Multipole resonator

Details Multipole resonator Multipole resonator

1977-01-14

1979-05-22

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

29 2535, 310320, 310366, H03H 904, H03H 926, H03H 932, H01L 4122

Patent

active

041562143

ABSTRACT:
Three electrode pairs are formed on a monolithic piezoelectric element which exhibits anisotropic properties with respect to its X and Z axes. The electrodes of each pair are located on opposite sides of the piezoelectric element, with all electrodes being of predetermined dimensions. The first and second electrode pairs are aligned on the X axes at a predetermined spacing therebetween. The second and third electrode pair are aligned on the Z axis, also at a predetermined spacing.
In circuit operation, a signal to be processed is coupled to the first electrode pair and extracted from the third electrode pair, with the electrodes of the second pair shorted together. In this manner, the resonator displays a three pole passband characteristic having excellent spur suppression.

REFERENCES:
patent: 3487318 (1969-12-01), Herman
patent: 3582836 (1971-06-01), Kent
patent: 3602844 (1971-08-01), Sykes
Mason et al., "Physical Acoustics," vol. 1, Part A, Academic Press, New York and London, 1964; Title Page and pp. 365-367.

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