CN103267911B - The non-contact testing system and method for RFID label antenna - Google Patents
The non-contact testing system and method for RFID label antenna Download PDFInfo
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Abstract
The invention discloses a kind of system and method to RFID label antenna non-contact testing, the non-contact testing system of RFID label antenna comprises display unit, data processing and control module, unit is sent out/received to radiofrequency signal, feed mechanism unit and test antenna unit, data processing and control module send driver element with display unit, radiofrequency signal respectively, feed mechanism unit is connected, and test antenna unit is sent out/received unit and is connected with radiofrequency signal.Adopt non-contact testing, do not need binding chip just can test, decrease the loss of chip; Reduce the working strength of reviewer; False retrieval, loss are low; Can realize Aulomatizeted Detect, detection efficiency is high; The indirect inspection to electrical property can be realized.The requirement that the present invention easily realizes automatic test and greatly reduces mechanical mechanism, is very applicable to large batch of production testing.
Description
Technical field
The present invention relates to the field tests technical field of REID, particularly a kind of system and method that RFID label antenna is tested.
Background technology
RFID full name is radio-frequency (RF) identification (Radio Frequency Identification), is a kind of non-contact automatic identification technology utilizing radio-frequency technique to realize.RFID label has that volume is little, read or write speed is fast, various shapes, long service life, reusable, memory capacity large, can penetrate the features such as non-conductive material, multi-targets recognition and moving target identification can be realized in conjunction with RFID read write line, the tracking of article in global range and sharing of information can also be realized further by the combination with Internet technology.RFID technology is applied to the industries such as logistics, manufacture, public information service, significantly can improve management and operational paradigm, reduce costs.
RFID technology has become the focus in IT field at present, and numerous mechanism and enterprise are all wideling popularize this technology.Along with the develop rapidly of RFID technology, the manufacturer of Related product increases gradually, and the kind of RFID label has also risen to hundreds of, and is constantly releasing new product.In order to select the product that can meet user's demand in various RFID label, carry out special test with regard to needing to the performance index of RFID product, namely the consistance of RFID label antenna is one of important performance indexes of RFID label tag product.RFID label antenna consistance refers to that for a electronic tag, due to the electromagnetic properties differ between the different samples that the factor such as manufacturing process, machining precision causes, otherness is less, then consistance is stronger.
The market application of RFID label tag is more and more extensive, and also increase substantially to the demand of label antenna, as communication and the energy acceptance device of electronic tag, the quality of antenna directly has influence on the performance of label thereupon.The detection method of current antenna mainly contains four kinds, and the first is reviewer's visual inspection, and the second is Machine Vision Detection, and the third does electrical property after nation determines chip to detect, and the 4th kind is use probe Meter Test electrical property.Manual Visual Inspection has the following disadvantages: the working strength of visual detection mode reviewer is large; Eyes fatiguability; False retrieval, loss are high; Checkability is low.Machine vision has the following disadvantages: cannot measure electrical property; Very high to the resolution requirement of camera, especially antenna live width or distance between centers of tracks less time; The connection impedance cannot measuring punching press bridging is measured; The position of blocking aluminium foil overlap is not easy to identify.Measure after nation determines chip and have the following disadvantages: cause the proportion of goods damageds of chip to raise, because chip price is high, the price of the far super antenna of the bad waste caused of antenna itself.Probe instrument detects and has the following disadvantages: the impedance of probe self, probes touch impedance, instrument output impedance affect test result; For aluminum antenna because surface compact oxidation layer easily causes probes touch bad; Antenna nation fixed position is little, the little probe positioning difficulty of spacing; Easily leave ugly vestige in probes touch position and affect antenna outward appearance; Because of the efficiency of positioning requirements height impact test, and the cost of precision positioning mechanism is high.
Summary of the invention
The object of the invention is the deficiency existed for RFID label antenna detection method in prior art, providing a kind of can simply, effectively judge the test macro whether label antenna is qualified and method of testing.
