[go: up one dir, main page]

WO2004099821A1 - A method and apparatus for enhancing performance of an rfid tag for a compact disc - Google Patents

A method and apparatus for enhancing performance of an rfid tag for a compact disc Download PDF

Info

Publication number
WO2004099821A1
WO2004099821A1 PCT/SG2004/000117 SG2004000117W WO2004099821A1 WO 2004099821 A1 WO2004099821 A1 WO 2004099821A1 SG 2004000117 W SG2004000117 W SG 2004000117W WO 2004099821 A1 WO2004099821 A1 WO 2004099821A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrically conductive
conductive coil
rfid tag
compact disk
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SG2004/000117
Other languages
French (fr)
Inventor
Kai En Wong
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kenetics Innovations Pte Ltd
Original Assignee
Kenetics Innovations Pte Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kenetics Innovations Pte Ltd filed Critical Kenetics Innovations Pte Ltd
Publication of WO2004099821A1 publication Critical patent/WO2004099821A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0014—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form
    • G11B23/0021—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form discs
    • G11B23/0028—Details
    • G11B23/0035—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving
    • G11B23/0042—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving with provision for auxiliary features
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06K19/04—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the shape
    • G06K19/041—Constructional details
    • G06K19/042—Constructional details the record carrier having a form factor of a credit card and including a small sized disc, e.g. a CD or DVD
    • G06K19/045—Constructional details the record carrier having a form factor of a credit card and including a small sized disc, e.g. a CD or DVD the record carrier being of the non-contact type, e.g. RFID, and being specially adapted for attachment to a disc, e.g. a CD or DVD
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06K19/07—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 integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06K19/07—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 integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07758—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag
    • 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
    • G06K7/10158—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 methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field
    • G06K7/10178—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 methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field including auxiliary means for focusing, repeating or boosting the electromagnetic interrogation field
    • 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
    • G06K7/10316—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 using at least one antenna particularly designed for interrogating the wireless record carriers
    • G06K7/10336—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 using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the near field type, inductive coil
    • 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

