Surface acoustic-wave resonator filter having shifted resonant f

Details Surface acoustic-wave resonator filter having shifted resonant f Surface acoustic-wave resonator filter having shifted resonant f

1996-08-27

1997-12-16

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313R, 310313D, H03H 964

Patent

active

056990286

ABSTRACT:
A surface acoustic-wave resonator filter having improved group delay time characteristics. The filter comprises three energy-confined acoustic-wave resonator filter sections formed on a piezoelectric substrate. The second resonator filter section is positioned between the first and third resonator filter sections. One frequency in a vertical higher-order mode of the second filter section is placed on the lower-frequency side of one frequency in a vertical higher-order mode of the first and third filter sections. Or, one frequency in a vertical lower-order mode of the second filter section is placed on the higher-frequency side of one frequency in a vertical lower-order mode of the first and third filter sections.

REFERENCES:
patent: 5223762 (1993-06-01), Masaie et al.

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