Contactless communication circuit and portable terminal

Details Contactless communication circuit and portable terminal Contactless communication circuit and portable terminal

2011-03-15

2011-03-15

Chen, Shih-Chao (Department: 2821)

Communications: electrical

Condition responsive indicating system

Specific condition

C343S742000

Reexamination Certificate

active

07907056

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.

REFERENCES:
patent: 7546089 (2009-06-01), Bellantoni
patent: 2005/0092836 (2005-05-01), Kudo
patent: 2006/0052055 (2006-03-01), Rowse et al.
patent: 2007/0046430 (2007-03-01), Yamazaki et al.
patent: 1 560 149 (2005-08-01), None
patent: 2001155120 (2001-06-01), None
patent: 2004-266729 (2004-09-01), None
patent: WO 2005/013506 (2005-02-01), None
patent: WO 2006/054070 (2006-05-01), None

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