RFID TAG, RFID TAG SET AND RFID SYSTEM

• US 20110227710A1
• Filed: 08/31/2009
• Published: 09/22/2011
• Est. Priority Date: 09/05/2008
• Status: Abandoned Application

• Current Assignee: Omron Corporation
• Original Assignee: Omron Corporation
• Inventors: Nogami, Hidekatsu
• Application Number:
  US13/062,034
• Publication Number:
  US 20110227710A1
• Time in Patent Office: Days
• US Class Current: 340/10.51
• 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 19/07771 the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object
• CPC Class Codes: H01Q 1/2208 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 methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: H01Q 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 5/00 Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements combinations of separate active antenna units operating in different wavebands and connected to a common feeder system H01Q21/30
• CPC Class Codes: H01Q 5/25 Ultra-wideband [UWB] systems, e.g. multiple resonance systems; Pulse systems
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

Provided is an RFID tag by which the communication distance is not shortened even when wireless communication is performed with a metal object and broadband and high gain are achieved. An RFID tag set and an RFID system are also provided. In an RFID tag (1), an antenna section (4) is arranged on a first dielectric substrate (3), a grounding conductive plate (2) is arranged between the first dielectric substrate (3) and a second dielectric substrate (5), and the electrical length of the antenna section and that of the grounding conductive plate are set different from each other.

Claims

1. An RFID tag comprising:

a grounding conductive plate;

a first dielectric substrate stacked on one surface of the grounding conductive plate;

an antenna section including a first antenna conductor and a second antenna conductor arranged on the first dielectric substrate;

an IC chip for connecting the first antenna conductor and the second antenna conductor;

a connecting portion for connecting either the first antenna conductor or the second antenna conductor and the grounding conductive plate; and

a second dielectric substrate arranged on the other surface of the grounding conductive plate, wherein

an electrical length of the antenna section and an electrical length of the grounding conductive plate are different.

2. The RFID tag according to claim 1, wherein the connecting portion is a via or is formed by bending one end side of the first antenna conductor.

3. The RFID tag according to claim 1, wherein the first antenna conductor and the second antenna conductor differ in length.

4. The RFID tag according to claim 1, wherein the second antenna conductor is formed to a meander shape.

5. The RFID tag according to claim 1, wherein the second antenna conductor is formed with one end side folded back.

6. The RFID tag according to claim 1, wherein the grounding conductive plate is formed to a meander shape.

7. An RFID tag set comprising the RFID tag according to claim 1 attached to an object, and a conductive plate connectable with the RFID tag, wherein

the RFID tag set has the conductive plate being attached to the object while being interposed between the RFID tag and the object.

8. An RFID system comprising the RFID tag according to claim 1, and a reader or a reader/writer that performs wireless communication with the RFID tag.

9. An RFID system comprising the RFID tag set according to claim 7, and a reader or a reader/writer that performs wireless communication with the RFID tag set.