Abstract The system comprises a substrate capable of propagating acoustic surface waves. Disposed near opposite ends of the substrate are an input transducer that responds to an input signal for launching acoustic surface waves and an output transducer that responds to those waves for developing an output signal which is fed to a load. Extending lengthwise down the center of the wavepropagating surface is an acoustic wave guide that concentrates acoustic surface waves along a propagation path between the two transducers. Each of the transducers includes a pair of interleaved combs of conductive electrodes coupled piezoelectrically to the substrate. Adjacent teeth in the combs are spaced apart by one-half the acoustic wavelength and are curved concavely toward the adjacent end of the strip.
In an acoustic-wave transmitting system having a medium for propagating acoustic waves along a surface thereof and further having a wave guide extending between input and output portions of said medium for concentrating acoustic waves into a predetermined propagation path to minimize spreading of said waves across said surface, the improvement which comprises: a pair of surface wave interaction devices disposed across said path and coupled to said input and output portions of said medium to respond to surface waves propagated through said guide, at least one which devices is comprised of a pair of interleaved arrays of curvilinear concentric electrode elements defining a C-shaped structure facing its associated end of said wave guide.
Claim 2
Dependent Claim
114 words
In an acoustic-wave transmitting system having a medium for propagating acoustic waves along a surface thereof and further having a wave guide extending between input and output portions of said medium for concentrating acoustic waves into a predetermined propagation path to minimize spreading of said waves across said surface, the improvement which comprises: a pair of surface wave interaction devices disposed across said path and coupled to said input and output portions of said medium to respond to surface waves propagated through said guide, at least one which devices is comprised of a pair of interleaved arrays of curvilinear concentric electrode elements defining a C-shaped structure facing its associated end of said wave guide.
Claim 3
Dependent Claim
33 words
A system in accordance with claim 1 in which said wave guide has curvilinear terminating portions and in which said C-shaped structure is concentric with the adjacent terminating portion of said wave guide.
Claim 4
Dependent Claim
28 words
A system in accordance with claim 2 in which both of said interaction devices are C-shaped structures disposed concentrically with the associated terminating portion of said wave guide.