Band-pass filter using film bulk acoustic resonator

Details Band-pass filter using film bulk acoustic resonator Band-pass filter using film bulk acoustic resonator

2005-04-26

2005-04-26

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S191000

Reexamination Certificate

active

06885262

ABSTRACT:
A band-pass filter has a ladder-type circuit including first and second terminals whose characteristic impedances are Z0, and series elements and shunt elements disposed between a first terminal and a second terminal, each of the series elements and shunt elements containing a film bulk acoustic resonator. Assuming that characteristic impedance of any one of the series elements is Z1and that characteristic impedance of any one of the shunt elements is Z2, the characteristic impedances Z0, Z1, and Z2have a relation of 1<(Z1/Z0)<2, preferably 1.3<(Z1/Z0)<1.7, and 0.5<(Z2/Z0)<1, preferably 0.6<(Z2/Z0)<0.8.

REFERENCES:
patent: 6262637 (2001-07-01), Bradley et al.
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patent: 11-88111 (1999-03-01), None
patent: 2000-69594 (2000-03-01), None

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