To achieve these goals, the invention provides a kind of non-contact testing system of RFID label antenna, comprising: display unit: for showing test results and corresponding data, figure, as the interface of man-machine interaction; Data processing and control module: for configuration and the control of other functional module, sampling, store test data, calculate data, discriminating test result; Unit is sent out/received to radiofrequency signal: under controlling at control module, produce the radiofrequency signal that can cover the certain limit of tested antenna self-resonant frequency on request, and amplify radiofrequency signal to the performance number of specifying, drive test antenna unit emitting radio frequency signal, receive the feedback signal from the tested antenna of test antenna unit and amplify; Test antenna unit: the high-frequency signal for being produced this locality after power amplification is transformed into electromagnetic field and is sent to tested antenna, receive the signal from tested antenna, carry out the frequency tuning of antenna under the control of the control unit according to the signal frequency change of launching, carry out Antenna Impedance Matching adjustment simultaneously;
Feed mechanism unit: under the control of data processing and control module, tested antenna is sent to test position, identifies the defective antenna that test finds; Wherein said data processing and control module send driver element with display unit, radiofrequency signal respectively, feed mechanism unit is connected, and test antenna unit is sent out/received unit and is connected with radiofrequency signal.
Described data processing and control module comprise: control module: for the configuration of other functional module, control and communication; Data processing unit: for data sampling, data transformation, store test data, calculates data, discriminating test result.
Described feed mechanism unit comprises: mechanical mechanism: perform antenna feeding, locate, guarantee the physical construction of stable tension and deviation; Feeding controls: after the instruction accepting control module, be responsible for the working control to mechanical mechanism; Defective products Automatic Logos: provide corresponding acousto-optic hint after each antenna measurement completes, stamp beautiful differentiation automatically to bad antenna.
Described radiofrequency signal is sent out/is received unit and comprises: radiofrequency signal generation unit: produce the radiofrequency signal that can cover the certain limit of tested antenna self-resonant frequency; RF signal power amplifying unit: amplify radiofrequency signal to the performance number of specifying, drives test antenna unit emitting radio frequency signal; Signal reception amplifying unit: receive the feedback signal from the tested antenna of test antenna unit and amplify, sending data processing unit process.
Described test antenna unit comprises: electric tuning matching network: for carrying out the frequency tuning of antenna under the control of the control unit according to the signal frequency change of launching, carry out Antenna Impedance Matching adjustment simultaneously; Test antenna: the high-frequency signal for being produced this locality after power amplification is transformed into electromagnetic field and is sent to tested antenna, receives the signal from tested antenna.
Notch diplexer is provided with between described radio-frequency power amplifier and electric tuning matching network, for isolating receiving and transmitting signal passage, after making power amplification, radiofrequency signal is sent to antenna, the back-scattered signal from tested antenna received by antenna is sent to receiving signal amplifier, realize dual-mode antenna to share, ensure that receiving and transmitting signal meets the requirements of isolation.
Described electric tuning matching network is varactor network, and described notch diplexer is circulator.
Described display unit and control module can adopt computer, and computer connects radiofrequency signal by gpib bus and sends driver element; Or control module adopts microprocessor or PLC, display unit adopts liquid crystal display, and liquid crystal display is by SPI, I
2c or RS232 communication port connects microprocessor, and microprocessor is by SPI, I
2c or parallel port connect radiofrequency signal and send out/receive unit.
