Multiband antenna feeder for satellite communications organized waveguide

A feeding apparatus of a satellite communication multi-band antenna having a waveguide structure is provided to efficiently use a limited satellite communication channel by performing a communication with a plurality of satellites using a different frequency band with only one antenna. A feeding apparatus of a satellite communication multi-band antenna having a waveguide structure includes a common port(101), a straight line port(102), a side port(103), a connector(104), a partition(105), a coupling slot(106), and an iris(107). The common port of a circular waveguide shape passes a vertical/horizontal polarized wave signal of a Ku-band, and cuts off a vertical/horizontal polarized signal of an X-band. The straight line port of a spherical waveguide shape passes a vertical polarized signal of the Ku-band, and cuts off the horizontal polarized signal of the Ku-band. The side port passes the horizontal polarized signal of the Ku-band, and cuts off the vertical polarized signal of the Ku-band. The connector connects the common port to the straight line port. The partition cuts off the horizontal polarized signal of the Ku-band to be applied to the straight line port. The coupling slot couples the horizontal polarized signal of the Ku-band of the side port. The iris matches impedance between the coupling slot and the side port.