Patent ID: 7078816

Claim:
A circuitized substrate comprising: a first dielectric layer including an epoxy resin material and a filler comprised of particles having a size within the range of from about 200 Angstroms to about 35 microns, said particles comprising from about 10 percent to about 80 percent by volume of said first dielectric layer, said first dielectric layer not including continuous fibers, semi-continuous fibers or the like as part thereof, said first dielectric layer including a plurality of conductive thru-holes therein having a pattern density of from about 5,000 to about 10,000 holes per square inch of said first dielectric layer, said first dielectric layer having a dielectric constant within the range of from about 3.5 to about 4.0; and at least one circuitized layer positioned on said first dielectric layer.