Abstract: Disclosed is a Bragg mirror, a resonator and a filter device comprised thereof. The Bragg mirror comprises a stack of plurality of layers arranged in an axial direction, wherein the plurality of layers comprises at least one first layer comprising, in a radial direction, a first material and a second material, wherein the first material is a first metal and the second material is a different material with respect to the first material, and wherein the first material is radially embedded by the second material in the first layer, or vice versa. The resonator comprises a top electrode, a bottom electrode, a piezo electric layer arranged between the top electrode and the bottom electrode, a substrate, and a Bragg mirror arranged between the bottom electrode and the substrate.

Abstract: Disclosed is a Bragg mirror, a resonator and a filter device comprised thereof. The Bragg mirror comprises a stack of plurality of layers arranged in an axial direction (A), wherein the plurality of layers comprises at least one first layer (L1) comprising, in a radial direction (r), a first material (M1) and a second material (M2), wherein the first material (M1) is a first metal and the second material (M2) is a different material with respect to the first material (M1), and wherein the first material (M1) is radially embedded by the second material (M2) in the first layer (L1), or vice versa. The resonator comprises a top electrode, a bottom electrode, a piezo electric layer arranged between the top electrode and the bottom electrode, a substrate, and a Bragg mirror arranged between the bottom electrode and the substrate.

Abstract: Embodiments of this application provide a filter and a method for adjusting performance of a filter, so as to quickly adjust performance of a filter. The filter includes at least two acoustic wave resonators; and a performance adjustment structure, connected to an output end of a first acoustic wave resonator and an input end of a second acoustic wave resonator, where the first acoustic wave resonator and the second acoustic wave resonator are any two of the at least two acoustic wave resonators, the performance adjustment structure includes a capacitor structure and/or an inductor structure, and the performance adjustment structure is configured to adjust an energy coupling mode between the first acoustic wave resonator and the second acoustic wave resonator.