Waveguide to plural microstrip transition

摘要

A waveguide to microstrip transition having a waveguide open at one end. A dielectric substrate includes a first and a second side and a ground plane covers the first side of the substrate. The dielectric substrate overlies the waveguide opening so that the ground plane faces the waveguide and an opening in the ground plane registers with the waveguide opening. A back short having a housing is positioned on the second side of the dielectric substrate. The back short housing forms a cavity which registers with at least a portion of the ground plane opening so that microwave energy from the waveguide passes through the dielectric substrate and into the cavity defined by the back short housing. The back short housing has at least one opening to the cavity along the second side of the dielectric substrate. A pair of spaced apart microstrips on the second side of the substrate each have a free end positioned in the cavity so that the free ends of the microstrips are spaced apart from each other.