Resonator filter cascade

Details Resonator filter cascade Resonator filter cascade

2005-02-22

2005-02-22

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000, C310S31300R

Reexamination Certificate

active

06859117

ABSTRACT:
A resonator filter cascade has resonator structures disposed adjacent to one another and form a waveguide for acoustic surface waves, and coupling transducers. The present invention changes resonator filter cascades so that the insertion attenuation is reduced by decreasing the attenuation of cascading, without using a coupling coil. A resonator filter cascade has resonator structures having coupling transducers which transversely couple resonator filters and the coupling transducers, belonging the same transversely coupled resonator filter, are not connected with one another. Coupling transducers of different transversely coupled resonator filters are each connected with one another over a pair of electrically conducting connections.

REFERENCES:
patent: 5581141 (1996-12-01), Yamada et al.
patent: 5936487 (1999-08-01), Solal et al.
patent: 6043726 (2000-03-01), Solal et al.
patent: 6384698 (2002-05-01), Hayashi et al.
patent: 42 27 362 (1994-02-01), None
patent: 44 21 665 (1996-01-01), None
patent: 44 39 489 (1996-01-01), None
B. Wall et al.; “Balanced Driven Transversely Coupled Waveguide Resonator Filters”; Processings, IEEE 1996 Ultrasonics Symposium; vol. 1, pp. 47-51, Nov. 3-6, 1996.

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