中文摘要：

在THz频段喇叭天线的口径面上加装金属面，金属面上环绕天线口径排布金属圆柱构成光子晶体，利用光子晶体带隙可以抑制表面波的特性，建立了THz光子晶体天线的物理模型。采用电磁仿真软件优化设计了一个新型的THz光子晶体天线，该天线工作频率为300 GHz，最大增益为17.6 dB。与传统的喇叭天线相比，其增益变大，主瓣变窄，背瓣减弱，方向性得到了较大的改进。

英文摘要：

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 300 GHz and the gain of THz antenna gain is 17.6 dB. Compared with the traditional antenna, the gain is increased, main lobe narrowed, antical lobe weakened, and the directivity improved.