Dispersive properties of self-complementary log-periodic antennas in pulsed THz systems

We present a simple analytical model for the dispersion of a pulse radiated by a self-complementary logarithmic-periodic antenna. The model predicts the variation in the spectral phase, and explains the underlying mechanism behind it. The variation in the spectral phase predicted by the model is compared with the spectral phase measured with a Terahertz (THz) Time Domain System (TDS) System that uses the same type of antenna.