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US 5,945,938 AGranted
RF identification transponder
AssigneeNational University of Singapore
InventorsYan Wah Chia, Tsien Ming Au
Life of this patent
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Abstract
An RF identification transponder comprises a substrate layer, and an array of M*N antenna elements formed on the substrate layer, where M and N are integers. The antenna elements have a common predetermined resonant frequency f.sub.r. The resonant frequency of the transponder's antenna element array allows it to be identified apart from other transponders, each having an antenna element array with a different resonant frequency.
Claims30
In a transponder reader system, a plurality of RF identification transponders each of which comprises:
- a substrate layer;
- and
- an array of M*N antenna elements formed on the substrate layer, wherein the antenna elements have a common predetermined resonant frequency f.sub.r and M and N are integers,
- each of the transponders in the system having a different predetermined resonant frequency, wherein the respective different resonant frequencies of the antenna elements allow identification of the transponders.
1 more element
Dependencies are inferred from the claim text.