Conformal equiangular spiral antenna on circularly truncated cone with electromagnetic band-gap structure

The paper proposes a conformal equiangular spiral antenna on the circularly truncated cone with electromagnetic band-gap structure(EAS-EBG antenna), which shows wideband characteristics with respect to the gain. Firstly, a conformal equiangular spiral antenna on the circularly truncated cone(EAS antenna) is modeled and analyzed by using the professional software HFSS. Next, the EAS-EBG antenna is studied, which inserts a small area of electromagnetic band-gap(EBG) structure into the circularly truncated cone to remain conformal and increase gain. The simulation shows that the antenna gain increases about 1 to 3 dB within the frequency range from 5 to 12 GHz and the axial ratio remains almost unchanged.