Title:
RFID READER/WRITER ANTENNA DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/079552
Kind Code:
A1
Abstract:
An RFID reader/writer antenna device (101) comprises: a first radiation element (11); a second radiation element (12); a third radiation element (13); baluns (21, 22, 23); a phase shifter (30); and a distributor (4). The radiation elements (11, 12, 13) are constituted by conductor patterns having extension directions that are parallel to each other, and are used in reading or writing of an RFID tag. The distributor (4) connects the first radiation element (11), the second radiation element (12), and the third radiation element (13) with a common input/output unit (Po). The phase shifter (30) imparts a 90° phase difference between the feeding phase of the second radiation element (12) and the feeding phases of the first radiation element (11) and the third radiation element (13). The baluns (21, 22, 23) perform conversion between a balanced signal and an unbalanced signal.
Inventors:
KATO NOBORU (JP)
Application Number:
PCT/JP2020/021191
Publication Date:
April 29, 2021
Filing Date:
May 28, 2020
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
G06K7/10; H01Q21/29; H01Q21/08
Foreign References:
| JP2011097455A | 2011-05-12 | |||
| US20100176924A1 | 2010-07-15 | |||
| JP2002152115A | 2002-05-24 |
Attorney, Agent or Firm:
KAEDE PATENT ATTORNEYS' OFFICE (JP)
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