Patent ID: 8329492

Claim:
A method for fabricating a MEMS resonator, comprising: forming a stacked main body comprising a silicon substrate, a plurality of metallic layers and at least an isolation layer, wherein the metallic layers are formed above the silicon substrate, the stacked main body has at least a first etching channel extending from the metallic layers into the silicon substrate, the isolation layer is filled in the first etching channel, and the stacked main body has a predetermined suspended portion; removing a portion of the isolation layer so that at least a second etching channel is formed to expose the silicon substrate and a remained portion of the isolation layer covers an inner sidewall of the first etching channel; and applying an isotropic etching process to the silicon substrate through the second etching channel and by employing the remained isolation layer covering the inner sidewall of the first etching channel as a mask so that the portion of the silicon substrate under the predetermined suspended portion is removed, thereby forming a hollow region inside the silicon substrate.