Dimension reduction of conical horn antennas by adding structure of metamaterial

This paper proposed the technique for reducing the dimension of conventional conical-horn antenna for C-band frequency (~5 GHz) by using metamaterial technique on the structure of mushroom-like electromagnetic band gap (EBG). The main idea of this research is the modified EBG structure for improve conical horn antenna, which is gouged in shape of square-ring slots on the outer surface of ground plane for coupling EM waves from conical horn through such structure. We found that the length of new conical horn antenna is shorter than of the conventional conical horn antenna about 44.82%, while the obtained gain is about 19.7 dB, which higher than the conventional horn. The new antenna can significantly antenna size while enhancing antenna gain.