WO2021169596A1

WO2021169596A1 - Radio frequency link working state measurement method, related measurement apparatus, and system

Info

Publication number: WO2021169596A1
Application number: PCT/CN2020/142122
Authority: WO
Inventors: 叶鹭欣
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2020-02-27
Filing date: 2020-12-31
Publication date: 2021-09-02
Also published as: CN113315587A

Abstract

The present invention provides a radio frequency link working state measurement method, comprising the following steps: step S1, using a first port of a directional coupler to receive a radio frequency signal, outputting and sending the radio frequency signal to a radio frequency antenna by means of a second port of the directional coupler, using the radio frequency signal and outputting a first reflected wave signal by means of a third port of the directional coupler, and using the first reflected wave signal and outputting a second reflected wave signal by means of a fourth port of the directional coupler; a measurement circuit receives the first reflected wave signal and measures the power of an incident wave from the first port by means of the first reflected wave signal, and a working state of a radio frequency front end circuit is determined according to the power of the incident wave from the first port; wherein, the radio frequency front end circuit comprises a radio frequency front end chip and a front end matching circuit. The present invention further provides a radio frequency link measurement apparatus and a radio frequency link system. Compared to related technology, a technical solution utilizing the present invention monitors the working state of a radio frequency link in real time and has high product reliability.

Description

Radio frequency link working state detection method, related detection device and system

【Technical Field】

The invention relates to the technical field of radio frequency detection, in particular to a radio frequency link working state detection method, a radio frequency link detection device and a radio frequency link system.

【Background technique】

As wireless technology is more and more widely used, there are more and more wireless products with radio frequency modules.

The radio frequency link in the radio frequency module of the related art generally includes a radio frequency chip and a radio frequency antenna.

However, the current radio frequency link generally does not monitor the radio frequency circuit, but if the radio frequency link works abnormally, on the one hand, the wireless signal will not be transmitted, resulting in malfunction; on the other hand, the radio frequency link is abnormal, which may cause abnormalities. There is total power reflection. When the reflected signal and the transmitted signal are superimposed at the port of the radio frequency chip, there is a greater risk of burning the chip and circuit, resulting in damage to the machine.

Therefore, it is necessary to provide a new method, detection device and radio frequency system to solve the above technical problems.

[Summary of the invention]

The purpose of the present invention is to overcome the above technical problems and provide a method for detecting the working state of the radio frequency link that can place the directional coupler at any position of the radio frequency link, monitor the working state of the radio frequency link in real time, and have high product reliability. Radio frequency link detection device and radio frequency link system.

In order to achieve the above objective, the present invention provides a method for detecting the working status of a radio frequency link, which includes the following steps:

Step S1: Use the first port of the directional coupler to receive the radio frequency signal of the incident wave sent by the radio frequency front-end chip, output the radio frequency signal through the second port of the directional coupler and send it to the radio frequency antenna, and send the radio frequency signal Output the first reflected wave signal through the third port of the directional coupler, and output the second reflected wave signal through the fourth port of the directional coupler;

Step S2. The detection circuit receives the first reflected wave signal, detects the power of the incident wave at the first port through the first reflected wave signal, and judges the radio frequency front end according to the power of the incident wave at the first port The working state of the circuit; wherein, the radio frequency front-end circuit includes the radio frequency front-end chip and a front-end matching circuit connected to the radio frequency front-end chip.

More preferably, after the step S1, the method for detecting the working state of the radio frequency link further includes the following steps:

Step S3: The detection circuit receives the second reflected wave signal, and detects the power of the reflected wave at the third port through the second reflected wave signal, according to the power of the reflected wave at the third port and The ratio of the power of the incident wave at the first port determines the working state of the subsequent radio frequency circuit.

More preferably, judging the working state of the radio frequency front-end circuit according to the power of the incident wave at the first port specifically includes: when the power of the incident wave at the first port is within a preset range, the radio frequency front-end circuit The operation is normal. When the power of the incident wave at the first port exceeds a preset range, the radio frequency front-end circuit works abnormally.

More preferably, when the radio frequency front-end circuit works abnormally, the radio frequency link working state detection method further includes the following steps:

Step S4: The detection circuit sends a front-end circuit alarm signal.

