Surface acoustic wave filter of multi-stage connection type

Details Surface acoustic wave filter of multi-stage connection type Surface acoustic wave filter of multi-stage connection type

1998-03-13

1999-12-07

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313B, 310313D, H03H 925, H03H 964

Patent

active

059990686

ABSTRACT:
A surface acoustic wave filter of multi-stage connection type including a plurality of surface acoustic wave filters formed on a piezoelectric substrate and a connection section for electrically connecting the surface acoustic wave filters in a cascade connection. Each of the surface acoustic wave filters includes interdigital transducers with two signal terminals for electric input and output, each interdigital transducer including an excitation section for exciting a surface acoustic wave and two terminal sections disposed on opposite sides of the excitation section, the two terminal sections serving as input or output terminal for electric signal and ground terminal. One of the signal terminal sections is connected to the connection section, and an electrode area of said one of the signal terminal sections is adjusted so that a parasitic capacitance formed between said one of the signal terminal sections and a grounding point of the surface acoustic wave filter is less than or equal to 0.01 pF.

REFERENCES:
patent: 4999535 (1991-03-01), Mariani et al.
patent: 5581141 (1996-12-01), Yamada et al.
patent: 5793266 (1998-08-01), Allen et al.

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