CN102213750A - Testing method and system for performance of RFID (Radio Frequency Identification Device) reader antenna - Google Patents

Testing method and system for performance of RFID (Radio Frequency Identification Device) reader antenna Download PDF

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CN102213750A
CN102213750A CN2011100505731A CN201110050573A CN102213750A CN 102213750 A CN102213750 A CN 102213750A CN 2011100505731 A CN2011100505731 A CN 2011100505731A CN 201110050573 A CN201110050573 A CN 201110050573A CN 102213750 A CN102213750 A CN 102213750A
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test
grid
groove
testing
reader
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叶永嘉
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Abstract

The invention relates to a testing method and system for the performance of an RFID (Radio Frequency Identification Device) reader antenna, belonging to the technical field of a radio frequency identification. The concrete testing method provided by the invention comprises the following steps: designing a grid testing board; placing a reader to be tested into a testing bracket in the mode that the front surface is upward; horizontally placing the grid board on the reader in the mode that the grid surface is upward; sequentially placing testing probes into each grid of the grid board; and reading and recording the numerical value of the intensity of each magnetic field through a field intensity tester, thereby obtaining the performance of the RFID reader antenna in free space. The designed testing system provided by the invention comprises a three-groove testing bench, a grid cover plate, the testing probes and the filed intensity tester, wherein the grid cover plate is placed in the third groove of the three-groove testing bench to form a closed structure. The invention can be effectively applied to the reading of electromagnetic field distribution on a certain distance plane above the reader, can conveniently and flexibly measure the reliable working region and direction sensitivity of the electromagnetic field distribution and can be applied to the field of RFID testing, particularly in the application of mobile payment.

Description

A kind of method of testing and system of RFID reader antenna performance
Technical field
The present invention relates to a kind of method of testing and system of RFID reader antenna performance, belong to the REID field.
Background technology
REID (Radio Frequency Identification, abbreviation RFID), be a kind of automatic identification technology that begins to rise the nineties in 20th century, REID is one and utilizes radiofrequency signal to realize that by space coupling (alternating magnetic field or electromagnetic field) contactless information transmission and the information of passing through to be transmitted reach the technology of identifying purpose.
Ultimate principle from the information transmission, REID in low-frequency range based on transformer coupled model (NE BY ENERGY TRANSFER between elementary and secondary and signal transmission), at high band based on the space coupling model of radar detection target (radar emission electromagnetic wave signal run into target then carry target information return radar receiver)." utilizing the communication of reflective power " that Harry's Stockman in 1948 is delivered established the theoretical foundation of REID.
For the performance of testing radio frequency identification aerial, researcher has been done a lot of correlative studys.
The patent No. is that 200810239330 " a kind of Benchmark test system and method for RFID label operation level " regards RFID label chip and antenna as integral body, with the propagation formula of electromagnetic wave at free space, input and output level by reference and dual-mode antenna measure R FID tag system, reckoning can activate the minimum levels of RFID label work, and the theory to the RFID label reads the distance assessment again.By the RFID label power consumption of one of important indicator of decision RFID tag performance is carried out science, can repeat, comparable non-cpntact measurement, solve the problem that the prior art index is indeterminate, the test result error is big, for the user selects the RFID label product that the aid decision making foundation is provided according to the different application demand.
The patent No. is that the described method of testing of 200910193540 " a kind of method and apparatus of testing receiving sensitivity of RFID reader " comprises, reader emission local oscillator carrier signal is intercepted the tag responses signal simultaneously; The local oscillator carrier signal of reader emission inputs to first circulator after the barrier reflection, first circulator carries the local oscillator carrier signal to the tag responses signal simulator; The tag responses signal simulator to the local oscillator carrier signal modulate, decay and merit divisional processing, generate first via label simulating signal and second road sign label simulating signal that power equates, first via label simulating signal power input meter, second road sign is signed simulating signal and is imported first circulator, and first circulator is imported second road sign and signed the receiving end of simulating signal to reader.Its testing apparatus comprises reader, first circulator, tag responses signal simulator and power meter.This technical scheme can be accurately, the receiving sensitivity of testing RFID reader quickly and easily.
