Antenna apparatus

An antenna apparatus, comprising:

• a parabolic reflector;
• a dielectric support pedestal having a corrugated structure;
• a sub-reflector connected to an upper part of the dielectric support pedestal, the sub-reflector having a step-like structure along a lower side of the sub-reflector and a planar structure along an upper side of the sub-reflector;
• a waveguide connected to a lower part of the dielectric support pedestal, wherein the parabolic reflector has a curved surface in which a ratio of a focal length to a diameter is greater than a preset value, and
• a plurality of separable corrugations configured to suppress a cross polarization is formed in a region of the dielectric support pedestal,
• wherein a direction in which at least one corrugation protrudes from the dielectric support pedestal is parallel to a longitudinal of the waveguide,
• wherein the plurality of separable corrugations are coupled to the upper part of the dielectric support pedestal,
• the dielectric support pedestal includes a plurality of mounting areas corresponding to a shape of the plurality of separable corrugations, respectively, and
• the plurality of separable corrugations are mounted on the dielectric support pedestal through the plurality of separable mounting areas, respectively.