Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-01-04
2005-01-04
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S187000, C310S321000
Reexamination Certificate
active
06838956
ABSTRACT:
A filter assembly includes a ceramic substrate. A die including a film bulk acoustic resonator receive-band filter, positioned on the ceramic substrate, having an input and an output, includes a plurality of film bulk acoustic resonators. The filter assembly includes a first and a second loop of current. The first loop includes a first wire bond connected to the input of the die, and a second wire bond connected to a first one of the plurality of film bulk acoustic resonators. The second loop includes a third wire bond connected to the output of the die, and a fourth wire bond connected to a second one of the plurality of film bulk acoustic resonators, wherein the first loop induces parasitic current in the second loop. The first and the second wire bonds are positioned proximate to one another to minimize the area of the first loop, and the third and the fourth wire bonds are positioned proximate to one another to minimize the area of the second loop.
REFERENCES:
patent: 4112147 (1978-09-01), Thompson
patent: 5162822 (1992-11-01), Wakamori
patent: 6262637 (2001-07-01), Bradley et al.
patent: 6377137 (2002-04-01), Ruby
patent: 10-178327 (1998-06-01), None
Agilent Technologies , Inc
Pascal Robert
Takaoka Dean
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