Design of the THz Photonic Crystal Antennas

A novel photonic-band-gap (PBG) horn antenna model is presented by using a metallic PBG structure which is formed by square arrays of metal posts. The lowest global band gap of the two-dimensional PBG structure is determined numerically and the gap is used to reflect and focus the antenna radiation. The horn antenna is designed by using the photonic crystals and simulated by using electromagnetic simulation software. The operating frequency of THz antenna is 300GHz and the gain of THz antenna gain is 17.6dB. Compared with the traditional antenna, the gain is increased, main lobe narrowed, antical lobe weakened, and the directivity improved.