Waveguide directional coupler and method of manufacturing waveguide directional coupler

摘要

The shape of the cross section perpendicular to the tube axis direction in the metamorphic waveguides (24a) to (24d) is a notch shape in which two diagonal corners in a square are cut out. In the notch shape, the first region where the length in the tube width direction is longer than the length in the tube height direction is the connecting waveguides (23a) to (23d) or the input / output waveguides (25a) to (25d) In the notch shape, the second region in which the length in the tube width direction is shorter than the length in the tube height direction is the input / output waveguide (25a) to (25d) or the connection waveguide ( 23a) to 23d).