Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-04-06
2010-06-01
Lee, Benny (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S196000
Reexamination Certificate
active
07728698
ABSTRACT:
A surface acoustic wave filter includes an acoustic track bounded by reflectors, at least a first input transducer and at least a second input transducer acoustically coupled to the acoustic track that are connected in parallel and connected to an asymmetric input port, at least two first output transducers acoustically coupled to the acoustic track that are connected in parallel and connected, to a first terminal of a symmetric output port and at least two second output transducers acoustically coupled to the acoustic track that are connected in parallel and connected to a second terminal of a symmetric output port. Each first output transducer in the acoustic track and corresponding second output transducers are side-by-side and are electrically connected in series via a first bus bar.
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International Search Report for PCT/EP2005/003624, Jul. 1, 2005.
Written Opinion for PCT/EP2005/003624, Jul. 1, 2005.
English translation of the Written Opinion for PCT/DE2005/003624, Jul. 1, 2005.
International Preliminary Report on Patentability in counterpart Application No. PCT/EP2005/003624, dated Nov. 14, 2006.
English Translation of International Preliminary Report on Patentability in counterpart Application No. PCT/EP2005/003624, dated Nov. 14, 2006.
EPCOS AG
Fish & Richardson P.C.
Lee Benny
Wong Alan
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