Radio frequency identification transponder employing patch antenna
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United States of America Patent
Stats
-
Apr 10, 2001
Grant Date -
N/A
app pub date -
Nov 13, 1998
filing date -
Mar 13, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A radio-frequency identification (RFID) transponder (tag) in accordance with the principles of the invention includes a patch antenna. The patch antenna may be co-located with RFID circuitry and an impedance matching circuit on one side of a substrate. A ground plane may be formed on the opposite side of the substrate. A quarter wave transformer may provide an 'RF short' to ground to connect the RFID circuitry on one side of the substrate with a ground plane located on the opposite side of the substrate.
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