Patent ID: 6509874
Filing Date: 2003-01-21
Classification: H01Q

Abstract:
A millimeter wave radar system, comprising:a microstrip antenna array assembly comprising a plurality of conductive microstrips, a ground plane, and a dielectric substrate disposed between the plurality of conductive microstrips and the ground plane to form a corresponding plurality of microstrip transmission lines; and a metal plate having at least one channel formed in a surface thereof, the metal plate surface being coupled to the ground plane to form at least one waveguide, wherein the ground plane includes a plurality of apertures disposed relative to the waveguide and the respective microstrip transmission lines to form a corresponding plurality of waveguide-to-microstrip transmission line transitions, and wherein the microstrip antenna array assembly further includes a plurality of tuning stubs coupled to the respective conductive microstrips, the plurality of tuning stubs being in registration with the respective apertures and configured to provide reactive matching for the respective waveguide-to-microstrip transmission line transitions.