More preferably, judging the working state of the subsequent radio frequency circuit according to the ratio of the power of the reflected wave of the third port to the power of the incident wave of the first port specifically includes:

When the ratio of the power of the reflected wave at the third port to the power of the incident wave at the first port is within a preset range, the subsequent radio frequency circuit works normally, and when the reflected wave at the third port is When the ratio of the power of the first port to the power of the incident wave at the first port is outside the preset range, the downstream radio frequency circuit works abnormally.

More preferably, when the downstream radio frequency circuit works abnormally, the radio frequency link working state detection method further includes the following steps:

Step S5: The detection circuit sends an alarm signal for the subsequent circuit.

The present invention also provides a radio frequency link detection device, which includes:

A directional coupler. The first port of the directional coupler is used to receive the radio frequency signal of the incident wave sent by the radio frequency front-end chip, and the radio frequency signal is output through the second port of the directional coupler and sent to the radio frequency antenna. The radio frequency signal outputs a first reflected wave signal through the third port of the directional coupler, and the first reflected wave signal outputs a second reflected wave signal through the fourth port of the directional coupler;

A detection circuit for receiving the first reflected wave signal, detecting the power of the incident wave at the first port through the first reflected wave signal, and judging the radio frequency front end according to the power of the incident wave at the first port The working state of the circuit, wherein the radio frequency front-end circuit includes the radio frequency front-end chip and a front-end matching circuit connected to the radio frequency front-end chip; receiving the second reflected wave signal, and detecting the second reflected wave signal The power of the reflected wave at the third port is output, and the working state of the subsequent radio frequency circuit is determined according to the ratio of the power of the reflected wave at the third port to the power of the incident wave at the first port.

More preferably, the detection circuit includes:

A first detection circuit, configured to receive the first reflected wave signal and convert the first reflected wave signal to a first level;

A second detection circuit for receiving the second reflected wave signal and converting the second reflected wave signal to a second level;

The main control module is used for receiving the first level and judging the working state of the radio frequency front-end circuit according to the level, receiving the second level and according to the ratio of the second level to the first level Determine the working status of the subsequent RF circuit.

More preferably, the main control module includes: an analog-to-digital converter for converting the first level and the second level into digital signals, respectively, the analog-to-digital converter and the first detector respectively The circuit is connected to the second detection circuit.

The present invention also provides a radio frequency link system, which includes a radio frequency front-end chip, a radio frequency antenna, and the radio frequency link detection device described in any one of the above.

Compared with the prior art, the method for detecting the working status of a radio frequency link of the present invention adopts the following steps: Step S1: Use the first port of the directional coupler to receive the radio frequency signal of the incident wave sent by the radio frequency front-end chip, and The radio frequency signal is output through the second port of the directional coupler and sent to the radio frequency antenna, the radio frequency signal is outputted through the third port of the first reflected wave signal, and the first reflected wave signal is transmitted through the directional coupling The fourth port of the device outputs the second reflected wave signal; step S2, the detection circuit receives the first reflected wave signal, and detects the power of the incident wave at the first port based on the first reflected wave signal. The power of the incident wave at the first port determines the working state of the radio frequency front-end circuit. More preferably, the radio frequency link working state detection method of the present invention further includes step S3. The detection circuit receives the second reflected wave signal, and detects the reflection of the third port through the second reflected wave signal. The power of the wave determines the working state of the subsequent radio frequency circuit according to the ratio of the power of the reflected wave of the third port to the power of the incident wave of the first port. Using the radio frequency link working state detection method to monitor the working state of the radio frequency link in real time, not only the working state of the radio frequency front-end circuit can be detected, but also the working state of the subsequent radio frequency circuit can be detected, thereby making the product highly reliable. The radio frequency link detection device and the radio frequency link system of the present invention can place the directional coupler at any position of the radio frequency link, thereby realizing real-time monitoring of the working status of the radio frequency link, and making the product highly reliable.

