WO2005081018A1 - Transponder for an rfid-system - Google Patents

Transponder for an rfid-system Download PDF

Info

Publication number
WO2005081018A1
WO2005081018A1 PCT/SE2005/000232 SE2005000232W WO2005081018A1 WO 2005081018 A1 WO2005081018 A1 WO 2005081018A1 SE 2005000232 W SE2005000232 W SE 2005000232W WO 2005081018 A1 WO2005081018 A1 WO 2005081018A1
Authority
WO
WIPO (PCT)
Prior art keywords
transponder
aerial
circuit board
battery
enquiry signal
Prior art date
Application number
PCT/SE2005/000232
Other languages
French (fr)
Swedish (sv)
Inventor
Mikael Willgert
Original Assignee
Tagmaster Ab
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 Tagmaster Ab filed Critical Tagmaster Ab
Publication of WO2005081018A1 publication Critical patent/WO2005081018A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V15/00—Tags attached to, or associated with, an object, in order to enable detection of the object

Definitions

  • the present invention relates to a transponder for an RFID- system intended to be present in a vehicle or to be carried by persons .
  • a system has been established in Oslo in which a fee must be paid when the vehicle passes a toll station along the boundary of the region of the city for which a fee must be paid. Payment can be made by subscribers through the reading of a transponder in the vehicle each time the vehicle passes ,a toll station on its way into the city region.
  • transponders are read by what are known as "commu- nicators" located, for example, at doors for access control or to enable a person to gain access to certain premises. Furthermore, there is a need to label with transponders luggage that is to be transported by aeroplane for identification and for luggage management .
  • transponders which may even be of a type that is disposable. This is valid for, for example, temporary visitors and temporary passengers.
  • known transponders are built up on a support layer of PCB-type, to which an aerial and the required electronic components have been attached. A holder for a battery is also present on the board. This means that the transpond- ers are relatively large and relatively expensive to manufacture.
  • the present invention offers a simple and a cheap trans- ponder.
  • the present invention thus relates to a transponder that can be read by means of a transmitter/receiver unit arranged to transmit an enquiry signal to the transponder, where the transponder is arranged to reflect the enquiry signal and in this way modulate the enquiry signal with information in a memory in the transponder, and where the transmitter/receiver unit is arranged to receive the modulated enquiry signal,
  • transponder comprises a circuit board and an aerial, together with a battery, and is characterised in that the aerial is designed having two legs and an arc running between the legs such that the aerial has the form essentially of a circle, in that the radius of the aerial allows the said board to be located within the aerial, in that the board is attached at the free end of each leg such that the board is supported by the aerial, and in that the said battery is supported by the said board.
  • FIG. 1 shows schematically a communication link
  • - Figure 2 shows the present transponder in a plan view from a first direction
  • - Figure 3 shows the present transponder in a plan view from the opposite direction to that shown in Figure 2.
  • RFID Radio Frequency Identification
  • the systems contain identification tokens (ID-tokens) and communicators. The applicant supplies such identification systems.
  • FIG. 1 shows a communication unit for the identification of a vehicle.
  • the communication unit comprises a transponder 1 and a communicator in the form of a receiver/transmitter unit 2 .
  • the communicator 2 is arranged to transmit an enquiry signal 3 towards the transponder 1 -
  • the transponder is arranged to receive the enquiry signal and thereby reflect and modulate the enquiry signal.
  • the communicator 2 is arranged to receive the reflected signal 4 and to decode its information content.
  • the communicator 2 is connected to a supervisory computer system 5 of a suitable, known type.
  • the ID-token is attached to the person.
  • the ID- token is attached to the inner surface of the windscreen of the vehicle that is to be identified.
  • the identity can be registered by a communicator at a certain, short distance, such as, for example, five to ten me- tres. Depending on the design, it is also possible to read other information from and write other information into the ID-token, in addition to reading an identity, with the aid of the communicator.
  • the relatively short range makes it possible to communicate with the ID-tokens within a communication area that is geographically limited.
  • the present invention concerns such a transponder 1 that can be read by means of a transmitter/receiver unit 2 arranged to transmit an enquiry signal towards the transponder, where the transponder is arranged to reflect the enquiry signal and thereby to modulate the enquiry signal with information in a memory within the transponder.
  • the transmitter/receiver unit 2 is arranged to receive the modulated enquiry signal.
  • the transponder comprises ' a circuit board 7 and an aerial 6 together with a battery 8.
  • the circuit board supports the required electronic circuits and components.
  • the aerial 6 is designed having two ⁇ legs 9, 10 and an arc 11 running between the legs such that the form of the aerial is principally circular.
  • the radius of the aerial 6 allows the said circuit board 7 to be accommodated within the aerial .
  • the board 7 is at- tached at the free end of each leg 9, 10 such that the board is supported by the aerial 6. Furthermore, the said battery 8 is supported by the said board 7.
  • the aerial 6 is con- structed from a metal wire with a diameter of approximately 1 millimetre. This construction ensures that the aerial 8 is very stiff in its own plane, relative to the rigidity that is required to support in a stable manner the board 7 and the battery 8.
  • the said board 7 has a concavity 12 that has a circumference that corresponds to a part of a circle, where the said circle has a radius that is larger than the said battery 8, which has the form of a circle. Furthermore, a holder 13, 14 is attached to the said board 7 and arranged to support the battery 8 in the said concavity 7. This means that that space is also avail- able for the battery 8 within the circularly shaped part of the aerial ⁇ .
  • the transponder 1 according to the invention is thus very compact and mechanically stable. Furthermore, a special sup- porting layer, of PCB-type, . in order to support the aerial, the circuit board and the battery, has been avoided. Thus the transponder will be both small and cheap to manufacture.
  • the transponder can be equipped with a surrounding plastic layer in order to facilitate its handling.
  • transponder can be varied with respect to, for example, the location of the battery and the locations of the components on the circuit board.

