Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-06-21
2005-06-21
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S191000, C310S312000, C310S322000, C310S363000
Reexamination Certificate
active
06909340
ABSTRACT:
The invention relates to bulk acoustic wave filters including at least two bulk acoustic wave resonators. Each of these resonators includes at least one first electrode, a piezoelectric layer, and a second electrode. At least two of the bulk acoustic wave resonators have effective resonator surfaces which differ in their surface form and/or surface content. The inventive design of the bulk acoustic wave resonators enables optimal suppression of interference modes without influencing the impedance level of the filter.
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Aigner Robert
Elbrecht Lüder
Marksteiner Stephan
Nessler Winfried
Greenberg Laurence A.
Locher Ralph E.
Stemer Werner H.
Summons Barbara
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