Saw filter comprising a broadband band-stop filter

Details Saw filter comprising a broadband band-stop filter Saw filter comprising a broadband band-stop filter

2011-01-25

2011-01-25

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000

Reexamination Certificate

active

07876179

ABSTRACT:
A band-stop filter is described herein. The band-stop filter includes a piezoelectric substrate and a plurality of surface wave element (SAW) impedance elements on the substrate. The band-stop filter also includes at least one series branch comprising at least one series resonator having a finger period, and a plurality of parallel branches connected electrically in parallel with the series branch, each parallel branch including at least one parallel impedance element comprising an interdigital transducer and having a finger period. The average finger period of the at least one series resonator is greater than the average finger period of the at least one parallel impedance element.

REFERENCES:
patent: 4126837 (1978-11-01), Koyamada et al.
patent: 4577168 (1986-03-01), Hartmann
patent: 4803449 (1989-02-01), Hikita et al.
patent: 4910481 (1990-03-01), Sasaki et al.
patent: 5854579 (1998-12-01), Penunuri
patent: 6326864 (2001-12-01), Takamine et al.
patent: 6570470 (2003-05-01), Maehara et al.
patent: 6710677 (2004-03-01), Beaudin et al.
patent: 6731185 (2004-05-01), Taniguchi
patent: 6862441 (2005-03-01), Ella
patent: 6879224 (2005-04-01), Frank
patent: 6924715 (2005-08-01), Beaudin et al.
patent: 7446629 (2008-11-01), Nakamura et al.
patent: 2003/0117240 (2003-06-01), Inoue et al.
patent: 2004/0090145 (2004-05-01), Bauer et al.
patent: 2004/0130411 (2004-07-01), Beaudin et al.
patent: 2004/0247153 (2004-12-01), Ruile et al.
patent: 2004/0248614 (2004-12-01), Ella
patent: 2008/0129418 (2008-06-01), Miura et al.
patent: 100 57 848 (2002-05-01), None
patent: 101 11 959 (2002-09-01), None
patent: 09-167937 (1997-06-01), None
patent: 10-065489 (1998-03-01), None
patent: WO03/069777 (2003-08-01), None
Machine Translation for DE 10057848 dated May 23, 2002.
English translation of the Written Opinion for PCT/DE2006/001798, Jan. 17, 2007.
International Search Report for PCT/DE2006/001798, Jan. 17, 2007.
Written Opinion for PCT/DE2006/001798, Jan. 17, 2007.
Caron et al., “Improved Rejection Band in SAW Ladder Filters Using High Frequency Shunt Element”, IEEE International Ultrasonics, Ferroelectrics, and Frequency Control Joint 50thanniversary Conference 2004.

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