CN207730838U - A kind of automatic antenna detection circuit based on ultrahigh frequency radio frequency identification (RFID) reader - Google Patents
A kind of automatic antenna detection circuit based on ultrahigh frequency radio frequency identification (RFID) reader Download PDFInfo
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- CN207730838U CN207730838U CN201721582656.4U CN201721582656U CN207730838U CN 207730838 U CN207730838 U CN 207730838U CN 201721582656 U CN201721582656 U CN 201721582656U CN 207730838 U CN207730838 U CN 207730838U
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Abstract
The automatic antenna detection circuit based on ultrahigh frequency radio frequency identification (RFID) reader that the utility model discloses a kind of, by the power for detecting the coupled end of antenna direction coupler, judge currently to whether there is strong reflection, antenna output is automatically closed in abnormal cases, power amplifier and receiving terminal is avoided to be damaged by strong reflectance signal, the service life for extending ultrahigh frequency radio frequency identification (RFID) reader brings higher economic benefit for user.
Description
Technical field
The utility model belongs to electronic information communication technical field, and in particular to a kind of based on ultrahigh frequency radio frequency identification (RFID) reader
Automatic antenna detection circuit.
Background technology
Radio frequency identification (RFID) technology is a kind of emerging automatic identification technology, and non-connect is carried out using wireless radio frequency mode
Bidirectional data communication is touched to can be used to track and manage almost all of physics to achieve the purpose that target identification and exchange data
Object has widely in industrial automation, business automation, communications and transportation control management, the anti-fake and various fields such as military
Application prospect.According to the difference of working frequency range, RFID system can be divided into low frequency (135kHz or less), high frequency (13.56MHz),
Several classes such as hyperfrequency (860 ~ 960MHz), microwave (2.4GHz or more).Current most of RFID systems are low frequency and radio frequency system.
With the proposition of the concepts such as industry 4.0, made in China 2025, the intelligence and automation of production increasingly obtain people
Concern, and one of the technical foundation for realizing above-mentioned target is technology of Internet of things.Under this overall background, it is contemplated that superelevation
Frequently the RFID system of (UHF) frequency range has many advantages, such as that operating distance is remote, communication speed is fast, at low cost, size is small, is more suitable for future
Logistics, the application in supply chain field, also provide possibility for realization " Internet of Things ", and developing into for ultrahigh frequency RFID system is current
The emphasis of RFID system development.
Since ultrahigh frequency radio frequency identification (RFID) reader is to be operated in radio frequency band, the strong reflection of antenna end can cause power amplifier and receiving terminal
Saturation and device damage, especially because strong reflection caused by the reasons such as circuit damage, the not connected, antenna failure of antenna is very
It may make the damage of receiving terminal and amplifier.
In order to promote the reliability of reader, a kind of automatic antenna detection circuit based on ultrahigh frequency radio frequency identification (RFID) reader is designed
The reliability of reader is improved, reader is made automatically to be closed in reasons such as circuit damage, the not connected, antenna failures of antenna
Antenna output is closed, power amplifier and receiving terminal is avoided to be damaged by strong reflectance signal.
Utility model content
To solve the above-mentioned problems, the automatic antenna detection based on ultrahigh frequency radio frequency identification (RFID) reader that the utility model proposes a kind of
Circuit, which is characterized in that the automatic antenna detection circuit includes power collection module U1, power judgment module U2A, with reference to electricity
Source module U4 and radio frequency control module U3, power collection module U1 and reference power source module U4 respectively with power comparison module U2A
It is connected, power comparison module U2A is connected with radio frequency control module U3；
Power collection module U1 is used for acquiring the power of the coupled end of antenna direction coupler；
Reference power source module U4 is used for providing 3V reference voltages；
Whether power judgment module U2A is used for judging the power level of power collection module U1 outputs in threshold value；
Radio frequency control module U3 is used for according to control Automatic shutting-down of signal antenna output.
Further, select MAX4003 as the power collection module U1.
Further, select power reference chip REF1930 as the reference power source module U4.
Further, select MAX491 as the power comparison module U2A.
Further, automatic antenna detection circuit further includes precision resistance, and the precision resistance is made by way of partial pressure
The threshold value of the power comparison module U2A is met the requirements.
Further, select ADRF5130 as the radio frequency control module U3.
Description of the drawings
Fig. 1 is the circuit diagram of the utility model specific embodiment.
Specific implementation mode
For a clearer understanding of the technical features, objectives and effects of the utility model, existing control description of the drawings
Specific embodiment of the present utility model.
Automatic antenna detection circuit based on ultrahigh frequency radio frequency identification (RFID) reader includes power collection module U1, power judgment module
U2A, reference power source module U4 and radio frequency control module U3.
Power collection module U1 is connected with power comparison module U2A respectively with reference power source module U4, and power compares mould
Block U2A is connected with radio frequency control module U3.
Power collection module U1 is used for acquiring the power of the coupled end of antenna direction coupler.Antenna direction coupler passes through
Certain coupling mechanism carries out power distribution, the output of coupled end according to a certain percentage by the microwave signal that antenna is collected is acquired
It is capable of the size of reflected microwave signal power.In view of MAX4003 is designed to detect the power level of RF power amplifiers
Low cost, low-power consumption logafier, can be used for a variety of wireless applications, including cellular handset PA controls, wireless terminal device
In TSSI and other equipment in transmission power measurement etc., be capable of providing broader measurement range and higher precision, select
Use MAX4003 as power collection module U1.
