Patent ID: 7479841
Filing Date: 2009-01-20
Classification: H01P

Abstract:
1. An MMIC chip comprising: a planar substrate having a first surface and a second surface; a conductive layer having a ground plane opening on said first surface; a transmission line on said second surface; at least one conductor extending from said conductive layer to said second surface defining a waveguide around said opening, said transmission line being connected to said at least one conductor, wherein a projection of said opening defines a waveguide opening defined by a plurality of vias formed in the MMIC chip, leaving a gap for said transmission line to cross an edge of said waveguide opening, wherein the plurality of vias are plated with a conductive material, and wherein the transmission line is connected to one of the plurality of plated vias located opposite the gap; and a second substrate including a second substrate waveguide and a thermal spreader having a dielectric insert aligned with the second substrate waveguide, wherein the ground plane opening is aligned with the substrate waveguide by aligning the opening with the dielectric insert, and wherein the planar substrate is attached to the second substrate.