Noncontact type IC card

Details Noncontact type IC card Noncontact type IC card

2005-09-27

2005-09-27

Chen, Shih-Chao (Department: 2821)

Communications: radio wave antennas

Antennas

With variable reactance for tuning antenna

C343S741000, C343S751000

Reexamination Certificate

active

06950074

ABSTRACT:
The present invention relates to an electronic device that suppresses reduction in reception sensitivity and occurrence of distortion when IC cards are used while stacked. A loop antenna equipped on the IC card has up to four turns, and is designed so that one turn, for example, has a first linear portion, a first curved line portion, a second linear portion, and a second curved line portion. When two electronic devices having a first loop antenna and a second loop antenna, respectively, are stacked onto one another, the corners of the loop antennas do not overlap. For example, the corner formed by first curved line portion and the second linear portion of the first loop antenna is overlapped with the first curved line portion of the second loop antenna. The first and second loop antennas are shaped such that when two electronic devices are stacked, their respective loop antennas are superimposed in the opposite direction so that the corners are not overlapped and the amount of overlap as a whole is reduced. The present invention may be applied to an IC card for receiving/transmitting data under non-contact state.

REFERENCES:
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Austrialian Search Report and Written Opinion dated Jun. 10, 2003.
International Search Report.
EPO Search Report dated Mar. 31, 2005.

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