【Explanation of the drawings】

In order to explain the technical solutions in the embodiments of the present invention more clearly, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings, among which:

FIG. 1 is a flowchart of Embodiment 1 of a method for detecting a working state of a radio frequency link according to the present invention;

2 is a flowchart of Embodiment 2 of a method for detecting a working state of a radio frequency link according to the present invention;

3 is a flowchart of Embodiment 3 of a method for detecting a working state of a radio frequency link according to the present invention;

4 is a structural block diagram of the radio frequency link detection device of the present invention;

Fig. 5 is a structural block diagram of the radio frequency link system of the present invention.

【Detailed ways】

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Example one

Please refer to FIG. 1, the present invention provides a method for detecting the working status of a radio frequency link. The method for detecting the working state of a radio frequency link in the first embodiment of the present invention includes the following steps:

Step S1: Use the first port of the directional coupler to receive the radio frequency signal of the incident wave sent by the radio frequency front-end chip, output the radio frequency signal through the second port of the directional coupler and send it to the radio frequency antenna, and send the radio frequency signal The first reflected wave signal is output through the third port of the directional coupler, and the second reflected wave signal is output through the fourth port of the directional coupler.

Specifically, the directional coupler is a four-port network, the first port is an input end, the second port is a through end, the third port is a coupling end, and the fourth port is an isolation end. In this embodiment, the input terminal transmits the radio frequency signal to the radio frequency antenna through the through terminal. The coupling end couples the forward power of the input end to sample a part of the power, and at the same time, the coupling end couples out the first reflected wave signal. The isolation end couples the reflected power from the through end to sample a part of the power, and at the same time, the isolation end outputs a second reflected wave signal.

Wherein, the coupling coefficient of the directional coupler is less than -10dB, and its isolation can be considered as an ideal state without power leakage. In this case, the coupling of the directional coupler into the original radio frequency circuit will not affect the original radio frequency circuit Normal working condition.

Step S2. The detection circuit receives the first reflected wave signal and detects the power of the incident wave at the first port through the first reflected wave signal, and judges the radio frequency front-end circuit according to the power of the incident wave at the first port Working status. Wherein, the radio frequency front-end circuit includes the radio frequency front-end chip and a front-end matching circuit connected to the radio frequency front-end chip.

The detection circuit in the step S2 realizes the detection of the working state of the radio frequency front-end circuit by detecting the input state of the first port. The step S2 realizes the detection of the working state of the radio frequency front-end circuit by real-time monitoring of the working state of the radio frequency link, so that the reliability of the product is high.

Specifically, judging the working state of the radio frequency front-end circuit according to the power of the incident wave at the first port specifically includes: when the power of the incident wave at the first port is within a preset range, the radio frequency front-end circuit operates Normally, when the power of the incident wave of the first port exceeds the preset range, such as the radio frequency front-end chip is abnormal or the front-end matching circuit is damaged, the input power of the first port will exceed the preset range. At this time, it can be determined that the RF front-end circuit is working abnormally. The radio frequency front-end circuit works abnormally, generally obviously abnormal. It can be determined that the RF front-end circuit is working abnormally at this time.

Example two

As shown in FIG. 2, the method for detecting the working status of a radio frequency link in the second embodiment of the present invention includes all the steps of the first implementation, and the following steps are added:

Specifically, after the step S1, the method for detecting the working state of the radio frequency link further includes the following steps:

The step S3 and the step S2 are parallel at the same time. That is to say, the detection circuit in the step S2 realizes the detection of the working state of the radio frequency front-end circuit by detecting the input state of the first port. At the same time, the detection circuit in the step S3 detects the working state of the subsequent radio frequency circuit by detecting the state of the reflected wave of the third port. Using the radio frequency link working state detection method to monitor the working state of the radio frequency link in real time, not only can detect the working state of the radio frequency front-end circuit, but also the working state of the downstream radio frequency circuit, so that The reliability of the product is high.

Specifically, judging the working state of the subsequent radio frequency circuit according to the ratio of the power of the reflected wave of the third port to the power of the incident wave of the first port includes: when the power of the reflected wave of the third port is When the ratio of the power of the incident wave at the first port to the power of the incident wave at the first port is within the preset range, the subsequent radio frequency circuit works normally, and when the power of the reflected wave at the third port is compared with the incident wave at the first port When the ratio of the power is outside the preset range, the downstream radio frequency circuit works abnormally.

