Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2003-12-16
2008-12-02
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S193000, C310S346000, C310S31300R, C310S31300R
Reexamination Certificate
active
07459991
ABSTRACT:
An apparatus including a piezoelectric substrate having at least one transducer electrode structure. The structure having a metallization formed by one or more metals with a mean specific density that is at least 50% higher than that of aluminum. The structure having a compensation layer that is applied fully or partially over the metallization. The compensation layer is of a material having a temperature dependence of elastic constants that counteracts the temperature coefficient of frequency of the substrate. The compensation layer has a thickness that is less than 15% of an acoustic wavelength of a wave capable of propagation in the structure.
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Hauser Markus
Knauer Ulrich
Leidl Anton
Roesler Ulrike
Ruile Werner
Epcos AG
Fish & Richardson P.C.
Pascal Robert
Wong Alan
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