Title:
A radio frequency identification system and a wireless communication method
Document Type and Number:
Japanese Patent JP5913148
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To securely perform communication between a radio tag of underground equipment and a reader on the ground, if a passive radio tag is used.SOLUTION: In a radio tag system performing transmission and reception of information by radio between the radio tag installed on the underground equipment and the reader on the ground, there is assumed a curve surface on which the radio tag and the reader are disposed at two focal points, and a configuration is made to dispose each reflector that reflects a radio wave having a shape constituted by a part of the curve surface, on each back face of the radio tag and the reader disposed opposite to each other. The reflectors are constituted by two ellipse curve surfaces formed of parts of the ellipse curve surface having two focal points at the positions of the radio tag and the reader.
Inventors:
Hideyuki Tsuboi
Atsuya Ando
Mamoru Akimoto
Hiroyuki Nakamura
Atsuya Ando
Mamoru Akimoto
Hiroyuki Nakamura
Application Number:
JP2013027785A
Publication Date:
April 27, 2016
Filing Date:
February 15, 2013
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H01Q19/13; G06K17/00; G06K19/077; H01Q15/16; H04B1/59; H04B5/02
Domestic Patent References:
| JP2011243171A | ||||
| JP2003249872A | ||||
| JP2003283365A | ||||
| JP2007299232A |
Attorney, Agent or Firm:
Furuya Fumio
Toshihide Mori
Toshihide Mori