Electronic component and ladder filter

Details Electronic component and ladder filter Electronic component and ladder filter

1997-04-02

1999-08-17

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310348, 333189, H01L 4108

Patent

active

059398191

ABSTRACT:
A ladder filter has a piezoelectric resonator having reduced spurious vibrations and having a wider range of selection of the difference .DELTA.F between the resonant frequency and the antiresonant frequency, and has a substantially reduced size. The ladder filter includes an insulating substrate on which four pattern electrodes are provided. Four lands are respectively formed as portions of the four pattern electrodes. Another land is formed as a portion of the second pattern electrode. External electrodes of four piezoelectric resonators adapted to vibrate in a longitudinal vibration mode and capable of being mounted in a surface mount manner are connected to the land of the pattern electrodes by supporting members made of an electroconductive material. The four piezoelectric resonators are arranged in a row in the order of a first series resonator, a first parallel resonator, a second parallel resonator and a second series resonator.

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