WO2009096808A1 - The tag for radio-frequency identification - Google Patents
The tag for radio-frequency identification Download PDFInfo
- Publication number
- WO2009096808A1 WO2009096808A1 PCT/RU2008/000054 RU2008000054W WO2009096808A1 WO 2009096808 A1 WO2009096808 A1 WO 2009096808A1 RU 2008000054 W RU2008000054 W RU 2008000054W WO 2009096808 A1 WO2009096808 A1 WO 2009096808A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tag
- base
- identification
- conducting layer
- microchip
- Prior art date
Links
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
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
- G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
- G08B13/2414—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags
- G08B13/2417—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags having a radio frequency identification chip
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/40—Element having extended radiating surface
Definitions
- the invention refers to radio engineering and is intended for radio-frequency identification of objects (goods, products, structures) of different purpose and receiving of information about them.
- tag for radio-frequency identification consisting of identification microchip and antenna connected to it, comprising two symmetrical plate elements (US N° 6,147,606 G08B 13/14, 2000). Imperfection of this device is that if it is installed on metallic surface reading distance will be decreased.
- Imperfection of this device is overall size and necessity for additional matching circuit between microchip and antenna.
- substrate of radio- frequency dielectric is used for installation of antenna and matching circuit.
- Additional matching circuit can contain both lumped elements and be implemented as sections of microstrip lines, which sophisticate tag construction and increase its size.
- identification microchip there is also a tag for radio-frequency identification of containing identification microchip and microstrip antenna matched with it, including lower conducting layer and upper conducting layer. Outputs of identification microchip are connected directly to the upper and lower conducting layers, identification microchip has complex impedance (10 ⁇ 30) - j(410 ⁇ 430) ohms, it is matched with complex impedance of microstrip antenna within the range of 0,86 ⁇ 0,9 of its resonance frequency and tag operating range makes up 865 ⁇ 869,65 MHz (RU Ns
- the result ensuring solving the set problem solving lies in providing of reliable protection of antenna from external action (in particular, from vandalism), improving of mounting of conducting layers reliability, admitting separation of conducting layers only with air, allowing exclusion of dielectric layer, increasing of stability of tag characteristics within a wide temperature range, decreasing of its cost.
- the tag for radio-frequency identification consists of body, identification microchip and microstrip antenna matched with it, including lower conducting layer and upper conducting layer. Identification microchip outputs are connected directly to lower and upper conducting layers. Identification microchip with complex impedance (10 ⁇ 30) - j(410 ⁇ 430) ohm is matched with complex impedance of microstrip antenna within the range 0,86 ⁇ 0,9 of its resonance frequency and tag operating range makes up 865 ⁇ 869,65 MHz. At that lower and upper conducting layers have air space between them and body comprises base and hollow cover trimmed in circumferential direction. Base has columns, lower conducting layer is fixed directly to the base, and upper conducting layer is fixed to the columns.
- lower and upper conducting layers are made of copper or its alloy and installed parallel and identification microchip is installed between conducting layers, e.g. lower and upper conducting layers are implemented as copper plates 0,5 mm thick.
- lower conducting layer and upper conducting layer are fixed to the base and two cylindrical columns respectively with mounting elements, base is flat, cover is implemented as tetrahedral pyramid of trapezoidal cross-section and lower conducting layer area is larger than the area of upper conducting layer.
- Figure 1 shows tag for radio-frequency identification in section
- figure 2 - tag with body cover removed
- figure 3 3D view of tag in the body
- figure 4 - diagram of dependency of return loss on frequency
- figure 5 diagram of dependency of antenna resistance and reactance on frequency.
- the tag for radio-frequency identification consists of body, identification microchip 1 (e.g. Philips UCODE) and microstrip antenna matched with it, including lower conducting layer 2 and upper conducting layer 3.
- Identification microchip 1 outputs are connected directly to upper and lower conducting layers 2, 3.
- Identification microchip 1 has complex impedance within the range (10 ⁇ 30) - j(410 ⁇ 430) ohms and is matched with complex impedance of microstrip antenna within the range 0,86 ⁇ 0,9 of its resonance frequency.
