Surface acoustic wave ladder filter having a parallel resonator

Details Surface acoustic wave ladder filter having a parallel resonator Surface acoustic wave ladder filter having a parallel resonator

1998-07-17

1999-12-07

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, H03H 964

Patent

active

059990694

ABSTRACT:
A surface acoustic wave filter has a ladder type filter circuit including a plurality of series arm resonators and a plurality of parallel arm resonators. The electrostatic capacitance of at least one of the parallel arm resonators is larger than that of another of the parallel arm resonators, and the length of a bonding wire connecting the parallel arm resonator having the larger electrostatic capacitance to a ground potential of a package is greater than that of a bonding wire connecting the another of the parallel arm resonators not having the larger electrostatic capacitance to the ground potential, such that the values of additional inductances created by the bonding wires are different from each other. In this manner, attenuation poles are distributed so that the amount of attenuation in the stop band on the low-frequency side is greatly increased.

REFERENCES:
patent: 5559481 (1996-09-01), Satoh et al.
patent: 5561406 (1996-10-01), Ikata et al.
patent: 5844453 (1998-12-01), Matsui et al.

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