Disclosed are a Yagi-Uda antenna and a Yagi-Uda antenna design method operating in the terahertz band. Yagi-Uda antenna according to the present invention, by using the driver as a full-wave dipole can have a high input impedance characteristics, thereby improving the impedance mismatch between the antenna and the photomixer. In addition, by providing a bias line vertically connected to the driver of the antenna, it is possible to apply a DC voltage to the photomixer. Further, by arranging two reflectors, the bias line and the reflector can be prevented from affecting each other. In addition, by applying a photonic bandgap (PBG) structure between the bias lines, it is possible to prevent the current of the antenna from escaping to the bias line. In addition, by placing the antenna on a thin substrate, it is possible to exhibit the unidirectional directional radiation characteristic inherent in the Yagi-Uda antenna.
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