Antenna feed and antenna including the antenna feed

An antenna, comprising:

• an antenna feed;
• and
• a main reflection surface, wherein the main reflection surface includes a curved surface, and the antenna feed is positioned at the curved surface of the main reflection surface;
• wherein the antenna feed comprises:
• a waveguide, configured to electrically connect a signal to be transmitted;
• a medium support block, a first end of the medium support block being connected to the waveguide, and a second end of the medium support block having a concave inner surface, the inner surface monotonically progresses inward toward a bottom in an axial direction as the inner surface extends radially from a periphery toward the longitudinal axis;
• and
• a reflective surface configured to contact the inner surface,
• wherein:
• in a longitudinal cross-section of the medium support block, the inner surface has at least a first wall segment, a second wall segment, and a third wall segment at one side of the longitudinal axis,
• a distance of the second wall segment to the longitudinal axis is greater than a distance of the third wall segment to the longitudinal axis and is smaller than a distance of the first wall segment to the longitudinal axis, the third wall segment is connected to the second wall segment at one end of the second wall segment, the first wall segment is connected to the second wall segment at an other end of the second wall segment, and
• a first angle is defined between the first wall segment and the longitudinal axis, a second angle is defined between the second wall segment and the longitudinal axis, a third angle is defined between the third wall segment and the longitudinal axis, and the second angle is greater than the first angle and greater than the third angle.