Patent ID: 8607445
Filing Date: 2013-12-17
Classification: H01G,H05K,Y10T

Abstract:
1. A method of making a circuitized substrate including at least one internal capacitor, said method comprising: providing a first, single dielectric layer depositionally processed in a single step; providing a capacitive dielectric layer on said first, single dielectric layer, said capacitive dielectric layer containing nano-particles of a ferroelectric ceramic material dispersed in a polymer matrix and having a thickness less than 2500 microns; forming at least two pairs of spaced-apart, longitudinal, planar channels by a subtractive process, said at least two pairs of spaced-apart, longitudinal, planar channels extending up to the thickness of said capacitive dielectric layer, said at least two pairs of spaced-apart, longitudinal, planar channels having parallel side walls within said capacitive dielectric layer; depositing electrically conductive material in a single step within each of said at least two pairs of spaced-apart longitudinal, planar channels, forming at least two parallel plates of electrically-conductive channels; and providing a second single dielectric layer over said electrically conductive material to form said circuitized substrate having at least one internal capacitor, said internal capacitor having as a thickness a distance between said at least two parallel plates of electrically-conductive channels of said capacitive dielectric layer, a total capacitance of said internal capacitor within a unit area increasing with decreasing dimensions between said at least two parallel plates of electrically-conductive channels and spaces of said capacitive dielectric therebetween, and the total capacitance of said internal capacitor within said unit area increasing as the thickness of the capacitive dielectric layer increases in accordance with the parameters: where D=dielectric layer thickness L=number of channels−1 C C n=total number of capacitors per unit volume l=length of capacitor (in mils) C1=capacitance per unit volume (mil C C1 is constant for a given material C1=0.000025 ££ £=dielectric constant for a given material £