Saw filter including electrodes of opposing polarity

Details Saw filter including electrodes of opposing polarity Saw filter including electrodes of opposing polarity

1995-04-24

1997-07-08

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313R, 310313D, H03H 900

Patent

active

056465840

ABSTRACT:
A SAW filter having an even number of tracks, each track comprising reflective input and output IDTs having a partially reflecting grating disposed between them. One of the IDTs of each pair of tracks has its electrodes connected in opposite polarity to those of the other IDTs of the pair of tracks and the separation of the input and output IDTs of respective tracks of each pair of tracks is substantially the same. The relative dispositions of the partially reflecting gratings are such that waves launched into respective tracks of a pair of tracks undergo at least one reflection from the partially reflecting grating prior to being coherently incident on the output IDTs. By virtue of the oppositely connected electrodes of one of the IDTs, direct coupling through the tracks is inhibited at substantially all frequencies.

REFERENCES:
patent: 4079342 (1978-03-01), Solie
patent: 4353043 (1982-10-01), Gunton
patent: 4591815 (1986-05-01), Schofield
patent: 4609891 (1986-09-01), Solie et al.
patent: 4679014 (1987-07-01), Bulst et al.
patent: 5128640 (1992-07-01), Anemogiannis
patent: 5296824 (1994-03-01), Cho et al.
patent: 5357228 (1994-10-01), Dufilie
patent: 5365206 (1994-11-01), Machui et al.
patent: 5379010 (1995-01-01), Ruile et al.

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