But the method and apparatus of above patent has all adopted circulator, receives and dispatches the conversion of energy, the proving installation complexity; The rig-site utilization inconvenience.
Generally, the RFID reader has possessed contour structures as product, but still needs to test the field strength distribution under its duty in actual applications; When electronic tag and handset binding carry out mobile payment and use, more need to understand the field strength distribution and the full test distance of different card reader top, above patent can't be tested existing RFID reader antenna performance.
According to Theory of Electromagnetic Field, the calculation expression that Biot-Sha cuts down law explanation current return some magnetic induction density that is produced in the space is:
B = μ 4 π ∫ l Idl × e R R 2
Wherein, B is a magnetic induction density, and R is the distance of space any point, and I is a current in loop intensity, and e is a unit vector.
Reader antenna is made of a plurality of current returns, cuts down law according to Biot-Sha, induces electromagnetic field equally in its surrounding space; Electronic tag also is to be made of a plurality of current returns, has an electromagnetic field that is cross-linked with each other between reader and the electronic tag; When electronic tag was integrated into mobile phone terminal, this crosslinked electromagnetic field was because the influence of cell phone rear cover or battery etc. can change, and the present invention then can test and obtain the numerical value that this crosslinked electromagnetic field distributes.
Summary of the invention
The objective of the invention is the test of RFID reader antenna electromagnetic field distribution to be proposed a kind of easy RFID reader antenna performance test methods and system in order to realize.
RFID reader antenna performance test methods of the present invention specifically comprises the steps:
Step 1 designs a grid test board, and the size of each grid is equal to the size of test probe, and in test process, the grid of regulation diagonal line one end is designated as first test point, and the grid of the other end is designated as last test point.
Step 2, tested reader faced up to be put in the test bracket, places the check board of step 1 design above reader, and grid is towards last horizontal positioned; Test probe is connected with field test instrument, enters the test standby condition.
Step 3 on the basis of step 2, is positioned over test probe in first grid of check board, reads the field strength value of this point and keeps a record by field test instrument.
Step 4 on the basis of step 3, is positioned over horizontal second grid contiguous with first grid with test probe, reads the field strength value of this point and keeps a record, and test all grids of first horizontally-arranged successively.
Step 5 on the basis of step 4, is positioned over contiguous vertical second grid of first grid with test probe, reads the field strength value of this point and keeps a record, and test all grids of second horizontally-arranged successively.
Step 6 is analogized according to the method for step 5, tests the grid of all horizontally-arrangeds successively, reads field strength value and keeps a record; Up to testing last test point.
According to measured data the distribution of the working face internal magnetic field intensity of reader top certain distance is analyzed, thereby learnt the performance of RFID reader antenna in free space.
Above-mentioned steps 3 also is applicable to test to electric field intensity with test probe to the test of magnetic field intensity to step 6 is described.Distribution situation by electric field intensity also can be learnt the performance of RFID reader antenna in free space.
Be the performance under the test reader duty, electronic tag or the portable terminal that is integrated with electronic tag can be overlayed on the test probe that repeating step 3 is to step 6, test obtaining reader is having the electromagnetic field under the electronic tag coupling situation to distribute.
RFID reader antenna Performance Test System according to method of testing design of the present invention comprises three groove testing jigs, grid cover plate, test probe and field test instrument.
Described three groove testing jigs adopt low scattering material to make, and as the support of reader, can keep reader antenna face level.Testing jig is the spatial structure that there are three layers of groove at the center, upwards is respectively first groove, second groove and the 3rd groove from the bottom, and the second groove edge is positioned at the centre at the first groove edge and the 3rd groove edge.Is carved with a sulculus respectively in the middle of the both sides cell wall of the 3rd groove, so that the picking and placeing of grid cover plate.Second groove is used to place the RFID reader, and the structure of reader places in first groove, and first bottom portion of groove is provided with the power lead outlet.
Described grid cover plate adopts low scattering material to make, and its length and width are the same with the length and width of the 3rd groove, and thickness is set according to actual test request; It is decorated with n * m grid (n, m are arbitrary integer) upward.The size and the test probe of each grid are measure-alike, to reach the purpose in complete coverage test zone.
Described test probe is common RFID antenna probes, meets the ISO14443 standard, and the reader antenna that is used to be coupled transmits.
