Recognition tag for use in a system for identifying distant item

Details Recognition tag for use in a system for identifying distant item Recognition tag for use in a system for identifying distant item

1994-11-28

1998-03-31

Swarthout, Brent A.

Communications: electrical

Condition responsive indicating system

Specific condition

310312R, 310313B, 310313D, G08B 1314

Patent

active

057343268

ABSTRACT:
Passive recognition tags are disclosed that function along with a transceiver and a processor in a system which identifies distant items. Each tag includes a SAW substrate on which sync and tap transducers are commonly connected between positive and negative buses across which an interrogating signal is applied through an antenna. In response to that signal, in phase identification code signals pass to the antenna from both the sync transducer and the tap transducers. Transducer spacing is minimized relative to acoustic reflection considerations by disposing the tap transducers in a plurality of channels which are aligned in parallel across the width of the substrate on both output sides of the sync transducer.

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William J. Skudera, Jr., "Sequential Circuitry For Recreating CW Components rom Chirp-Z Pulses", Ser. No. 07/977,354, Filed Nov. 17, 1992;.
William J. Skudera, Jr., "SAW Tapped Delay Lines For New Potential Circuit Applications", 42nd Annual Frequency Control Symposium --1988.
L. Reindl, W. Ruile, "Programmable Reflectors for SAW-ID-Tags", Siemens AG, Corporate Research and Development, Munich, Germany, 1993 Ultrasonics Symposium.

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