Surface acoustic wave filter with range of a frequency differenc

Details Surface acoustic wave filter with range of a frequency differenc Surface acoustic wave filter with range of a frequency differenc

1996-04-09

1998-02-17

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313A, 310313R, H03H 964

Patent

active

057195374

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 frequency difference .increment.f between the resonance frequency frs of series resonators and the resonance frequency frp of parallel resonators is set within a predetermined range formulated with the center frequency, the capacitance Cos of the series resonators and the capacitance Cop of the parallel resonators taken as parameters. 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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