Definitions

  • FIG. 1 depicts a typical RFID system setup whereby a RFID reader/writer is connected to one or multiple antennas. These antennas radiate the electrical RF energy from the reader/writer as electro-magnetic RF energy. RFID tags passing through the electro-magnetic field will derive power from the field and power up. If sufficient power is received, the tags are then ready for operation.
  • Figure 2 depicts a typical RFID tag which basically consists of a RFID chip connected to an antenna coil.
  • the resonance frequency of such a RFID tag will be 13.56Mhz +/- 500Khz for optimum performance.
  • Figure 3 shows the interaction of the RF field lines with a RFID tag on a non- ferrous object. As the object being tagged is non-ferrous, the electro-magnetic field lines are not impeded and therefore the RFID tag can function normally.
  • FIG. 4 depicts a RFID tag attached to a typical CD / DVD.
  • CDs / DVDs contain a layer of metallization forming the reflective surface
  • attempts to attach a RFID tag to such media have given dismal performance. This is due to the detuning of the tag due to the tag's close proximity to the metallic layer and the attenuation of the field by the metallic layer.
  • the metallic layer also lowers the 'Q' factor of the coil of the RFID tag, causing loss of range.
  • RFID tags have been made to fit the inner ring of such CDs/DNDs (hereinafter, the term compact disks will be used to describe such CDs and DVDs as well as other formats of similar optical disks with such metallization surfaces on the optical disk). Although this avoided the detuning of the tag, its small size limited its performance.
  • Figure 5 shows the effect of a RFID tagged compact disk in the RF electromagnetic field.
  • the eddy currents in the metallic layer reflect most of the energy and only a small percentage of the field lines go though the tag. As the metallic layer is thin, some field lines will go though the metallic layer but these will be greatly attenuated.
  • the present invention seeks to provide a method and apparatus for enhancing performance of an RFID Tag for a compact disk.
  • the present invention provides, an apparatus for enhancing the performance of an RFID tag for a compact disk having an inner perimeter and an outer perimeter, the apparatus comprising: a first electrically conductive coil attached to the outer perimeter of the compact disk; a second electrically conductive coil attached to the inner perimeter of the compact disk; and an electrical interconnect electrically connecting the first electrically conductive coil to the second electrically conductive coil; wherein the RFID tag is further attached onto the compact disk and in close proximity to the second electrically conductive coil.
  • a method for enhancing the performance of an RFID tag for a compact disk having an inner perimeter and an outer perimeter comprising the steps: attaching a first electrically conductive coil to the compact disk; attaching a second electrically conductive coil to the compact disk; electrically connecting the first electrically conductive coil to the second electrically conductive coil; and attaching the RFID tag to the compact disk; wherein the RFID tag is in close proximity but not in direct contact with the second electrically conductive coil.
  • a method for enhancing the range of an RFID tag having a coiled antenna when operating with an RFID tag reader/writer steps comprising: electrically connecting a first electrically conductive coil to a second electrically conductive coil using a interconnect; positioning the coiled antenna of the RFID tag in proximity with the second electrically conductive coil; and positioning the first electrically conductive coil within range of the RFID tag reader/writer.
  • Figure 6. shows the present invention of an apparatus for enhancing the performance of an RFID tag for a compact disc 12.
  • a first electrically conductive coil or an outer coil 20 of nominally two to three turns is closely wound and attached to an outer perimeter 14 of the compact disk 12.
  • a second electrically conductive coil or an inner coil 22 of nominally five to six turns is loosely wound and attached to the non-metallic inner ring 16 or inner perimeter of the compact disk 12.
  • the inner coil 22 is then electrically connected to the outer coil 20 via an interconnect 24.
  • the polarity of the inner coil 22 is in phase with the polarity of the outer coil 20. Parasitic capacitance of both the inner coil 22 and the outer coil 20 can cause the both the coils to self resonate.
  • the coils should have a self resonant frequency of typically 15Mhz. This optimum frequency can vary depending on the coupling factor between the inner coil and the RFID tag.
  • FIG. 7 shows the electrical equivalent of the invention.
  • the outer coil 20 which is larger in diameter is the main energy pick-up coil. This will induce a RF voltage in the outer coil 20.
  • This voltage is also connected to the inner coil 22 which is smaller in diameter. With the same voltage across the inner coil 22, but with a smaller diameter, the inner coil 22 will thus generate a denser electro-magnetic field around it.
  • the RFID tag being in close proximity to the inner coil 22, will receive higher electromagnetic field strength.
  • the overall effect is the RFID tag 'acquiring' a larger diameter.
  • the outer coil 20 and the inner coil 22 will resonate at a certain frequency due parasitic capacitance of both coils. This frequency has to be higher than the RFID tags' operating frequency as the RFID tag is in close proximity to the inner coil, the combined resonance will be lowered.
  • FIG 8. shows the RFID tag 30 together with the apparatus in accordance with the present invention.
  • the outer coil 20 and the inner coil 22 are wound such that when the compact disk 12 is spun at high revolutions, the entire assembly of the compact disk 12 and the apparatus of the present invention are balanced and does not cause the compact disk 12 to wobble. If the attachment of the RFID tag 30 onto the compact disk 30 causes the compact disk 30 to be unbalanced and to wobble, the positions of the apparatus of the present invention can be adjusted to compensate for the unbalanced RFID tag 30. This balances out the compact disk 30, much like adding weights to vehicle tyres.
  • Using a small RFID tag on the inner ring of a compact disk 12 will have limited range. However, a large RFID tag on the metallic layer will result in low 'Q' and may be detuned by the metallic layer, therefore will also have a limited range.
  • This present invention 'extends' the range of a small RFID tag 30 on the inner ring of the compact disk 12 to that of a larger RFID tag.
  • the present invention also prevents the loss of 'Q' associated with larger tags as the RFID tag is only loosely coupled to the inner coil. Therefore, even if the inner and outer coil is of low 'Q', the effect on the overall 'Q' factor of the RFID tag is negligible.
  • the present invention can extend the range of RF or RFID tags on compact disks or other objects with metallic coatings.
  • a 3cm diameter RFID tag is tested on a typical RFID system operating on 13.56Mhz.
  • the tag alone had an operating range of 35cm from the reader antenna. After this tag is attached to a compact disk, the range dropped to 30cm. The same tag was then attached to a CD with the apparatus of the present invention, the range was extended to 80cm.
  • the apparatus of the invention is a fully passive device ( does not need a power supply ) and is extremely reliable, it can be adhered or attached to the metallic side of the compact disk.
  • the RFID tag 30 can then be adhered to the apparatus of the present invention. In event the RFID tag 30 fails, the RFID tag 30 can be removed and replaced. If a larger RFID tag is used and it fails, the removal of the large RFID tag may damage the metallic layer of the compact disk, permanently destroying the compact disk. Therefore, this invention allows small RFID tags to perform like larger tags without the problems introduced by larger tags.
  • This invention also allows the routing and harvesting of electro-magnetic energy and re-emitting it on a focused area, much like a magnifying glass with sunlight.
  • This has been shown here as a RFID Tag on a compact disk.
  • the outer coil 20 collects the energy and the inner coil 22 re-emits it on a smaller area, focusing and increasing the energy density. Therefore, this invention further allows a coil antenna of an RFID tag not to be within the direct range of a RFID tag reader/writer. Applying this to other types of products not limited to compact disks, an outer coil 20 having a large diameter can be electrically connected to a inner coil 22 via an interconnect 24.
  • the interconnect 24 may be of a predetermined length which results in the inner coil 22 being out of range from a RFID tag reader/writer.
  • An RFID tag is then mounted or attached in a position whereby the RFID tag is in close proximity to the inner coil 22.
  • the outer coil 20 is then positioned or placed in range of the RFID tag reader/writer thus allowing the RFID tag to be operable with the RFID tag reader/writer even if the RFID tag is not within range of the RFID tag reader/writer.
  • the present invention extends the operating range of RF / RFID tags by 'virtually' enlarging the size of the tags' coil without physical connection to the tags' coil.
  • the thin and light physical characteristic of the invention, as well as it is balanced, does not impede the operation of the compact disk. It also provides an avenue to offset any imbalance caused by the RFID tag.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Artificial Intelligence (AREA)
  • General Health & Medical Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

An apparatus for enhancing the performance of an RFID tag for a compact disk (12) having an inner perimeter and an outer perimeter, the apparatus comprising: a first electrically conductive coil (20) attached to the outer perimeter (14) of the compact disk; a second electrically conductive coil (22) attached to the inner perimeter (16) of the compact disk; and an electrical interconnect (24) electrically connecting the first electrically conductive coil (20) to the second electrically conductive coil (22); wherein the RFID tag is further attached onto the compact disk (12) in close proximity to the second electrically conductive coil (22).

Description

A METHOD AND APPARATUS FOR ENHANCING PERFORMANCE OF AN RFID
TAG FOR A COMPACT DISC
BACKGROUND
[001] Figure 1. depicts a typical RFID system setup whereby a RFID reader/writer is connected to one or multiple antennas. These antennas radiate the electrical RF energy from the reader/writer as electro-magnetic RF energy. RFID tags passing through the electro-magnetic field will derive power from the field and power up. If sufficient power is received, the tags are then ready for operation.
[002] Figure 2. depicts a typical RFID tag which basically consists of a RFID chip connected to an antenna coil. In a typical RFID system operating at a nominal frequency of 13.56Mhz, the resonance frequency of such a RFID tag will be 13.56Mhz +/- 500Khz for optimum performance.
[003] Figure 3. shows the interaction of the RF field lines with a RFID tag on a non- ferrous object. As the object being tagged is non-ferrous, the electro-magnetic field lines are not impeded and therefore the RFID tag can function normally.
[004] Figure 4. depicts a RFID tag attached to a typical CD / DVD. As CDs / DVDs contain a layer of metallization forming the reflective surface, attempts to attach a RFID tag to such media have given dismal performance. This is due to the detuning of the tag due to the tag's close proximity to the metallic layer and the attenuation of the field by the metallic layer. The metallic layer also lowers the 'Q' factor of the coil of the RFID tag, causing loss of range. In attempts to avoid the metallic layer, RFID tags have been made to fit the inner ring of such CDs/DNDs (hereinafter, the term compact disks will be used to describe such CDs and DVDs as well as other formats of similar optical disks with such metallization surfaces on the optical disk). Although this avoided the detuning of the tag, its small size limited its performance.
[005] Figure 5. shows the effect of a RFID tagged compact disk in the RF electromagnetic field. The eddy currents in the metallic layer reflect most of the energy and only a small percentage of the field lines go though the tag. As the metallic layer is thin, some field lines will go though the metallic layer but these will be greatly attenuated.
[006] The performance of RFID tags on compact disk have posed a major problem for many RFID systems. In typical RFID systems operating on 13.56Mhz, for a RFID tag of 3cm diameter, read / write range can drop by up to 30% after being attached to a compact disk.
SUMMARY OF THE INVENTION
[007] The present invention seeks to provide a method and apparatus for enhancing performance of an RFID Tag for a compact disk.
[008] Accordingly, in one aspect, the present invention provides, an apparatus for enhancing the performance of an RFID tag for a compact disk having an inner perimeter and an outer perimeter, the apparatus comprising: a first electrically conductive coil attached to the outer perimeter of the compact disk; a second electrically conductive coil attached to the inner perimeter of the compact disk; and an electrical interconnect electrically connecting the first electrically conductive coil to the second electrically conductive coil; wherein the RFID tag is further attached onto the compact disk and in close proximity to the second electrically conductive coil.
[009] In another aspect of the invention, a method for enhancing the performance of an RFID tag for a compact disk having an inner perimeter and an outer perimeter, comprising the steps: attaching a first electrically conductive coil to the compact disk; attaching a second electrically conductive coil to the compact disk; electrically connecting the first electrically conductive coil to the second electrically conductive coil; and attaching the RFID tag to the compact disk; wherein the RFID tag is in close proximity but not in direct contact with the second electrically conductive coil.
[0010] In yet a further aspect of the present invention, A method for enhancing the range of an RFID tag having a coiled antenna when operating with an RFID tag reader/writer, steps comprising: electrically connecting a first electrically conductive coil to a second electrically conductive coil using a interconnect; positioning the coiled antenna of the RFID tag in proximity with the second electrically conductive coil; and positioning the first electrically conductive coil within range of the RFID tag reader/writer.
DESCRIPTION OF THE INVENTION
[0011] Figure 6. shows the present invention of an apparatus for enhancing the performance of an RFID tag for a compact disc 12. A first electrically conductive coil or an outer coil 20 of nominally two to three turns is closely wound and attached to an outer perimeter 14 of the compact disk 12. A second electrically conductive coil or an inner coil 22 of nominally five to six turns is loosely wound and attached to the non-metallic inner ring 16 or inner perimeter of the compact disk 12. The inner coil 22 is then electrically connected to the outer coil 20 via an interconnect 24. The polarity of the inner coil 22 is in phase with the polarity of the outer coil 20. Parasitic capacitance of both the inner coil 22 and the outer coil 20 can cause the both the coils to self resonate. For optimum performance in nominally 13.56Mhz RFID systems, the coils should have a self resonant frequency of typically 15Mhz. This optimum frequency can vary depending on the coupling factor between the inner coil and the RFID tag.
[0012] Figure 7. shows the electrical equivalent of the invention. As coils with larger diameters pick up more energy when subjected to an electro-magnetic field, the outer coil 20 which is larger in diameter is the main energy pick-up coil. This will induce a RF voltage in the outer coil 20. This voltage is also connected to the inner coil 22 which is smaller in diameter. With the same voltage across the inner coil 22, but with a smaller diameter, the inner coil 22 will thus generate a denser electro-magnetic field around it. The RFID tag, being in close proximity to the inner coil 22, will receive higher electromagnetic field strength. The overall effect is the RFID tag 'acquiring' a larger diameter. The outer coil 20 and the inner coil 22 will resonate at a certain frequency due parasitic capacitance of both coils. This frequency has to be higher than the RFID tags' operating frequency as the RFID tag is in close proximity to the inner coil, the combined resonance will be lowered.
[0013] Figure 8. shows the RFID tag 30 together with the apparatus in accordance with the present invention. The outer coil 20 and the inner coil 22 are wound such that when the compact disk 12 is spun at high revolutions, the entire assembly of the compact disk 12 and the apparatus of the present invention are balanced and does not cause the compact disk 12 to wobble. If the attachment of the RFID tag 30 onto the compact disk 30 causes the compact disk 30 to be unbalanced and to wobble, the positions of the apparatus of the present invention can be adjusted to compensate for the unbalanced RFID tag 30. This balances out the compact disk 30, much like adding weights to vehicle tyres.
[0014] Using a small RFID tag on the inner ring of a compact disk 12 will have limited range. However, a large RFID tag on the metallic layer will result in low 'Q' and may be detuned by the metallic layer, therefore will also have a limited range. This present invention 'extends' the range of a small RFID tag 30 on the inner ring of the compact disk 12 to that of a larger RFID tag. The present invention also prevents the loss of 'Q' associated with larger tags as the RFID tag is only loosely coupled to the inner coil. Therefore, even if the inner and outer coil is of low 'Q', the effect on the overall 'Q' factor of the RFID tag is negligible.
[0015] The present invention can extend the range of RF or RFID tags on compact disks or other objects with metallic coatings. Referring to FIGURE 9, a 3cm diameter RFID tag is tested on a typical RFID system operating on 13.56Mhz. The tag alone had an operating range of 35cm from the reader antenna. After this tag is attached to a compact disk, the range dropped to 30cm. The same tag was then attached to a CD with the apparatus of the present invention, the range was extended to 80cm.
[0016] As the apparatus of the invention is a fully passive device ( does not need a power supply ) and is extremely reliable, it can be adhered or attached to the metallic side of the compact disk. The RFID tag 30 can then be adhered to the apparatus of the present invention. In event the RFID tag 30 fails, the RFID tag 30 can be removed and replaced. If a larger RFID tag is used and it fails, the removal of the large RFID tag may damage the metallic layer of the compact disk, permanently destroying the compact disk. Therefore, this invention allows small RFID tags to perform like larger tags without the problems introduced by larger tags.
[0017] This invention also allows the routing and harvesting of electro-magnetic energy and re-emitting it on a focused area, much like a magnifying glass with sunlight. This has been shown here as a RFID Tag on a compact disk. The outer coil 20 collects the energy and the inner coil 22 re-emits it on a smaller area, focusing and increasing the energy density. Therefore, this invention further allows a coil antenna of an RFID tag not to be within the direct range of a RFID tag reader/writer. Applying this to other types of products not limited to compact disks, an outer coil 20 having a large diameter can be electrically connected to a inner coil 22 via an interconnect 24. The interconnect 24 may be of a predetermined length which results in the inner coil 22 being out of range from a RFID tag reader/writer. An RFID tag is then mounted or attached in a position whereby the RFID tag is in close proximity to the inner coil 22. The outer coil 20 is then positioned or placed in range of the RFID tag reader/writer thus allowing the RFID tag to be operable with the RFID tag reader/writer even if the RFID tag is not within range of the RFID tag reader/writer.
[0018] The present invention extends the operating range of RF / RFID tags by 'virtually' enlarging the size of the tags' coil without physical connection to the tags' coil.
[0019] The thin and light physical characteristic of the invention, as well as it is balanced, does not impede the operation of the compact disk. It also provides an avenue to offset any imbalance caused by the RFID tag.

