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Neelakantam Venkatarayalu, Chi-Chih Chen, Fernando L. Teixeira, Robert Lee Abstract A detailed characterization of the input impedance of ultra-wideband (UWB) dielectric horn antennas is presented using the finite-di.erence time-domain (FDTD) technique. The FDTD model is first validated by computing the characteristic impedance of two conical plate transmission lines (including planar bow-tie antennas) and comparing the results to analytical solutions. The FDTD model is next used to calculate the input impedance of dielectric horn antennas using the conical plates as launchers. Design curves of the input impedance for different choices of geometries and dielectric loadings are provided. The modeled antennas are particularly attractive for applications such as UWB ground penetrating radars (GPR) applications. [Back] |