Method and a system for reducing the influence of disturbing signals in transponder applications
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United States of America Patent
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Feb 24, 2004
Grant Date -
Dec 6, 2001
app pub date -
Mar 7, 2001
filing date -
Mar 13, 2000
priority date (Note) -
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Abstract
In a transponder application, at least one transponder and at least one interrogating reader, the reader has at least two receiving units so disposed, for instance at different distances, relatively to the transponder, that signals from the same are received at different levels by the receiving units. By combination, e.g. by subtraction, of the received signals, disturbing signals received at practically the same level are eliminated while the difference of useful transponder signals is available. This substantially improves system performance in transponder applications and allows to increase the operating distance between reader and transponder.
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