Selective dielectric resin application on circuitized core layers
A layup for multiple-layer printed circuit board manufacturing is formed according to a process that includes selectively applying a dielectric resin to a high resin demand region of a circuitized core layer without applying the dielectric resin to another region of the circuitized core layer. The process also includes partially curing the dielectric resin within the high resin demand region. The process further includes forming a layup that includes a layer of pre-impregnated (prepreg) material adjacent to the partially cured dielectric resin within the high resin demand region of the circuitized core layer.
1. A multiple-layer printed circuit board comprising:
a dielectric layer formed from a pre-impregnated (prepreg) material that includes a partially cured dielectric resin encapsulating a woven glass cloth; and
a circuitized core layer having a surface that is adjacent to the dielectric layer, the surface of the circuitized core layer having a high resin demand region of dielectric material with glass spheres encapsulated within a cured dielectric resin and another region of dielectric material without the glass spheres.
2. The multiple-layer printed circuit board of claim 1 , wherein the high resin demand region of dielectric material has a first dielectric constant that is substantially similar to a second dielectric constant associated with the dielectric layer that is adjacent to the surface of the circuitized core layer.