Specifically, the detection of the reflected wave of the third port is the detection of the working state of the subsequent radio frequency circuit, which may include the detection of the working state of devices such as matching circuits, duplexers, antennas, etc.

Specifically, when the downstream radio frequency circuit works normally, according to the radio frequency circuit operating requirements, the reflected wave of the third port is higher than the incident wave of the first port, and the reflection coefficient is above -10dB. The power of the incident wave of the port can be obtained from the power range of the reflected wave of the third port. The reflected wave of the third port is coupled by the directional coupler and then output from the fourth port, and is detected by the detection circuit And judgment, the power of the reflected wave of the third port can be monitored.

Specifically, when an abnormality occurs in the downstream radio frequency circuit, such as component damage, an abnormal antenna connection, etc., the power of the reflected wave of the third port will increase. At this time, the power of the reflected wave of the third port is compared with the power of the reflected wave of the third port. According to the power ratio of the incident wave at the first port, it can be inferred that the circuit works abnormally.

Example three

As shown in FIG. 3, the radio frequency link working state detection method in the third embodiment of the present invention includes all the steps of the second embodiment, and the following steps are added:

In order to better improve product reliability, when the working state of the radio frequency link is abnormal, appropriate measures are taken in time, and an alarm signal needs to be issued by the detection circuit. In this embodiment, the method for detecting the working state of the radio frequency link further includes the following two steps:

Specifically, when the radio frequency front-end circuit works abnormally, the radio frequency link working state detection method further includes the following steps:

Step S4: The detection circuit sends a front-end circuit alarm signal.

Wherein, the step S4 is entered from the step S2.

When the downstream radio frequency circuit works abnormally, the radio frequency link working state detection method further includes the following steps:

Wherein, the step S5 is entered from the step S3.

It should be pointed out that the directional coupler, the detection circuit, the radio frequency front-end circuit, and the downstream radio frequency circuit used in the radio frequency link working state detection method of the present invention are all commonly used devices in the field. Or circuit, the specific model needs to select the model with specific performance according to the actual design, and will not be described in detail here.

Please refer to FIGS. 4-5 at the same time. The present invention also provides a radio frequency link system 200 and a radio frequency link detection device 100. The radio frequency link system 200 includes a radio frequency front-end chip 20, a radio frequency antenna 30 and the radio frequency link detection device 100.

Specifically, the radio frequency link detection device 100 includes:

The directional coupler 1 is used to receive the radio frequency signal of the incident wave sent by the radio frequency front-end chip 20 at the first port IO1 of the directional coupler 1, and pass the radio frequency signal through the second port IO2 of the directional coupler 1 Output and send to the radio frequency antenna 30, the radio frequency signal is output through the third port IO3 of the directional coupler 1 to output the first reflected wave signal, and the first reflected wave signal is passed through the fourth port IO3 of the directional coupler 1. The port IO4 outputs the second reflected wave signal. Wherein, the directional coupler can be placed at any position of the radio frequency link, so as to realize real-time monitoring of the working status of the radio frequency link, so that the reliability of the product is high.

The detection circuit 2 is configured to receive the first reflected wave signal and detect the power of the incident wave at the first port IO1 through the first reflected wave signal, and determine according to the power of the incident wave at the first port IO1 The working state of the radio frequency front-end circuit receives the second reflected wave signal and detects the reflected wave power of the third port IO3 through the second reflected wave signal, according to the power of the reflected wave of the third port IO3 The ratio of the power of the incident wave to the first port IO1 determines the working state of the subsequent radio frequency circuit.

The detection circuit 2 includes:

The first detection circuit 21 is configured to receive the first reflected wave signal and convert the first reflected wave signal to a first level. The first level is used to calculate the power of the incident wave of the first port IO1.

The second detection circuit 22 is configured to receive the second reflected wave signal and convert the second reflected wave signal to a second level. The second level is used to calculate the power of the reflected wave of the third port IO3.

The main control module 23 is used for receiving the first level and judging the working state of the radio frequency front-end circuit according to the level, receiving the second level and determining the difference between the second level and the first level The ratio judges the working status of the subsequent radio frequency circuit. That is, the first level and the second level are used to calculate the ratio of the power of the reflected wave of the third port IO3 to the power of the incident wave of the first port IO1.