To achieve these goals, the invention provides a kind of non-contact type test method of RFID label antenna, comprise the following steps:
(1) control module controls radiofrequency signal generation unit and produces assigned frequency, range signal, and the radiofrequency signal that signal generating unit produces by RF signal power amplifying unit carries out power amplification;
(2) control module controls electric tuning matching network, makes test antenna be operated in the frequency identical with signal generator signal;
(3) amplifying signal is transmitted to tested antenna by test antenna, or be transmitted to tested antenna through notch diplexer, the signal that tested antenna feedback is returned receives via test antenna, the amplitude of the detection signal after Signal reception amplifying unit amplifies of the signal after reception;
(4) range value of control module reading Received signal strength stores and judges whether to reach the final value of test frequency, if do not reach the final value of test frequency, then according to step-length amendment test frequency, repeat step 1 to step 4, until reach the final value of test frequency;
(5) after completing the test of frequency final value, the Received signal strength range value of each frequency stored and normal data are contrasted, if each Received signal strength amplitude data is in the error range of regulation, then tested antenna is qualified.
(6) if each Received signal strength amplitude data is beyond the error range of regulation, then tested antenna is defective, control module sends instruction to display unit, and display unit shows test results, send acousto-optic instruction, and control module controls feed mechanism and identifies on defective antenna;
(7) control module judges whether that whole tested antenna has been surveyed, and as do not tested, control module sends instruction to feed mechanism, and tested for next one antenna is delivered to test position by feed mechanism, starts step 1 and tests to the next round of step 6;
(8) as whole tested antenna has been surveyed, data processing unit is added up test data, and control module controls display unit display result according to statistics, and provides sound and light signal prompting test and all complete.
There is a self-resonant frequency in usual antenna, this frequency and antenna structure, size are closely related.Scale error in the fabrication process, short circuit, open circuit, metal residue etc. all can cause the change of antenna impedance, thus cause the change of antenna self-resonant frequency or the change of Q value.Sent the swept-frequency signal comprising the certain limit of tested antenna self-resonant frequency by test antenna, the signal returning test antenna by detecting tested antenna feedback just can judge that whether tested antenna is qualified.
Be high frequency (HF) antenna for tested antenna, the feedback signal of detection is the impedance variation being coupled to test days line end.Be ultrahigh frequency (UHF) antenna for tested antenna, the feedback signal of detection is Radar Cross Section (RCS) signal of tested antenna.Be received in these feedback signal data in swept frequency range and standard value to carry out contrast and just can obtain testing result.
The simple effective ways obtaining every money tested antenna standard value carry out test to a qualified antenna to obtain, or get the mean value of a combination lattice antenna, can be obtained by the method for testing apparatus automatic learning.
Advantage of the present invention and beneficial effect: the working strength reducing reviewer; False retrieval, loss are low; Can realize Aulomatizeted Detect, detection efficiency is high; The indirect inspection to electrical property can be realized; The measurement to bridging function can be realized; Be applicable to the measurement that aluminium foil overlap blocks antenna; Do not need binding chip (IC) just can test, decrease the loss of chip; Adopt non-contact testing, probe impedance, contact impedance, instrument impedance influences; The requirement of detent mechanism precision is reduced compared with probing test; The contact caused because of aluminum antenna oxide layer is avoided unreliable compared with probe test; Can not impact the outward appearance of antenna compared with probe test.
Need not in advance chip (IC) be tied on tested antenna in the present invention, especially the manufacturer of radio-frequency (RF) identification (RFID) label antenna is applicable to, be no matter antenna is inspected by random samples or entirely examines all applicable, the manufacturing enterprise of electronic tag (Inlay) also can be used as to the means of testing of Incoming Quality Control.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the non-contact testing system of RFID label antenna of the present invention.
Fig. 2 is the structural representation of the concrete unit of non-contact testing system of RFID label antenna of the present invention.
Fig. 3 is the equipment schematic diagram of the embodiment of the present invention one.
Fig. 4 is the equipment schematic diagram of the embodiment of the present invention two.
Fig. 5 is the equipment schematic diagram of the embodiment of the present invention three.
Fig. 6 is the equipment schematic diagram of the embodiment of the present invention four.
Fig. 7 is the resonance frequency analogous diagram of high frequency (HF) standard card antenna when having a chip.
Self-resonant frequency analogous diagram when Fig. 8 is high frequency (HF) standard card antenna chipless.