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  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

A transponder (1) that can be read by means of a transmitter/receiver unit (2) arranged to transmit an enquiry signal to the transponder, where the transponder (1) is arranged to reflect the enquiry signal and thereby to modulate -the enquiry signal with information in a memory in the transponder, and where the transmitter/receiver unit (2) is arranged to receive the modulated enquiry signal, which transponder comprises a circuit board (7) and an aerial (6) together with a battery (8). The invention is characterized in that the aerial (6) has been designed to have two legs (9, 10) and an arc (11) running between the legs (9, 10) such that the shape of the aerial is essentially circular, in that the radius of the aerial (6) allows the said circuit board (7) to be located within the aerial (6), in that the circuit board (7) is attached at the free end of each leg (9, 10) such that the circuit board is supported by the aerial, and in that the said battery (8) is supported by the said circuit board (7).

Description

Transponder for an RFID-system.
The present invention relates to a transponder for an RFID- system intended to be present in a vehicle or to be carried by persons .
In recent years, fees have begun to be levied for driving with cars into a number of cities, such as Oslo and London.
A system has been established in Oslo in which a fee must be paid when the vehicle passes a toll station along the boundary of the region of the city for which a fee must be paid. Payment can be made by subscribers through the reading of a transponder in the vehicle each time the vehicle passes ,a toll station on its way into the city region.
Furthermore, it is becoming ever more common that persons are equipped with a transponder for the purpose of identification. Such transponders are read by what are known as "commu- nicators" located, for example, at doors for access control or to enable a person to gain access to certain premises. Furthermore, there is a need to label with transponders luggage that is to be transported by aeroplane for identification and for luggage management .
There is a need, both in the case of vehicles and in the case of persons, for small and cheap transponders, which may even be of a type that is disposable. This is valid for, for example, temporary visitors and temporary passengers. On the other hand, known transponders are built up on a support layer of PCB-type, to which an aerial and the required electronic components have been attached. A holder for a battery is also present on the board. This means that the transpond- ers are relatively large and relatively expensive to manufacture.
The present invention offers a simple and a cheap trans- ponder.
The present invention thus relates to a transponder that can be read by means of a transmitter/receiver unit arranged to transmit an enquiry signal to the transponder, where the transponder is arranged to reflect the enquiry signal and in this way modulate the enquiry signal with information in a memory in the transponder, and where the transmitter/receiver unit is arranged to receive the modulated enquiry signal, which transponder comprises a circuit board and an aerial, together with a battery, and is characterised in that the aerial is designed having two legs and an arc running between the legs such that the aerial has the form essentially of a circle, in that the radius of the aerial allows the said board to be located within the aerial, in that the board is attached at the free end of each leg such that the board is supported by the aerial, and in that the said battery is supported by the said board.
The invention will be described in more detail below, par- tially in association with an embodiment of the invention shown on the attached drawing, where
- Figure 1 shows schematically a communication link
