Patent ID: 6607934
Filing Date: 2003-08-19
Classification: B81C,H01H,H01L,H03H

Abstract:
A method for fabricating a multi-frequency passive communication integrated circuit comprising the steps of:(A) constructing a first set of electrical components on a first substrate by a micro-electromechanical process, said micro-electromechanical process including the steps of: (i) depositing at least one layer of material by sputtering, thermal vapor, or electron beam, wherein each layer is deposited at a temperature less than 450Â° C; (ii) curing at least one layer of a polyimide material, wherein each polyimide layer is cured at a temperature between 250Â° C. and 400Â° C.; (iii) applying at least one copper layer by direct electroplating; (iv) planarizing said at least one copper layer as deposited in step (iii) by chemical mechanical polishing, wherein each copper layer is planarized at a temperature of less than 150Â° C.; and (iv) applying at least one ceramic layer by plasma-enhanced chemical vapor deposition, wherein each ceramic layer is applied at a temperature of between 300Â° C and 400Â° C; (B) constructing a second set of electrical components on a second substrate; (C) forming in said second substrate at least one via hole and a plurality of cavities; (D) depositing a metal layer on an inner surface of each of said plurality of cavities; (E) adjoining said first substrate and said second substrate such that said first set of electrical components is positioned within said plurality of cavities; and (F) electrically coupling a circuit constructed from said second set of electrical components to a circuit constructed from said first set of electrical components through said at least one via hole.