Specific embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Be the schematic diagram of the non-contact testing system of RFID label antenna of the present invention as shown in Figure 1, Fig. 2 is the structural representation of the concrete unit of test macro.The non-contact testing system of RFID label antenna comprises display unit, data processing and control module, unit is sent out/received to radiofrequency signal, feed mechanism unit and test antenna unit, data processing and control module send driver element with display unit, radiofrequency signal respectively, feed mechanism unit is connected, and test antenna unit is sent out/received unit and is connected with radiofrequency signal.Data processing and control module comprise control module and data processing unit.Radiofrequency signal is sent out/is received unit and comprises radiofrequency signal generation unit, RF signal power amplifying unit and Signal reception amplifying unit.Test antenna unit comprises electric tuning matching network and test antenna.Feed mechanism unit comprises mechanical mechanism, feeding control and defective products Automatic Logos.
Different according to the kind of tested antenna, introduce the non-contact type test method of label antenna respectively.
embodiment one:
Tested antenna is RFID high frequency (HF) antenna, by being with the computer of GPIB general purpose instrument interface bus as control and display unit.Computer is communicated by the radio-frequency signal generator of gpib bus and same belt transect gpib interface, digital voltmeter.
Radio-frequency signal generator and digital voltmeter are connected to computer through GPIB cable and receive program control order, send the data to computer, and computer sends to radio-frequency signal generator the radiofrequency signal that instruction produces assigned frequency and amplitude by gpib bus.
The signal that radio-frequency signal generator produces by broadband rf signal power amplifier carries out power amplification, computer controls resonance matching circuit by serial communication port, make antenna resonant frequency identical with the frequency of radio-frequency signal generator, resonance matching circuit module uses varactor as tuned cell, change the frequency adjustment that varactor bias voltage realizes antenna, the radiofrequency signal after power amplification sends to tested RFID high frequency (HF) antenna through aerial coil.
The impedance coupler of tested antenna is to test antenna coil, the RF signal voltage at test coil two ends is changed with load, the signal voltage at coil two ends delivers to radiofrequency signal detection after receiving signal amplifier amplifies, obtain the range value of signal, the signal amplitude value after detection measured by digital voltmeter.
Computer reads the measurement data of digital voltmeter by gpib bus, according to sample frequency interval amendment test frequency, repeats above-mentioned steps until the frequency range of requirement, obtains one group of measurement data.
By the measurement data that obtains and the tested antenna of normal data multilevel iudge whether qualified, computer monitor shows test results and draws test curve.Along with the tested antenna-coupled of change of signal frequency to the impedance in test antenna coil along with change, close to the impedance marked change of being coupled to during tested antenna self-resonant frequency in test antenna coil, the voltage at coil two ends is obviously changed.
The communication of computer and other component units adopts RS232, RS485, USB or Ethernet.
embodiment two:
Tested antenna is RFIDnt ultra-high frequency (UHF) antenna, and by the computer of band GPIB general purpose instrument interface bus as control and display unit, computer is communicated by the microwave radio signal generator of gpib bus and same belt transect gpib interface, digital voltmeter.
Microwave radio signal generator and digital voltmeter are connected to computer through GPIB cable and receive program control order, send the data to computer, computer sends to microwave radio signal generator the high-frequency signal that instruction produces assigned frequency and amplitude by gpib bus, the signal that microwave radio signal generator produces is carried out power amplification by wide-band microwave RF signal power amplifier, computer controls resonance matching circuit by serial communication port, make antenna resonant frequency identical with the frequency of microwave radio signal generator, electric tuning matching network uses varactor as tuned cell, change the frequency adjustment that varactor bias voltage realizes antenna, microwave radio signal after power amplification is loaded into test antenna by circulator, and be transmitted to tested RFIDnt ultra-high frequency (UHF) antenna.
