CN103401066B - A kind of UHF anti-metal tag antenna - Google Patents
A kind of UHF anti-metal tag antenna Download PDFInfo
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- CN103401066B CN103401066B CN201310339321.XA CN201310339321A CN103401066B CN 103401066 B CN103401066 B CN 103401066B CN 201310339321 A CN201310339321 A CN 201310339321A CN 103401066 B CN103401066 B CN 103401066B
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Abstract
The invention discloses a kind of UHF anti-metal tag antenna, belong to electronic technology field.Comprise rectangle bearing substrate (1) and amount to a period of time antenna (2), described rectangle bearing substrate (1) is buffer medium layer (1-1): thickness 0.3mm ~ 1mm and magnetic material layer (1-2): the double-decker that thickness 1mm ~ 3mm forms; Buffer medium layer (1-1) is positioned at magnetic material layer (1-2) center; Described a period of time antenna (2) of amounting to is positioned at buffer medium layer (1-1) center, amount to the beeline W1 of the broadside of a period of time antenna (2) and the broadside of homonymy magnetic material layer (1-2), meet with the beeline W2 on the long limit on the long limit and homonymy magnetic material layer (1-2) of amounting to a period of time antenna (2): 1mm≤W1≤20mm, 1mm≤W2≤10mm.The present invention adopts lower-cost magnetic material layer and buffer medium layer as the rectangle bearing substrate of antenna, effectively reduces thickness and the cost of manufacture of UHF anti-metal tag antenna, makes that it is in enormous quantities, standardized production becomes possibility.
Description
Technical field
The invention belongs to electronic technology field, relate to RF application, particularly relate to a kind of UHF anti-metal tag antenna.
Background technology
UHF(ultrahighfrequency, hyperfrequency) abbreviation, UHF anti-metal tag refers to UHF radio frequency identification anti-metal tag.UHF label antenna is applied widely due to its reading far away distance, but needs to identify metal object many times, such as automobile, steel cylinder, container, weaponry etc.; In addition, at RFID(RadioFrequencyIdentification, radio-frequency (RF) identification) in systematic difference process, metal environment exists everywhere.When common UHF label is placed on metal surface, its radiation resistance sharply reduce and with chip mismatch, thus cause it to read distance shortening rapidly, even can not be read, cause current UHFRFID system can not apply on a large scale in every profession and trade.Therefore design aly can become a focus of industry research by the UHF anti-metal tag of works fine under metal environment.The main stream approach of the reading situation of the current UHF of improvement label under metal environment is the relative distance increasing antenna and metal surface.Along with the increase of the spacing of metallic plate and label, metal environment is more and more less on its impact, especially at distance antenna operating wavelength four/for the moment, the ripple that reflected wave and the label antenna of metallic plate are launched superposes mutually, improve the gain of former label further, make it read distance than farther under nonmetal environment.In vacuum, the quarter-wave of the working frequency range of UHF label antenna is about 8cm, and in production application, heavy abundant label occupies the aesthetic standards that very large space does not meet user, and electronic tag is thicker, corresponding cost also can improve, and is unfavorable for large-scale industry production application.In order to reduce the thickness of UHF anti-metal tag antenna, the material that industry adopts potsherd or PVC material etc. to have certain dielectric usually as the substrate of label antenna to shorten the space length between label and metallic plate.And magnetic material layer also has certain magnetic property while having dielectric property relative to potsherd or PVC, can space length between more effective shortening label and metallic plate, and its dielectric be close and magnetic permeability parameter can well reach impedance matching, thus obtain thinner anti-metal tag antenna.Add the buffer dielectric layer with lower dielectric parameter, with air dielectric relatively thus the impact that can reduce antenna impedance, and the dielectric parameter of magnetic material and the relatively large space length that can effectively shorten of magnetic parameter, therefore be combined as on the basis of anti-metal tag substrate at magnetic material layer and buffer medium layer, and then the structure of design anti-metal tag antenna, make it mate with chip, and there is higher gain, thus under metal environment, obtain good reading distance.But the substrate of magnetic material as anti-metal tag antenna is seldom used in current research and development handbook literature and similar anti-metal tag antenna patent, more corresponding explanation is not done to the parameter characteristic of magnetic material, thickness, physical dimension.
Summary of the invention
Goal of the invention of the present invention is: for above-mentioned Problems existing, a kind of UHF anti-metal tag antenna is provided, apply in the substrate of this antenna that cost is lower, the magnetic material layer of thinner thickness and buffer medium layer, can be operated in the environment of metal surface.
