CN110247179A - It is a kind of to can recognize the UHF near field RFID reader antenna for arbitrarily putting label - Google Patents
It is a kind of to can recognize the UHF near field RFID reader antenna for arbitrarily putting label Download PDFInfo
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- CN110247179A CN110247179A CN201910536372.9A CN201910536372A CN110247179A CN 110247179 A CN110247179 A CN 110247179A CN 201910536372 A CN201910536372 A CN 201910536372A CN 110247179 A CN110247179 A CN 110247179A
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- 239000002184 metal Substances 0.000 claims abstract description 8
- 238000005452 bending Methods 0.000 claims description 15
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- 238000010586 diagram Methods 0.000 description 10
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
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- 238000010835 comparative analysis Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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Abstract
It can recognize any UHF near field RFID reader antenna for putting label the present invention provides a kind of, including dielectric-slab, dielectric-slab is equipped with metal layer, metal layer includes two and is mutually perpendicular to but dipole that length is different, and the two-arm equal length of any one dipole, position are parallel and not conllinear in two dipoles.Including the first dipole and the second dipole, the first dipole includes the first arm and the second arm, and the second dipole includes third arm and the 4th arm；First dipole and the second dipole are mutually perpendicular to but length is different；First arm and the second arm lengths are equal, and parallel to each other and not conllinear, third arm and the 4th arm lengths are equal, parallel to each other and not conllinear.
Description
Technical field
The present invention relates to Electromagnetic Field and Microwave Technology fields, especially a kind of to can recognize the near field UHF for arbitrarily putting label
RFID reader antenna.
Background technique
UHF near field RFID systems are wide with advantages such as high transmission rates, high read-write rate and remote identifications due to it
It is applied to the fields such as modern Intelligent logistics, warehousing management, industrial sensor generally.Reader antenna as wherein most critical one
Ring, its performance often determine the superiority and inferiority of system performance.Reader antenna in the design process, usually only considers and antenna table
The magnetic-field component intensity of face vertical direction, because generally requiring that the surface of near field tag and reader antenna surface are mutually flat
Row.However, in practical applications, the placement position of near field tag be it is any and random, this will will lead to conventional reader day
The discrimination of line is lower, and there are identification blind areas.It addresses that need, reader antenna needs three dimensions in its near-field region
Sufficiently strong and uniform magnetic field is generated on degree, this is a research hotspot in recent years.
For traditional loop antenna, component intensity of the near field magnetic field in vertical antenna surface direction is strong and uniform, but
There can be the extremely weak region of intensity with the component of antenna surface parallel direction, this will make loop antenna that can not identify perpendicular to its table
The label that face is put leads to the generation for identifying blind area.Currently, the reader antenna of most uhf bands is asked in the presence of this
Topic, or have ignored and the Distribution of Magnetic Field situation for being parallel to antenna surface direction is studied.
Summary of the invention
Goal of the invention: the technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide a kind of can recognize
Arbitrarily put the UHF near field RFID reader antenna of label.
It can recognize any UHF near field RFID for putting label in order to solve the above-mentioned technical problems, the present invention provides a kind of
Reader antenna, including dielectric-slab, dielectric-slab are equipped with metal layer, and metal layer includes two and is mutually perpendicular to but idol that length is different
Extremely sub, the two-arm equal length of any one dipole, position are parallel and not conllinear in two dipoles.
In the present invention, including the first dipole and the second dipole, the first dipole includes the first arm and the second arm, and second
Dipole includes third arm and the 4th arm；
First dipole and the second dipole are mutually perpendicular to but length is different；
First arm and the second arm lengths are equal, and parallel to each other and not conllinear, third arm and the 4th arm lengths are equal, mutually equal
It goes and not conllinear.
In the present invention, the distance between parallel lines where the first arm and the second arm and parallel lines where third arm and the 4th arm
The distance between differ.
In the present invention, the first arm connects third arm, and the second arm connects the 4th arm.
In the present invention, the length of any one dipole is slightly shorter than 1/2nd wavelength, and uhf band is 860~960MHz,
Wavelength is the corresponding wavelength of 915MHz herein.
In the present invention, the distance between parallel lines where the first arm and the second arm are put down where being greater than third arm and the 4th arm
The distance between line, length of first dipole length less than the second dipole.
In the present invention, the distance between parallel lines where the first arm and the second arm are put down where being less than third arm and the 4th arm
The distance between line, the first dipole length are greater than the length of the second dipole.
