Title :
Directivity of group-type single phase unidirectional SAW transducers
fDate :
7/19/1990 12:00:00 AM
Abstract :
It is shown that the centre-frequency directivity for a SPUDT comprising conventional transducers alternating with reflecting gratings is determined simply by the grating reflection coefficient. This applies if the transducers and gratings are varied to weight the device. If the grating strips are all identical the directivity is proportional to the total number of grating strips.
Keywords :
surface acoustic wave devices; ultrasonic transducers; SPUDT; centre-frequency directivity; grating reflection coefficient; grating strips; group-type single phase unidirectional SAW transducers; reflecting gratings;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19900777
