Design of a drop-shaped ultra-wideband ground-penetrating radar antenna

In this paper, an ultra-wideband shielded ground penetrating radar antenna is designed. By adding elliptic arms on both sides of the antenna and semi-circular arms at the end of the antenna, the effective bandwidth of the antenna is greatly expanded and the size of the antenna is greatly reduced. In addition, metal shielding back-cavity is added to the rear of the antenna to improve the anti-interference ability and directional gain of the antenna. The modeling and simulation by finite element simulation software HFSS electromagnetic optimization, to simulate the port input impedance of the antenna at different shielding back-cavity heights, and analyze the radiation characteristics in frequency domain, designed an antenna working at 250 ~ 380 MHZ, whose center frequency is 310 MHZ, relative bandwidth is 42%, the return loss is less than -10 dB, meet the conditions of ultra-wideband antenna.