Acoustic wave filter with double reflective gratings and method

Details Acoustic wave filter with double reflective gratings and method Acoustic wave filter with double reflective gratings and method

1996-11-26

1998-06-02

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313D, H03H 925, H03H 964

Patent

active

057606641

ABSTRACT:
An acoustic wave resonator is provided on a substrate of 45.degree. X-cut, Z-propagating lithium tetraborate. The resonator includes an inner and an outer set of reflective gratings. The inner set of reflective gratings is separated from the transducer of the resonator by a set of first gaps having a synchronous coupling value of n.lambda./2. The outer set of reflective gratings is separated from the inner set of reflective gratings by a set of second gaps having a peak coupling value of (4m+1).lambda./8. This configuration of the resonator produces a wide bandwidth frequency response substantially free of spurious frequency modes and having a good shape factor.

REFERENCES:
patent: 4672255 (1987-06-01), Suzuki et al.
patent: 5296824 (1994-03-01), Cho et al.
patent: 5351022 (1994-09-01), Ruile et al.
patent: 5561408 (1996-10-01), Yamamoto et al.

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