Elastic surface acoustic wave filter device with balanced and un

Details Elastic surface acoustic wave filter device with balanced and un Elastic surface acoustic wave filter device with balanced and un

1997-10-07

1999-11-30

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313R, H03H 964

Patent

active

059949805

ABSTRACT:
An elastic surface acoustic wave filter device provides balanced operation with a neutral terminal kept at a ground potential and is adaptable for any system of unbalanced input-to-balanced output or balanced input-to-unbalanced output even with an input and an output having a different characteristic impedance. A first elastic surface acoustic wave filter having a first predetermined phase is connected in a cascade arrangement to a second elastic surface acoustic wave filter having a phase that is different by about 180 degrees from the first predetermined phase to form a first set of cascaded elastic surface acoustic wave filters. A third elastic surface acoustic wave filter having the first predetermined phase is connected in a cascade arrangement to a fourth elastic surface acoustic wave filter having the predetermined phase to form a second set of cascaded elastic surface acoustic wave filters. One of input/output terminals of the first set of cascaded elastic surface acoustic wave filters and one of input/output terminals of the second set of cascaded elastic surface acoustic wave filters are electrically connected in parallel to an unbalanced input/output terminal. The other of input/output terminals of the first set of cascaded elastic surface acoustic wave filters and the other of input/output terminals of the second set of cascaded elastic surface acoustic wave filters are electrically connected in series to balanced input/output terminals.

REFERENCES:
patent: 5475348 (1995-12-01), Hode et al.
patent: 5568002 (1996-10-01), Kawakatsu et al.
patent: 5581141 (1996-12-01), Yamada et al.
patent: 5790000 (1998-08-01), Dai et al.

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