Abstract
A single-phase unidirectional interdigital transducer SPUDT is modelled by a system of periodic metal strips on a piezoelectric halfspace carrying Bleustein-Gulyaev BG wave. The dispersion relation for BG surface wave, as well as some relations between forward and backward waves in the system are discussed. Natural unidirectionality is explained in this way.References
[1] P.V. WRIGHT, The natural single-phase unidirectional transducer, a new low-loss SAW transducer, Ultras. Symp. Proc., 59-63 (1985).
[2] E. DANICKI, Propagation of transverse surface acoustic waves in rotated Y-cut quartz substrates under heavy periodic metal electrodes, IEEE Trans., SU-30, 5, 304-312 (1983).
[3] C.S. HARTMANN, P. V. WRIGHT, R. J. KANSY, E. M. GARBER, An analysis of SAW interdigital transducer with internal reflections and the application to the design of single-phase unidirectional transducers. Ultras. Symp. Proc., 40-45, (1982).
[2] E. DANICKI, Propagation of transverse surface acoustic waves in rotated Y-cut quartz substrates under heavy periodic metal electrodes, IEEE Trans., SU-30, 5, 304-312 (1983).
[3] C.S. HARTMANN, P. V. WRIGHT, R. J. KANSY, E. M. GARBER, An analysis of SAW interdigital transducer with internal reflections and the application to the design of single-phase unidirectional transducers. Ultras. Symp. Proc., 40-45, (1982).
