Ladder-type bulk acoustic wave filter with common ground...

Details Ladder-type bulk acoustic wave filter with common ground... Ladder-type bulk acoustic wave filter with common ground...

2006-05-09

2006-05-09

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S189000

Reexamination Certificate

active

07042312

ABSTRACT:
A ladder-type bulk acoustic wave filter includes an input terminal, an output terminal, a ground terminal, a plurality of series resonators connected in series between the input terminal and the output terminal, a plurality of shunt resonators, and a common ground inductor. Each shunt resonator has a first end and a second end. Each of the first ends of the shunt resonators is connected to a contact point of the series resonators. The second ends of the shunt resonators are commonly connected to a common terminal. The common ground inductor connects the common terminal of the shunt resonators to the ground terminal.

REFERENCES:
patent: 5231327 (1993-07-01), Ketcham
patent: 6323744 (2001-11-01), Barber et al.
patent: 2003/0186673 (2003-10-01), Kimachi et al.
patent: 2005/0093648 (2005-05-01), Inoue
patent: 10-093382 (1998-04-01), None
C.W. Seabury et al., “Thin Film ZnO Based Bulk Acoustic Mode Filters”, IEEE 1997 Microwave Symposium Digest, Jun. 1997, vol. 1, pp. 181-184.

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