“…Although the electrical size of the conventional PQHA has been designed already tiny, the ultimate need is coming from the mobile headset and the satellite communication, especially in the military applications. It is well known that the equipments' stealth capability is one of the most important performances, while the antennas are always the complicated part in the Radar Cross Section (RCS) reduction, so the PQHA with low profile still to be one of the hot 1 [5] , meandering the printed linear elements [6] , insertion of gaps in the helix arms [7][8][9] , changing the turn angle of helix [10] , using pre-fractal method [11] and using different diameters of the two helices [12] . However, in the former method, using of the dielectric absorption reduces the radiation efficiency of the antenna, while the insertions of gaps make the fabrication complicated, and the pre-fractal method reduces the axial length only by 30%.…”