  We present an analytical method to study the angular distribution of THz
radiation driven by two-color laser-induced microplasma in nitrogen gas.
Directionally dependent temporal waveforms of the radiated THz pulse is
calculated. To do so, we have extended the photo-current model to calculate
three-dimensional distribution of the photo-induced current from which the far
field THz radiation is computed. We have also studied the effect of optical
polarization state and phase difference on the angular distribution of
radiation. Our study shows that for two orthogonally-polarized colors, not only
THz polarization state, but also the angular distribution of THz radiation is
mostly influenced by the second optical harmonic. The possibility of rotating
the angular radiation pattern around the axis of the laser propagation is
illustrated for circularly-polarized laser drivers by changing the optical
phase difference.
