Antenna device including reflector and primary radiator

An antenna device of a single beam scheme, comprising:

• a reflector configured to form an offset antenna with a portion of a rotational paraboloid being cut out;
• a sub-reflector configured to radiate a beam having an elliptical cone shape to an aperture plane of the reflector;
• and
• a primary radiator configured to radiate a beam having any shape to the sub-reflector,
• wherein a contour of the aperture plane of the reflector is formed along an isolux line of the beam having an elliptical cone shape radiated from the sub-reflector,
• wherein:
• when a contour formed in the aperture plane of the reflector along the isolux line of the beam having an elliptical cone shape radiated from the primary radiator is a first contour, and a virtual elliptical contour formed to be perpendicular to an axis of the beam incident on the aperture plane of the reflector is a second contour,
• a space in which the first contour protrudes from the second contour is a space which compensates for a loss due to spillover of the reflector.