SAW (Surface Acoustic Wave) filter is a component that extracts electrical signals of a specific frequency band according to the regular cross shaped electrodes formed on the piezoelectric film or piezoelectric substrate. In order to transmit the surface elasticity between the piezoelectric motor plate and the bottom plate, it is necessary to pack the piezoelectric motor plate and the ceramic bottom plate into a vacuum state with an epoxy resin patch. In recent years, the chip size is becoming smaller and smaller, and the process is becoming more and more difficult.