Claims

1. A method for enhancing the performance of an RFID tag for a compact disk having an inner perimeter and an outer perimeter, comprising the steps: a. attaching a first electrically conductive coil to said compact disk; b. attaching a second electrically conductive coil to said compact disk; c. electrically connecting said first electrically conductive coil to said second electrically conductive coil; and d. attaching said RFID tag to said compact disk; wherein said RFID tag is in close proximity but not in direct contact with said second electrically conductive coil.
2. The method in accordance with claim 1, wherein said first electrically conductive coil is attached to said outer perimeter of said compact disk.
3. The method in accordance with claim 2, wherein said first electrically conductive coil has a diameter substantially similar to diameter of said compact disk.
4. The method in accordance with claim 1, wherein said second electrically conductive coil is attached to said inner perimeter of said compact disk.
5. The method in accordance with claim 1, wherein said first electrically conductive coil is connected in phase with said second electrically conductive coil.
6. The method in accordance with claim 1, wherein said first electrically conductive coil may be re-positioned to provide balancing for said compact disk.
7. The method in accordance with claim 1, wherein said second electrically conductive coil may be re-positioned to provide balancing for said compact disk.
8. An apparatus for enhancing the performance of an RFID tag for a compact disk having an inner perimeter and an outer perimeter, said apparatus comprising: a first electrically conductive coil attached to said outer perimeter of said compact disk; a second electrically conductive coil attached to said inner perimeter of said compact disk; and an electrical interconnect electrically connecting said first electrically conductive coil to said second electrically conductive coil; wherein said RFID tag is further attached onto said compact disk and in close proximity to said RFID tag.
9. The apparatus in accordance with claim 8, wherein said first electrically conductive coil is connected in phase with said second electrically conductive coil.
10. The apparatus in accordance with claim 8, wherein said first electrically conductive coil may be re-positioned to provide balancing for said compact disk.
11. The apparatus in accordance with claim 8, wherein said second electrically conductive coil may be re-positioned to provide balancing for said compact disk.
12. A method for enhancing the range of an RFID tag having a coiled antenna when operating with an RFID tag reader/writer, steps comprising: a. electrically connecting a first electrically conductive coil to a second electrically conductive coil using a interconnect; b. positioning said coiled antenna of said RFID tag in proximity with said second electrically conductive coil; and c. positioning said first electrically conductive coil within range of said RFID tag reader/writer.
13. The method in accordance with claim 12, wherein said first electrically conductive coil is connected in phase with said second electrically conductive coil.
PCT/SG2004/000117 2003-05-07 2004-05-04 A method and apparatus for enhancing performance of an rfid tag for a compact disc Ceased WO2004099821A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG200302474-2 2003-05-07
SG200302474 2003-05-07