- Tag operating range is 865 ⁇ 869,65 MHz.
- Lower and upper conducting layers 2, 3 are made of copper and installed with space between them.
- Body is implemented as the base 4 and hollow cover 5 trimmed in circumferential direction.
- the base 4 is implemented with columns 6, 7.
- the lower conducting layer 2 is fixed directly to the base 4 and upper conducting layer 3 is fixed to the columns 6, 7.
- Lower and upper conducting layers 2, 3 are installed parallel, identification microchip is installed between conducting layers.
- Lower and upper conducting layers 2, 3 are implemented as copper plates 0,5 mm thick.
- Lower conducting layer 2 and upper conducting layer 3 are fixed to the base 4 and two cylindrical columns 6, 7 respectively with mounting elements 8.
- the base 4 is made flat and the cover 5 is implemented as tetrahedral pyramid of trapezoidal cross-section.
- Lower conducting layer 2 area is larger than the area of upper conducting layer 3.
- the base 4 is implemented with openings 9 for mounting on identified object (not illustrated), located outside perimeter trimmed with the cover 5.
- Range of matching on return loss level no more than -20 dB lies within the range 846 ⁇ 886 MHz, that makes up 0,86 ⁇ 0,9 of resonance frequency if antenna resonance frequency is 982 MHz.
- Tag operating band lies within the matching range and return loss within tag operating band does not exceed -33 dB.
- the given tag is intended for frequency band 865 ⁇ 869,65 MHz, specified by European standards ETSI EN 300-220, ETSI EN 302-208.
- Figure 4 shows dependency of return loss on frequency. Thus return loss value is laid off Y-direction on a logarithmic scale.
- Figure 5 shows dependency of real and imaginary part of antenna complex impedance on frequency relative to point of connection of integrated circuit.
- values Ra as active part and Xa as reactive part of antenna complex impedance are laid off Y-direction and expressed in ohms.
- tag in body length 182 mm, width 25 mm, height 17 mm.
- the tag operates as follows.
- the concerned party e.g. product manufacturer or trade organization
- each object goods, product, structure etc.
- tag of radio-frequency identification during its production, handing over to trade organization or its selling.
- Microstrip antenna (layers 2, 3) provides receiving of signal from external readout device and reverse transfer of individual information which is contained in identification microchip within the range of 10 m if using reader with power 2 W and antenna with circular polarization and 8 dBi gain connected to it. When being outside the limit of matching range readout distance is decreased more than two times. This fact does not allow using of tag in modern identification systems.
- the cover 5 and base 4 provide reliable protection of antenna from external action (in particular, from vandalism).
- the openings 9 provide reliable mounting of tag on an object.
- the columns 6, 7 and mounting elements 8 provide reliability of fixing of conducting layers 2, 3 and allow separation of conducting layers 2, 3 only with air. This allows exclusion of dielectric layer, increasing stability of tag characteristics within a wide temperature range, decreasing its cost.
- the given invention is implemented by means of universal equipment widely spread in mechanical engineering for production of radio engineering equipment and facilities of automatic control and inspection.
Abstract
The tag for radio-frequency identification of objects consists of body, identification microchip 1 and a micro-strip antenna, comprising a lower 2 and an upper 3 conducting layers. The outputs of the microchip 1 is directly connected to the lower 2 and the upper 3 conducting layers. A complex impedance of the identification microchip 1 is in the range of from (10÷30) to j (410÷430) ohm and is matched with the complex impedance of the micro-strip antenna within the range of 0,86÷90 of its resonance frequency, therewith, an operating range of the tag frequency makes up 865÷869.65 MHz. The conducting layers are made of copper and are installed with a space between them. The body is made in the form of flat base 4 and a hollow cover 5, which is trimmed in the circumferential direction and is made with a tetrahedral pyramid of trapezoidal cross-section. The base 4 has columns 6 and 7. The conducting layers 2 and 3 are fixed correspondingly to the base 4 and to the columns 6 and 7 by means of mounting elements S and are installed parallel, but the identification microchip 1 is located between them. The layers 2 and 3 may be made in the form of copper plates with a thickness of 0.5 mm. An area of the layer 2 is larger, than an area of the layer 3. The base 4 is implemented with openings 9 in order to be mounted on an identified object. The cover and the base are destined for a dependable protection against an external influence. The columns 6 and 7 and the elements 8 provide with a dependability of fixation of the layers 2 and 3 and their air separation. It allows to exclude the presence of dielectric layer and to improve a stability of characteristics of the tag in the limits of wide temperature range upon a decrease of cost.
