Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1980-11-04
1982-10-05
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310313D, 333195, 333196, H03H 925, H03H 964, H03H 9145
Patent
active
043530460
ABSTRACT:
A surface wave device is disclosed which includes a substrate (12) having a piezoelectric surface (14), an acoustic surface wave transducer (16 and 18) for converting between an electrical signal and acoustic surface waves propagating on the piezoelectric surface and reflective structures (22) which cause reflections of acoustic surface waves in the portion of the piezoelectric surface over which the transducer is disposed. Numerous kinds of reflective structures are disclosed. An acoustic surface wave resonator using the present invention is disclosed, along with bandpass filters with multiple poles. A low-loss transversal filter using the present invention is also disclosed.
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patent: 4114119 (1978-09-01), Sandy et al.
patent: 4144507 (1979-03-01), Shreve
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Nussbaum Marvin L.
R F Monolithics, Inc.
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