Patent ID: 7453393

Claim:
A coupler mechanism for coupling a coaxial waveguide with a circular waveguide having a TE11 waveguide mode of operation, said coupler mechanism comprising: a coaxial waveguide port for receiving said coaxial waveguide, said coaxial waveguide having a coaxial waveguide impedance; a port for coupling said circular waveguide, said circular waveguide having a circular waveguide impedance; an impedance transformer; a matching waveguide; and a body member, said body member having a stepped section, said stepped section receiving said impedance transformer; said matching waveguide being coupled to said coaxial waveguide port, said matching waveguide having an impedance matching the impedance of said coaxial waveguide and said matching waveguide further comprising a rounded rectangular waveguide having a quasi-TE10 waveguide mode of operation; said impedance transformer having a first port for receiving said matching waveguide, a second port for said circular waveguide and a transition section, said transition section having one or more waveguide transitions and serving to match the impedance of said circular waveguide with the impedance of said matching waveguide; and said stepped section in said body member having one or more steps corresponding to said waveguide transitions.