Patent ID: 8723616

Claim:
A waveguide-microstrip line converter, comprising: a waveguide; a dielectric substrate that is connected to cover one end of the waveguide; a strip conductor that is disposed on an end of one surface of the dielectric substrate; a conductor plate that is disposed substantially in a center of the one surface of the dielectric substrate, and connected to the strip conductor; a ground conductor that is disposed on another surface of the dielectric substrate except for a connection region of the waveguide and the dielectric substrate; and a plurality of connection conductors that connect a periphery of the conductor plate and the ground conductor except for a portion that connects the strip conductor and the conductor plate, wherein the ground conductor has an opening formed therein in the connection region of the waveguide and the dielectric substrate, wherein the conductor plate is disposed to cover the opening through intermediation of the dielectric substrate, wherein the strip conductor and the ground conductor form a microstrip line, and wherein the plurality of connection conductors are arranged so that a distance between two of the plurality of connection conductors, which are aligned in a longitudinal direction of the microstrip line and are disposed near opposite sides of the conductor plate in the periphery and in a vicinity of the connection portion of the strip conductor and the conductor plate, is less than a distance between another two of the plurality of connection conductors, which are aligned in the longitudinal direction of the microstrip line and are disposed near opposite sides of the conductor plate in the periphery and in a vicinity of the opening.