CN106295448A - Strengthen the method that UHF passive RFID tags group reads precision and reading efficiency - Google Patents
Strengthen the method that UHF passive RFID tags group reads precision and reading efficiency Download PDFInfo
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- CN106295448A CN106295448A CN201610673740.0A CN201610673740A CN106295448A CN 106295448 A CN106295448 A CN 106295448A CN 201610673740 A CN201610673740 A CN 201610673740A CN 106295448 A CN106295448 A CN 106295448A
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
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Abstract
The invention belongs to UHF passive RFID field, especially relate to strengthen the method that UHF passive RFID tags group reads precision and reading efficiency.Enhancing UHF passive RFID tags group provided by the present invention distinguish the method for precision and reading efficiency by frequency-selective surfaces structure is attached at reader antenna launch electromagnetic wave irradiation to interfering object on, passive RFID tags and label appurtenance are between reader antenna and frequency-selective surfaces structure, thus by the filtering microwave absorbing property of frequency-selective surfaces structure, reduce regional metal object residing for label, metallic plate or wall backscatter reader signal intensity, decrease the probability of skip label produced by negative superposition because of back-scattered signal.Additionally, the plan that is arranged on by frequency surface texture is read RFID label tag region and does not plan to read between RFID label tag region, it is possible to effectively prevents read write line string from reading other area label and produces situation about misreading.
Description
Technical field
The invention belongs to UHF passive RFID field, especially relate to strengthen UHF passive RFID tags group and read precision and reading
The method taking efficiency.
Background technology
In RFID group's reading scheme, big owing to reading label amount, the mode of multiple antennas correlation can be used in scheme application,
But so can be because read range controls bad former to thus result in the situation occurring misreading other labels.In view of this, meeting
Using shielding measure in RFID group reads application, most shielding measure uses metal screen because inhaling the cotton high cost of ripple
Cover device.Thing followed problem is, the scattered wave that metal shielding setup produces is to the interference of electromagnetic field of original reading area
Produce skip phenomenon.
In RFID technique is applied to article inbound/outbound process management, can be because the polarised direction of label be sent out with reader antenna
The direction of the electromagnetic wave penetrated is inconsistent, exists and needs to convert article to realize tag reader, also due to wall around label
The reflection of reader antenna signal is caused the full label of reading to lose time very much by wall, ground, metallic plate etc., reduces RFID technique
The convenience that application is brought.
Frequency-selective surfaces (frequency selective surface-FSS), referred to as FSS, is a kind of multidimensional
Periodic structure, this choice structure has good selectivity to transmission and the reflection of electromagnetic wave, in its bandpass range, electricity
Magnetic wave can pass through FSS structure, and in the range of its band hinders, electromagnetic wave is reflected back the most completely, by periodically
The adjustment of structure, design, can obtain different bands and pass to and band resistance scope.
From a structural point, FSS structure is a kind of cycle formed by different permutation and combination by several FSS unit
Property structure, if the frequency of electromagnetic wave is identical with the resonant frequency of FSS unit, FSS can present total transmissivity or total reflection characteristic,
In general the FSS of patch-type presents total reflection characteristic, and the FSS of aperture type presents total transmissivity characteristic.
Summary of the invention
It is an object of the invention to, in order to overcome deficiency of the prior art, it is provided that strengthen UHF passive RFID tags group and read
Precision and the method for reading efficiency.
To this end, the present invention is by the following technical solutions:
Strengthen the method that UHF passive RFID tags group reads precision and reading efficiency, frequency-selective surfaces structure is attached
In reader antenna launch electromagnetic wave irradiation to interfering object on so that passive RFID tags and label appurtenance are in reading
Between device antenna and frequency-selective surfaces structure.Interfering object refers to the stronger metal object of electromagnetic wave backscatter, gold
Belong to plate, wall etc..By the filtering microwave absorbing property of frequency-selective surfaces structure, reduce regional metal object, gold residing for label
Belong to wooden partition or the launched electromagnetic intensity of wall backscatter reader antenna, decrease and leak because back-scattered signal bears superposition
Read the probability of label.