Technical scheme of the present invention is as follows:
A kind of UHF anti-metal tag antenna, comprises rectangle bearing substrate 1, amounts to a period of time antenna 2, described in amount to a period of time antenna 2 and be fixed on rectangle bearing substrate 1 surface; Described rectangle bearing substrate 1 is buffer medium layer 1-1: thickness 0.3mm ~ 1mm and magnetic material layer 1-2: the double-decker that thickness 1mm ~ 3mm forms; The size of magnetic material layer 1-2 is not less than the size of buffer medium layer 1-1, and the size of buffer medium layer 1-1 is greater than the size of folded dipole antenna 2, and buffer medium layer 1-1 is fixed on magnetic material layer 1-2 center; Described a period of time antenna 2 of amounting to is fixed on buffer medium layer 1-1 center, amount to the beeline W1 of the broadside of a period of time antenna 2 and the broadside of homonymy magnetic material layer 1-2, meet 1mm≤W1≤20mm, 1mm≤W2≤10mm with the beeline W2 on the long limit on the long limit and homonymy magnetic material layer 1-2 of amounting to a period of time antenna 2.Described rectangle bearing substrate 1 electromagnetic parameter requires as follows:
Magnetic material layer: buffer medium layer:
Magnetic permeability real part: 2≤μ '≤50; Real part of permittivity: 2≤ε '≤5;
Magnetic permeability imaginary part: 0< μ "≤5; Dielectric loss tangent: 0<tg ε=ε "/ε ' <0.05;
Real part of permittivity: 5≤ε '≤50;
Imaginary part of dielectric constant: 0< ε "≤5.
It should be noted that, UHF anti-metal tag antenna provided by the invention, the impedance influences of magnetic material layer 1-2 to folded dipole antenna 2 that its electromagnetic parameter used is higher is larger, and dielectric buffer layer 1-1 dielectric parameter is less, play certain cushioning effect, the impedance of folded dipole antenna 2 can be prevented by the impact of metal environment and rectangle bearing substrate 1 with frequency great change, its bandwidth can also be increased, increase the electric size of rectangle bearing substrate 1 simultaneously, improve the match condition of antenna chip and total, improve Energy Transfer coefficient.Because the maximum read distance formula of antenna is
wherein λ is the wavelength of working frequency points in free space, P
t, G
tfor reading antenna power and gain, G
rfor label antenna gain, τ is power transmission factor, p
thfor label antenna chip valve voltage, under the condition of other parameter constants, add buffer medium layer and can improve τ, and then increase reading distance.
UHF anti-metal tag antenna provided by the invention, wherein amount to a period of time antenna 2 and comprise metal antenna structure for transmission information and the read-write integrated circuit (IC) chip being identified object information, wherein metal antenna structure is not unique, the entirety designing whole antenna and substrate formation after selected chip is mated with chip, maximum to guarantee energy through-put power.Metal antenna structure adopts silver to starch printing, the mode of printed circuit is produced on surface film/paper being pasted on again dielectric buffer layer 1-1, or employing silver slurry prints, the mode of printed circuit makes the surface being directly bonded in dielectric buffer layer 1-1.
UHF anti-metal tag antenna provided by the invention, wherein rectangle bearing substrate 1 buffer medium layer 1-1 with amount to a period of time antenna 2 and be connected, magnetic material layer 1-2 is placed in bottom and in use connects with detected metal surface article.
Should illustrate, UHF anti-metal tag antenna provided by the invention, due to the shortening effect of dipole antenna, rectangle bearing substrate 1 physical size should be greater than amounts to a period of time antenna 2 physical size.
UHF anti-metal tag antenna working frequency range provided by the invention is 800MHz ~ 1GHz.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
The present invention is under the prerequisite meeting UHFRFID communicating requirement, adopt the rectangle bearing substrate of buffer medium layer double-decker as antenna of lower-cost magnetic material layer, low dielectric, substrate gross thickness is 1.5mm ~ 4mm, label antenna is enable to be operated in metal surface, under reading antenna 30dBm transmitting power, 6dBi gain, antenna stable reading distance in metal environment is 2.5m ~ 6m, thus effectively reduce thickness and the cost of manufacture of UHF anti-metal tag antenna, make that it is in enormous quantities, standardized production becomes possibility.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the structural representation of UHF anti-metal tag antenna;
Fig. 2 is the vertical view schematic diagram of UHF anti-metal tag antenna embodiment;
Fig. 3 is the end view schematic diagram of UHF anti-metal tag antenna embodiment;
Reference numeral: rectangle bearing substrate-1, amount to a period of time antenna-2, buffer medium layer-1-1, magnetic material layer-1-2, the broadside of magnetic material layer 1-2 and homonymy and amount to the long limit beeline-W2 that the broadside beeline-W1 of a period of time antenna 2, the long limit of magnetic material layer 1-2 and homonymy amount to a period of time antenna 2.