In the present invention, it is equipped with current feed terminal away from the side of metal layer on dielectric-slab, current feed terminal is connected respectively to first
The junction and the second arm of arm and third arm and the junction for connecing the 4th arm, convenient for test.
In the present invention, the junction of first arm and third arm is provided with the first bending angle, the second arm and the 4th arm
Junction is provided with the second bending angle, so that enhancing the near field magnetic field strength of reader antenna, reduces the generation of identification blind area.
The utility model has the advantages that this antenna, which has broken label antenna, is only parallel with the limitation that reader antenna surface is put；Structure
It is simple and compact, and there is good impedance matching performance.
Detailed description of the invention
The present invention is done with reference to the accompanying drawings and detailed description and is further illustrated, it is of the invention above-mentioned or
Otherwise advantage will become apparent.
Fig. 1 a is the schematic three dimensional views of the ultra wide band cross type reader antenna for UHF near field RFID；
Fig. 1 b is design parameter mark figure；
Fig. 2 is the simulation result diagram of reader antenna return loss proposed by the invention；
Fig. 3 is the magnetic field x-component right above reader antenna proposed by the invention at 50mm | Hx| along the distribution of y-axis
Figure；
Fig. 4 is the magnetic field y-component right above reader antenna proposed by the invention at 50mm | Hy| along the distribution of y-axis
Figure；
Fig. 5 is the magnetic field z-component right above reader antenna proposed by the invention at 50mm | Hz| along line y=x's
Distribution map；
Fig. 6 a is example structure schematic diagram；
Fig. 6 b is the first bending part and the second bending part schematic diagram.
Fig. 7 a is the antenna schematic diagram for bending corner structure；
Fig. 7 b is the antenna schematic diagram of right-angle structure；
Fig. 8 is reflection coefficient comparison diagram；
Fig. 9 a is x-component | Hx| along the distribution schematic diagram of y-axis；
Fig. 9 b is y-component | Hy| along the distribution schematic diagram of y-axis；
Figure 10 magnetic-field component | Hz| along the distribution schematic diagram of line y=x.
Specific embodiment
It elaborates below in conjunction with attached drawing to the present invention.
Embodiment 1:
A kind of such as Fig. 1 a institute of the ultra wide band cross type reader antenna for UHF near field RFID of the present embodiment design
Show, the metal layer 2 including dielectric-slab 1 and medium plate top surface.First dipole 2 includes the first arm 2a and the second arm 2b, and second is even
Extremely son 3 includes third arm 3a and the 4th arm 3b；
First dipole 2 is mutually perpendicular to the second dipole 3 but length is different；
First arm 2a and the second arm 2b equal length, parallel to each other and not conllinear, third arm 3a and the 4th arm 3b length phase
Deng parallel to each other and not conllinear.
The distance between parallel lines where first arm 2a and the second arm 2b and parallel lines where third arm 3a and the 4th arm 3b
The distance between differ.
The distance between parallel lines are less than where third arm 3a and the 4th arm 3b in parallel where first arm 2a and the second arm 2b
The distance between line, the first dipole length are greater than the length of the second dipole.
The length and width of dielectric-slab as shown in Figure 1 b are L, with a thickness of h, a length of l of dipole single armed put along y-axis1,
The long l of dipole single armed put along x-axis2, the line width of two dipoles is w.
Ultra wide band cross type reader antenna of the working frequency of this antenna in 920MHz, the dielectric of medium substrate
Constant is 4.4, and the length and width of medium substrate are L=80mm, and with a thickness of h=1.6mm, the big single armed length of two dipoles is respectively
l1=62mm and l2=54mm, line width are w=3mm.
Fig. 2 is the emulation using commercial full-wave simulation software HFSS to the reader antenna reflection coefficient with above-mentioned size
Result figure.From figure 2 it can be seen that the operational frequency bandwidth of -10dB of the reader antenna is about 180MHz, from 840MHz to
1020MHz, relative bandwidth are about 19.3% bandwidth for being much larger than general wire antenna.This bandwidth covers global UHF near field RFID
The specification (860MHz~960MHz) of frequency range.
