Surface acoustic wave passive transponder having parallel acoust

Details Surface acoustic wave passive transponder having parallel acoust Surface acoustic wave passive transponder having parallel acoust

1983-06-30

1986-10-28

Tubbesing, T. H.

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

Radar transponder system

Radar transponder only

310313B, 333154, 333196, G01S 1380, H03H 921, H03H 9205

Patent

active

046201912

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 reduce the effect of spurious signals, the tap transducers are arranged both in series and in parallel with respect to the path of travel.

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: 3801935 (1974-04-01), Mitchell
patent: 4058217 (1977-11-01), Vaughan et al.
patent: 4059831 (1977-11-01), Epstein
patent: 4263595 (1981-04-01), Vogel
patent: 4494031 (1985-01-01), Barnes et al.

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