Patent ID: 7067397

Claim:
A method for fabricating wafer-level packages containing MMIC (monolithic microwave integrated circuit) components and MEMS (micro electromechanical systems) components, the method comprising the steps of: providing a substrate wafer having a front face and a back face, and providing a cover wafer of comparable size to the substrate wafer; fabricating multiple MMIC and MEMS components on the front face of the substrate wafer; forming a first set of seal rings around selected device areas on the front face of the substrate wafer; forming a second set of seal rings on a surface of the cover wafer, in positions corresponding the first set of seal rings; bonding the first and second sets of seal rings to provide a double-wafer structure that includes multiple device cavities formed between the substrate wafer and the cover wafer; thinning the substrate wafer by removing material from the back face; and completing MMIC and MEMS fabrication on the back face of the substrate wafer; whereby integration of MMIC and MEMS components provides enhanced circuit performance for each fabricated device.