Device for wireless transfer of information
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United States of America Patent
Stats
-
Sep 3, 1996
Grant Date -
N/A
app pub date -
Oct 19, 1994
filing date -
Jan 23, 1992
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A device for wireless transfer of information includes a data carrier in the form of a thin card, and a transponder that receives a first microwave signal, modulates it and codes it with data, and reradiates a second microwave signal without adding new energy thereto. The transponder includes at least one antenna device formed using microstrip conductors. The antenna device includes a patch antenna with an antenna layer that acts against a ground plane where the antenna layer and the ground plane are of substantially equal size. The device is characterized in that, it is equipped with a separate card holder with a reflective surface that is larger than said ground plane. The reflective surface increases the range by reradiating the second microwave signal and reducing sensitivity to back lobe reflections.
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