CN109543805A - A kind of chipless RFID label for angular transducer - Google Patents
A kind of chipless RFID label for angular transducer Download PDFInfo
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- CN109543805A CN109543805A CN201811533396.0A CN201811533396A CN109543805A CN 109543805 A CN109543805 A CN 109543805A CN 201811533396 A CN201811533396 A CN 201811533396A CN 109543805 A CN109543805 A CN 109543805A
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- rfid label
- circular arc
- chipless rfid
- notching construction
- angle
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/0672—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with resonating marks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C1/00—Measuring angles
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a kind of chipless RFID labels for angular transducer, including radiation patch unit and medium substrate, the radiation patch unit is located at the upper surface of the medium substrate, the radiation patch unit is made of coding unit and positioning unit, the coding unit is made of D type notching construction and circular arc notching construction, the positioning unit is made of two rectangular apertures, and the positioning unit is located between circular arc notching construction and D type notching construction.The rectangular aperture determines the angle on label between rectangular aperture and horizontal X axis direction using the ratio of electric field value of the backscattering electric field in angle to be measured and the electric field value with reference to angle, to obtain the angle of label at this time.The present invention has many advantages, such as low cost, minimizes, is easy to detect in the actual environment, is suitable for internet of things field.
Description
Technical field
The present invention relates to internet of things field, and in particular to a kind of chipless RFID label for angular transducer.
Background technique
Radio frequency identification (Radio Frequency Identification, RFID) technology is to go to detect using radiofrequency signal
The label being attached on object with identification.Radio-frequency recognition system by the label comprising various encoded informations and can mainly identify more
The reader of kind label is constituted.Compared to bar code, RFID has an automatic identification, and it is big etc. excellent that capacity is detected and encoded in non line of sight
Point.These advantages of RFID make it have very big development potentiality in internet of things field.But since traditional RFID label tag needs
IC chip leads to the cost of label costly, it is difficult to large-scale application.Therefore removal IC chip it is low at
The research of this Chip-free label becomes mono- direction given priority to RFID.And chipless RFID label needs to mark in measurement
Label are strictly matched with reader polarization direction, otherwise cannot read accurate label information, and are difficult to protect in actual environment
Card label is strictly matched with the reader moment.
Currently, mainly having following methods for solving chipless RFID label polarization mismatch.One is in tag design
In view of the Rotation of label, designed label within the scope of certain mismatched angles can normal encoding, this method institute
The mismatched angles that can be accommodated are limited, general smaller.Another kind is using dual-polarized tag, and dual-polarized tag is in main polarization and friendship
There is certain mismatched angles range in fork polarization direction, and main polarization and cross polarization is not interfere with each other, and can be accommodated biggish
Mismatched angles, but dual polarization requires two polarization directions that will have excitation, is not easy to measure.
Summary of the invention
In order to overcome shortcoming and deficiency of the existing technology, the present invention provides a kind of chipless for angular transducer
RFID label tag.
The present invention adopts the following technical scheme:
A kind of chipless RFID label for angular transducer, including radiation patch unit and medium substrate, the spoke
The upper surface that chip unit is located at the medium substrate is penetrated, the radiation patch unit is made of coding unit and positioning unit,
The coding unit is made of D type notching construction and circular arc notching construction, and the positioning unit is made of two rectangular apertures, institute
Positioning unit is stated to be located between circular arc notching construction and D type notching construction.
The D type notching construction is located at the top of medium substrate upper surface, is made of three D type fluting nestings, the D type
Notching construction is symmetrical about medium substrate vertical direction middle line.
The circular arc notching construction is located at the lower part of the upper surface of medium substrate, by the circular arc gap and two of two sections of concentrics
The horizontal minor matters gap of item is constituted, and two horizontal minor matters gaps are located at the end in the circular arc gap of two sections of concentrics, and
It is connect with the circular arc gap of two sections of concentrics.
The center of circle in two sections of circular arc gaps of the invention is the central point of medium substrate.
The positioning unit is made of two rectangular apertures, and two rectangular apertures are horizontal positioned, and are parallel to each other.
