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A dielectric-loaded quad-ridged horn antenna (DQRHA) that operates at 14–38GHz frequency band with dual-polarized character is analysed and simulated for ultra-wideband applications. The dielectric loading method using a perpendicular circular dielectric above the aperture can increase the gain of the quad-ridged horn antenna by 1−1.5dB from 17GHz to 38GHz. Simulated results of VSWR and gain prove that the DQRHA can achieve high gain from 14GHz to 38GHz with VSWR<2 for the two ports.