Ladder filter with piezoelectric resonators each having a plural

Details Ladder filter with piezoelectric resonators each having a plural Ladder filter with piezoelectric resonators each having a plural

1997-04-30

1998-10-20

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310328, 310348, 310359, 310366, H03H 915, H03H 958, H03H 910

Patent

active

058252622

ABSTRACT:
A ladder type filter achieves a substantial reduction in distortion in filtering characteristics. The ladder type filter includes a supporting substrate formed of an insulating material. Supporting members are attached to lands which are formed by portions of pattern electrodes disposed on the supporting substrate. A plurality of piezoelectric resonators are mounted on the supporting members and connected in a ladder arrangement to define a ladder type filter. Each piezoelectric resonator has a base member in which piezoelectric layers and internal electrodes are laminated. External electrodes formed on one side surface of the base member are connected to the internal electrodes disposed in the base member. The width w and the thickness t of the piezoelectric resonators and the number n of laminated layers each comprising one of the piezoelectric layers and one of the internal electrodes disposed adjacent to the corresponding piezoelectric layer are selected so as to satisfy 1.ltoreq.log.sub.10 (n.sup.2 wt).ltoreq.3.

REFERENCES:
patent: 4503352 (1985-03-01), Inoue
patent: 4759107 (1988-07-01), Ogawa et al.
patent: 5381067 (1995-01-01), Greenstein et al.

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