Embodiment
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this specification (comprising any accessory claim, summary and accompanying drawing), unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.Namely unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
Embodiment
A UHF anti-metal tag antenna for actual fabrication, vertical view as shown in Figure 2, comprises rectangle bearing substrate 1, amounts to a period of time antenna 2; Rectangle bearing substrate 1 is the double-decker that magnetic material layer 1-2 that buffer medium layer 1-1 and 1.8mm that 0.8mm is thick is thick forms, buffer medium layer 1-1 with amount to a period of time antenna 2 and be connected, magnetic material layer 1-2 connects with object to be detected metal covering; Amount to a period of time antenna 2 and comprise the integrated circuit (IC) chip of read-write information and the metal antenna structure of transmission information.Buffer medium layer parameter: ε '=2.3, ε "=0.05; Magnetic material layer parameter: μ '=3.9, μ "=0.57, ε '=10.4, ε "=0.06.Selected integrated circuit (IC) chip of amounting to a period of time antenna 2, metal antenna structure parameter and magnetic material layer thickness in a period of time antenna 2 are amounted in design to be made it reach with chip to mate.The broadside of magnetic material layer 1-2 and homonymy amount to the long limit beeline W2=5mm that the broadside beeline W1=5mm of a period of time antenna 2, the long limit of magnetic material layer 1-2 and homonymy amount to a period of time antenna 2.Whole anti-metal tag antenna is of a size of long 120mm, wide 16mm, thick 2.6mm.Be applied in domestic uhf band and reading under antenna 30dBm transmitting power, 6dBi gain condition, the stable the shortest reading distance in metal environment is 2.5m.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (2)
1. a UHF anti-metal tag antenna, comprise rectangle bearing substrate (1) and folded dipole antenna (2), described folded dipole antenna (2) is fixed on rectangle bearing substrate (1) surface, it is characterized in that: described rectangle bearing substrate (1) is buffer medium layer (1-1): thickness 0.3mm ~ 1mm and magnetic material layer (1-2): the double-decker that thickness 1mm ~ 3mm forms; The size of magnetic material layer (1-2) is not less than the size of buffer medium layer (1-1), the size of buffer medium layer (1-1) is greater than the size of folded dipole antenna (2), and buffer medium layer (1-1) is fixed on magnetic material layer (1-2) center; Described folded dipole antenna (2) is fixed on buffer medium layer (1-1) center, the beeline W1 of the broadside of folded dipole antenna (2) and the broadside of homonymy magnetic material layer (1-2), meets with the beeline W2 on the long limit of folded dipole antenna (2) and the long limit of homonymy magnetic material layer (1-2): 1mm≤W1≤20mm, 1mm≤W2≤10mm;
Described rectangle bearing substrate (1) electromagnetic parameter requires as follows:
Magnetic material layer: buffer medium layer:
Magnetic permeability real part: 2≤μ '≤50; Real part of permittivity: 2≤ε '≤5;
Magnetic permeability imaginary part: 0< μ "≤5; Dielectric loss tangent: 0<tg ε=ε "/ε ' <0.05;
Real part of permittivity: 5≤ε '≤50;
Imaginary part of dielectric constant: 0< ε "≤5.
2. UHF anti-metal tag antenna as claimed in claim 1, it is characterized in that: the metal antenna structure of described folded dipole antenna (2) adopts the mode of the printing of silver slurry or printed circuit to be directly made in the surface of buffer medium layer (1-1), or is produced on surface film/paper being bonded in again buffer medium layer (1-1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310339321.XA CN103401066B (en) | 2013-08-06 | 2013-08-06 | A kind of UHF anti-metal tag antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310339321.XA CN103401066B (en) | 2013-08-06 | 2013-08-06 | A kind of UHF anti-metal tag antenna |
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| CN103401066A CN103401066A (en) | 2013-11-20 |
| CN103401066B true CN103401066B (en) | 2016-03-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102017123273A1 (en) * | 2017-10-06 | 2019-04-11 | Balluff Gmbh | UHF data carrier and method for its production |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101176109A (en) * | 2005-05-13 | 2008-05-07 | 3M创新有限公司 | Radio frequency identification tags for use on metal or other conductive objects |
| CN101390111A (en) * | 2006-02-22 | 2009-03-18 | 东洋制罐株式会社 | Base material for rfid tag adapted to metallic material |
| CN102263327A (en) * | 2011-08-04 | 2011-11-30 | 瑞声声学科技(深圳)有限公司 | Manufacturing method of radio frequency identification antenna |
| CN102437414A (en) * | 2011-08-04 | 2012-05-02 | 瑞声声学科技(深圳)有限公司 | Making method of radio frequency identification antenna |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1815558B1 (en) * | 2004-09-29 | 2014-08-20 | Panasonic Corporation | Magnetic sheet, antenna apparatus using the same, and method of producing magnetic sheet |
| US8665069B2 (en) * | 2007-10-19 | 2014-03-04 | Petratec International Ltd. | RFID tag especially for use near conductive objects |
| KR101135524B1 (en) * | 2009-05-26 | 2012-04-09 | 전자부품연구원 | An electromagnetic absorber sheet, an rfid antenna and tag with the absorber and a method for fabricating the same |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101176109A (en) * | 2005-05-13 | 2008-05-07 | 3M创新有限公司 | Radio frequency identification tags for use on metal or other conductive objects |
| CN101390111A (en) * | 2006-02-22 | 2009-03-18 | 东洋制罐株式会社 | Base material for rfid tag adapted to metallic material |
| CN102263327A (en) * | 2011-08-04 | 2011-11-30 | 瑞声声学科技(深圳)有限公司 | Manufacturing method of radio frequency identification antenna |
| CN102437414A (en) * | 2011-08-04 | 2012-05-02 | 瑞声声学科技(深圳)有限公司 | Making method of radio frequency identification antenna |
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