H - Electricity – 03 – H
Patent
H - Electricity
03
H
349/48, 349/59.1
H03H 9/68 (2006.01) G01S 13/75 (2006.01) G01S 13/82 (2006.01) G06K 7/10 (2006.01) H03H 9/02 (2006.01) H03H 9/145 (2006.01) H03H 9/42 (2006.01) G01S 13/34 (2006.01)
Patent
CA 1228912
ABSTRACT A passive transponder for use in an interrogation/trans- ponder system comprises a substrate having a substrate surface defining a path of travel for surface acoustic waves; a launch transducer element arranged on the surface for converting interrogating signals into surface acoustic waves which propagate along the path of travel; a plurality of tap transducer elements arranged on the surface at spaced intervals along the path of travel for converting surface acoustic waves into respective output signals; and a cir- cuit, connected to the tap transducer elements, for combin- ing the output signals of these transducer elements to form reply signals. In order to control the delay time from transducer element to transducer element, one or more "delay pads" are provided on the substrate surface between these transducer elements.
465011
Smart & Biggar
X-Cyte Inc.
LandOfFree
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