Substrate and forming method thereof, elastic wave filtering device and forming method thereof

The invention discloses a substrate and a forming method thereof, and an elastic wave filtering device and a forming method thereof, the substrate comprises a first part and a second part located on the first part, the second part is internally provided with metal particles, and the resistivity of the second part is greater than that of the first part. The substrate is high in resistance value, stable in resistance value and easy to obtain, and can be applied to different resistance values in an elastic wave filtering device. 一种衬底及其形成方法、弹性波滤波装置及其形成方法，衬底包括：包括第一部和位于第一部上的第二部，所述第二部内具有金属粒子，所述第二部的电阻率大于所述第一部的电阻率。所述衬底阻值高且阻值稳定，易于获得，能够适用于在弹性波滤波装置中不同阻值的应用。