Described field test instrument is common electromagnetic field intensity tester, as the numerical value of measuring electric field or magnetic field intensity.
The annexation of above-mentioned each ingredient is: the grid of grid cover plate towards on be placed in the 3rd groove of three groove testing jigs and form closed structure, test probe links to each other with field test instrument, probe on the cover board moves and carries out field strength measurement.
The course of work of test macro of the present invention is: tested reader is positioned in second groove of three groove testing jigs, makes its surface level, its power unit is connected with external power source by the outlet of the first groove power lead; Add a cover the grid cover plate on the reader surface, and complete coverage test zone, its grid zone; Test probe is connected with field test instrument, enter duty; Test probe is positioned in each grid of grid cover plate, finishes the test of all grids, data recording is inserted predefined data form carry out next step analysis.
Beneficial effect
What the present invention can be effectively applied to that electromagnetic field on the certain distance plane, reader top distributes reads, and can record its reliably working district and direction and sensitivity easily and flexibly.Testable reader performance comprises: (1) work field strength measurement; (2) maximum read distance test; (3) direction and sensitivity test.
The present invention can be applied in the RFID field tests.Particularly in mobile payment is used, insert electronic tag in the mobile phone, this tag performance is subjected to the influence of battery of mobile phone, cell phone rear cover and mobile phone appearance structure and material, can be with the convenient readwrite performance that reads the electronic tag in the mobile phone effectively of this method.
Description of drawings
Fig. 1 is the process flow diagram of method of testing of the present invention;
Fig. 2 is three groove testing jig structure vertical views of test macro of the present invention;
Fig. 3 is three groove testing jig section of structures of test macro of the present invention;
Fig. 4 is three groove testing jig texture edge figure of test macro of the present invention;
Fig. 5 is the grid covering plate structure synoptic diagram of test macro in the embodiment;
Fig. 6 is three groove testing jig perspective view of test macro of the present invention.
Label declaration:
1-first groove, 2-second groove, 3-the 3rd groove, 4-sulculus, the outlet of 5-power lead.
Embodiment
For better explanation objects and advantages of the present invention, the present invention is described in further detail below in conjunction with drawings and Examples.
The test instrumentation of present embodiment mainly is made up of electromagnetic radiation frequency-selecting analyser and test probe, the frequency-selecting analyser adopts the NF-5035 high sensitivity testing analyser of German An Nuoni company, test probe is the small coil antenna that meets the ISO14443 standard, pops one's head in to be the square of 3 centimetres of the length of sides; Probe is connected by concentric cable with field intensity meter.The JY11 type intelligent reader that tested reader provides for MOTOROLA company in the present embodiment, the upper surface size of reader is for long 10 centimetres, and is wide 8 centimetres.
Three groove testing jigs of present embodiment adopt polyurethane material, almost to not influence of electromagnetic field, are easy to moulding, at the reader of different model, can adopt this material test bracket cheaply.Structure such as Fig. 2 of this three grooves testing jig, Fig. 3, Fig. 4 and shown in Figure 6.Wherein, the size of second groove 2 is for long 10 centimetres, and is wide 8 centimetres; First groove, 1 bottom is provided with power lead outlet 5.
The grid cover plate adopts same polyurethane material, cuts into the square plate of certain altitude, and draws on one side and 9 square centimeters/grid of test probe consistent size with ruler and pen, totally 6 * 7 grids, as shown in Figure 5.
Utilize the testing procedure of field strength distribution of test system and test reader free space of present embodiment as follows:
Step 1, the test point in zone, the regulation grid cover plate upper left corner is designated as first test point, and the test point in zone, the lower right corner is designated as last test point;
Step 2, tested reader faced up to be put in the test bracket of three groove structures, places the grid cover plate above reader, and grid is towards last horizontal positioned; Test probe is connected with electromagnetic radiation frequency-selecting analyser, enters the test standby condition;
Step 3 on the basis of step 2, is positioned over test probe in first grid of check board, reads the field strength value of this point and keeps a record;
Step 4, on the basis of step 3, the use test probe tests six grids of first horizontally-arranged successively and successively field strength value is recorded in the table 1;
Step 5, on the basis of step 4, the use test probe tests second horizontally-arranged all grids to seventh rank successively, and successively field strength value is recorded in the table 1.