Description
THE TAG FOR RADIO-FREQUENCY IDENTIFICATION Field of the Invention
The invention refers to radio engineering and is intended for radio-frequency identification of objects (goods, products, structures) of different purpose and receiving of information about them.
Prior Art
There is a tag for radio-frequency identification consisting of identification microchip and antenna connected to it, comprising two symmetrical plate elements (US N° 6,147,606 G08B 13/14, 2000). Imperfection of this device is that if it is installed on metallic surface reading distance will be decreased.
There is a device for radio-frequency identification of consisting of identification microchip and microstrip antenna connected to it, containing lower conducting layer, upper conducting layer and dielectric layer located between them (US JM° 6215402 G08B 13/14, 2001).
The construction of this device provides significant increase in directivity. Such tags are particulary intended for installation on metallic surfaces.
Imperfection of this device is overall size and necessity for additional matching circuit between microchip and antenna. In this case substrate of radio- frequency dielectric is used for installation of antenna and matching circuit. Additional matching circuit can contain both lumped elements and be implemented as sections of microstrip lines, which sophisticate tag construction and increase its size.
There is also a tag for radio-frequency identification of containing identification microchip and microstrip antenna matched with it, including lower conducting layer and upper conducting layer. Outputs of identification microchip are connected directly to the upper and lower conducting layers, identification microchip has complex impedance (10÷30) - j(410÷430) ohms, it is matched with complex impedance of microstrip antenna within the range of 0,86÷0,9 of its resonance frequency and tag operating range makes up 865÷869,65 MHz (RU Ns
62723,27.04.2007, prototype).
Imperfections of this device are weak protection of antenna from external action, low reliability of mounting of conducting layers in case of foamed dielectric use, necessity for use of dielectric layer increasing tag cost in case of high-quality radio-frequency dielectric use. Summary of the invention
Engineering problem is creation of effective tag for radio-frequency identification and extension of means of radio-frequency identification.
The result ensuring solving the set problem solving lies in providing of reliable protection of antenna from external action (in particular, from vandalism), improving of mounting of conducting layers reliability, admitting separation of conducting layers only with air, allowing exclusion of dielectric layer, increasing of stability of tag characteristics within a wide temperature range, decreasing of its cost.
The tag for radio-frequency identification consists of body, identification microchip and microstrip antenna matched with it, including lower conducting layer and upper conducting layer. Identification microchip outputs are connected directly to lower and upper conducting layers. Identification microchip with complex impedance (10÷30) - j(410÷430) ohm is matched with complex impedance of microstrip antenna within the range 0,86÷0,9 of its resonance frequency and tag operating range makes up 865÷869,65 MHz. At that lower and upper conducting layers have air space between them and body comprises base and hollow cover trimmed in circumferential direction. Base has columns, lower conducting layer is fixed directly to the base, and upper conducting layer is fixed to the columns.
In particular cases lower and upper conducting layers are made of copper or its alloy and installed parallel and identification microchip is installed between conducting layers, e.g. lower and upper conducting layers are implemented as copper plates 0,5 mm thick.
It is preferable that lower conducting layer and upper conducting layer are fixed to the base and two cylindrical columns respectively with mounting elements, base is flat, cover is implemented as tetrahedral pyramid of trapezoidal cross-section and lower conducting layer area is larger than the area of upper conducting layer.
Detailed Description of the Invention
Figure 1 shows tag for radio-frequency identification in section, figure 2 - tag with body cover removed, figure 3 - 3D view of tag in the body, figure 4 - diagram of dependency of return loss on frequency, figure 5 — diagram of dependency of antenna resistance and reactance on frequency.
