Patent ID: 8462753

Claim:
A mobile tri-band antenna system, comprising: an indoor apparatus for controlling the antenna system; and an outdoor apparatus including a rotating unit for tracking a satellite, a fixing unit for fixing the outdoor apparatus, and a rotary joint means for connecting the rotating unit and the fixing unit, the outdoor apparatus including: a dual reflecting means for receiving first and second frequency band satellite signals from the satellite, and transmitting a third frequency band satellite signal to the satellite; a tri-band feeding means for dividing the first frequency band satellite signal as received from the dual reflecting means into a plurality of channel signals, receiving the second frequency band satellite signal, and transmitting the third frequency band satellite signal, wherein the tri-band feeding means includes a feeding horn means for transmitting and receiving the second and third frequency band satellite signals with the dual reflecting means, the feeding horn means including a stepped protruding dielectric rod inserted into a circular waveguide for impedance matching, a polarization converting means for converting a linear polarized wave signal to a circular polarized wave signal and vice versa, an identifying means for identifying the second and third frequency band satellite signals, and a feed array means for dividing the first frequency band satellite signal into a signal of a first channel in a horizontal direction of the azimuth angle and a signal of a second channel in a vertical direction of the elevation angle, according to an arrangement of feed array elements of the feed array means; a beam shaping means for further dividing the plurality of channel signals into a plurality of first channel signals and a plurality of second channel signals, and combining power of the plurality of first channel signals and power of the plurality of second channel signals through channel switching; an antenna controlling means for driving the antenna system according to the azimuth angle and the elevation angle to direct the satellite according to the power-combined second channel signals from the beam shaping means; a downlink frequency means for converting the second frequency band satellite signal to a first downlink frequency; an uplink frequency means for converting the third frequency band satellite signal to an uplink frequency; a first triplexing means for outputting the power-combined first channel signals from the beam shaping means to the rotary joint means; and a second triplexing means for converting the power-combined first channel signals, inputted from the rotary joint means, to a second downlink frequency and providing the converted first channel signals to the indoor apparatus.