Ladder-type piezoelectric filter

Details Ladder-type piezoelectric filter Ladder-type piezoelectric filter

1993-07-06

1994-09-27

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310357, H03H 958

Patent

active

053510216

ABSTRACT:
In a ladder-type piezoelectric filter having a series arm constituted by a plurality of series resonators connected in series and parallel arms respectively constituted by parallel resonators, each of the resonators being constructed using a piezoelectric plate, the direction of polarization of the piezoelectric plate of the series resonator arranged in at least one end of the series arm and the direction of polarization of the piezoelectric plate of the parallel resonator connected to the series resonator arranged in at least one end of the series arm are the same as seen from the side of a node of the series resonator arranged in the end and the parallel resonator connected to the series resonator.

REFERENCES:
patent: 4837533 (1989-06-01), Oshikawa

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