Tokamak outer antenna

A Tokamak outer antenna, comprising feed waveguides, brims, sub-waveguides, and a metal base, wherein the metal base is in a W shape, both ends of the metal base are connected to lower surfaces of the feed waveguides, respectively;

• opposite sides of the two feed waveguides are connected to the brims, respectively;
• a plurality of sub-waveguides are arranged on an upper surface of the metal base at equal intervals;
• a height of each sub-waveguide is not higher than the height of the feed waveguide;
• and one feed waveguide serves as a microwave input port, and the other feed waveguide serves as a microwave output port;
• and
• wherein a bottom plate of the metal base is in an arch shape, two stepped surfaces are symmetrically arranged on the bottom plate, two ends of each stepped surface are planes, and vertical lengths of the sub-waveguides arranged on the bottom plate are the same and range from 0 mm to 100 mm.