Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1985-10-16
1986-09-02
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333194, 333196, 310313D, H03H 964
Patent
active
046098917
ABSTRACT:
A surface acoustical wave (SAW) filter is provided by placing at least one pair resonator channels consisting of reflectors and input and output transducers on the surface of a suitable substrate, such as a piezo-electric crystal. One channel of the pair consists of an input transducer and an output transducer which are aligned in a path along which the SAW progresses. The two channels are identical except that the separation distance between the transducers and the reflectors, in one channel is slightly different than the corresponding distance in the other channel. This separation difference serves to broaden the passband for applications which require a broader passband than is obtainable with a single channel resonator filter. Differential detection of the SAW in one section with respect to the other channel is achieved by using a symetrically inverted output transducer, in one embodiment. In another embodiment an offset transducer is used to accomplish the differential sensing.
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Fredricksen Hans P.
Solie Leland P.
Bowen Glenn W.
Nussbaum Marvin L.
Sperry Corporation
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