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Based on the ultra-wideband ridged horn antenna theory in communication system, a new quad-ridged horn antenna with a lens is described in this paper, which consists of a quad-ridged horn and a dielectric hemispheric lens. By simulation and optimization with CST MWS software which is based on the finite integration technique, a dual polarization dielectric lens loaded quad-ridged horn antenna can realize higher gain and ultra-wideband character. The result shows that in ideal state, the dielectric lens can increase the gain of quad-ridged horn antenna with 3 dB and the 15 dB gain is very important in some application. Besides, the volume of the system does not enlarge much. The simulated return loss S₁₁ of the horn antenna system is better than -10 dB during the operating frequency band from 2 GHz to 18 GHz. Also, for its own structure of the quad-ridged horn antenna, it can realize dual polarization character as describe in this paper. The simulation results and analyses of the ultra-wideband quad-ridged horn antenna are presented.

dielectric lens; quad-ridged horn antenna; ultra-wideband