In order to verify the near field magnetic field performance of the present embodiment, Fig. 3 and Fig. 4 be near field magnetic field x and y durection component (| Hx| and |
Hy|) along the distribution situation figure of y-axis, Fig. 5 give near field magnetic field z durection component (| Hz|) along the distribution of line y=x.If with
Magnetic field strength -30dBA/m is boundary, | Hx| it is better than this value within the scope of -160mm≤x≤160mm, | Hy| it is better than boundary value
Range is smaller (about -140mm≤x≤140mm), and | Hz| in entire scope (- 200mm≤y=x≤200mm) be all larger than-
30dBA/m.This means that the reader antenna of the present embodiment can generation intensity be strong on three-dimensional in the large area of near field
And more uniform Distribution of Magnetic Field, be conducive to identify the label that any position is put, be provided for UHF near field RFID reader antenna
New mentality of designing.
This antenna only generates the spy of the direction y and z magnetic-field component using the dipole put along x-axis in its near-field region
Property, by two orthogonal disposing ways of dipole, so that reader antenna is three-dimensional in its near-field region larger area
Sufficiently strong and more uniform magnetic field is capable of providing on direction.
The total length of dipole determines the working frequency and bandwidth of antenna, and the total length for changing dipole can be neatly
The bandwidth of operation of antenna is adjusted, while controlling distribution of the near field magnetic field on three-dimensional.
Such as Fig. 6 a, the distance between center parallel line S1=4mm where the first arm 2a and the second arm 2b, small in the present embodiment
The distance between center parallel line S2=8mm where third arm 3a and the 4th arm 3b, it is even that the first dipole length is greater than second
The length of extremely sub length, the first arm 2a and the second arm 2b are that the length of 62mm, third arm 3a and the 4th arm 3b are 54mm.
The junction of first arm 2a and third arm 3a are provided with the first bending angle 4a, the connection of the second arm 2b and the 4th arm 3b
Place is provided with the second bending angle 4b, for the needs of actual processing, needs to reserve certain space for current feed terminal, such as Fig. 6 b
In, a length of fed=1mm, width w1The space of=3mm, d=3mm, α are 45 °, and wherein the side length of bending angle is respectively d=3mm
And w=3mm.It is symmetrical centered on second bending angle 4b and the first bending angle 4a.
Fig. 7 a is the antenna with bending angle of the present embodiment, and Fig. 7 b is right angle.
Brachium, that is, 2a, 2b, 3a and 3b is equal in the case of being kept for two kinds, while line width is also consistent, thus progressive
It can comparative analysis.
Fig. 8 be reflection coefficient comparison diagram, it can be seen from the figure that in the case of two kinds the bandwidth of -10dB it is almost the same and
It is relatively wide.Since the present embodiment is unfolded mainly around uhf band (860MHz~960MHz), the bandwidth of the present embodiment is
840MHz to 1020MHz covers the frequency range, and right angle is that the frequency range cannot be completely covered in 890MHz to 1100MHz.
In addition, it is about 920MHz that the structure that the present embodiment proposes, which corresponds to frequency point, from the point of view of the corresponding Frequency point of reflection coefficient minimum value, and
Right angle is 970MHz.Therefore, the performance for the antenna reflection coefficient with bending corner structure that the present embodiment proposes is better than straight
The antenna of angular formula can preferably be suitable for UHF near field RFID systems.
Fig. 9 a, Fig. 9 b are distribution of the magnetic-field component along y-axis, are (a) x-component | Hx | and (b) y-component | Hy |；
Fig. 9 a, Fig. 9 b and Fig. 9 are distribution situation of the magnetic-field component in reader antenna near-field region.Wherein Fig. 9 a and Fig. 9 b
It is x-component | Hx | and y-component | Hy | along the distribution of y-axis.It can be seen that the distribution trend of two kinds of forms is essentially identical, but this
Magnetic field strength of the structure that embodiment proposes in central area (within the scope of about -50mm~50mm) is bigger at least than right angle
3dB, it means that in the case where same power input, the reader antenna of right angle may produce at region in its center
Raw identification blind area.In addition, Figure 10 then gives magnetic field z-component | Hz | the diagonally distribution situation of y=x, it can be with from figure
It is evident that the structure that the present embodiment proposes can effectively enhance near field magnetic field strength.
Conclusion: in conclusion the antenna with bending corner structure that the present embodiment proposes can effectively adjust reader day
The reflection coefficient and bandwidth of line, so that it is applied to uhf band near field RFID systems；Meanwhile enhancing the close of reader antenna
Field magnetic field strength, to avoid the generation of identification blind area.
