Antenna apparatus and waveguide for use therewith

摘要

An antenna apparatus is provided with two parabolic antennas 18 and 19 which are attached to an X-axis and adapted to independently rotate about the X-axis. The X-axis is supported between both ends of a support rail 14 in the shape of a semicircular arc to pass through the center of the arc. The support rail is adapted to slide and is thereby permitted to rotate about the central axis of the arc as a Y-axis. The support rail is placed on a rotating base 13 adapted to rotate about a Z-axis. The entire apparatus is covered with a radome 20. Each of the parabolic antennas is therefore permitted to rotate about each of the X, Y and Z-axes. By controlling each axis driving mechanism according to the locations and orbits of two satellites, each of the parabolic antennas is permitted to track a respective one of the satellites. The use of the semicircular support rail having no physical central axis allows the antenna apparatus to be small in size. An antenna apparatus is therefore provided which is capable of tracking two satellites simultaneously which is so compact that it can be installed in relatively small space.