Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1983-06-30
1986-08-12
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
333154, 310313B, G01S 1380, H03H 942, H01L 4104
Patent
active
046059296
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 maximize energy conversion from the interrogation signals to the reply signals, the launch transducer is made larger than the tap transducers.
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Barron Jr. Gilberto
Milde Jr. Karl F.
Tubbesing T. H.
X-Cyte Inc.
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