Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-05-24
2005-05-24
Le, Dinh T. (Department: 2816)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S191000, C310S328000, C310S366000
Reexamination Certificate
active
06897744
ABSTRACT:
A longitudinally-coupled multi-mode piezoelectric bulk wave filter using the piezoelectric longitudinal effect includes a plurality of excitation electrodes extending substantially parallel to each other, a laminated piezoelectric body including a plurality of piezoelectric layers arranged between the excitation electrodes and polarized in a predetermined direction, an input electrode and output electrode disposed on a first side surface of the laminated piezoelectric body, and a ground electrode disposed on a second side surface of the laminated piezoelectric body. When an input signal is applied between the input electrode and the ground electrode, vibration modes of different orders of harmonic waves are excited and coupled so that an output signal is output between the output terminal and the ground terminal. Let T represent the dimension of the width between the opposed first and second side surfaces of the laminated piezoelectric body and D represent the distance between the adjacent excitation electrodes, and T/D is equal to or smaller than about 0.9. As a result, a longitudinally-coupled multi-mode piezoelectric bulk wave filter presenting a large out-of-band attenuation is provided.
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patent: 6201337 (2001-03-01), Kaida et al.
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patent: AA 5-327401 (1993-12-01), None
Inoue Jiro
Kaida Hiroaki
Mitani Akihiro
Nishimura Toshio
Keating & Bennett
Le Dinh T.
Murata Manufacturing Co. Ltd.
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