Substrate 24 serves as an electrical insulator and a thermal conductor and can be made of ceramic material such as, Alumina (Al2O3), Aluminum Nitride (AlN), sapphire, Silicon Carbide (SiC), diamond, or Berrylium Oxide (BeO); dielectric coated metal like aluminum copper or other alloys, semiconductor materials such as, GaAs or Si; or laminate-based or other substrates that use thermal vias or metal