Dual circularly polarization antenna with High XPD for downlink communication of earth observation sateliite

This paper reports design and measurement of high Cross Polarization Discrimination (“XPD”) antenna system including waveguide converter and polarizer and corrugated horn antenna. We named antenna system as a “dual circularly polarization antenna”. We designed the system to operate in X-Band (8.2 GHz center frequency) over bandwidth of 400 MHz. We designed dual circularly polarization antenna using ANSYS/ HFSS finite element software. We measured XPD of dual circularly polarization antenna with polarization pattern method (Fig.4.). We measured -37dB -43dB XPD in the bandwidth. Also we verified mutual coupling effect when connecting corrugated horn antenna to polarizer is negligible.