The medium substrate is single-layer medium substrate, and shape is circle.
The length of two rectangular apertures is different, is greater than by the rectangular aperture length of medium substrate central point and is located at it
The rectangular aperture of lower section.
The two rectangular aperture length is respectively 12.96mm and 11.36mm, width 0.2mm.
Electric field value of the positioning unit of the present invention using backscattering electric field in angle to be measured and the electric field value with reference to angle
Ratio determines the angle α between rectangular aperture and horizontal X axis direction, to obtain the angle of label at this time.
Beneficial effects of the present invention:
(1) present invention only needs to measure the reflected field in the single polarization direction of two fixed frequency points, therefore improves frequency spectrum
Utilization rate, convenient for being measured in practical environment；
(2) positioning unit of the invention is made of two rectangular apertures, need to only measure the reflected field E of angle to be measuredyAnd
Calculate EyWith reference value Ey0Ratio can be obtained the size of angle to be measured, therefore label at a distance from antenna in a certain range
Measurement result is not influenced；
(3) positioning unit of the invention can be applied to other fluting shape labels, have pervasive meaning.
Detailed description of the invention
Fig. 1 is a kind of top view of the chipless RFID label for angular transducer of the present invention；
Fig. 2 is a kind of side view of the chipless RFID label for angular transducer of the present invention；
Fig. 3 is a kind of Parameter Map of the chipless RFID for angular transducer in the present embodiment；
Fig. 4 is a kind of RCS figure of chipless RFID label for angular transducer of the present invention；
Fig. 5 (a) is scattering electric field when a kind of chipless RFID label for angular transducer of the present invention rotates 20 °
Figure；
Fig. 5 (b) is scattering electric field when a kind of chipless RFID label for angular transducer of the present invention rotates 170 °
Figure.
Specific embodiment
Below with reference to examples and drawings, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As Figure 1-Figure 2, a kind of chipless RFID label for angular transducer, including radiation patch unit 1 and
Medium substrate 2, the radiation patch unit are located at the upper surface of medium substrate, and the medium substrate is single-layer medium substrate, tool
Shape is circle.
The radiation patch unit is made of coding unit 3 and positioning unit 4, and the coding unit is by being located at medium substrate
The D type notching construction on the top of upper surface and positioned at medium substrate upper surface lower part circular arc notching construction constitute.The D type is opened
Slot structure is located at the top in the center of circle, is made of three D type gap nestings, the vertical diameter middle line about medium substrate is symmetrical.Three
A D type gap is made of concentric circular arc gap and rectangular aperture, and rectangular aperture is horizontal positioned.Spacing distance in the present embodiment
It is unequal, the circular arc gap outer radius R of the concentric1~R3It is followed successively by 7.6mm, 6.8mm, 5.6mm from big to small.The square
Shape gap and center of circle horizon distance S1~S3It is followed successively by 2.4mm, 1.8mm, 1mm from big to small.
The circular arc notching construction is made of the circular arc gap of two sections of concentrics and two horizontal minor matters gaps, and described two
Horizontal minor matters gap is located at the end in the circular arc gap of two sections of concentrics, and connect with the circular arc gap of two sections of concentrics.
The circular arc gap outer radius R of the concentric circles4、R5It is followed successively by 6.4mm, 6.8mm from big to small.The horizontal detail gap and circle
Heart horizon distance S4For 2.2mm.
The central point of medium substrate is each meant with one heart in the present embodiment, and the circular arc gap opening of concentric circles is towards medium base
The central point of plate.The rectangular aperture in D type gap and is parallel to the rectangular aperture of positioning unit close to the central point of medium substrate.
The positioning unit is spaced apart by two, and the rectangular aperture being parallel to each other is constituted, the positioning unit
Between circular arc notching construction and D type notching construction, two rectangular apertures are horizontal positioned, wherein one is passed through medium substrate
Central point, another and center of circle horizon distance S5For 1.5mm, two rectangular aperture length are unequal.