The tag for radio-frequency identification consists of body, identification microchip 1 (e.g. Philips UCODE) and microstrip antenna matched with it, including lower conducting layer 2 and upper conducting layer 3. Identification microchip 1 outputs are connected directly to upper and lower conducting layers 2, 3. Identification microchip 1 has complex impedance within the range (10÷30) - j(410÷430) ohms and is matched with complex impedance of microstrip antenna within the range 0,86÷0,9 of its resonance frequency. Tag operating range is 865÷869,65 MHz. Lower and upper conducting layers 2, 3 are made of copper and installed with space between them. Body is implemented as the base 4 and hollow cover 5 trimmed in circumferential direction. The base 4 is implemented with columns 6, 7. The lower conducting layer 2 is fixed directly to the base 4 and upper conducting layer 3 is fixed to the columns 6, 7.
Lower and upper conducting layers 2, 3 are installed parallel, identification microchip is installed between conducting layers. Lower and upper conducting layers 2, 3 are implemented as copper plates 0,5 mm thick.
Lower conducting layer 2 and upper conducting layer 3 are fixed to the base 4 and two cylindrical columns 6, 7 respectively with mounting elements 8.
The base 4 is made flat and the cover 5 is implemented as tetrahedral pyramid of trapezoidal cross-section.
Lower conducting layer 2 area is larger than the area of upper conducting layer 3.
The base 4 is implemented with openings 9 for mounting on identified object (not illustrated), located outside perimeter trimmed with the cover 5. Identification microchip 1 connected directly to tag antenna (layers 2, 3) has complex impedance within the range Zj0=(10÷30) - j(410÷430) ohm, consisting of
resistance Rjcand reactance Xjc. Matching and maximum effective transfer of power from antenna to identification microchip 1 are reached provided that complex impedance of identification microchip Zjc and antenna ZA are complex conjugated
Zic = Z*A (figure 5). Range of matching frequency 0,86÷0,9 of resonance frequency is determined experimentally. Matching frequency range of tag antenna with identification microchip 1 is limited by frequencies where return loss does not exceed -20 dB, this conforms to current conditions of tag use (figure 4).
Range of matching on return loss level no more than -20 dB lies within the range 846÷886 MHz, that makes up 0,86÷0,9 of resonance frequency if antenna resonance frequency is 982 MHz. Tag operating band lies within the matching range and return loss within tag operating band does not exceed -33 dB.
When identification microchip impedance is changed within the range
Zic=(10÷30) - j(410÷430), return loss within the range 0,86÷0,9 of resonance frequency will not exceed -20 dB, thus frequency band of integrated circuit matching having complex impedance within the range Zjc=(10÷30) - j(410÷430) with antenna impedance on return loss level -20 dB makes up 0,86÷0,9 of resonance frequency.
The given tag is intended for frequency band 865÷869,65 MHz, specified by European standards ETSI EN 300-220, ETSI EN 302-208.
Figure 4 shows dependency of return loss on frequency. Thus return loss value is laid off Y-direction on a logarithmic scale.
Figure 5 shows dependency of real and imaginary part of antenna complex impedance on frequency relative to point of connection of integrated circuit. Thus values Ra as active part and Xa as reactive part of antenna complex impedance are laid off Y-direction and expressed in ohms.
Dimension of tag in body: length 182 mm, width 25 mm, height 17 mm. The tag operates as follows.
For identification of objects with metallic surfaces the concerned party, e.g. product manufacturer or trade organization, provides each object (goods, product,
structure etc.) with tag of radio-frequency identification during its production, handing over to trade organization or its selling.
Microstrip antenna (layers 2, 3) provides receiving of signal from external readout device and reverse transfer of individual information which is contained in identification microchip within the range of 10 m if using reader with power 2 W and antenna with circular polarization and 8 dBi gain connected to it. When being outside the limit of matching range readout distance is decreased more than two times. This fact does not allow using of tag in modern identification systems.