Reference power source module U4 uses power reference chip REF1930, for providing 3V reference voltages.
Power judgment module U2A is used to judge the power level of power collection module U1 outputs whether in reasonable threshold value,
Whether the power by comparing the current microwave signal of determination is normal.Select MAX491 as power comparison module U2A.
Accurately judge operation to realize, needs the threshold value of reasonable set MAX491.In the present solution, using such as lower section
The reasonable threshold value size of method：
1）Power-sensing circuit is built, circuit includes MAX4003 and oscillograph, and MAX4003 is used for acquiring antenna direction coupling
The power of the coupled end of clutch, oscillograph are used for detecting the power level of MAX4003 outputs；
2）The rationally estimated various situations for being likely to occur strong reflection, such as circuit damage, antenna are not connected with, antenna failure
Deng in estimated a variety of power level sizes for detecting MAX4003 outputs respectively, record is in the database；
3）The actual application environment of current ultrahigh frequency radio frequency identification (RFID) reader by inquiry, analysis extract typical case scene,
Such as warehouse, express delivery sorting etc., according to feature different under each application scenarios, the data that Binding experiment obtains obtain each
Different threshold value under application environment；
4）The concrete application scene of factual survey client is divided into some specific typical case and answers according to investigation result
With scene, suitable threshold value is selected.
In order to keep the threshold value of comparator accurate, reliable reference power source is provided using power reference chip REF1930, simultaneously
Make comparator in desired threshold value threshold range by precision resistance partial pressure.
Radio frequency control module U3 is used to, according to control Automatic shutting-down of signal antenna output, avoid power amplifier and receiving terminal by strong anti-
Penetrate signal corruption.In view of ADRF5130 is a high power, reflective single-pole double throw (SPDT) transwitch, using no pin,
Surface mount packages are very suitable for high power and cellular infrastructure application, become the ideal replacement device switched based on pin diodes
Part selects ADRF5130 as radio frequency control module U3.
The course of work of antenna detection circuit is：
The power of the coupled end of power collection module U1 acquisition antenna direction couplers, power collection module U1 will be acquired
The power level transmission arrived gives power judgment module U2A, and when power level is higher than the threshold value of power judgment module U2A, output is high
Level gives radio frequency control module U3, radio frequency control module U3 to be switched to another way from antenna output end, the signal for making power amplifier export
Ground directly is switched to by 50 Ohmic resistances from power amplifier output end, receiving terminal does not have strong reflection, avoids the damage of receiving circuit.
Antenna detection circuit disclosed in this programme is judged current by the power of the coupled end of detection antenna direction coupler
With the presence or absence of strong reflection, antenna output is automatically closed in abnormal cases, power amplifier and receiving terminal is avoided to be damaged by strong reflectance signal,
The service life for extending ultrahigh frequency radio frequency identification (RFID) reader brings higher economic benefit for user.
One of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in computer read/write memory medium
In, the program is when being executed, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, ROM, RAM etc..
Above disclosures are merely preferred embodiments of the utility model, with this utility model cannot be limited certainly
Interest field, therefore equivalent variations made according to the claim of the utility model still fall within the scope of the utility model.
Claims (6)
1. a kind of automatic antenna detection circuit based on ultrahigh frequency radio frequency identification (RFID) reader, which is characterized in that the automatic antenna detection
Circuit includes that power collection module U1, power judgment module U2A, reference power source module U4 and radio frequency control module U3, power are adopted
Collection module U1 is connected with power comparison module U2A respectively with reference power source module U4, power comparison module U2A and radio frequency control
Module U3 is connected；
Power collection module U1 is used for acquiring the power of the coupled end of antenna direction coupler；
Reference power source module U4 is used for providing 3V reference voltages；
Whether power judgment module U2A is used for judging the power level of power collection module U1 outputs in threshold value；
Radio frequency control module U3 is used for according to control Automatic shutting-down of signal antenna output.
2. automatic antenna detection circuit according to claim 1, which is characterized in that select MAX4003 as the power
Acquisition module U1.
3. automatic antenna detection circuit according to claim 1, which is characterized in that select power reference chip REF1930
As the reference power source module U4.
4. automatic antenna detection circuit according to claim 1, which is characterized in that select MAX491 as the power ratio
Compared with module U2A.
5. automatic antenna detection circuit according to claim 4, which is characterized in that automatic antenna detection circuit further includes essence
Cipher telegram hinders, and the precision resistance meets the requirements the threshold value of the power comparison module U2A by way of partial pressure.
6. automatic antenna detection circuit according to claim 1, which is characterized in that select ADRF5130 as the radio frequency
Control module U3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721582656.4U CN207730838U (en) | 2017-11-23 | 2017-11-23 | A kind of automatic antenna detection circuit based on ultrahigh frequency radio frequency identification (RFID) reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721582656.4U CN207730838U (en) | 2017-11-23 | 2017-11-23 | A kind of automatic antenna detection circuit based on ultrahigh frequency radio frequency identification (RFID) reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207730838U true CN207730838U (en) | 2018-08-14 |
Family
ID=63087898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721582656.4U Expired - Fee Related CN207730838U (en) | 2017-11-23 | 2017-11-23 | A kind of automatic antenna detection circuit based on ultrahigh frequency radio frequency identification (RFID) reader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207730838U (en) |
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2017
- 2017-11-23 CN CN201721582656.4U patent/CN207730838U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180814 Termination date: 20211123 |
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| CF01 | Termination of patent right due to non-payment of annual fee |