High frequency filter having saw and dielectric filters with dif

Details High frequency filter having saw and dielectric filters with dif High frequency filter having saw and dielectric filters with dif

1997-06-11

1999-04-13

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313B, 310315, 310346, 333206, H03H 964, H01P 1202

Patent

active

058942513

ABSTRACT:
36.degree. -rotated Y-cut X-propagation lithium niobate substrate (LiNbO.sub.3) was used as a piezoelectric substrate to compose a surface acoustic wave filter and is connected with a dielectric filter in series. The dielectric filter having a sign of the frequency temperature characteristic which is opposite to that of the surface acoustic wave filter was used. Accordingly, a high frequency filter, comprising a surface acoustic filter and a dielectric filter connected in series, which can secure sufficient attenuation without an increase in the insertion loss within the band can be provided.

REFERENCES:
patent: 4349794 (1982-09-01), Kagiwada et al.
patent: 4509165 (1985-04-01), Tamura
patent: 4672255 (1987-06-01), Suzuki et al.
patent: 5202652 (1993-04-01), Tabuchi et al.
patent: 5254962 (1993-10-01), Morris
patent: 5467065 (1995-11-01), Turunen et al.

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