Abstract

The paper deals with the effect,of the surface electrical boundary condition on the temperature stability of an SAW device. The temperature coefficient of delay (TCD) was characterised, both theoretically and experimentally, for SAW and LSAW propagating under electrically open and shorted periodic metal strips, and for those propagating on free and metallised surfaces. The result showed that for some crystals and/or cuts, this sort of surface electrical boundary condition markedly affects the temperature stability of a device. It was also shown that the temperature stability can be controlled by using electrically loaded IDT-type grating strips.

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