Radio-frequency identification device with foam substrate
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United States of America Patent
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Feb 18, 2014
Grant Date -
Jun 3, 2010
app pub date -
Dec 3, 2008
filing date -
Dec 3, 2008
priority date (Note) -
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Abstract
The present invention encompasses an antenna (12) for use with a radio-frequency identification transponder (10) that performs optimally in free space and near optimally when near a conductive surface. The radio-frequency identification transponder (10) broadly comprises an antenna (12); an integrated circuit (14); a matching circuit (16) interposed between the antenna (12) and integrated circuit (14); and a substrate (18). The antenna (12) is designed with a length so the antenna (12) as a microstrip resonates at a starting frequency and a matching circuit is constructed. The antenna (12) is placed near a conductive surface and the length of the antenna is adjusted until the antenna reactance is approximately the opposite of the integrated circuit reactance.
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