Late-time ringing characterization of cavity-backed UWB printed monopole antenna

This paper deals with the characterization of late-time ringing of cavity-backed ultra-wide band (UWB) printed monopole antenna. The proposed antenna is designed to have the working bandwidth of 5000MHz implementable for ground penetrating radar (GPR) application. A metallic cavity is developed to equip the antenna in order to get a unidirectional radiation pattern, therefore it is called as cavity-backed UWB printed monopole antenna. As one of critical parameters in GPR application, late-time ringing of the antenna is characterized experimentally in the conjunction with other parameters such as return loss, gain, and radiation pattern. From the characterization result, the antenna which is printed on a 1.6mm thick FR4 epoxy dielectric substrate works well within the frequency range of 50-5000MHz with the ringing level lower than -40dB for pulse of 5ns duration.