US Patent 7750763 Waveguide bend having a square shape cross-section

An improved 90° waveguide bend has the following features:the waveguide bend has two waveguide connectors located perpendicularly to each other,the waveguide connectors have a square internal cross section having an edge length (a),between the two waveguide connectors there is provided an angular portion producing the 90° change in direction,the angular portion has externally to the 90° change in direction a chamfer as a delimiting wall for the waveguide bend, the waveguide channel being outwardly delimited by the chamfer, andthe chamfer has in the plane of curvature a length corresponding to the edge length (a) of the waveguide connectors which are square in cross section, ±less than 0.5%.