Abstract: Illumination assemblies include a substrate having a first and second electrically conductive layer separated by an electrically insulating layer. The insulating layer includes a polymer material loaded with thermally conductive particles. At least a portion of the thermally conductive particles simultaneously contact both the first and second electrically conductive layers. A plurality of light sources such as LEDs or other miniature light sources are preferably disposed on the first conductive layer.

Abstract: A dielectric composite material containing a toughened benzocyclobutene resin and at least about 50% by weight of an inorganic filler. Also electronic packages having at least one conductive layer and at least one layer of the dielectric composite material. The dielectric composite material can have a dielectric constant less than about 3.5, and a dielectric loss of less than about 0.004.

Abstract: A dielectric composite material containing a toughened benzocyclobutene resin and at least about 50% by weight of an inorganic filler. Also electronic packages having at least one conductive layer and at least one layer of the dielectric composite material. The dielectric composite material can have a dielectric constant less than about 3.5, and a dielectric loss of less than about 0.004.

Abstract: A passive electrical article includes a first electrically conductive substrate having a major surface and a second electrically conductive substrate having a major surface. The major surface of the second substrate faces the major surface of the first substrate. An electrically resistive layer is on at least one of the major surface of the first substrate and the major surface of the second substrate. An electrically insulative layer is between the first and second substrates and in contact with the electrically resistive layer. The insulative layer is a polymer having a thickness ranging from about 1 ?m to about 20 ?m. The insulative layer has a substantially constant thickness.