Title:
PASSIVE MODULATION TYPE MICROWAVE DATA CARRIER SYSTEM
Document Type and Number:
Japanese Patent JP3614663
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a passive modulation type microwave data carrier system which can prevent transmit and receive data from being absent owing to phasing and reader writers from interferring with each other and improve the security.
SOLUTION: A reader writer 1 is provided with a frequency control part 18 and the switching of the oscillation frequency of an oscillator part 17 which oscillates a carrier signal to be supplied to the reader writer transmitting circuit part 13 and reader writer receiving circuit part 15 is controlled with the frequency control signal generated by the frequency control part 18 to optionally switch the communication frequency of the whole passive modulation type microwave data carrier system.
Inventors:
Ikuo Takahashi
Application Number:
JP16560898A
Publication Date:
January 26, 2005
Filing Date:
June 12, 1998
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H04B1/59; H04B5/02; G06K17/00; (IPC1-7): H04B1/59; G06K17/00; H04B5/02
Domestic Patent References:
| JP7131403A | ||||
| JP8036052A | ||||
| JP2117224A |
Attorney, Agent or Firm:
Hiroaki Tazawa
Konobu Kato
Konobu Kato
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