SAW TRANSPONDER

A passive transponder for use in an interrogation/transponder system comprises a substrate having a substrate surface 86 defining a path of travel for surface acoustic waves; at least one transducer element arranged on the surface for converting between electrical energy and surface acoustic wave en...

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Bibliographische Detailangaben
Hauptverfasser:	PAUL ANTON NYSEN, HALVOR SKEIE
Format:	Patent
Sprache:	eng
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR ANALOGOUS ARRANGEMENTS USING OTHER WAVES ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDEDFOR ELSEWHERE BASIC ELECTRONIC CIRCUITRY CALCULATING CHECKING-DEVICES COMPUTING COUNTING DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY GENERATING RANDOM NUMBERS HANDLING RECORD CARRIERS IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS PHYSICS PRESENTATION OF DATA RADIO DIRECTION-FINDING RADIO NAVIGATION RECOGNITION OF DATA RECORD CARRIERS REGISTERING OR INDICATING THE WORKING OF MACHINES RESONATORS SOUND-PRODUCING DEVICES TESTING TIME OR ATTENDANCE REGISTERS TRANSMISSION VOTING OR LOTTERY APPARATUS
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Beschreibung
Zusammenfassung:	A passive transponder for use in an interrogation/transponder system comprises a substrate having a substrate surface 86 defining a path of travel for surface acoustic waves; at least one transducer element arranged on the surface for converting between electrical energy and surface acoustic wave energy which propagates along the path of travel; and a circuit, connected to the transducer element(s), for supplying interrogating signals to the transducer element(s) and for receiving reply signals therefrom. In order to minimize insertion losses in the substrate, acoustic wave reflectors 88, 90 are provided to reflect the surface acoustic waves back towards the transducer element(s).