Surface acoustic wave device with proximity coupling and...

Details Surface acoustic wave device with proximity coupling and... Surface acoustic wave device with proximity coupling and...

G - Physics

10

K

G10K 11/36 (2006.01) H03H 9/00 (2006.01) H03H 9/02 (2006.01) H03H 9/64 (2006.01)

Patent

CA 2235058

The invention concerns a surface acoustic wave device with proximity coupled acoustic channels with differential inputs or outputs. The device consists of a whole number N, at least equal to 2, of acoustic channels (1, 2). The acoustic channels (1, 2) are proximity coupled. A first acoustic channel (1) comprises at least one transducer divided into several parts (5, 6) electrically connected to one another in parallel to form a first differential port (E+) and a second differential port (E-). The polarities of the various parts (5, 6) of the transducer being chosen so that the first differential port (E+) and second differential port (E-) are electrically symmetrical. Application in particular to surface acoustic wave filters for portable telephones. Figure 1.

L'invention concerne les dispositifs à ondes acoustiques de surface à voies acoustiques à couplage par proximité à entrées ou sorties différentielles. Le dispositif est composé d'un nombre entier N, au moins égal à 2, de voies acoustiques (1,2). Les voies acoustiques (1, 2) sont couplées entre elles par proximité. Une première voie acoustique (1) comprend au moins un transducteur séparé en plusieurs parties (5, 6) connectées électriquement en parallèle entre elles pour former un premier port (E+) et un deuxième (E-) port différentiels. Les polarités des différentes parties (5,6) du transducteur étant choisies pour que le premier (E+) et le deuxième (E-) ports différentiels soient électriquement symétriques. Application, en particulier, aux filtres à ondes acoustiques de surface pour téléphone portatif. Figure 1.

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