Preferably, described frequency-selective surfaces structure is passive filter structure.
Preferably, read RFID label tag region in plan and do not plan to arrange between reading RFID label tag region frequency selection
Surface texture.Frequency-selective surfaces structure plays shielding action, is also a kind of shielding construction, serves the work of interregional isolation
With, the plan that is arranged on by frequency surface texture is read RFID label tag region and is not planned to read between RFID label tag region, it is possible to
Effectively prevent read write line string from reading other area label and produce situation about misreading.
Preferably, described frequency-selective surfaces structure includes resonant element layer and dielectric substrate layer, described resonant element layer
Being arranged in dielectric substrate layer, described resonant element includes the resonant element of N × M arrangement mode periodically matrix arrangement, often
The figure of individual resonant element and the arranged direction of resonant element in resonant element layer are that identical angle is arranged.Here resonance list
The longitudinal arrangement that arranged direction is matrix arrangement direction of unit or transversely arranged direction.The figure of each resonant element with
The angled setting of resonant element arranged direction in resonant element layer, so can will incide this frequency-selective surfaces structure
On the part of electromagnetic wave reflect back with opposite polarizations direction, the part of polarization conversion is to be determined by the angle arranged
, such as, the figure of resonant element is rotated 45 °, then the half that part is former electromagnetic wave that this polarization converts.So produce
Echo is different with original polarization of ele direction, will not offset former electromagnetic field, and can add that label can read on the contrary can
Can property.If the dielectric material of dielectric substrate layer is foam, resonant element is to be etched by aluminum to be arranged on foam Jie the most afterwards
On matter substrate layer, the most easy to process, cost reduces, lighter in weight.
Preferably, the figure of described resonant element is 45 ° with the arranged direction of resonant element in resonant element layer, resonance list
The figure of unit can become any 45 ° of directions when arranging with the arranged direction of resonant element in resonant element.
Preferably, the thickness of described dielectric substrate layer is launched electromagnetic wave in medium by reader antenna in RFID scheme
The wavelength of 1/4th in substrate layer.
Preferably, the size sum of interval between described resonant element and resonant element is reader in RFID scheme
The launched electromagnetic wave of antenna integral multiple of half-wavelength in dielectric substrate layer.
Preferably, described dielectric substrate is arranged on the metal layer.
Said frequencies select surface texture be arranged in the opposite side of reader antenna, concrete range reader antenna
Antimetropia concrete scheme is determined, the quantity of the resonant element of whole frequency-selective surfaces structure is determined depending on concrete scheme.
The present invention provides and strengthens the method that UHF passive RFID tags group reads precision and reading efficiency, by frequency being selected
Select surface texture be attached at reader antenna launch electromagnetic wave irradiation to interfering object on so that passive RFID tags and label
Appurtenance is between reader antenna and frequency-selective surfaces structure, thus inhales ripple by the filtering of frequency-selective surfaces structure
Characteristic, reduces regional metal object residing for label, metallic plate or wall backscatter reader signal intensity, decrease because
The probability of skip label produced by back-scattered signal and negative superposition.Additionally, frequency surface texture is arranged on plan to read
Take RFID label tag region and do not plan to read between RFID label tag region, it is possible to effectively preventing read write line string from reading other area label
And produce situation about misreading.What is more important, because this frequency-selective surfaces structure has the function in switching polarization direction, makes
The part polarization of electromagnetic wave direction that must be reflected back from this frequency-selective surfaces structure and the polarised direction of incident electromagnetic wave
On the contrary, the former electromagnetic field of reading area will not be offset, on the contrary, because there is the electromagnetism of multiple polarised direction in reading area
Ripple, thus add the electromagnetic wave of multiple polarised direction, add the probability that label is read.
Accompanying drawing explanation
Fig. 1 is the method that enhancing UHF passive RFID tags group provided by the present invention distinguishes precision and reading efficiency
Arrange schematic diagram；
Fig. 2 is the schematic cross-sectional view of frequency-selective surfaces structure provided by the present invention；
Fig. 3 is the graphical layout schematic diagram of the single resonant element of frequency-selective surfaces structure provided by the present invention；
In figure: the frequency-selective surfaces structure of 1-N × Metzler matrix formula arrangement；The UHF passive RFID mark of the random arrangement of 2-
Sign；3-hand-held is made an inventory equipment；101-resonant element layer；102-dielectric substrate layer；103-metal level.