The change of the signal frequency that the RCS back-scattered signal size of tested antenna produces along with microwave radio signal generator and different.The RCS back-scattered signal that test antenna receives tested antenna sends into wideband low noise receiving signal amplifier (LNA) amplification after circulator, the output signal of wideband low noise receiving signal amplifier (LNA) obtains received signal strength indicator (RSSI) voltage after detection, measures received signal strength indicator (RSSI) magnitude of voltage by digital voltmeter.
Computer reads the measurement data of digital voltmeter by gpib bus, according to sample frequency interval amendment test frequency, repeat above-mentioned steps until the frequency range of requirement, obtain one group of measurement data, by the measurement data that obtains and the tested antenna of normal data multilevel iudge whether qualified, computer monitor shows test results and draws test curve.
The size of the back-scattered signal (RCS) of the tested antenna of the change along with microwave radio signal frequency along with change, can marked change be produced close to the size of back-scattered signal (RCS) during tested antenna self-resonant frequency.
The communication of computer and other component units adopts RS232, RS485, USB or Ethernet.
embodiment three:
Tested antenna is RFID high frequency (HF) antenna, controlled the work of modules as central control unit by microprocessor (MCU), TTF liquid crystal display is connected to microprocessor (MCU) by SPI, I2C or RS232 communication port and shows data, test result, and SD storage card is connected to microprocessor for store test data and configuration data.
Microprocessor (MCU) is by SPI, I
2c or parallel port control direct digital synthesizers (DDS) radio-frequency signal generator module produce assigned frequency signal, the radiofrequency signal that direct digital synthesizers (DDS) produces is carried out power amplification by broadband rf signal power amplifier, microprocessor (MCU) controls digital-to-analogue (D/A) modular converter and exports accurate voltage being biased as varactor, makes antenna tuning in the frequency of direct digital synthesizers (DDS) radiofrequency signal.
Radiofrequency signal after power amplification after tested aerial coil sends to tested RFID high frequency (HF) antenna, the impedance coupler of tested antenna is to test antenna coil, the RF signal voltage at test coil two ends is changed with load, the signal voltage at test antenna coil two ends delivers to radiofrequency signal detection after signal receiving amplifier amplifies, and obtains the range value of signal.
Signal amplitude value after detection send microprocessor (MCU) to process after modulus (A/D) conversion, microprocessor (MUC) reads the data storing after modulus (A/D) conversion in internal RAM or SD memory card, according to sample frequency interval amendment test frequency, repeat above-mentioned steps until the frequency range of requirement, obtain one group of measurement data, by the measurement data that obtains and the tested antenna of normal data multilevel iudge whether qualified.
TTF display screen shows test results and draws test curve, alarm and indicating module provide acousto-optic hint according to the result detected, and tested for next one RFID high frequency (HF) antenna is delivered to test position and tested next time by antenna coiled material feed mechanism.
Along with the tested antenna-coupled of change of radio frequency signal frequency to the impedance in test antenna coil along with change, close to the impedance marked change of being coupled to during tested antenna self-resonant frequency in test antenna coil, the voltage at coil two ends is obviously changed.
The communication of microprocessor and other module adopts SPI, I
2c or parallel port.
embodiment four:
Tested antenna is RFIDnt ultra-high frequency (UHF) antenna, is controlled the work of modules by microprocessor (MCU) as central control unit, and TTF liquid crystal display is by SPI, I
2c or RS232 communication port is connected to microprocessor (MCU) and shows data, test result, and SD storage card is connected to microprocessor for store test data and configuration data.
Microprocessor (MCU) is by SPI, I
2c or parallel port control Microwave Scanning signal generating module produce assigned frequency signal, the microwave signal that Microwave Scanning signal generating module produces is carried out power amplification by wide-band microwave signal power amplifier, microprocessor (MCU) controls digital-to-analogue (D/A) modular converter and exports accurate voltage being biased as varactor, and test antenna is tuned in the signal frequency of Microwave Scanning signal generating module generation.
