  We analyze the I-V characteristic of a double quantum well integrated in an
antenna and driven by THz radiation.We propose a microscopic model to calculate
the sequential current including selfconsistently the Coulomb interaction in a
mean field approximation.Additional features in the current appear which depend
not only on the frequency and intensity of the ac field but also on the charge
in the wells.We observe,for some intensities and frequencies of the ac
field,dynamical localization, i.e., quenching of the transmission,and, in the
linear response regime, absolute negative conductance.We compare our
calculations with recent experiments in driven double wells.
