Elastic surface waves

NOV 01, 1972

The slow speed and short wavelength of Rayleigh waves enable devices for processing radar, television and radio signals to be much smaller than their electromagnetic equivalents.

DOI: 10.1063/1.3071091

John de Klerk

Devices that exploit the properties of elastic surface waves can perform very complex signal‐processing functions, identical to those carried out by conventional electromagnetic devices. The great advantage to using surface waves instead of electromagnetic waves is the tremendous reduction in size of surface‐wave devices compared to their electromagnetic counterparts. This great reduction in size is the result of the great difference between the elastic and electromagnetic velocities. Surface waves propagate at velocities approximately $10^{5} times$ slower than electromagnetic velocities; thus, at the same frequency, the elastic wavelength is $10^{5} times$ shorter than the electromagnetic wavelength. A further advantage is that the energy in the elastic surface wave can readily be sensed anywhere along its path.

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More about the authors

John de Klerk, Westinghouse Research Laboratories, Pittsburgh, Pennsylvania.