Reflector based fat monopole UWB antenna for impulse radar application

UWB antennas with a capability of radiating narrow time domain pulses is of great interest for short-range Impulse radar applications like through wall surveillance, ground penetrating radar, etc. This paper discusses design, analysis and measurement of a reflector based fat monopole antenna. The antenna was analyzed using Finite time domain solver to estimate the far zone Electric field for a Gaussian excitation. The important characteristics measured for this antenna is; bandwidth 620 MHz–25 GHz more than 190%. The dispersion characteristics of the antenna were evaluated by measuring transmission coefficient using two similar antennas in an anechoic chamber. Phase linearity and flat group delay across the stated band ascertain its pulse fidelity property and make it a suitable choice for Short Range Impulse Radar.