EBG structures for antenna design at THz frequencies

Antennas designed in the THz band using conventional metallic waveguides have a poor performance due to the high losses of non-ideal conductors at THz frequencies. To avoid this problem, low-loss waveguides at high frequencies, e.g. ribbon waveguides or metallic wires, might be used. This paper presents the design of antennas in the THz band by means of a new rectangular waveguide. This waveguide is formed by a 1D-EBG structure on side walls, and a 3D-EBG structure, known as woodpile, on upper and lower walls. The resulting waveguide has a low attenuation in the THz band and allows the easy formation and fabrication of devices and horn antennas.