Filter system comprising a bulk acoustic wave resonator

Details Filter system comprising a bulk acoustic wave resonator Filter system comprising a bulk acoustic wave resonator

2006-10-10

2006-10-10

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C310S321000, C310S335000, C333S189000, C333S133000

Reexamination Certificate

active

07119637

ABSTRACT:
The invention relates to a filter device equipped with at least one bulk acoustic wave resonator, which comprises a resonator unit and a reflection element (2) comprising several layers (6, 7, 8). The layers (6, 7, 8) each comprise a mixture of at least two materials. Within each layer (6, 7, 8), the composition of the mixture varies continuously and periodically relative to the layer thickness.

REFERENCES:
patent: 5373268 (1994-12-01), Dworsky et al.
patent: 5646583 (1997-07-01), Seabury et al.
patent: 6087198 (2000-07-01), Panasik
patent: 6975182 (2005-12-01), Loebl et al.

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