Piezoelectric filter

Details Piezoelectric filter Piezoelectric filter

1984-07-25

1986-01-14

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310333, 310366, 333189, 333192, H03H 956, H03H 958

Patent

active

045648255

ABSTRACT:
A piezoelectric filter of the energy-trapped type which utilizes thickness shear mode is disclosed, wherein first and second resonator units are connected in a cascade manner. Each of the resonator units includes a piezoelectric plate which has a slit formed therein and a pair of front electrodes on the front thereof and a pair of back electrodes on the back thereof, with the slit lying between each pair of the electrodes. The pair of back electrodes of the second resonator unit are electrically connected to each other. The first and second resonator units are positioned so that the back electrodes of one of the two units face against those of the other, and then mechanically coupled together through the use of an electrically nonconductive adhesive. The back electrodes of the first and second resonator units are led commonly outwardly, while the pair of the front electrodes of the first resonator unit form an input electrode and an output electrode.

REFERENCES:
patent: 3321648 (1967-05-01), Kolm
patent: 3590287 (1971-06-01), Berlincourt et al.
patent: 3763446 (1973-10-01), Toyoshima et al.

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