Abstract: A printed circuit board having foamed substrates of low dielectric constant and low dissipation factor and techniques for making printed circuit boards and printed circuits using such substrates. The substrate has a dielectric constant less than 1.5 and a dissipation factor less than 10.sup.-2, most preferably, polymethylacrylimide. A conductive layer is placed on the substrate surface using chemical deposition or by use of appropriate adhesives. The printed circuit may be imprinted by conventional techniques such as etching with appropriate etching materials.