Research and design on ultra-wideband dielectric hemispheric lens loaded quad-ridged horn antenna

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.

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