Positioning unit 4 is made of two rectangular apertures, which realizes the principle of angle measurement are as follows:
It when the vertically polarized wave along Y-axis impinges perpendicularly on label, reflects, a part of incidence wave can be reflected back toward
Come.And the electric field magnitude of backscattering is related with the angle between the direction and rectangular aperture of incident electric fields.When incident electric fields
When direction is parallel with rectangular aperture, rectangular aperture is denoted as L in the length of Y direction at this time, in resonance frequency, Vertical Square at this time
To backscattering electric field magnitude it is maximum and be denoted as reference value Ey0, the scattering electric field of note Y direction unit gap length is E, then
Have
Ey0=L × E (1)
When gap and horizontal X axis direction angle are α (0≤α≤pi/2), i.e., between incident electric fields direction and rectangular aperture
Angle be pi/2-α, rectangular aperture is Lsin α in the effective length of Y direction at this time, then Y-axis reflected field E at this timeyFor
Ey=L × sin α × E (2)
Above-mentioned two formula is compared and can be obtained,
Ey/Ey0=sin α (3)
Therefore, according to the ratio of backscattering electric field electric field value in vertical direction and reference value, so that it may determine square
The shape gap angle α between X-axis at this time, to obtain the angle of label at this time.In order to improve accuracy, the present invention uses two
Rectangular aperture is averaged two obtained angle values.
In the present embodiment, the medium substrate uses RO4003, relative dielectric constant 3.55, dielectric loss angle tangent
It is 0.0027, medium substrate radius is 8mm, and thickness H is 0.5mm.
As shown in figure 3, the design parameter of radiation patch is radiation patch radius R0The center of circle of=8mm, D type gap circular arc is equal
Identical, radius is followed successively by R1=7.6mm, R2=6.8mm and R3=5.6mm.The rectangular aperture and circle center distance in D type gap
It is followed successively by S3=1mm, S2=1.8mm and S1=2.4mm.The circular arc gap outer radius of the concentric circles is followed successively by R4=6.4mm, R5
=6.8mm.The horizontal detail gap and center of circle horizon distance S4For 2.2mm.The rectangular aperture length is followed successively by L1=
12.96mm L2=11.36mm, width W are 0.2mm, and resonance is respectively f1=8.22GHz, f2=9.38GHz.The mark
Label use the vertically polarized wave vertical incidence of Y direction.
As shown in figure 4, RCS simulation result when label polarization direction is matched with reader polarization direction.It can be obtained from the figure that surveying
The Frequency point for measuring electric field is respectively f1=8.22GHz and f2=9.38GHz.And the electricity of scattering when label is rotated by 90 ° is measured in advance
, in f1The scattering electric field E of=8.22GHzy0=-47.91, in f2The scattering electric field E of=9.38GHzy0=-45.03dB makees
For reference value.
As shown in Fig. 5 (a), scattering electric field simulation result when label rotates 20 °.It can be obtained from the figure that dissipating in f1=8.22GHz
Radio field Ey=-47.91dB, in f2The scattering electric field E of=9.38GHzy=-45.03dB；α=23.67 ° can be obtained by being computed, absolutely
It is 3.67 ° to error.
As shown in Fig. 5 (b), scattering electric field simulation result when label rotates 170 °.It can be obtained from the figure that in f1=8.22GHz's
Scattering electric field Ey=-52.48dB, in f2The scattering electric field E of=9.38GHzy=-50.45dB；α=167.01 ° can be obtained by being computed,
Absolute error is -2.99 °.
The angle of label at this time can be obtained in scattering electric field value by measuring two fixed frequency points, can effectively avoid because of day
Reading information errors caused by line and label polarization direction mismatch cannot even read label information.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (9)
1. a kind of chipless RFID label for angular transducer, which is characterized in that including radiation patch unit and medium base
Plate, the radiation patch unit are located at the upper surface of the medium substrate, and the radiation patch unit is by coding unit and positioning
Unit is constituted, and the coding unit is made of D type notching construction and circular arc notching construction, and the positioning unit is by two rectangular slits
Gap is constituted, and the positioning unit is located between circular arc notching construction and D type notching construction.