Wherein, the main control module 23 includes: an analog-to-digital converter 231 for converting the first level and the second level into digital signals, respectively, and the analog-to-digital converter 231 is connected to the first level and the second level respectively. The detection circuit 21 is connected to the second detection circuit 22.

When the RF front-end circuit works abnormally, for example, the RF front-end chip 20 works abnormally, or the front-end matching circuit is damaged, which will cause the input power of the first port IO1 to be obviously abnormal. At this time, when the input power of the first detection circuit 21 is abnormal, and the output of the first level is sampled by the analog-to-digital converter 231 of the main control module 23, it can be determined that the radio frequency front-end circuit works abnormally at this time.

When the downstream radio frequency circuit works normally, according to the radio frequency circuit working requirements, the reflected wave of the third port IO3 is higher than the incident wave of the first port IO1, and the reflection coefficient is above -10dB, so according to the first The power of the incident wave of the port IO1 can be obtained from the power range of the reflected wave of the third port IO3, and the reflected wave of the third port IO3 is coupled by the directional coupler and then output from the fourth port IO4, After the second detection circuit 22 detects and outputs the second level after being sampled by the analog-to-digital converter 231 of the main control module 23, the power of the reflected wave of the third port IO3 can be monitored. When there is an abnormality in the downstream radio frequency circuit, such as component damage, abnormal antenna connection, etc., which affects the operation of the radio frequency link, it will cause the power of the reflected wave of the third port IO3 to increase. At this time, by comparing the third port IO3 The ratio of the power of the reflected wave to the power of the incident wave of the first port IO1 can be inferred that the circuit works abnormally.

Through the radio frequency link system 200 and the radio frequency link detection device 100, real-time monitoring of the working state of the radio frequency link is realized, which can not only monitor the working state of the radio frequency front-end circuit, but also the working state of the subsequent radio frequency circuit. Carry out monitoring, so that the reliability of the product is high.

It should be pointed out that the radio frequency front-end chip 20, radio frequency antenna 30, the directional coupler 1, the first detection circuit 21, and the second detection circuit used in the radio frequency link system 200 and the radio frequency link detection device 100 of the present invention The detection circuit 22, the main control module 23, the analog-to-digital converter 231, the radio frequency front-end circuit, and the downstream radio frequency circuit are all commonly used devices or circuits in the field. The specific model needs to be selected according to the actual design. The performance model will not be described in detail here.

Compared with the prior art, the method for detecting the working status of a radio frequency link of the present invention adopts the following steps: Step S1: Use the first port of the directional coupler to receive the radio frequency signal of the incident wave sent by the radio frequency front-end chip, and The radio frequency signal is output through the second port of the directional coupler and sent to the radio frequency antenna, the radio frequency signal is output through the third port of the directional coupler to output a first reflected wave signal, and the first reflected wave signal is passed through The fourth port of the directional coupler outputs the second reflected wave signal; step S2, the detection circuit receives the first reflected wave signal, and detects the incident wave of the first port through the first reflected wave signal Power, judging the working state of the radio frequency front-end circuit according to the power of the incident wave at the first port. More preferably, the radio frequency link working state detection method of the present invention further includes step S3. The detection circuit receives the second reflected wave signal, and detects the reflection of the third port through the second reflected wave signal. The power of the wave determines the working state of the subsequent radio frequency circuit according to the ratio of the power of the reflected wave of the third port to the power of the incident wave of the first port. The radio frequency link working state detection method monitors the working state of the radio frequency link in real time. It not only detects the working state of the radio frequency front-end circuit, but also detects the working state of the subsequent radio frequency circuit, so that the reliability of the product is high. The radio frequency link detection device and the radio frequency link system of the present invention can place the directional coupler at any position of the radio frequency link, thereby realizing real-time monitoring of the working state of the radio frequency link, thereby making the product highly reliable.

The above are only the embodiments of the present invention. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these all belong to the present invention. The scope of protection.

