Unified characterization of UWB antennas in time and frequency domains: an approach based on the singularity expansion method

In this work, an approach based on the Singularity Expansion Method [1] is employed to obtain a semi-analytical representation for the effective length operator and a transfer function of UWB antennas. This operator can be employed in the calculation of some important parameters related to UWB antennas, such as the gain operator and the time-independent radiation pattern, allowing an unified characterization of antennas in time and frequency domains. Some preliminary results of the construction of impulsional induced currents, from which the effective length operators can be derived, are presented for antennas comprising thin wires.