Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Kanjiro Shimizu0
Date of Patent
March 15, 2011
Patent Application Number
11774239
Date Filed
July 6, 2007
Patent Primary Examiner
Patent abstract
The present invention provides a contactless communication circuit having both a contactless communication card function and a contactless communication reader/writer function, which includes a capacitor section that forms a parallel-resonant circuit with a contactless communication antenna; and a capacitance switching section that makes a capacitance of the capacitor section effective in a mode of the contactless communication card function, and reduces the capacitance of the capacitor section in a mode of the contactless communication reader/writer function.
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