Patent ID: 7274269

Claim:
A waveguide-transmission line converter comprising: a waveguide having a hollow shape with a hollow space defined therein; a dielectric substrate disposed on an open end of said waveguide; a strip line disposed on a surface of said dielectric substrate remote from said waveguide and extending inwardly from an outer side of said waveguide toward an opposite outer side of said waveguide; a ground metal layer disposed on a surface of said dielectric substrate remote from said surface thereof on which said stripline is disposed, said ground metal layer extending along an outer edge of said dielectric substrate; and a matching element disposed on said surface of said dielectric substrate on which said ground metal layer is disposed, said matching element being spaced inwardly from said ground metal layer away from said outer edge of said dielectric substrate; said dielectric substrate being mounted on said open end of said waveguide with said ground metal layer interposed therebetween, whereby said waveguide-transmission line converter is able to convert electromagnetic energy transmitted by said waveguide and electromagnetic energy transmitted by said stripline into each other; wherein said waveguide has a beveled inner corner of a side wall thereof at the open end of the waveguide, and said hollow space is greater in size at said beveled inner corner than another portion of the side wall of the waveguide.