Publications (1)

Publication Number Publication Date
WO2004099821A1 true WO2004099821A1 (en) 2004-11-18

Family

ID=33434249

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG2004/000117 Ceased WO2004099821A1 (en) 2003-05-07 2004-05-04 A method and apparatus for enhancing performance of an rfid tag for a compact disc

Country Status (1)

Country Link
WO (1) WO2004099821A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005076205A1 (en) * 2004-02-04 2005-08-18 Bibliotheca Rfid Library Systems Ag Resonant label for applying to a data carrier that is provided with a metallisation
FR2892220A1 (en) * 2005-10-13 2007-04-20 France Telecom OPTICAL DISK WITH OPERATIONAL RFID CONTROL DEVICE DURING DISC READING
EP2000960A3 (en) * 2007-06-07 2009-09-09 ASTRA Gesellschaft für Asset Management mbH & Co. KG Rotating data carrier with detection pad
WO2010029218A1 (en) * 2008-09-10 2010-03-18 Upm Raflatac Oy Casing
EP2041702A4 (en) * 2006-06-30 2010-06-23 Thomson Licensing RADIO FREQUENCY TRANSPONDER FOR USE WITH A SUPPORT
WO2010136931A1 (en) * 2009-05-27 2010-12-02 Nxp B.V. Apparatus for storing digital media that includes a radio frequency identification system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5347508A (en) * 1992-04-22 1994-09-13 Minnesota Mining And Manufacturing Company Optical information storage disk for use with electronic article surveillance systems
WO2000023994A1 (en) * 1998-10-16 2000-04-27 Intermec Ip Corp. Smart optical storage media
US20020021208A1 (en) * 2000-08-11 2002-02-21 Nicholson Mark R. RFID passive repeater system and apparatus
JP2002319009A (en) * 2001-04-23 2002-10-31 Hanex Chuo Kenkyusho:Kk RFID tag structure and electromagnetic coupler of RFID tag
JP2003085502A (en) * 2001-09-10 2003-03-20 Hitachi Chem Co Ltd Non-contact ic tag, and manufacturing method for non- contact ic tag
EP1302893A1 (en) * 2001-10-16 2003-04-16 X-ident GmbH Opto-electronic data carrier with adhered transponder
WO2004046762A1 (en) * 2002-11-15 2004-06-03 Smartag(S) Pte Ltd Rfid tag for an object having metallic portions, tag coupler and method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5347508A (en) * 1992-04-22 1994-09-13 Minnesota Mining And Manufacturing Company Optical information storage disk for use with electronic article surveillance systems
WO2000023994A1 (en) * 1998-10-16 2000-04-27 Intermec Ip Corp. Smart optical storage media
US20020021208A1 (en) * 2000-08-11 2002-02-21 Nicholson Mark R. RFID passive repeater system and apparatus
JP2002319009A (en) * 2001-04-23 2002-10-31 Hanex Chuo Kenkyusho:Kk RFID tag structure and electromagnetic coupler of RFID tag
JP2003085502A (en) * 2001-09-10 2003-03-20 Hitachi Chem Co Ltd Non-contact ic tag, and manufacturing method for non- contact ic tag
EP1302893A1 (en) * 2001-10-16 2003-04-16 X-ident GmbH Opto-electronic data carrier with adhered transponder
WO2004046762A1 (en) * 2002-11-15 2004-06-03 Smartag(S) Pte Ltd Rfid tag for an object having metallic portions, tag coupler and method thereof

