Patent ID: 8169274

Claim:
A transmission line converter, comprising: a rectangular waveguide; a slot provided in a wall surface of the rectangular waveguide; and a transmission line which extends in a direction of a tube axis of the rectangular waveguide and includes a signal conductor and a ground conductor, wherein the slot is provided in the wall surface with a narrowest width, of the rectangular waveguide, has a shape in which a central portion of the slot includes an oblique portion to the tube axis of the rectangular waveguide, and at least one end portion of the oblique portion includes a portion parallel to the tube axis of the rectangular waveguide, wherein the wall surface of the rectangular waveguide in which the slot is provided is a part of the ground conductor, wherein the transmission line includes one end that is open-circuited at a position which is separated by approximately ¼ times a propagation wavelength in the transmission line from the slot.