Microwave signal after power amplification is sent to electric tuning matching circuit module through circulator, be transmitted to tested ultrahigh frequency (UHF) antenna by test antenna, the RCS back-scattered signal size of tested antenna is different along with the change of the signal frequency of Microwave Scanning signal generating module.
The RCS back-scattered signal that test antenna receives tested antenna sends into wideband low noise reception amplifier (LNA) amplification after circulator, the output signal of wideband low noise receiving signal amplifier (LNA) obtains received signal strength indicator (RSSI) voltage after detection, signal amplitude value after detection send microprocessor (MCU) to process after modulus (A/D) conversion, and microprocessor (MUC) reads the data storing after modulus (A/D) conversion in internal RAM or SD memory card.
According to sample frequency interval amendment test frequency, repeat above-mentioned steps until the frequency range that requires, obtain one group of measurement data, by the measurement data that obtains and the tested antenna of normal data multilevel iudge whether qualified.
TTF display screen shows test results and draws test curve, alarm and indicating module provide acousto-optic hint according to the result detected, and tested for next one RFIDnt ultra-high frequency (UHF) antenna is delivered to test position and tested next time by antenna coiled material feed mechanism.
The size of the back-scattered signal (RCS) of the tested antenna of the change along with frequency test signal along with change, can marked change be produced close to the size of back-scattered signal (RCS) during tested antenna self-resonant frequency.
The communication of microprocessor and other module adopts SPI, I
2c or parallel port.
Fig. 7 is the resonance frequency analogous diagram of high frequency (HF) standard card antenna when having a chip, self-resonant frequency analogous diagram when Fig. 8 is high frequency (HF) standard card antenna chipless, the shape of comparison diagram 7 and Fig. 8 known RFID high frequency (HF) antenna frequency characteristic when nation determines chip and do not have a chip self-resonance is identical, can by electrical property during self-resonant frequency characteristic indirect inspection aerial band chip operation.
Self-resonant frequency characteristic for RFIDnt ultra-high frequency (UHF) antenna is more complicated, shape can not be identical, but by obtaining the self-resonant frequency characteristic of qualified antenna as reference, contrasting with test data, also can measure the electrical property of indirect complete twin aerial.
Although the present invention with preferred embodiment openly as above; but embodiment and accompanying drawing are not for limiting the present invention, being anyly familiar with this those skilled in the art, without departing from the spirit and scope of the invention; can make various changes or retouch from working as, but same within protection scope of the present invention.What therefore protection scope of the present invention should define with the claims of the application is as the criterion.
Claims (6)
1. a non-contact testing system for RFID label antenna, is characterized in that comprising:
Display unit: for showing test results and corresponding data, figure, as the interface of man-machine interaction;
Data processing and control module: for configuration and the control of other functional module, sampling, store test data, calculate data, discriminating test result;
Unit is sent out/received to radiofrequency signal: under controlling at control module, produce the radiofrequency signal that can cover the certain limit of tested antenna self-resonant frequency on request, and amplify radiofrequency signal to the performance number of specifying, drive test antenna unit emitting radio frequency signal, receive the feedback signal from the tested antenna of test antenna unit and amplify;
Test antenna unit: the high-frequency signal for being produced this locality after power amplification is transformed into electromagnetic field and is sent to tested antenna, receive the signal from tested antenna, carry out the frequency tuning of antenna under the control of the control unit according to the signal frequency change of launching, carry out Antenna Impedance Matching adjustment simultaneously;
Feed mechanism unit: under the control of data processing and control module, tested antenna is sent to test position, identifies the defective antenna that test finds;
Wherein said data processing and control module send driver element with display unit, radiofrequency signal respectively, feed mechanism unit is connected, and test antenna unit is sent out/received unit and is connected with radiofrequency signal;
Described data processing and control module comprise:
Control module: for the configuration of other functional module, control and communication;
Data processing unit: for data sampling, data transformation, store test data, calculates data, discriminating test result;
Described feed mechanism unit comprises:
Mechanical mechanism: perform antenna feeding, locate, guarantee the physical construction of stable tension and deviation;
Feeding controls: after the instruction accepting control module, be responsible for the working control to mechanical mechanism;
Defective products Automatic Logos: provide corresponding acousto-optic hint after each antenna measurement completes, stamp beautiful differentiation automatically to bad antenna;
Described radiofrequency signal is sent out/is received unit and comprises:
Radiofrequency signal generation unit: produce the radiofrequency signal that can cover the certain limit of tested antenna self-resonant frequency;
RF signal power amplifying unit: amplify radiofrequency signal to the performance number of specifying, drives test antenna unit emitting radio frequency signal;
Signal reception amplifying unit: receive the feedback signal from the tested antenna of test antenna unit and amplify, sending data processing unit process;
Described test antenna unit comprises:
Electric tuning matching network: for carrying out the frequency tuning of antenna under the control of the control unit according to the signal frequency change of launching, simultaneously carry out Antenna Impedance Matching adjustment;
Test antenna: the high-frequency signal for being produced this locality after power amplification is transformed into electromagnetic field and is sent to tested antenna, receives the signal from tested antenna.
