Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1982-06-07
1984-08-28
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310313D, 333194, 333195, 333196, H03H 964, H03H 9145
Patent
active
044686420
ABSTRACT:
A band pass filter device has transducers comprised of thin metal stripes or slits formed on a surface of a piezoelectric plate for propagation of acoustic waves. The device comprises first and second band pass filters at least one of which is made unidirectional. The first band pass filter includes a first acousto-electric transducer and electro-acoustic transducers disposed on opposite sides of the first acousto-electric transducer and connected in common to an input signal source, and the second band pass filter includes a second electro-acoustic transducer connected electrically to the first acousto-electric and second acousto-electric transducers disposed on opposite sides of the second electro-acoustic transducer and connected in common to an output terminal, whereby a frequency characteristic can be obtained wherein loss is reduced in a pass band and increased in a stop band, and rising at the boundary between the pass band and stop band is made sharp. The small-sized band pass filter device having the above frequency characteristic is used for communication apparatus at VHF or UHF.
REFERENCES:
patent: 3859608 (1975-01-01), Hartmann et al.
patent: 4044321 (1977-08-01), Vasile
patent: 4063202 (1977-12-01), Vasile
patent: 4143343 (1979-03-01), Inoue et al.
patent: 4298849 (1981-11-01), Arneson
Hitachi , Ltd.
Nussbaum Marvin L.
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