Patent ID: 10159154

Abstract:
A method of making a multilayered, fusion bonded circuit structure. A first circuitry layer is attached to a first major surface of a first LCP substrate. A plurality of first recesses are formed that extend from a second major surface of the first substrate to the first circuitry layer. The first recesses are then plated to form a plurality of first conductive pillars of solid metal that substantially fill the first recesses. A plurality of second recesses are formed in a second LCP substrate corresponding to a plurality of the first conductive pillars. The second recess are plated to form a plurality of second conductive structures that extend between first and second major surfaces of the second substrate. The second major surface of the first substrate is positioned adjacent to the second major surface of the second substrate. The first conductive pillars are aligned with the second conductive structures. The stack is then fusion bonded to mechanically couple the first conductive pillars to the second conductive structures.