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| moses electronic, C2, C2-CARD, chipcard, contactless, close-coupled, stereo, secure |
Not the environment gouverns the access to the card data - the card itself does:
The figure attempts to give an idea of how the effect is
achieved. It shows a cross section availing a plane where all the
centers of both the coupler's antenna pair and the card's antenna
pair are located in at the same time. Here, the coupler's antenna
pair is supposed to be located fixed in space (the upper pair of
short black bars, fed from the generator through two opposite phase
shifters). On the other hand, another pair of short bars represents
the card's antenna pair that is not fixed in space and therefore
depicted at several distinct positions. For the drawing, these
positions are selected as typical for the different situations in
order to prove the principle of operation: The card works in such
positions (green bars), where not only the magnetic flux (the solid
blue circles) penetrates the card as most dense and perpendicular,
but also the
two timing vectors (the straight lines in the tiny circles) in both
of the card's antennas are most perpendicular to each other. The
long blue dash-dotted straight lines are polarity separators: Here,
one of both fields
ceases because of the flux lines running parallel to the
card's antenna. The yellow position is weak, the red ones do not
operate.
Several patent applications are granted or pending, e. g. 4327334 (Germany), 94111981 (Europe), 5,648,761 (USA).
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