Piezoelectric thin-film filter

Details Piezoelectric thin-film filter Piezoelectric thin-film filter

2007-11-01

2008-08-19

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S189000

Reexamination Certificate

active

07414497

ABSTRACT:
Providing is a piezoelectric thin-film filter including resonators connected in a lattice pattern, which can achieve large attenuation at frequencies away from a passband and improve steepness near two ends of the passband without involving an additional special step. Second resonators C—2or first and third resonators C—1and Cx—1connected in parallel form series-arm resonators or parallel-arm resonators C—1connected in a lattice pattern. The capacitance of each second resonator C—2is larger than the capacitance of each first resonator C—1. The capacitance of each third resonator Cx—1is substantially equal to the difference between the capacitance of the second resonator C—2and the capacitance of the first resonator C—1. The resonant frequency of the first resonator C—1higher than the resonant frequency of the second resonator C—2. The anti-resonant frequency of the third resonator Cx—1is higher than the resonant frequency of the second resonator C—2and lower than the resonant frequency of the first resonator C—1.

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International Search Report PCT/JP2006/311629 dated Sep. 4, 2006.
Written Opinion PCT/JP2006/311629 dated Sep. 4, 2006.

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