Design of a High Gain and Low Cross-Polarization Tri-Band Horn Antenna

In this paper, a high gain and low cross polarization horn antenna is proposed, which is able to work in three frequency bands of L/C/X. For the tri-band horn antenna, the good VSWR, high gain, and low cross-polarization can be achieved by optimizing the feed position and structure. The simulated results show that the gain of the antenna is greater than 13 dBi, the cross-polarization level is below -45 dB, and the VSWR is less than 1.25 in L-band ($1.2\pm 0.1\mathrm{GHZ})$; the gain of the antenna is greater than 19 dBi, the cross-polarization level is lower than -40 dB and the VSWR is less than 1.5 in C-band $(5.4\pm 0.12\mathrm{GHz}$; the gain of the antenna is greater than 19 dBi, the cross-polarization is no more than -30 dB and the VSWR is less than 1.10 in X-band $(9.6\pm 0.6$ GHz$)$,