Antenna system for simultaneous triple-band satellite communication

1. An antenna system for triple-band satellite communication, comprising: a feed horn device that is configured to simultaneously radiate or absorb wireless signals of triple bands including X, Ku and Ka bands; and a waveguide section that is coupled to the feed horn device and configured to transmit input and output of the wireless signals, wherein the feed horn device comprises: a corrugation horn that is configured to radiate or absorb a first wireless signals of the X and Ku bands, the corrugation horn having a bell-like shape with a plurality of corrugations formed on an inner circumferential surface thereof in a stepped manner; and a Ka-band dielectric feed horn that is configured to radiate or absorb a second wireless signal corresponding to the Ka band which is the highest band and disposed in a central region of the corrugation horn, a reflector configured to enter the X and Ku-band signals incident thereto through the corrugation horn to a turnstile junction portion, and wherein the first wireless signals corresponded to the X and Ku bands is not radiated or absorbed through the Ka-band dielectric feed horn and the second wireless signal corresponded to the Ka band is radiated or absorbed only through the Ka-band dielectric feed horn, and wherein the first wireless signals radiated through the corrugation horn is again radiated through the reflector, and the second wireless signal radiated through the Ka-band dielectric feed horn is not radiated through the reflector.

2. The antenna system of claim 1 , wherein the waveguide section comprises:

a coaxial waveguide having an inner side configured to interconnect the Ka dielectric feed horn and a first waveguide, and an outer side configured to interconnect the corrugation horn and a second waveguide; and

a turnstile junction portion that is configured to interconnect the coaxial waveguide and the second waveguide.

3. The antenna system of claim 2 , wherein the turnstile junction portion comprises four double-rigid waveguides that are configured to interconnect the outer side of the coaxial waveguide and the second waveguide such that the wireless signals of the X and Ku bands are spaced, respectively, by more than half wavelength on the orthogonal mode basis.

4. The antenna system of claim 3 , further comprising a diplexer connected to the turnstile junction portion and configured to separate or combine the wireless signals of the X and Ku bands,

wherein the diplexer comprises:

a common port; and

first to third ports connected to the common port and orthogonal to one another,

wherein a horizontal polarization and a vertical polarization of the X-band wireless signal are separated or combined for transmission through the first and second ports, and the Ku-band wireless signal is transmitted through the third port.

5. The antenna system of claim 4 , further comprising a first orthogonal mode transducer connected to the third port and configured to separate or combine a horizontal polarization and a vertical polarization of the Ku-band wireless signal.

6. The antenna system of claim 5 , further comprising a polarizer formed at one side of the first waveguide, and configured to generate a circular polarization with respect to the Ka-band wireless signal.

7. The antenna system of claim 6 , further comprising a second orthogonal mode transducer connected to the polarizer and configured to separate or combine a horizontal polarization and a vertical polarization of the Ka-band wireless signal.

8. The antenna system of claim 6 , wherein the polarizer is a corrugation polarizer configured in a manner of forming a plurality of corrugated portions in a sawtooth shape along an inner circumference of a waveguide having a square section.