Patent ID: 6172412
Filing Date: 2001-01-09
Classification: H01L

Abstract:
A microelectronic package for encasing high-frequency microelectronic circuits, comprising:a base having a top and a bottom, at least a portion of each of the top and the bottom of the base being conductive;an RF substrate attached to the top of the base, the RF substrate having an upper surface and a first cavity aligned with a conductive portion of the top of the base, the first cavity for retaining the microelectronic circuit therein;a plurality of conductive patterns formed on the upper surface of the RF substrate for providing electrical connections between an interior and an exterior of the package;a seal ring formed from a dielectric material attached to the upper surface of the RF substrate, the seal ring having a second cavity larger than the first cavity and having varied outer dimensions so that the plurality of conductive patterns on each of the interior and the exterior of the package are at least partially exposed, the seal ring defining a microstrip transition at a transition point where the plurality of conductive patterns passes from the interior to the exterior of the package; anda lid attached to the seal ring, wherein the lid is electrically isolated from the RF substrate and the base.