Multielement-type piezoelectric filter with through-hole connect

Details Multielement-type piezoelectric filter with through-hole connect Multielement-type piezoelectric filter with through-hole connect

Filed on

1998-06-09

Date issued

1999-07-06

Examiner

Pascal, Robert

Patent Class

Wave transmission lines and networks

SubClass

Coupling networks

SubSubClass

Electromechanical filter

Other Related Categories

310352, 174 523, 174262, 174264, 361777, 361792, H03H 960

Type

Patent

Status

active

Patent number

059202424

Description

ABSTRACT:
A multielement-type piezoelectric filter capable of facilitating assembly and having a reduced size. The base substrate carries a conduction circuit. An input terminal portion, an output terminal portion and a ground terminal portion are formed on a bottom surface of the base substrate and connected to corresponding connection end portions of the conduction circuit. Furthermore, series resonators and parallel resonators are arranged side by side on the base substrate. The lower electrodes of the resonators are connected to the corresponding connection end portions of the conduction circuit via through-holes. In one embodiment, conductive sheets are attached onto exposed upper electrodes of some of the resonators so as to establish a required connection between the upper electrodes. In another embodiment, a common path layer is formed on the upper surface of the base substrate. The upper electrodes of some of the resonators are connected to the common path layer via bonding wires. A cap is attached to the base substrate which covers the resonators.

REFERENCES:
patent: 4323865 (1982-04-01), Tanaka et al.
patent: 4639698 (1987-01-01), Nishiki
patent: 5438305 (1995-08-01), Hikita et al.
patent: 5565824 (1996-10-01), Nagano
patent: 5801603 (1998-09-01), Yamamoto et al.

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