New method of the change of TCD of acoustic waves in structure containing piezoelectric plate

The new method of significant reducing the temperature coefficient of delay (TCD) for acoustoelectronic devices based on thin piezoelectric plates was suggested. On the example of the SH₀ waves propagating in the structure "plate YX lithium niobate - vacuum gap -semi-infinite dielectric medium" the change of the output signal phase as function of the medium permittivity and value of vacuum gap was analyzed. It has been found that with increase of the permittivity of material moving away from the plate surface the value of gap providing zero value of TCD decreases. The construction of the thermo-stable device was developed. The thermo-stability is achieved by changing the gap between the plate and dielectric material in accordance with the certain law at the change of the temperature. In a whole the obtained results open the prospect of the use of acoustic waves in thin piezoelectric plates for development of high sensitive and thermo-stable acoustoelectronic devices.