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; Class T03, AN 2003-450899 *
PATENT ABSTRACTS OF JAPAN *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005076205A1 (en) * 2004-02-04 2005-08-18 Bibliotheca Rfid Library Systems Ag Resonant label for applying to a data carrier that is provided with a metallisation
US7482933B2 (en) 2004-02-04 2009-01-27 Bibliotheca Rfid Library Systems Ag Resonance tag system for a data medium provided with a metallization
FR2892220A1 (en) * 2005-10-13 2007-04-20 France Telecom OPTICAL DISK WITH OPERATIONAL RFID CONTROL DEVICE DURING DISC READING
EP2041702A4 (en) * 2006-06-30 2010-06-23 Thomson Licensing RADIO FREQUENCY TRANSPONDER FOR USE WITH A SUPPORT
CN101473337B (en) * 2006-06-30 2012-12-26 汤姆森特许公司 Radio frequency transponder for use with a medium
US8677383B2 (en) 2006-06-30 2014-03-18 Thomson Licensing Radio frequency transponder for use with a medium
EP2000960A3 (en) * 2007-06-07 2009-09-09 ASTRA Gesellschaft für Asset Management mbH & Co. KG Rotating data carrier with detection pad
WO2010029218A1 (en) * 2008-09-10 2010-03-18 Upm Raflatac Oy Casing
WO2010136931A1 (en) * 2009-05-27 2010-12-02 Nxp B.V. Apparatus for storing digital media that includes a radio frequency identification system
EP2296149A1 (en) * 2009-05-27 2011-03-16 Nxp B.V. Apparatus for storing digital media that includes a radio frequency identification system
CN102449694A (en) * 2009-05-27 2012-05-09 Nxp股份有限公司 Devices including radio frequency identification systems for storing digital media
US8607261B2 (en) 2009-05-27 2013-12-10 Nxp B.V. Apparatus for storing digital media that includes a radio frequency identification system

Similar Documents

Publication Publication Date Title
US7378971B2 (en) Radio frequency identification tags for digital storage discs
TWI281284B (en) Radio tag antenna structure for an optical recording medium and a case for an optical recording medium with a radio tag antenna
US7292147B2 (en) Optical disk and method of integrating a high gain RFID antenna
JP5195263B2 (en) Information transmission medium management system
JP3647462B2 (en) Spatial magnetic inquiry
US7315248B2 (en) Radio frequency identification tags for use on metal or other conductive objects
EP1357511A2 (en) IC tag system
MXPA06010761A (en) Radio frequency identification tags with compensating elements.
WO2000023994A1 (en) Smart optical storage media
JP2010525465A (en) Radio frequency identification function coupled to conductive signs
EP1245060B1 (en) Radio frequency antenna for an object interrogation device comprising a radiofrequency antenna associated with an electronic circuit
CN1133080C (en) Magnetic detecting technique
KR20060135822A (en) Sheet with IC tag for recording medium and recording medium
WO2004099821A1 (en) A method and apparatus for enhancing performance of an rfid tag for a compact disc
EP1644873A2 (en) Usage modification of rfid transponder
JP4275063B2 (en) Objects with safety labels that identify identity
JP4218182B2 (en) Optical disk with electronic storage function and optical disk with anti-theft function
JP2002290136A (en) Antenna tape and installation structure thereof
JP2006522517A (en) Non-contact reading system for a chip card arranged on an object
CN102449694A (en) Devices including radio frequency identification systems for storing digital media
US6946963B2 (en) Secure storage disc and disc surveillance system
JP4560017B2 (en) Disc media and method for producing disc media
JP4644742B2 (en) RFID tag antenna structure for optical recording media
JP4940776B2 (en) Optical disc recording / reproducing apparatus
KR200251685Y1 (en) structure of sensor for article surveillance system

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase