Waveguide, method of manufacturing waveguide and antenna

A method of manufacturing a waveguide, comprising:

• forming, in a first conductor plate material, a groove portion that has a rectangular cross section such that a longitudinal direction of the groove portion becomes a first direction and the groove portion is parallel to a first main surface of the first conductor plate material;
• manufacturing a first conductor plate by forming, in the first conductor plate material, a vertical pipe portion extending in a second direction, which is orthogonal to the first direction and the first main surface, starting from a branch position in the groove portion;
• a step of manufacturing a second conductor plate by forming, in a second conductor plate material different from the first conductor plate material, a reflective portion having a reflective surface for reflecting a radio wave, propagated along the groove portion, toward the vertical tube portion, such that the reflective portion protrudes from a second main surface of the second conductor plate material in contact with the first main surface;
• and
• coupling the first conductor plate and the second conductor plate such that the first main surface and the second main surface are in contact with each other in a state where the reflective portion is inserted into the groove portion, after forming the first conductor plate and the second conductor plate.

An antenna comprising:

• an antenna element having an antenna port;
• and
• a waveguide connected to the antenna port, wherein
• the waveguide is a waveguide having a first conductor plate and a second conductor plate in contact with the first conductor plate,
• the first conductor plate includes:
• a groove portion that has a rectangular cross section and is formed parallel to a first main surface, which is a flat surface of the first conductor plate on the second conductor plate side, such that the longitudinal direction of the groove portion is a first direction;
• and
• a first vertical tube portion formed in a direction away from the second conductor plate in a second direction, which is orthogonal to the first direction and the first main surface, starting from a branch position in the groove portion;
• and
• the second conductor plate includes:
• a second vertical tube portion formed in the second direction between the antenna port and the groove portion;
• a reflective portion which is inserted into the groove portion in a manner to project from a second main surface, which is a flat surface of the second conductor plate in contact with the first main surface, and has a reflective surface which reflects a radio wave, propagated along the groove portion, toward the first vertical tube portion.