Abstract: A printed circuit board with at least one cavity produced by combining a dielectric core layer with an adhesive layer. The adhesive layer is a no-flow bond film without a corresponding window. Thus the bond film also act as the base of the cavity. According to one feature of the invention, a top core layer having a window is laid on top of the bond film. Since the bond film does not have a window, the tedious step of registering different windows is completely eliminated. According to a further feature of the invention, the thickness of the top core layer from where the cavity will be derived is adjusted to thicker than or the same as the depth of the cavity in the final printed circuit board.

Abstract: A printed circuit board with a solid metallic interconnect which gives a stable and effective electrical interconnection between metallic layers separated by one or more dielectric layers. The method of producing the interconnect includes creating the solid metallic interconnect by metallic plating on the base copper at the interconnecting location, followed by the lamination of the appropriate dielectric layer. This dielectric layer may have a pre-cut hole corresponding to the solid metallic interconnect, which is registered with the interconnect before lamination. A layer of dielectric polymer is then removed from the interconnect by traditional methods. This is followed by electroplating and conventional metallization and circuitry formation. This process may also be applied to create an interconnect spanning more than one dielectric layer.