Surface wave delay line with antireflective electrodes

Details Surface wave delay line with antireflective electrodes Surface wave delay line with antireflective electrodes

H - Electricity

03

H

333/36, 349/59.1

H03H 9/42 (2006.01) H03H 9/02 (2006.01)

Patent

CA 1300255

DOCKET R4303.01 EAO:kaf SURFACE WAVE DEVICE WITH ANTIREFLECTIVE ELECTRODES ABSTRACT OF THE DISCLOSURE A surface wave acoustic delay line is formed of a set of electrode assemblies disposed on the surface of a block of crystalline material propagative of a surface acoustic wave. In each of the assemblies, the electrodes are arranged in an interdigitated pattern. Reflected waves are cancelled by the construction of an additional electrode in each of an electrode assembly, the additional electrode extending only one-half the distance of the other electrodes and being spaced from an adjacent electrode by one-quarter wavelength. This introduces a 180° phase shift between portions of reflected waves which then cancel to remove the reflection. Also, in the case of closely spaced electrode assemblies, additional electrodes, equal in shape and size to the electrodes of the assemblies, are introduced between the assemblies in the form of a grid which propagates surface waves without reflection. -1-

554719

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