Patent ID: 6990729
Filing Date: 2006-01-31
Classification: H01F,H01L,H05K,Y10T

Abstract:
1. A method for forming an inductor, comprising: forming a ceramic substrate by stacking a plurality of unfired ceramic layers forming in said ceramic substrate a first plurality of conductive vias radially spaced a first distance from a central axis so as to define an inner circumference; forming in said ceramic substrate a second plurality of conductive vias radially spaced a second distance about said central axis so as to define an outer circumference; forming a first plurality of conductive traces disposed in a first plane defined orthogonal to said central axis, said first plurality of conductive traces forming an electrical connection between substantially radially adjacent ones of said first and second plurality of conductive vias; forming a second plurality of conductive traces disposed in a second plane spaced from said first plane and defined orthogonal to said central axis to define an electrical connection between circumferentially offset ones of said first and second plurality of conductive vias to define a three dimensional toroidal coil; wherein at least a first one of said ceramic layers has a permeability greater than one over an area that includes said entire substrate, and at least a portion of said first one of said ceramic layers is contained within a toroid shaped core region of said ceramic substrate, defined within said toroidal coil.