Surface acoustic wave passive transponder having non-reflective

Details Surface acoustic wave passive transponder having non-reflective Surface acoustic wave passive transponder having non-reflective

1983-06-30

1986-08-05

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

310313B, 333151, G01S 1374

Patent

active

046046232

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 minimize reflections from the edges of the transducer elements, these elements are configured with serrated edges facing the path of travel.

REFERENCES:
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patent: 3706094 (1972-12-01), Cole et al.
patent: 3755803 (1973-08-01), Cole et al.
patent: 3810257 (1974-05-01), Jones et al.
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patent: 4143340 (1979-03-01), Hunsinger
patent: 4201964 (1980-05-01), Noro et al.
patent: 4263595 (1981-04-01), Vogel
patent: 4267534 (1981-05-01), Tanski

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