2. chipless RFID label according to claim 1, which is characterized in that the D type notching construction is located at medium base
The top of plate upper surface is made of three D type fluting nestings, and the D type notching construction is about medium substrate vertical direction middle line
Symmetrically.
3. chipless RFID label according to claim 1, which is characterized in that the circular arc notching construction is located at medium base
The lower part of the upper surface of plate is made of, two horizontal branches the circular arc gap of two sections of concentrics and two horizontal minor matters gaps
Section gap is located at the end in the circular arc gap of two sections of concentrics, and connect with the circular arc gap of two sections of concentrics.
4. chipless RFID label according to claim 3, which is characterized in that the center of circle in two sections of circular arc gaps is medium base
The central point of plate.
5. chipless RFID label according to claim 1, which is characterized in that the positioning unit is by two rectangular apertures
It constitutes, two rectangular apertures are horizontal positioned, and are parallel to each other.
6. chipless RFID label according to claim 1, which is characterized in that the medium substrate is single-layer medium base
Plate, shape are circle.
7. chipless RFID label according to claim 5, which is characterized in that the length of two rectangular apertures is not
Together, it is greater than the rectangular aperture being disposed below by the rectangular aperture length of medium substrate central point.
8. chipless RFID label according to claim 7, which is characterized in that the two rectangular aperture length is respectively
12.96mm and 11.36mm, width 0.2mm.
9. chipless RFID label according to claim 1, which is characterized in that positioning unit is existed using backscattering electric field
The ratio of the electric field value of angle to be measured and the electric field value with reference to angle, determines the angle between rectangular aperture and horizontal X axis direction
α, to obtain the angle of label at this time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811533396.0A CN109543805A (en) | 2018-12-14 | 2018-12-14 | A kind of chipless RFID label for angular transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811533396.0A CN109543805A (en) | 2018-12-14 | 2018-12-14 | A kind of chipless RFID label for angular transducer |
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| Publication Number | Publication Date |
|---|---|
| CN109543805A true CN109543805A (en) | 2019-03-29 |
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ID=65856093
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811533396.0A Pending CN109543805A (en) | 2018-12-14 | 2018-12-14 | A kind of chipless RFID label for angular transducer |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103020557A (en) * | 2012-11-28 | 2013-04-03 | 山西大学 | Core-free radio frequency identification label and identification method thereof |
| WO2013082666A1 (en) * | 2011-12-08 | 2013-06-13 | Monash University | Rfid and apparatus and method therefor |
| CN106295765A (en) * | 2016-08-12 | 2017-01-04 | 华南理工大学 | A kind of ultra broadband polarization chipless RFID label |
| CN206115472U (en) * | 2016-08-12 | 2017-04-19 | 华南理工大学 | Ultra wide band double polarization does not have chip RFID label |
| CN107392298A (en) * | 2017-08-14 | 2017-11-24 | 华南理工大学 | A kind of omnidirectional's chipless RFID label based on angle positioning |
| CN209281442U (en) * | 2018-12-14 | 2019-08-20 | 华南理工大学 | A kind of chipless RFID label for angular transducer |
-
2018
- 2018-12-14 CN CN201811533396.0A patent/CN109543805A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013082666A1 (en) * | 2011-12-08 | 2013-06-13 | Monash University | Rfid and apparatus and method therefor |
| CN103020557A (en) * | 2012-11-28 | 2013-04-03 | 山西大学 | Core-free radio frequency identification label and identification method thereof |
| CN106295765A (en) * | 2016-08-12 | 2017-01-04 | 华南理工大学 | A kind of ultra broadband polarization chipless RFID label |
| CN206115472U (en) * | 2016-08-12 | 2017-04-19 | 华南理工大学 | Ultra wide band double polarization does not have chip RFID label |
| CN107392298A (en) * | 2017-08-14 | 2017-11-24 | 华南理工大学 | A kind of omnidirectional's chipless RFID label based on angle positioning |
| CN209281442U (en) * | 2018-12-14 | 2019-08-20 | 华南理工大学 | A kind of chipless RFID label for angular transducer |
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