Abstract:In this paper, a novel dual-band Photonic Band Gap (PBG) structure was proposed and applied to a dual-band microstrip antenna. The antenna resonates at 1.267 THz and 1.502 THz, exhibiting reflection coefficients of -58.177, and -49.462 dB, and gains of 3.173, and 5.232 dBi, respectively. Compared with the microstrip antenna based on the homogeneous silicon substrate, the designed dual-band antenna based on the novel PBG structure shows improved impedance matching, radiation efficiency, and gain. The paper simulated and analyzed the impacts of different filling dielectric materials and the variations of dimensions, position, period, and corrugation depths of the du-al-band PBG structure on the resonances of the antenna. It is expected that the proposed novel dual-band PBG structure has great application potential，Such cancer diagnosis is done by utilizing the radiation characteristics of the antenna.