Embodiment 2:
In the present embodiment, the distance between center parallel line where the first arm 2a and the second arm 2b is greater than third arm 3a and the
The distance between center parallel line, length of first dipole length less than the second dipole where four arm 3b.Specifically, first
The distance between center parallel line where arm 2a and the second arm 2b is center parallel line where 8nm, third arm 3a and the 4th arm 3b
The distance between for the length of 4nm, the first arm 2a and the second arm 2b be that the length of 54mm, third arm 3a and the 4th arm 3b is
62mm。
It can recognize any UHF near field RFID reader antenna for putting label the present invention provides a kind of, specific implementation should
There are many method and approach of technical solution, the above is only a preferred embodiment of the present invention, it is noted that for this technology
For the those of ordinary skill in field, various improvements and modifications may be made without departing from the principle of the present invention, this
A little improvements and modifications also should be regarded as protection scope of the present invention.Existing skill can be used in each component part being not known in the present embodiment
Art is realized.
Claims (8)
1. a kind of can recognize the UHF near field RFID reader antenna for arbitrarily putting label, which is characterized in that including dielectric-slab, be situated between
Scutum is equipped with metal layer, and metal layer includes two and is mutually perpendicular to but dipole that length is different, any one in two dipoles
The two-arm equal length of a dipole, position are parallel and not conllinear.
2. a kind of recognizable UHF near field RFID reader antenna for arbitrarily putting label according to claim 1, feature
It is, including the first dipole (2) and the second dipole (3), the first dipole (2) includes the first arm (2a) and the second arm
(2b), the second dipole (3) include third arm (3a) and the 4th arm (3b)；
First dipole (2) is mutually perpendicular to the second dipole (3) but length is different；
First arm (2a) and the second arm (2b) equal length, parallel to each other and not conllinear, third arm (3a) and the 4th arm (3b) are long
Spend it is equal, it is parallel to each other and not conllinear.
3. a kind of recognizable UHF near field RFID reader antenna for arbitrarily putting label according to claim 2, feature
It is, is put down where the distance between parallel lines where the first arm (2a) and the second arm (2b) and third arm (3a) and the 4th arm (3b)
The distance between line etc..
4. a kind of recognizable UHF near field RFID reader antenna for arbitrarily putting label according to claim 2, feature
It is, the first arm (2a) connects third arm (3a), and the second arm (2b) connects the 4th arm (3b).
5. a kind of recognizable UHF near field RFID reader antenna for arbitrarily putting label according to claim 1, feature
It is, the length of any one dipole is slightly shorter than 1/2nd wavelength.
6. a kind of recognizable UHF near field RFID reader antenna for arbitrarily putting label according to claim 2, feature
It is, the distance between parallel lines are greater than third arm (3a) and the 4th arm (3b) institute where the first arm (2a) and the second arm (2b)
Distance between parallel lines, length of first dipole length less than the second dipole.
7. a kind of recognizable UHF near field RFID reader antenna for arbitrarily putting label according to claim 2, feature
It is, the distance between parallel lines are less than third arm (3a) and the 4th arm (3b) institute where the first arm (2a) and the second arm (2b)
Distance between parallel lines, the first dipole length are greater than the length of the second dipole.
8. a kind of recognizable UHF near field RFID reader antenna for arbitrarily putting label according to claim 2, feature
It is, the junction of first arm (2a) and third arm (3a) is provided with the first bending angle (4a), the second arm (2b) and the 4th
The junction of arm (3b) is provided with the second bending angle (4b).
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| CN201910536372.9A CN110247179B (en) | 2019-06-20 | 2019-06-20 | UHF near field RFID reader antenna capable of identifying randomly placed tags |
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| CN201910536372.9A CN110247179B (en) | 2019-06-20 | 2019-06-20 | UHF near field RFID reader antenna capable of identifying randomly placed tags |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111900541A (en) * | 2020-07-02 | 2020-11-06 | 江苏电子信息职业学院 | UHF near field RFID reader antenna with reconfigurable identification area |
| CN113570766A (en) * | 2021-07-27 | 2021-10-29 | 广州安的电子科技有限公司 | Non-inductive channel intelligent networking identification system |
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| CN111900541A (en) * | 2020-07-02 | 2020-11-06 | 江苏电子信息职业学院 | UHF near field RFID reader antenna with reconfigurable identification area |
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| CN110247179B (en) | 2024-05-03 |
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