  In this paper, the microwave pulse propagation transferred through a
left-handed transmission line using Complementary Omega-Like Structures (COLS)
loaded was studied. There was a stop band in transmission from 5.6GHz to
6.1GHz, and the anomalous dispersion was causes in this band. Negative group
velocity corresponds to the case in which the peak of the pulse exited before
the peak of the incident pulse had entered the sample. The negative group
velocity reached (-0.27c~-1.85c).
