Abstract
The excitation of shear elastic waves by an interdigital transducer operated at its surface-wave center frequency is discussed. It is shown experimentally for the high-coupling orientation of LiNbO3 that the shear-wave power radiated by an interdigital transducer may be an appreciable part of the input electrical power even at the surface-wave center frequency. The mode conversion of surface waves to shear waves at a receiving transducer is also considered. It is shown that the shear-wave radiation pattern of an electrically driven interdigital transducer is well described by treating the transducer as a phased-array antenna.
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