Piezoelectric resonator and piezoelectric filter

Details Piezoelectric resonator and piezoelectric filter Piezoelectric resonator and piezoelectric filter

1993-09-20

1995-03-21

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310357, 310367, 333188, 333189, H03H 915

Patent

active

054000017

ABSTRACT:
In a piezoelectric resonator having a piezoelectric bar formed in a substantial rectangular parallelopiped and electrodes formed on a pair of confronting surfaces of the piezoelectric bar for resonating in the length expander mode, the piezoelectric bar has at least a bevel portion extending the longitudinal direction. In a ladder filter having series and parallel piezoelectric resonators, the series piezoelectric resonator has the bevel portion to shift a frequency of a spurious response to that of the parallel piezoelectric resonator to suppress the spurious response. It is disclosed that a second piezoelectric resonator has a piezoelectric bar formed in a rectangular parallelopiped has a length L, a width W, and a thickness T wherein L>W>T; and electrodes formed on a pair of confronting surfaces defined by L and T. Another ladder filter includes the second piezoelectric resonator as the series resonator to decrease a capacitance between the electrodes to increase an amount of attenuation. In the second piezoelectric resonator, when W<T and 0.42<T/L<2.5, a coupling factor is large.

REFERENCES:
patent: 3694676 (1972-09-01), De Vries
patent: 4379247 (1983-04-01), Mattuschka
patent: 4398162 (1983-08-01), Nagai

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