Title:
COMMUNICATION SYSTEM, READER/WRITER APPARATUS AND RF-ID TAG
Document Type and Number:
WIPO Patent Application WO/2006/016401
Kind Code:
A1
Abstract:
When receiving an ASK modulated wave from an R/W apparatus (1) during downstream communication, an RF-ID tag (2) generates a clock from the ASK modulated wave, and demodulates, in synchronism with the clock, the data addressed to the RF-ID tag (2). When receiving, during upstream communication, a modulated wave in which the RF band carrier has been modulated by a periodic waveform signal, the RF-ID tag (2) generates a clock from the modulated wave, and modulates, in synchronism with the clock, and transmits the data addressed to the R/W apparatus (1). In this way, the RF-ID tag (2) can generates, without using any frequency divider that frequency divides the RF band carrier to generate a clock, the clocks and transmit the data to the R/W apparatus (1).
Inventors:
SHIMOZAWA MITSUHIRO (JP)
TAKAYAMA NAOHISA (JP)
HAYASHI RYOJI (JP)
TAKAYAMA NAOHISA (JP)
HAYASHI RYOJI (JP)
Application Number:
PCT/JP2004/011482
Publication Date:
February 16, 2006
Filing Date:
August 10, 2004
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
SHIMOZAWA MITSUHIRO (JP)
TAKAYAMA NAOHISA (JP)
HAYASHI RYOJI (JP)
SHIMOZAWA MITSUHIRO (JP)
TAKAYAMA NAOHISA (JP)
HAYASHI RYOJI (JP)
International Classes:
G06K17/00; H04B5/02; H04L27/02; (IPC1-7): H04L27/02; G06K17/00; H04B5/02
Foreign References:
| JP2000275337A | 2000-10-06 | |||
| JPH10107859A | 1998-04-24 | |||
| JPH10233718A | 1998-09-02 | |||
| JPH11272814A | 1999-10-08 | |||
| JP2003304175A | 2003-10-24 | |||
| JP2001175825A | 2001-06-29 |
Attorney, Agent or Firm:
Tazawa, Hiroaki (7-1 Kasumigaseki 3-chom, Chiyoda-ku Tokyo 13, JP)
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