Analysis of GPR UWB Half-Ellipse Antennas With Different Heights of Backed Cavity Above Ground

Ultrawideband (UWB) antenna is a critical part of the ground penetrating radar (GPR) system, and the bow-tie antenna is the most popular one in all kinds of UWB antennas. In this letter, an antenna with two half-elliptical-shape arms, which is an improvement of the bow-tie antenna, is presented with the input impedance of around 100 ¿. The voltage standing wave ratio (VSWR) and radiated waveform are analyzed as the antennas with different backed cavity heights and different elevations above ground surface. The influence of the vehicle on which the half-ellipse antenna (HEA) is mounted is also given in the above three aspects.