Claims

A method for detecting the working status of a radio frequency link is characterized in that the method includes the following steps:

Step S1: Use the first port of the directional coupler to receive the radio frequency signal of the incident wave sent by the radio frequency front-end chip, output the radio frequency signal through the second port of the directional coupler and send it to the radio frequency antenna, and send the radio frequency signal Output the first reflected wave signal through the third port of the directional coupler, and output the second reflected wave signal through the fourth port of the directional coupler;

Step S2. The detection circuit receives the first reflected wave signal, detects the power of the incident wave at the first port through the first reflected wave signal, and judges the radio frequency front end according to the power of the incident wave at the first port The working state of the circuit; wherein, the radio frequency front-end circuit includes the radio frequency front-end chip and a front-end matching circuit connected to the radio frequency front-end chip.
The method for detecting the working state of a radio frequency link according to claim 1, characterized in that, after the step S1, the method for detecting the working state of a radio frequency link further comprises the following steps:

Step S3: The detection circuit receives the second reflected wave signal, and detects the power of the reflected wave at the third port through the second reflected wave signal, according to the power of the reflected wave at the third port and The ratio of the power of the incident wave at the first port determines the working state of the subsequent radio frequency circuit.
The method for detecting the working state of a radio frequency link according to claim 1, wherein judging the working state of the radio frequency front-end circuit according to the power of the incident wave at the first port specifically comprises:

When the power of the incident wave at the first port is within the preset range, the radio frequency front-end circuit works normally, and when the power of the incident wave at the first port is outside the preset range, the radio frequency front end The circuit works abnormally.
The radio frequency link working state detection method according to claim 3, wherein when the radio frequency front-end circuit works abnormally, the radio frequency link working state detection method further comprises the following steps:

Step S4: The detection circuit sends a front-end circuit alarm signal.
The method for detecting the working status of a radio frequency link according to claim 2, wherein the operation of the subsequent radio frequency circuit is determined according to the ratio of the power of the reflected wave of the third port to the power of the incident wave of the first port Status, including:

When the ratio of the power of the reflected wave at the third port to the power of the incident wave at the first port is within a preset range, the subsequent radio frequency circuit works normally, and when the reflected wave at the third port is When the ratio of the power of the first port to the power of the incident wave at the first port is outside the preset range, the downstream radio frequency circuit works abnormally.
The method for detecting the working state of a radio frequency link according to claim 5, wherein when the downstream radio frequency circuit works abnormally, the method for detecting the working state of the radio frequency link further comprises the following steps:

Step S5: The detection circuit sends an alarm signal for the subsequent circuit.
A radio frequency link detection device, characterized in that the device includes:

A directional coupler. The first port of the directional coupler is used to receive the radio frequency signal of the incident wave sent by the radio frequency front-end chip, and the radio frequency signal is output through the second port of the directional coupler and sent to the radio frequency antenna. The radio frequency signal outputs a first reflected wave signal through the third port of the directional coupler, and the first reflected wave signal outputs a second reflected wave signal through the fourth port of the directional coupler;

A detection circuit for receiving the first reflected wave signal, detecting the power of the incident wave at the first port through the first reflected wave signal, and judging the radio frequency front end according to the power of the incident wave at the first port The working state of the circuit, wherein the radio frequency front-end circuit includes the radio frequency front-end chip and a front-end matching circuit connected to the radio frequency front-end chip; receiving the second reflected wave signal, and detecting the second reflected wave signal The power of the reflected wave at the third port is output, and the working state of the subsequent radio frequency circuit is determined according to the ratio of the power of the reflected wave at the third port to the power of the incident wave at the first port.
The radio frequency link detection device according to claim 7, wherein the detection circuit comprises:

A first detection circuit, configured to receive the first reflected wave signal and convert the first reflected wave signal to a first level;

A second detection circuit for receiving the second reflected wave signal and converting the second reflected wave signal to a second level;

The main control module is used for receiving the first level and judging the working state of the radio frequency front-end circuit according to the level, receiving the second level and according to the ratio of the second level to the first level Determine the working status of the subsequent RF circuit.
The radio frequency link detection device according to claim 8, wherein the main control module comprises: an analog-to-digital converter for converting the first level and the second level into digital signals, respectively, The analog-to-digital converter is respectively connected to the first detection circuit and the second detection circuit.
A radio frequency link system, comprising a radio frequency front-end chip and a radio frequency antenna, wherein the radio frequency link system further comprises the radio frequency link detection device according to any one of claims 7-9.