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AssigneeX-Cyte, Inc.
InventorsHalvor Skeie, Donald Armstrong
Estimating the term…
A "passive interrogator label system" (PILS) is disclosed with passive, SAW transponders which are capable of receiving an interrogation signal, processing this signal and transmitting a reply signal that is derived from the interrogation signal and contains encoded information. The SAW transducers employed in the transponders are operated at their third harmonic and comprise split fingers which reduce SAW reflections. These transducers are also shaped to increase their bandwidth and to reduce their capacitance. The bus bars connecting the transducers are formed of double thickness to reduce ohmic resistance losses and these bus bars as well as the transponder phase delay pads have two levels of serrations on their edges to substantially cancel reflections. SAW reflectors in the transponder are provided with shorts between successive fingers to reduce ohmic resistance losses and to render them less susceptible to fabrication errors.
In an interrogation system having means for producing an interrogating signal in a prescribed frequency range and a passive transponder for transmitting a reply signal containing encoded information in response to the receipt of said interrogating signal, said transponder comprising:
Dependencies are inferred from the claim text.