Can draw from the test result of table 1: center, reader top (laterally 6cm is interior to the scope of vertical 18cm to horizontal 15cm and vertical 12cm) field intensity maximum, get over off-center, field intensity is weak more; But find in the actual test that horizontal 9 centimetres of vertical 9 centimeters of reader and horizontal 12 centimetres of vertical 9 centimeters field intensity are lower than numerical value on every side, illustrate that reader performance is not so good herein.Test result provides reference for further improving its sensitivity behaviour.The test number of above magnetic field intensity can be transformed to electric field intensity by mathematical relation, similarly, utilizes different instrument tests to obtain the numerical value of electric field intensity, also can be transformed to magnetic field intensity by mathematical relation.
Table 1 field strength distribution test chart
Vertically horizontal 3cm 6cm 9cm 12cm 15cm 18cm
3cm 5.7 6.8 8.0 8.2 7.4 5.7
6cm 9.4 12.1 13.2 13.6 12.1 9.3
9cm 14.6 11.8 5.1 4.3 10.9 14.0
12cm 15.5 39.6 42.1 42.1 40.3 14.5
15cm 13.4 42.2 42.2 42.2 42.0 13.2
18cm 13.1 42.6 42.3 41.9 42.0 12.7
21cm 13.6 7.9 30.6 27.8 5.3 14.1
When reality is tested the maximum read distance of reader,, repeatedly test according to the grid cover plate of test request making different-thickness.Along with the increase of grid cover sheet thickness, the height on test probe range reader surface constantly increases, and electromagnetic intensity constantly weakens, and may some position can not read numerical value at one in apart from the plane; It is necessary to carry out trafficability characteristic test, the step 3-step 6 in the repeated test method is noted the process that reads of different-thickness, can read be designated as " by ", that can not read is designated as " by ".Trafficability characteristic test case when table 2 is depicted as the grid cover sheet thickness and is 5 centimetres according to the data of table 2, can illustrate mobile phone at diverse location, and the reasonable zone of card reader performance is horizontal 6-12 centimetre vertical 6-12 centimetre.
Table 2 trafficability characteristic test chart (not passing through to beat *) by beating √
Vertically horizontal 3cm 6cm 9cm 12cm 15cm 18cm
3cm × × × × × ×
6cm × √ √ √ × ×
9cm × √ √ √ × ×
12cm × √ √ √ × ×
15cm × × × × × ×
18cm × × × × × ×
21cm × × × × × ×

Claims (5)

1. the method for testing of a RFID reader antenna performance is characterized in that: specifically comprise the steps:
Step 1 designs a grid test board, and the size of each grid is equal to the size of test probe, and in test process, the grid of regulation diagonal line one end is designated as first test point, and the grid of the other end is designated as last test point;
Step 2, tested reader faced up to be put in the test bracket, places the check board of step 1 design above reader, and grid is towards last horizontal positioned; Test probe is connected with field test instrument, enters the test standby condition;
Step 3 on the basis of step 2, is positioned over test probe in first grid of check board, reads the field strength value of this point and keeps a record by field test instrument;
Step 4 on the basis of step 3, is positioned over horizontal second grid contiguous with first grid with test probe, reads the field strength value of this point and keeps a record, and test all grids of first horizontally-arranged successively;
Step 5 on the basis of step 4, is positioned over contiguous vertical second grid of first grid with test probe, reads the field strength value of this point and keeps a record, and test all grids of second horizontally-arranged successively;
Step 6 is analogized according to the method for step 5, tests the grid of all horizontally-arrangeds successively, reads field strength value and keeps a record; Up to testing last test point;
According to measured data the distribution of the working face internal magnetic field intensity of reader top certain distance is analyzed, thereby learnt the performance of RFID reader antenna in free space.
2. the method for testing of a kind of RFID reader antenna performance according to claim 1 is characterized in that: described step 3 also is applicable to test to electric field intensity with test probe to the test of magnetic field intensity in the step 6.
