Integrated filter including FBAR and saw resonator and...

Details Integrated filter including FBAR and saw resonator and... Integrated filter including FBAR and saw resonator and...

2006-06-08

2008-10-21

Chang, Daniel D (Department: 2819)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S187000

Reexamination Certificate

active

07439825

ABSTRACT:
An integrated filter including a film bulk acoustic resonator (FBAR) and a surface acoustic wave (SAW) resonator and a method of fabricating the integrated filter. The integrated filter includes: a substrate; a first electrode positioned in a predetermined first area on an upper surface of the substrate; a first piezoelectric layer positioned on the first electrode; a second electrode positioned on the first piezoelectric layer; a second piezoelectric layer positioned in a predetermined second area on the upper surface of the substrate; and at least one inter-digital transducer (IDT) electrode positioned on the second piezoelectric layer. The IDT electrode includes: a first IDT electrode formed in a comb structure on the second piezoelectric layer; and a second IDT electrode formed in a comb structure on the second piezoelectric layer so as to mesh with the first IDT electrode. The first and second piezoelectric layers are formed of an identical material. Thus, an integrated filter which operates in various frequency bands can be made compact.

REFERENCES:
patent: 6710681 (2004-03-01), Figueredo et al.
patent: 7053730 (2006-05-01), Park et al.
patent: 7233219 (2007-06-01), Inoue et al.

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