Detailed description of the invention
With specific embodiment, the present invention is described in more detail referring to the drawings.
Embodiment 1
As shown in Figure 1-Figure 3,101 is resonant element layer, and 102 is dielectric substrate layer, and 103 is metal level.Dielectric substrate layer
Dielectric material in 102 is configured according to the demand of concrete scheme, and the thickness of dielectric substrate layer is to read in RFID scheme
The launched electromagnetic wave of device antenna wavelength of 1/4th in dielectric substrate layer.Metal level 103 enters according to the demand of concrete scheme
Row is arranged, it is also possible to be not provided with.
In Fig. 3, anchor pattern is the figure of resonant element.In the present embodiment, the cycle a=70mm of resonant element, is root
It is that foam is designed according to dielectric material, if dielectric material selects other materials, can carry out redesigning adjustment.
Shown in Fig. 1 and Fig. 3, in the figure of each resonant element and resonant element layer the arranged direction of resonant element in
Angle is arranged.The arranged direction of resonant element here is that multiple resonant element is along the vertical or horizontal side being equally spaced
To.In the present embodiment, this angle is 45 °.
Embodiment 2
The method that enhancing UHF passive RFID tags group provided by the present invention distinguishes precision and reading efficiency can be applied
In shops's inventory count scheme.Frequency-selective surfaces structure is arranged between the wall of shops and clothes hanger, it is also possible to it is direct
Being attached on wall, this frequency-selective surfaces structure is formed by N × M resonant element matrix arrangement, the figure of resonant element with
In resonant element layer, the arranged direction of resonant element is 45 °, the interval between two resonant elements and the chi of a resonant element
Both sums very little are the launched electromagnetic wave of reader antenna integral multiple of half-wavelength in dielectric substrate layer in RFID scheme, are situated between
Matter substrate layer uses foamed materials, and the thickness of dielectric substrate layer is 30mm.
In clothing shops, the label on clothes can random arrange, for the hand-held that circular polarisation performance is not so good
Equipment of making an inventory when making an inventory, the frequency-selective surfaces structure the provided electromagnetic wave to inciding in this frequency-selective surfaces structure
There is polarization conversion effect, can aid in and improve hand-held and make an inventory the efficiency of making an inventory of equipment.
Embodiment 3
According to design, make the frequency-selective surfaces structure that 8 × 8 resonant elements are matrix arrangement, same to time-division
Zhi Zuo the area one piece 1mm thick metallic plate identical with this frequency-selective surfaces structure and one piece of concrete walls thick for 20cm
Wall.Using the reflecting antenna of vertical polarization, transmitting signal intensity is 3dBm, and reception antenna is horizontal and vertical two kinds of shapes of polarization
State.The gain launching antenna and reception antenna is 8dBi.Launch antenna and reception antenna side by side and just to test backscatter
Metallic plate or wall, test environment is relatively spacious districts, indoor.
Shown in test result see table:
Being analyzed by test result, the frequency-selective surfaces structure obtained designed by design can be well
Play polarization conversion function, it is possible to meet the back-scattered signal being effectively reduced in polarised direction, solve because residing for label
Regional metal plate or wall backscatter reader signal intensity, decrease the skip label because back-scattered signal bears superposition
Probability.Also indicated that the back-scattered signal in non-polarized direction strengthens by test result simultaneously, former field will not be offset, increase on the contrary
The tagged probability that can read.
Above-mentioned detailed description of the invention be used for illustrate the present invention, only the preferred embodiments of the present invention rather than to this
Invention limits, in the protection domain of spirit and claims of the present invention, and any amendment that the present invention is made, equivalent
Replacement, improvement etc., fall within protection scope of the present invention.