- Figure 2 shows the present transponder in a plan view from a first direction, and - Figure 3 shows the present transponder in a plan view from the opposite direction to that shown in Figure 2. Several different automatic identification systems tha-t use radio frequencies are known, so called RFID (Radio Frequency Identification) systems. The systems contain identification tokens (ID-tokens) and communicators. The applicant supplies such identification systems.
Figure 1 shows a communication unit for the identification of a vehicle. The communication unit comprises a transponder 1 and a communicator in the form of a receiver/transmitter unit 2 . The communicator 2 is arranged to transmit an enquiry signal 3 towards the transponder 1 - The transponder is arranged to receive the enquiry signal and thereby reflect and modulate the enquiry signal. The communicator 2 is arranged to receive the reflected signal 4 and to decode its information content. The communicator 2 is connected to a supervisory computer system 5 of a suitable, known type.
In the case of persons, the ID-token is attached to the person. In the case of vehicles, it is appropriate that the ID- token is attached to the inner surface of the windscreen of the vehicle that is to be identified.
The identity can be registered by a communicator at a certain, short distance, such as, for example, five to ten me- tres. Depending on the design, it is also possible to read other information from and write other information into the ID-token, in addition to reading an identity, with the aid of the communicator.
The relatively short range makes it possible to communicate with the ID-tokens within a communication area that is geographically limited. The present invention concerns such a transponder 1 that can be read by means of a transmitter/receiver unit 2 arranged to transmit an enquiry signal towards the transponder, where the transponder is arranged to reflect the enquiry signal and thereby to modulate the enquiry signal with information in a memory within the transponder. The transmitter/receiver unit 2 is arranged to receive the modulated enquiry signal.
The transponder comprises' a circuit board 7 and an aerial 6 together with a battery 8. The circuit board supports the required electronic circuits and components.
According to the invention, the aerial 6 is designed having two ■ legs 9, 10 and an arc 11 running between the legs such that the form of the aerial is principally circular. The radius of the aerial 6 allows the said circuit board 7 to be accommodated within the aerial .
Furthermore, according to the invention, the board 7 is at- tached at the free end of each leg 9, 10 such that the board is supported by the aerial 6. Furthermore, the said battery 8 is supported by the said board 7.
According to one preferred embodiment, the aerial 6 is con- structed from a metal wire with a diameter of approximately 1 millimetre. This construction ensures that the aerial 8 is very stiff in its own plane, relative to the rigidity that is required to support in a stable manner the board 7 and the battery 8.
According to a further preferred embodiment, the said board 7 has a concavity 12 that has a circumference that corresponds to a part of a circle, where the said circle has a radius that is larger than the said battery 8, which has the form of a circle. Furthermore, a holder 13, 14 is attached to the said board 7 and arranged to support the battery 8 in the said concavity 7. This means that that space is also avail- able for the battery 8 within the circularly shaped part of the aerial β.
The transponder 1 according to the invention is thus very compact and mechanically stable. Furthermore, a special sup- porting layer, of PCB-type, . in order to support the aerial, the circuit board and the battery, has been avoided. Thus the transponder will be both small and cheap to manufacture.
The transponder can be equipped with a surrounding plastic layer in order to facilitate its handling.
It is clear that the detailed design of the transponder can be varied with respect to, for example, the location of the battery and the locations of the components on the circuit board.
Thus, the present application is not to be regarded as limited to the embodiments specified above, since it can be varied within the scope of the attached claims.

