RFID READER/WRITER AND RFID TAG SYSTEM

• US 20130241703A1
• Filed: 03/14/2013
• Published: 09/19/2013
• Est. Priority Date: 03/15/2012
• Status: Abandoned Application

• Current Assignee: Omron Corporation
• Original Assignee: Omron Corporation
• Inventors: NOGAMI, Hidekatsu
• Application Number:
  US13/826,287
• Publication Number:
  US 20130241703A1
• Time in Patent Office: Days
• US Class Current: 340/10.1
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 7/10168 the powering being adversely affected by environmental influences, e.g. unwanted energy loss in the interrogation signal due to metallic or capacitive objects in the proximity of the interrogation device or in the proximity of the interrogated record carrier
• CPC Class Codes: G06K 7/10346 the antenna being of the far field type, e.g. HF types or dipoles
• CPC Class Codes: H01Q 1/2216 used in interrogator/reader equipment
• CPC Class Codes: H01Q 9/045 with particular feeding means for circular polarisation H01Q9/0428

Abstract

An aspect of the present invention provides an RFID reader/writer in which a null point is not generated. The RFID reader/writer includes an RFID tag and an RFID reader/writer. The RFID reader/writer and the RFID tag conduct communication with each other while an antenna of the RFID reader/writer and an antenna of the RFID tag are slanted.

Claims

1. An RFID reader/writer that communicates with an RFID tag, the RFID reader/writer comprising an antenna that transmits and receives a linearly-polarized radio wave having a polarization plane slanted at a predetermined angle with respect to a reflecting surface.

2. The RFID reader/writer according to claim 1, wherein the predetermined angle is an angle at which a reflected wave from the reflecting surface and a direct wave from the antenna do not interfere with each other to be weakened.

3. The RFID reader/writer according to claim 2, wherein the predetermined angle is about 45 degrees.

4. The RFID reader/writer according to claim 1, wherein the antenna is one of a patch antenna, a dipole antenna, or a slot antenna.

6. The RFID reader/writer according to claim 2, wherein the antenna is one of a patch antenna, a dipole antenna, or a slot antenna.

7. The RFID reader/writer according to claim 3, wherein the antenna is one of a patch antenna, a dipole antenna, or a slot antenna.

5. An RFID system, comprising:

an RFID tag; and

an RFID reader/writer, wherein the RFID tag and the RFID reader/writer communicate with each other,

wherein the RFID reader/writer includes an antenna that transmits and receives a linearly-polarized radio wave having a polarization plane slanted at a predetermined angle with respect to a reflecting surface,

an antenna of the RFID tag is disposed so as to have a polarization plane identical to the polarization plane of the radio wave, and

the antenna of the RFID tag receives and responds to the radio wave emitted from the antenna of the RFID reader/writer.