Filter structure

Details Filter structure Filter structure

2007-07-24

2007-07-24

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S189000

Reexamination Certificate

active

10514587

ABSTRACT:
A filter structure, comprising a first signal line, a second signal line, a third signal line and a fourth signal line, said first and third signal lines defining an input port and said second and fourth signal lines defining an output port of a section of said filter structure, said section being defined by a first bulk acoustic wave resonator (A) which is connected between said first signal line and said second signal line, a second bulk acoustic wave resonator (G) which is connected between said third signal line and said fourth signal line, a third bulk acoustic wave resonator (C) which is connected between said first signal line and said fourth signal line, and a fourth bulk acoustic wave resonator (E) which is connected between said second signal line and said third signal line; is characterized in that a frequency pulling factor defined d of at least one of said acoustic wave resonators is non-zero, said frequency pulling factor d being defined by for first and second bulk acoustic wave resonators having a resonant frequency fr1, and for third and fourth bulk acoustic wave resonators having an anti-resonant frequency fa2, f0being the centre frequency of the filter structure and k the coupling factor of respective resonators.

REFERENCES:
patent: 5692279 (1997-12-01), Mang et al.
patent: 6542055 (2003-04-01), Frank et al.
patent: 6670866 (2003-12-01), Ella et al.
patent: 6870446 (2005-03-01), Ohara et al.
patent: 6990357 (2006-01-01), Ella et al.
patent: 1017170 (2000-07-01), None
patent: WO 2004/066495 (2004-08-01), None

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