Surface acoustic wave passive transponder having amplitude and p

Details Surface acoustic wave passive transponder having amplitude and p Surface acoustic wave passive transponder having amplitude and p

1983-06-30

1986-11-25

Tubbesing, T. H.

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

Radar transponder only

310313B, 333152, 333196, G01S 1380, H03H 968, H03H 9145

Patent

active

046252070

ABSTRACT:
A passive transponder for use in an interrogation/transponder 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 circuit, connected to the tap transducer elements, for combining 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.

REFERENCES:
patent: 3273146 (1966-09-01), Hurowitz, Jr.
patent: 3706094 (1972-12-01), Cole et al.
patent: 3755803 (1973-08-01), Cole et al.
patent: 4058217 (1977-11-01), Vaughan et al.
patent: 4059831 (1977-11-01), Epstein
patent: 4143340 (1979-03-01), Hunsinger
patent: 4217564 (1980-08-01), Avtran
patent: 4263595 (1981-04-01), Vogel

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