.~ Delay lines including elastic surface wave propagation means {5}
151
.~.~ Spurious signal or mode cancellation means
DEFINITION
Classification: 333/151
Spurious signal or mode cancellation means:
(under subclass 150) Subject matter including structure to reduce the effects of spurious mechanical or electric wave signals or modes on the output signal of the delay line.
(1) Note. Spurious modes or signals may result from reflections of elastic surface waves, undesired conversion of surface wave modes to bulk wave modes, nonlinearity of the means for transmitting surface waves, or from undesired capacitive coupling.
(2) Note. The mode cancellation means may include acoustic absorbers, shielding electrodes, obstacles in the surface acoustic wave path, or surface wave propagation substrates having anisotropic propagation properties.
