Waveguide device, and antenna device including the waveguide device

A waveguide device comprising:

• a first electrical conductor including an electrically conductive surface including a planar surface or a curved surface;
• a second electrically conductor including a plurality of electrically conductive rods arrayed thereon, each of the plurality of electrically conductive rods including a leading end opposing the electrically conductive surface of the first electrical conductor;
• and
• a waveguide including an electrically conductive waveguide surface opposing the electrically conductive surface of the first electrical conductor, the waveguide being disposed among the plurality of electrically conductive rods and extending along the electrically conductive surface;
• wherein
• the electrically conductive surface of the first electrical conductor includes a portion which protrudes toward the waveguide;
• and
• the electrically conductive surface of the first electrically conductor includes portions that respectively protrude toward the plurality of electrically conductive rods.