Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2008-08-28
2010-10-26
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C310S31300R
Reexamination Certificate
active
07821360
ABSTRACT:
A multi-channel surface acoustic wave (SAW) filter includes a voltage controlled velocity tunable piezoelectric substrate, an input transducer fabricated on the substrate, and an output transducer fabricated on the substrate. The input transducer further includes multiple input sub-transducers that are electrically and physically connected in parallel. The output transducer further includes multiple output sub-transducers that are electrically and physically connected in parallel. Corresponding pairs of input sub-transducers and output sub-transducers form multiple parallel channels for SAW propagation. The input transducer produces a voltage controlled tunable COMB frequency response that is combined with a voltage controlled tunable COMB frequency response produced by the output transducer to produce a SAW filter voltage controlled tunable frequency response. Further embodiments include a multi-channel SAW resonator, a SAW filter device connecting two novel SAW filters in series, and a SAW filter device connecting two novel SAW resonators in series.
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Jung Thomas
Kong Alvin
Yip David
Northrop Grumman Systems Corporation
Posz Law Group , PLC
Summons Barbara
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