Acoustic surface wave device having split-isolated or...

Details Acoustic surface wave device having split-isolated or... Acoustic surface wave device having split-isolated or...

H - Electricity

03

H

333/79

H03H 7/01 (2006.01) H03H 9/02 (2006.01) H03H 9/76 (2006.01)

Patent

CA 1075781

ABSTRACT OF THE DISCLOSURE An acoustic surface wave filter has offset transmitting and receiving transducers formed on a wave propagating surface of a piezoelectric substrate. A multistrip coupler interposed between the transducers on the propagating surface includes a plurality of identical conductor groups forming coupler elements uniformly spaced on the surface and selectively attenuates either of the symmetrical or anti-symmetrical mode components of coupled waves within a predetermined range of acoustic wavelengths. In one embodiment, each conductor group includes electrically connected pairs which attenuates the symmetrical mode component while in another embodiment each conductor group includes a first continuous filamentary conductor and a second filamentary conductor having a discontinuity at its approximate center which attenuates the anti-symmetrical mode component. - 1 -

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