Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Radar transponder only
Patent
1994-10-20
1995-11-21
Lobo, Ian J.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Radar transponder only
342 44, 310313R, 310313D, G01S 1380, H01L 4108
Patent
active
054691702
ABSTRACT:
A Passive Surface Acoustic Wave Identification Tag ("SAW-ID tag") device utilizes pulse compression techniques and a large number of coding possibilities for identifying articles at enhanced ranges. The SAW-ID tag device provides a piezoelectric substrate having bus bars, spaced electrode taps between the bus bars and a built-in antenna, with an input chirped SAW transducer having a dispersive, complementary matched filter response to an input expanded chirp signal from an expanded linear FM chirp waveform actively generated by a nearby chirp transmitter. The input expanded chirp signal is fed into the input chirped SAW transducer through the built-in antenna, to compresses the input expanded chirp signal into a narrow, compressed pulse signal propagating toward the electrodes taps. The spacing of the electrode taps establishes the desired unique time-ordered coding. The electrode taps sample the narrow, compressed pulse signal and provide narrow, compressed pulse samples propagating a coded, pulse train output transmitted via the antenna to a nearby interrogation means to identify the tagged article. The preferred embodiment is an SAW-ID tag device with a piezoelectric quartz substrate about 1 inch long, a built-in dipole antenna and five (5) spaced electrode taps, establishing several million coding possibilities. Also disclosed are methods of identifying articles using an SAW-ID tag device, and methods of selectively disconnecting and connecting electrodes to facilitate mass production.
REFERENCES:
patent: 3706094 (1972-12-01), Cole et al.
patent: 4734698 (1988-03-01), Nysen et al.
patent: 4737790 (1988-04-01), Skeie et al.
patent: 4746830 (1988-05-01), Hollandd
patent: 4951057 (1990-08-01), Nagel
L. Reindl and W. Ruile, Programmable Reflectors for SAW-ID Tags, IEEE Ultonics Symposium (1993), 6 pages.
Lobo Ian J.
Tereschuk George B.
The United States of America as represented by the Secretary of
Zelenka Michael
LandOfFree
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