2. the non-contact testing system of RFID label antenna according to claim 1, it is characterized in that: between described radio-frequency power amplifier and electric tuning matching network, be provided with notch diplexer, for isolating receiving and transmitting signal passage, after making power amplification, radiofrequency signal is sent to antenna, the back-scattered signal from tested antenna received by antenna is sent to receiving signal amplifier, realize dual-mode antenna to share, ensure that receiving and transmitting signal meets the requirements of isolation.
3. the non-contact testing system of RFID label antenna according to claim 2, is characterized in that: described electric tuning matching network is varactor network.
4. the non-contact testing system of RFID label antenna according to claim 3, is characterized in that: described notch diplexer is circulator.
5. the non-contact testing system of RFID label antenna according to claim 1, is characterized in that: described display unit and control module can adopt computer, and computer connects radiofrequency signal by gpib bus and sends out/receive unit; Or control module adopts microprocessor or PLC, display unit adopts liquid crystal display, and liquid crystal display is by SPI, I
2c or RS232 communication port connects microprocessor, and microprocessor is by SPI, I
2c or parallel port connect radiofrequency signal and send out/receive unit.
6. a non-contact type test method for RFID label antenna, is characterized in that comprising the following steps:
(1) control module controls radiofrequency signal generation unit and produces assigned frequency, range signal, and the radiofrequency signal that signal generating unit produces by RF signal power amplifying unit carries out power amplification;
(2) control module controls electric tuning matching network, makes test antenna be operated in the frequency identical with signal generator signal;
(3) amplifying signal is transmitted to tested antenna by test antenna, or be transmitted to tested antenna through notch diplexer, the signal that tested antenna feedback is returned receives via test antenna, the amplitude of the detection signal after Signal reception amplifying unit amplifies of the signal after reception;
(4) range value of control module reading Received signal strength stores and judges whether to reach the final value of test frequency, if do not reach the final value of test frequency, then according to step-length amendment test frequency, repeat step 1 to step 4, until reach the final value of test frequency;
(5) after completing the test of frequency final value, the Received signal strength range value of each frequency stored and normal data are contrasted, if each Received signal strength amplitude data is in the error range of regulation, then tested antenna is qualified;
(6) if each Received signal strength amplitude data is beyond the error range of regulation, then tested antenna is defective, control module sends instruction to display unit, and display unit shows test results, send acousto-optic instruction, and control module controls feed mechanism and identifies on defective antenna;
(7) control module judges whether that whole tested antenna has been surveyed, and as do not tested, control module sends instruction to feed mechanism, and tested for next one antenna is delivered to test position by feed mechanism, starts step 1 and tests to the next round of step 6;
(8) as whole tested antenna has been surveyed, data processing unit is added up test data, and control module controls display unit display result according to statistics, and provides sound and light signal prompting test and all complete.
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