Claims

Claims .
1. A transponder (1) that can be read by means of a transmitter/receiver unit (2) arranged to transmit an enquiry signal to the transponder, where the transponder (1) is arranged to reflect the enquiry signal and thereby to modulate the enquiry signal with information in a memory in the transponder and where the transmitter/receiver unit (2) is arranged to receive the modulated enquiry signal, which transponder com- prises a circuit board (7) and an aerial (6) together with a battery (8), c h a r a c t e r i z e d in that the aerial (6) has been designed to have two legs (9, 10) and an arc
(11) running between the legs (9, 10) such that the shape of the aerial is essentially circular, in that the radius of the aerial (6) allows the said circuit board (7) to be located within the aerial (6), in that the circuit board (7) is attached at the free end of each leg (9, 10) such that the circuit board is supported by the aerial, and in that the said battery (8) is supported by the said circuit board (7) .
2 . A transponder according to claim 1, c h a r a c t e r i z e d in that the aerial (11) is constructed from metal wire with a diameter of approximately 1 millimetre.
3. A transponder according to claim 1 or 2, c h a r a c t e r i z e d • in that the said circuit board (7) has a concavity
(12) that has a circumference equivalent to a part of a circle, in that the said circle has a radius that is larger than the said battery (8), which has the form of a circle, and in that a holder (13, 14) is attached to the said circuit board
(7) and arranged to support the said battery (8) in the said concavity (12) .
PCT/SE2005/000232 2004-02-24 2005-02-21 Transponder for an rfid-system WO2005081018A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0400424A SE525112C2 (en) 2004-02-24 2004-02-24 Transponder for RFID system used for e.g. paying road tolls, has antenna comprising arms connected via arch and secured to circuit board
SE0400424-8 2004-02-24

Publications (1)

Publication Number Publication Date
WO2005081018A1 true WO2005081018A1 (en) 2005-09-01

Family

ID=31989592

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2005/000232 WO2005081018A1 (en) 2004-02-24 2005-02-21 Transponder for an rfid-system

Country Status (2)

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SE (1) SE525112C2 (en)
WO (1) WO2005081018A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5491483A (en) * 1994-01-05 1996-02-13 Texas Instruments Incorporated Single loop transponder system and method
US6339385B1 (en) * 1997-08-20 2002-01-15 Micron Technology, Inc. Electronic communication devices, methods of forming electrical communication devices, and communication methods
WO2003044892A1 (en) * 2001-11-22 2003-05-30 Valtion Teknillinen Tutkimuskeskus Modified loop antenna with omnidirectional radiation pattern and optimized properties for use in an rfid device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5491483A (en) * 1994-01-05 1996-02-13 Texas Instruments Incorporated Single loop transponder system and method
US6339385B1 (en) * 1997-08-20 2002-01-15 Micron Technology, Inc. Electronic communication devices, methods of forming electrical communication devices, and communication methods
WO2003044892A1 (en) * 2001-11-22 2003-05-30 Valtion Teknillinen Tutkimuskeskus Modified loop antenna with omnidirectional radiation pattern and optimized properties for use in an rfid device

Also Published As

Publication number Publication date
SE0400424L (en) 2004-11-30
SE0400424D0 (en) 2004-02-24
SE525112C2 (en) 2004-11-30

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