Design and Implementation of Wideband Quad-ridged Horn Antenna near Constant Gain

In this paper, design, simulation, Implementation and measuring of wide band quad-ridged horn antenna near constant gain is presented. These antennas designed for about 13dBi gain and 2-18GHz frequency band. For achieving good specifications, we divided it in two frequency band 2-6 and 6-18 GHz and used quad-ridged horn antenna. All antennas have two orthogonal vertical and horizontal polarization outputs. The radiation patterns are almost symmetrical. These type of antennas have many applications in wideband Monopulse radio direction finding and communication measuring. These antennas can use as: medium gain antennas, wideband antenna array and wideband reflector antenna’s feed. In this paper we discusses about wide band quad-ridged horn antenna, designing with reasonably constant beam width and gain, implementation, driving, adjusting and matching of antenna. Also mechanical tolerance affect in antennas output matching will explain. At the end two simulated and measured data compared with each other and show they are very close to each other. The designed antennas beam width stability compared with some similar references, and show that have better stability than them.