Claims (8)
1. strengthen the method that UHF passive RFID tags group reads precision and reading efficiency, it is characterised in that by frequency-selective surfaces
Structure be attached at reader antenna launch electromagnetic wave irradiation to interfering object on so that passive RFID tags and label appurtenance
It is between reader antenna and frequency-selective surfaces structure.
2. the method reading precision and reading efficiency according to the enhancing UHF passive RFID tags group described in claim 1, it is special
Levying and be, described frequency-selective surfaces structure is passive filter structure.
3. the method reading precision and reading efficiency according to the enhancing UHF passive RFID tags group described in claim 1, it is special
Levy and be, read RFID label tag region in plan and do not plan to arrange between reading RFID label tag region frequency-selective surfaces knot
Structure.
4. read precision and reading efficiency according to the enhancing UHF passive RFID tags group described in any one in claim 1-3
Method, it is characterised in that described frequency-selective surfaces structure includes resonant element layer and dielectric substrate layer, described resonant element
Layer is arranged in dielectric substrate layer, and described resonant element includes the resonant element of N × M arrangement mode periodically matrix arrangement,
The figure of each resonant element and the arranged direction of resonant element in resonant element layer are that identical angle is arranged.
5. the method reading precision and reading efficiency according to the enhancing UHF passive RFID tags group described in claim 4, it is special
Levying and be, the figure of described resonant element is 45 ° with the arranged direction of resonant element in resonant element layer.
6. the method reading precision and reading efficiency according to the enhancing UHF passive RFID tags group described in claim 4, it is special
Levying and be, the thickness of described dielectric substrate layer is launched electromagnetic wave in dielectric substrate layer by reader antenna in RFID scheme
The wavelength of 1/4th.
7. the method reading precision and reading efficiency according to the enhancing UHF passive RFID tags group described in claim 4, it is special
Levying and be, interval and the size sum of resonant element between described resonant element are sent out by reader antenna in RFID scheme
Radio magnetic wave is the integral multiple of half-wavelength in dielectric substrate layer.
8. the method reading precision and reading efficiency according to the enhancing UHF passive RFID tags group described in claim 4, it is special
Levying and be, described dielectric substrate is arranged on the metal layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610673740.0A CN106295448A (en) | 2016-08-16 | 2016-08-16 | Strengthen the method that UHF passive RFID tags group reads precision and reading efficiency |
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| CN201610673740.0A CN106295448A (en) | 2016-08-16 | 2016-08-16 | Strengthen the method that UHF passive RFID tags group reads precision and reading efficiency |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110858271A (en) * | 2018-08-26 | 2020-03-03 | 吴成彬 | Electronic passive tag identification system and method based on frequency selection characteristic |
| CN112219314A (en) * | 2019-04-08 | 2021-01-12 | 郭长来 | Device for reducing antenna interference by radio electromagnetic wave |
| CN114065890A (en) * | 2021-11-22 | 2022-02-18 | 苏州大学应用技术学院 | Identification tag, preparation method thereof and identification method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110858271A (en) * | 2018-08-26 | 2020-03-03 | 吴成彬 | Electronic passive tag identification system and method based on frequency selection characteristic |
| CN110858271B (en) * | 2018-08-26 | 2024-05-14 | 吴成彬 | Electronic passive tag identification system and method based on frequency selection characteristics |
| CN112219314A (en) * | 2019-04-08 | 2021-01-12 | 郭长来 | Device for reducing antenna interference by radio electromagnetic wave |
| CN114065890A (en) * | 2021-11-22 | 2022-02-18 | 苏州大学应用技术学院 | Identification tag, preparation method thereof and identification method |
| CN114065890B (en) * | 2021-11-22 | 2024-05-10 | 苏州大学应用技术学院 | Identification tag, preparation method thereof and identification method |
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Address after: 310015, No. 528, rising road, Yuhang economic and Technological Development Zone, Hangzhou, Zhejiang Applicant after: HANGZHOU SICHUANG HUILIAN TECHNOLOGY CO., LTD. Address before: Hangzhou City, Zhejiang province Gongshu District 310015 Moganshan Road No. 1418-48 Applicant before: HANGZHOU SICHUANG HUILIAN TECHNOLOGY CO., LTD. |
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Application publication date: 20170104 |