Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1992-03-04
1994-10-25
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313D, 342 44, 333142, H01L 4102, G01S 1380
Patent
active
053592506
ABSTRACT:
An electronic article surveillance system including a bulk acoustic wave transponder 10 coupled to an antenna 12, an interrogator 14, directional antenna 16 and an output connector 18. The transponder comprises a silicon or glass substrate 20, bus electrodes 22, 24, a launching IDT T0 and a series of "connected" and "unconnected" IDTs T1-T4. The connected/unconnected state of the respective IDTs T1-T4 may be detected and employed to generate an identification code comprising a series of binary digits. A thin copolymer piezoelectric film 26 covers the substrate 20 and electrodes T0-T4.
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"Surface Skimming Bulk Waves, SSBW", by M. Lewis, 1977 Ultrasonies Symposium Proceedings.
Dougherty Thomas M.
The Whitaker Corporation
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