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 +/- 0.1 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 +/- 0.12 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 +/- 0.6 GHz).