Method for realizing surface acoustic wave filter...

Details Method for realizing surface acoustic wave filter... Method for realizing surface acoustic wave filter...

2007-07-31

2007-07-31

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000

Reexamination Certificate

active

10499589

ABSTRACT:
The invention relates to a method for realizing surface acoustic wave filter arrangements of the kind comprising a piezo-electric substrate and on said substrate metallic strip elements constituting impedance filter elements arranged in a network scheme. In such an arrangement by electrostatic interaction between the network elements is produced a parasitic resonance at a frequency different from the operational resonance frequency. The method is characterized in that means are provided in the filter arrangement which produce a shifting of the parasitic resonance frequency to a frequency substantially equal to said operational resonance frequency. The invention can be used for filter arrangements.

REFERENCES:
patent: 4999535 (1991-03-01), Mariani et al.
patent: 6072377 (2000-06-01), Tajima et al.
patent: 0795958 (1997-09-01), None
patent: 1037385 (2000-09-01), None
patent: 06-152317 (1994-05-01), None

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