3. the method for testing of a kind of RFID reader antenna performance according to claim 1, it is characterized in that: electronic tag or the portable terminal that is integrated with electronic tag are overlayed on the test probe, repeating step 3 is to step 6, and test obtains reader is having the electromagnetic field under the electronic tag coupling situation to distribute.
4. the test macro of a RFID reader antenna performance is characterized in that: comprise three groove testing jigs, grid cover plate, test probe and field test instrument;
Described three groove testing jigs adopt low scattering material to make, and keep reader antenna face level; Testing jig is the spatial structure that there are three layers of groove at the center, upwards is respectively first groove, second groove and the 3rd groove from the bottom, and the second groove edge is positioned at the centre at the first groove edge and the 3rd groove edge; Be carved with a sulculus respectively in the middle of the both sides cell wall of the 3rd groove; Second groove is used to place the RFID reader, and the structure of reader places in first groove, and first bottom portion of groove is provided with the power lead outlet;
Described grid cover plate adopts low scattering material to make, and its length and width are the same with the length and width of the 3rd groove; It is decorated with n * m grid (n, m are arbitrary integer) upward; The size and the test probe of each grid are measure-alike;
Described test probe is common RFID antenna probes, meets the ISO14443 standard, and the reader antenna that is used to be coupled transmits;
Described field test instrument is common electromagnetic field intensity tester;
The annexation of above-mentioned each ingredient is: the grid of grid cover plate towards on be placed in the 3rd groove of three groove testing jigs and form closed structure, test probe links to each other with field test instrument, probe on the cover board moves and carries out field strength measurement.
5. the test macro of a kind of RFID reader antenna performance according to claim 4 is characterized in that: described grid cover sheet thickness is set according to actual test request.
CN2011100505731A 2011-03-03 2011-03-03 Testing method and system for performance of RFID (Radio Frequency Identification Device) reader antenna Pending CN102213750A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104050561A (en) * 2014-06-20 2014-09-17 成都联星微电子有限公司 Financial payment system based on RFID
CN107248288A (en) * 2017-06-28 2017-10-13 北京易华录信息技术股份有限公司 A kind of vehicle fault detection method and device based on vehicle electron identifying
CN108051657A (en) * 2017-12-19 2018-05-18 北京计算机技术及应用研究所 A kind of radio field intensity detecting system based on UWB and UHF-RFID
CN108492384A (en) * 2018-05-25 2018-09-04 海涛 Earth magnetism vehicle simulator, the calibrating installation of parking timing and charging system and method
CN109061443A (en) * 2018-08-27 2018-12-21 国网江苏省电力有限公司电力科学研究院 A kind of electric label-sensitivity test method eliminating fixture and influencing
CN109325375A (en) * 2018-09-29 2019-02-12 飞天诚信科技股份有限公司 A kind of contactless smart card card-reading terminal and its working method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104050561A (en) * 2014-06-20 2014-09-17 成都联星微电子有限公司 Financial payment system based on RFID
CN107248288A (en) * 2017-06-28 2017-10-13 北京易华录信息技术股份有限公司 A kind of vehicle fault detection method and device based on vehicle electron identifying
CN108051657A (en) * 2017-12-19 2018-05-18 北京计算机技术及应用研究所 A kind of radio field intensity detecting system based on UWB and UHF-RFID
CN108051657B (en) * 2017-12-19 2020-06-16 北京计算机技术及应用研究所 Radio frequency field intensity detection system based on UWB and UHF-RFID
CN108492384A (en) * 2018-05-25 2018-09-04 海涛 Earth magnetism vehicle simulator, the calibrating installation of parking timing and charging system and method
CN108492384B (en) * 2018-05-25 2023-09-19 海涛 Geomagnetic vehicle simulator, verification device and method for parking timing charging system
CN109061443A (en) * 2018-08-27 2018-12-21 国网江苏省电力有限公司电力科学研究院 A kind of electric label-sensitivity test method eliminating fixture and influencing
CN109061443B (en) * 2018-08-27 2023-06-20 国网江苏省电力有限公司电力科学研究院 Electronic tag sensitivity test method for eliminating clamp influence
CN109325375A (en) * 2018-09-29 2019-02-12 飞天诚信科技股份有限公司 A kind of contactless smart card card-reading terminal and its working method

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Application publication date: 20111012