Low-profile Half Wavelength Ultra Wide Band Antenna

In this paper, the newly proposed designed antenna with low profile has overcome physical problems of the existing antenna for the aircraft or vehicles, and have performance suitable for wideband characteristics. The proposed antenna was designed with a half-wavelength hemispherical structure by applying the self-complementary principle and image theory. The size of antenna is 400 mm(diameter) × 200 mm(height). As a result, and the radiation patterns are similar to monopole antenna. Next, the structure of a redesigned rectangular a half-wavelength loop antenna for easy of fabrication. This antenna has a size of 196 mm(width) × 156.3 mm(height) × 158.7 mm(length). The radiation patterns are similar to the monopole antenna of a half-wavelength hemispherical structure. Finally, we newly proposed a low-profile wideband antenna to ensure a low-profile structure, while retaining the wideband characteristics. The low-profile wideband antenna has a size of 315 mm (width) × 110 mm(height) × 295 mm(length). The radiation patterns of the antenna are similar to those described earlier. Therefore, it is a new type of low profile and ultra wide band(100:1) antenna suitable for mounting the aircraft or vehicles.