Apparatus and method for an asymmetrical multi-pole monolithic c

Details Apparatus and method for an asymmetrical multi-pole monolithic c Apparatus and method for an asymmetrical multi-pole monolithic c

1996-03-13

1997-08-26

Lee, Benny T.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310320, 333192, H03H 9205

Patent

active

056614438

ABSTRACT:
A multi-pole monolithic crystal filter (100) having at least three asymmetrically acoustically coupled resonators (104) on a piezoelectric blank (102) to provide an improved phase response (302). The resonators (104) are positioned substantially in inverse proportion to predetermined ladder network coupling coefficients to achieve an improved phase response filter. The ladder network coupling coefficients are selected from designs including Bessel, Gaussian, linear phase and equiripple models. In this way, a predetermined improved phase response (302) is obtained monolithically without discrete interstage tuning components.

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"Proceedings of the 39th Annual Frequency Control Symposium of Frequency Control"; The Motorola Multi-Pole Monolithic Filter Project, 1985. Dworsky et al.
"Monolithic Crystal Filter Design Using a Variational Coupling Approximation"; IEEE Transactions on Sonics and Ultrasonics, vol. SU-28, No. 4, Jul. 1981, pp. 277-283. Dworsky, L.N.

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