  We report and demonstrate for the first time a method to compensate
atmospheric group velocity dispersion of terahertz pulses. In ultra-wideband or
impulse radio terahertz wireless communication, the atmosphere reshapes
terahertz pulses via group velocity dispersion, a result of the
frequency-dependent refractivity of air. Without correction, this can
significantly degrade the achievable data transmission rate. We present a
method for compensating the atmospheric dispersion of terahertz pulses using a
cohort of stratified media reflectors. Using this method, we compensated group
velocity dispersion in the 0.2-0.3 THz channel under common atmospheric
conditions. Based on analytic and numerical simulations, the method can exhibit
an in-band power efficiency of greater than 98% and dispersion compensation up
to 99% of ideal. Simulations were validated by experimental measurements.
