Field improving system provided with resonator

• US 8,305,217 B2
• Filed: 11/21/2007
• Issued: 11/06/2012
• Est. Priority Date: 11/21/2006
• Status: Expired due to Fees

• Current Assignee: Smart Srl (Rocket Software Incorporated)
• Original Assignee: Smart Srl (Rocket Software Incorporated)
• Inventors: Arimura, Kunitaka
• Primary Examiner(s): MULLEN, THOMAS J
• Application Number:
  US12/312,623
• Publication Number:
  US 20090315680A1
• Time in Patent Office: 1,812 Days
• Field of Search: 340/572.1, 340/572.5, 340/10.1, 340/10.51
• US Class Current: 340/572.5
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 19/07781 the coil being fabricated in a winding process
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 7/06 with core of ferromagnetic material H01Q7/02 takes precedence
• CPC Class Codes: H04B 5/00 Near-field transmission systems, e.g. inductive or capacitive transmission systems
• CPC Class Codes: H04B 5/73 for taking measurements, e.g. using sensing coils
• CPC Class Codes: H04B 5/77 for interrogation

Abstract

The invention provides a system for improving communication statuses among a sensor, a tag and a non-contact type IC card for RFID (Radio Frequency Identification). In the present system, a resonator is added to a sensor a tag, or non-contact type IC card. The resonator is constituted by a coil and a capacitor. Further a magnetic substance is attached to the coil of the resonator so as to intensify the magnetic field.

Claims

1. A wireless communication field improving system using resonators to enhance performance of a radio frequency identification (RFID) system, the field improving system comprising:

a sensor, and an IC tag or a non-contact type IC card;

the sensor, or the IC tag or non-contact type IC card having a magnetic substance and a first coil wound spirally on a face of said magnetic substance; and

a first resonator having a second coil and a first capacitor connected to said second coil, wherein;

said second coil is wound spirally on the face of said magnetic substance and is arranged in the same axial direction as the axial direction of said first coil.

2. The field improving system provided with resonators according to claim 1, wherein:

a cross-section of said magnetic substance perpendicular to the axis of said first coil shows a rectangular or circular shape.

3. The field improving system provided with resonators according to claim 1, further comprising:

a reader/writer for reading transmitted signals between said sensor for RFID and said IC tag or said non-contact type IC card, and a computer for controlling mechanisms based on transmitted read signals by said reader/writer.

4. A wireless communication field improving system using resonators to enhance performance of a radio frequency identification (RFID) system, the field improving system comprising:

a sensor, and an IC tag or a non-contact type IC card;

the sensor, or the IC tag or non-contact type IC card having a magnetic substance and a first coil wound around said magnetic substance; and

a first resonator having a second coil and a first capacitor connected to said second coil, wherein;

said second coil is wound spirally on the face of said magnetic substance and is arranged in the same axial direction as the axial direction of said first coil.

5. A wireless communication field improving system using resonators to enhance performance of a radio frequency identification (RFID) system, the field improving system comprising:

a sensor, and an IC tag or a non-contact type IC card;

the sensor, or the IC tag or non-contact type IC card having a magnetic substance and a first coil wound around said magnetic substance; and

a first resonator having a second coil and first capacitor connected to said second coil, wherein;

said second coil is wound spirally on the face of said magnetic substance and is arranged such that the axis of said second coil is perpendicular to the axis of said first coil.

6. The field improving system provided with resonators according to claim 5, wherein:

said first coil is wound around one end portion of said magnetic substance and said second coil is formed on a portion of the face of said magnetic substance where said first coil is not wound.

7. The field improving system provided with resonators according to claim 6, further comprising:

a third resonator having a fourth coil wound around said magnetic substance and a third capacitor connected to said fourth coil, wherein;

said fourth coil is arranged such that its axis is parallel to the axis of said first coil, and said fourth coil is wound around said magnetic substance such that its excited magnetic field is reversely directed to the magnetic field generated by said first coil.

8. The field improving system provided with resonators according to claim 7, wherein:

said third resonator is arranged on the other end of said magnetic substance than the end where said first coil is wound around.

9. The field improving system provided with resonators according to claim 5, further comprising:

a second resonator having a third coil and a second capacitor connected said third coil, wherein;

said third coil is wound around said magnetic substance and is arranged such that the axis of said third coil is parallel to the axis of said first coil.

10. The field improving system provided with resonators according claim 9, wherein:

said second resonator is arranged between said first coil and said first resonator.