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A low-profile transformer or inductor includes a leg of a magnetically permeable core. A tube-type winding arrangement is made by use of a flat, flexible dielectric sheet, on one side of which a broad conductive area is affixed, and on the other side of which a plurality of mutually parallel elongat

A low-profile transformer or inductor includes a leg of a magnetically permeable core. A tube-type winding arrangement is made by use of a flat, flexible dielectric sheet, on one side of which a broad conductive area is affixed, and on the other side of which a plurality of mutually parallel elongated regions are affixed. The dielectric sheet is rolled into a tube defining a parting line which is perpendicular to the axes of elongation of the conductive strips. The discontinuous elongated strips are formed into a continuous winding by means of stitches. The stitches may be through vias extending through overlapping regions of the tube to interconnect ends of the strip conductors, or may be generated by an HDI conductor overlying the ends of the strip conductors, with through vias making connections to the ends of the strip conductors and to HDI conductors.

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[ What is claimed is:] [1.] A magnetically coupled winding structure, comprising:a flat, magnetically permeable core including a flat first portion defining first and second broad sides and at least one peripheral edge, and also defining mutually parallel first and second slots extending inward from

[ What is claimed is:] [1.] A magnetically coupled winding structure, comprising:a flat, magnetically permeable core including a flat first portion defining first and second broad sides and at least one peripheral edge, and also defining mutually parallel first and second slots extending inward from said edge, to thereby define a central core portion lying generally between said first and second slots, and to also define first and second side core portions extending parallel with said central core portion, said magnetically permeable core further including a flat, magnetically permeable end portion coplanar with said first portion and magnetically coupled to said central core and to said first and second side core portions adjacent the ends of said slots;a dielectric sheet defining first and second broad, flat, mutually opposed sides, said dielectric sheet including a first electrically conductive layer affixed to at least a substantial portion of said first side, and further including a second layer affixed to said second side of said dielectric sheet, said second layer including a plurality of elongated second electrical conductors, each of said plurality of elongated second electrical conductors defining first and second ends, and an axis of elongation extending between said first and second ends, with said axes of elongation of said second electrical conductors being mutually parallel, said dielectric sheet being curved in a generally cylindrical manner to thereby define a structure having the general shape of a flat tube defining first and second ends and having said first side of said dielectric sheet on the inner side of said flat tube, said flat tube defining a central axis, and being dimensioned to fit over said central core portion with said first end of said tube adjacent the juncture of said central core portion and said side core portions, and with said second end of said tube adjacent said end portion of said core, so that said first electrically conductive layer is formed into an electrically open single turn about said central core, and so that each of said second electrical conductors also defines an open single turn about said central core, with a first end of each of said elongated second electrical conductors adjacent a second end thereof, said first and second ends of said second electrical conductors being substantially coplanar with one of said first and second broad sides of said magnetically permeable core when said tube is fitted over said central portion of said core;a flexible interconnection sheet overlying said one of said first and second sides of said magnetically permeable core and said first and second ends of said second elongated electrical conductors, said flexible interconnection sheet including a layer of electrically conductive material defining at least interconnections between said first and second ends of said elongated second electrical conductors, said interconnections being defined in a manner which electrically interconnects at least the first end of one of said elongated second electrical conductors to the second end of a nearby one of said elongated second electrical conductors, to thereby define a single continuous electrical conductor wound in multiple turns about said central core portion; andelectrically conductive means coupled to mutually adjacent portions of said electrically conductive first layer, to thereby define a single turn of electrical conductor about said central core portion of said magnetically permeable core.