Surface acoustic wave resonator filter with longitudinally coupl

Details Surface acoustic wave resonator filter with longitudinally coupl Surface acoustic wave resonator filter with longitudinally coupl

1997-08-27

1999-06-01

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, H03H 964

Patent

active

059091584

ABSTRACT:
A surface acoustic wave resonator filter has a wide bandwidth, a low insertion loss characteristic and a sharp attenuation characteristic at edges of the passband. The surface acoustic wave resonator filter includes first and second longitudinally coupled resonator filters disposed on a piezoelectric substrate. The first and second longitudinally coupled resonator filters each have first, second, and third resonance modes. The phases of the output signals of the first and second longitudinally coupled resonator filters are opposite to each other for an input signal at frequencies higher than the passband. The difference in frequency between the first resonance mode of the first longitudinally coupled resonator filter and the first resonance mode of the second longitudinally coupled resonator filter is smaller than the difference in frequency between the first resonance mode and any other resonance modes in the first and second longitudinally coupled resonator filters. The difference in frequency between the third resonance mode of the first longitudinally coupled resonator filter and the third resonance mode of the second longitudinally coupled resonator filter is smaller than the difference in frequency between the third resonance mode and any other resonance modes in the first and second longitudinally coupled resonator filters.

REFERENCES:
patent: 5559483 (1996-09-01), Kajihara et al.
patent: 5592040 (1997-01-01), Yamamoto
patent: 5646584 (1997-07-01), Kondratyev et al.
patent: 5666092 (1997-09-01), Yamamoto et al.

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