If real and imaginary part of identification microchip complex impedance is changed within the specified range, return loss will not exceed -20 dB. In view of matching deterioration, when being outside the specified interval return loss exceeds -20 dB. This fact also does not allow using of tag in modern identification systems.
The cover 5 and base 4 provide reliable protection of antenna from external action (in particular, from vandalism). The openings 9 provide reliable mounting of tag on an object. The columns 6, 7 and mounting elements 8 provide reliability of fixing of conducting layers 2, 3 and allow separation of conducting layers 2, 3 only with air. This allows exclusion of dielectric layer, increasing stability of tag characteristics within a wide temperature range, decreasing its cost.
Industrial Applications The given invention is implemented by means of universal equipment widely spread in mechanical engineering for production of radio engineering equipment and facilities of automatic control and inspection.
Claims
1. The tag for radio-frequency identification consists of body, identification microchip and microstrip antenna matched with it, including lower conducting layer and upper conducting layer. Identification microchip outputs are connected directly to lower and upper conducting layers. Identification microchip with complex impedance (10÷30) - j(410÷430) ohm is matched with complex impedance of microstrip antenna within the range 0,86÷0,9 of its resonance frequency and tag operating range is 865÷869,65 MHz. At that lower and upper conducting layers have air space between them and body comprises base and hollow cover trimmed in circumferential direction. Base has columns, lower conducting layer is fixed directly to the base, and upper conducting layer is fixed to the columns.
2. Tag according to Claim 1, characterized in that subjects, that lower and upper conducting layers are made of copper or its alloy and installed parallel, and identification microchip is installed between conducting layers.
3. Tag according to Claim 1,2, characterized in that subjects, that lower and upper conducting layers are implemented as copper plates 0,5 mm.
4. Tag according to Claim 1,2 characterized in that subjects, that lower conducting layer and upper conducting layer are fixed to the base and two cylindrical columns respectively by means of mounting elements.
5. Tag according to Claim 1,2 characterized in that subjects, that the base is made flat and the cover is implemented as tetrahedral pyramid of trapezoidal cross- section.
6. Tag according to Claim 1,2 characterized in that subjects, that lower conducting layer area is larger than the area of upper conducting layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/RU2008/000054 WO2009096808A1 (en) | 2008-01-31 | 2008-01-31 | The tag for radio-frequency identification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/RU2008/000054 WO2009096808A1 (en) | 2008-01-31 | 2008-01-31 | The tag for radio-frequency identification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009096808A1 true WO2009096808A1 (en) | 2009-08-06 |
Family
ID=40913006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/RU2008/000054 WO2009096808A1 (en) | 2008-01-31 | 2008-01-31 | The tag for radio-frequency identification |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2009096808A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6215402B1 (en) * | 1998-03-13 | 2001-04-10 | Intermec Ip Corp. | Radio frequency identification transponder employing patch antenna |
| RU2001101456A (en) * | 1998-06-09 | 2003-01-10 | Моторола Инк. | HIGH FREQUENCY IDENTIFICATION TAG WITH ANTENNA COMPONENTING THE UNIFIED WHOLE WITH THE PRODUCT |
| RU62723U1 (en) * | 2006-10-18 | 2007-04-27 | Общество с ограниченной ответственностью "Аэро Солюшенз СПБ" | LABEL FOR RADIO FREQUENCY IDENTIFICATION OF OBJECTS |
-
2008
- 2008-01-31 WO PCT/RU2008/000054 patent/WO2009096808A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6215402B1 (en) * | 1998-03-13 | 2001-04-10 | Intermec Ip Corp. | Radio frequency identification transponder employing patch antenna |
| RU2001101456A (en) * | 1998-06-09 | 2003-01-10 | Моторола Инк. | HIGH FREQUENCY IDENTIFICATION TAG WITH ANTENNA COMPONENTING THE UNIFIED WHOLE WITH THE PRODUCT |
| RU62723U1 (en) * | 2006-10-18 | 2007-04-27 | Общество с ограниченной ответственностью "Аэро Солюшенз СПБ" | LABEL FOR RADIO FREQUENCY IDENTIFICATION OF OBJECTS |
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