Surface acoustic wave filter with optimized parallel and series

Details Surface acoustic wave filter with optimized parallel and series Surface acoustic wave filter with optimized parallel and series

1996-04-09

1998-02-17

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313A, 310313R, H03H 964

Patent

active

057195366

ABSTRACT:
In a resonator-type surface acoustic wave filter comprising a lithium tantalate substrate, lithium niobate substrate or lithium tetraborate substrate having a cut plane of high velocity, the direction of propagation of surface acoustic waves is set within the range of (40 deg to 90 deg, 40 deg to 90 deg, 0 deg to 60 deg) as expressed in Eulerian angles, and the capacitance Cos of the series resonators and the capacitance Cop of the parallel resonators are set within a predetermined range formulated with the center frequency taken as a parameter. Optimum ranges of the required design parameters are thus clarified to assure the resonator-type surface acoustic wave filter of higher performance.

REFERENCES:
patent: 4387355 (1983-06-01), Uno et al.
patent: 4672255 (1987-06-01), Suzuki et al.
patent: 4803449 (1989-02-01), Hikita et al.
patent: 5115216 (1992-05-01), Hikita et al.
patent: 5471178 (1995-11-01), Hickernell
patent: 5506552 (1996-04-01), Seki et al.
patent: 5559481 (1996-09-01), Satoh et al.

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