invention. In this embodiment, the tuned antenna 300 includes:

An antenna radiating unit 200 for receiving and transmitting signals;

The signal transmission circuit 100 as described in any of the above embodiments of the signal transmission circuit. I will not repeat them here.

When the radio frequency transceiver circuit in the signal transmission circuit 100 needs to transmit a signal, the output control circuit in the signal transmission circuit 100 superimposes the control signal and the power source on the radio frequency signal, and then is separated by the input control circuit and outputted to the signal transmission circuit 100. In the tuning circuit, the tuning circuit is tuned according to the control signal, so that the transmitter of the RF transceiver circuit matches the impedance of the antenna radiating unit, so that the antenna radiating unit 200 has the largest radiated power at any frequency to transmit the signal; When the radiation unit 200 receives the signal, the output control circuit can also superimpose the control signal and the power source onto the radio frequency signal, and then separated by the input control circuit and supplied to the tuning circuit. After the tuning circuit is tuned according to the control signal, the antenna radiating unit 200 can receive the signal. The signal is filtered and the filtered signal is transmitted to the RF transceiver circuit. Thereby, the transmitting and receiving of the signal by the tuned antenna is realized.

It should be noted that the various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments are mutually referred to. can. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

Through the description of the above embodiments, the present invention has the following advantages:

The RF signal transmits both RF signals and power and control signals, which reduces the number of signal lines and reduces the complexity and cost of tuning antenna assembly. The control signals are based on serial communication protocol configuration, including control command information and tuning circuits. The address information of the device is tuned so that it can transmit both the control command information and the address information of the tuning device. When the tuning circuit has multiple tuning devices, it can simultaneously transmit several pieces of address information and corresponding to the address information. Control information so that control of multiple tuning devices can be achieved, enabling the antenna system to operate more efficiently; and because the bandwidth requirements of the tuning device controlling the antenna are low, the excess bandwidth can be reused for other device communication. Such as for audio communication, transmission of audio data, and the like.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to the program instructions. The foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

The signal transmission circuit and the tuned antenna provided by the embodiments of the present invention are described in detail. The principles and implementations of the present invention are described in the following. The description of the above embodiments is only used to help understand the present invention. The method of the invention and its core idea; at the same time, for the person of ordinary skill in the art, according to the idea of the present invention, there are some changes in the specific embodiment and the scope of application. In summary, the content of the specification should not be understood. To limit the invention.

Claims

A signal transmission circuit, comprising:

The radio frequency transceiver circuit is connected to the first end of the radio frequency cable for transmitting and receiving radio frequency signals;

a tuning circuit connected to the second end of the RF cable for controlling the tuning device to perform tuning according to the received control signal;

An output control circuit is connected to the first end of the radio frequency cable, and is configured to superimpose a control signal and a power source on the radio frequency signal sent by the radio frequency transceiver circuit, where the control signal is configured according to a serial communication protocol, and includes a control command. Information and address information of the tuning device in the tuning circuit;

An input control circuit having an input end connected to the second end of the radio frequency cable, and an output end connected to the tuning circuit for separating the mixed control signal, the power supply and the radio frequency signal, and separating the separated power supply and A control signal is transmitted to the tuning circuit.
The signal transmission circuit according to claim 1, wherein the output control circuit comprises a comparator, a first resistor, a second resistor, a third resistor and an adjustable resistor, and the opposite input end of the comparator passes The first resistor is connected to the radio frequency transceiver circuit, the power source is connected to the same input end of the comparator through the second resistor, and the control signal is connected to the comparator in the same direction through the third resistor An input end, the adjustable resistor is coupled between an output of the comparator and an inverting input of the comparator, and an output of the comparator passes through a first inductor and a first of the RF cable End connection.
The signal transmission circuit according to claim 1 or 2, wherein the input control circuit comprises a power converter, a capacitor and a flip-flop, and an input end of the power converter passes through the second inductor and the RF cable The second end is connected, the output end of the power converter is connected to the tuning circuit, one end of the capacitor is connected to the input end of the power converter, and the other end is connected to the first input end of the trigger. A second output of the flip-flop is coupled to an output of the power converter, and an output of the flip-flop is coupled to the tuning circuit.
The signal transmission circuit according to claim 3, wherein the radio frequency transceiver circuit comprises a radio frequency switch and at least two frequency band transceiver channels, and the at least two frequency band transceiver channels are respectively connected to the radio frequency switch, the radio frequency A switch is coupled to the inverting input of the comparator through the first resistor.
The signal transmission circuit according to claim 4, wherein said tuning circuit comprises at least two tuning devices having the same number of said frequency band transceiving channels, said at least two tuning devices being connected in series, one end being connected to said radio frequency The second end of the cable is connected to the antenna radiating unit, and the at least two tuning devices are respectively connected to the output end of the flip-flop and the output end of the power converter.
The signal transmission circuit according to claim 5, wherein the signal transmission circuit further comprises:

And an audio transmission control circuit, wherein a first output end of the audio transmission control circuit is connected to an output end of the flip-flop, and a second output end of the audio transmission control circuit is connected to an output end of the power converter.
A signal transmission circuit according to any one of claims 1 to 6, wherein the control signal is a low frequency digital signal.
A tuned antenna, comprising:

An antenna radiating element for receiving and transmitting signals;

A signal transmission circuit according to any one of claims 1-7.