ACOUSTIC WAVE FILTER - FUJITSU LTD

Title:

ACOUSTIC WAVE FILTER

Document Type and Number:

WIPO Patent Application WO/1996/015587

Kind Code:

A1

Abstract:

In an acoustic wave filter constituted by arranging resonators having resonance characteristics or antiresonance characteristics in a ladder form, the resonator on the parallel arm in the first stage on the input side has a large flowing-in current and its service life is shortened due to the heat generated from its thin-film wiring. In order to prevent the shortening of the service life of the resonator, bonding wires (33, 31) are bonded to connecting electrodes (130, 131) for connecting one end of each of comb-teeth-like electrodes constituting the resonator or bonded to lead-out conductor (130-1) extended in the longitudinal direction of the connecting electrodes at positions on both sides of the center line C1 of the comb-teeth-like electrodes. The wires (33 and 31) may be bonded on the center line C1, but it is preferable to bond the wires (33 and 31) symmetrically with respect to the center line C1. It is preferably that the lengths of the comb-teeth-like electrodes are larger than the widths of the electrodes.

Inventors:

NISHIHARA TOKIHIRO (JP)
SATOH YOSHIO (JP)
UCHISHIBA HIDEMA (JP)
MATSUDA TAKASHI (JP)
IKATA OSAMU (JP)

Application Number:

PCT/JP1995/002293

Publication Date:

May 23, 1996

Filing Date:

November 10, 1995

Export Citation:

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Assignee:

FUJITSU LTD (JP)
NISHIHARA TOKIHIRO (JP)
SATOH YOSHIO (JP)
UCHISHIBA HIDEMA (JP)
MATSUDA TAKASHI (JP)
IKATA OSAMU (JP)

International Classes:

H03H9/145; H03H9/64; H03H9/02; (IPC1-7): H03H9/64; H03H9/145

Foreign References:

JPH0423444B2	1992-04-22
JPH06188673A	1994-07-08
JPS5657526U	1981-05-18
JPH03229507A	1991-10-11
JPS62142409A	1987-06-25

Other References: