Compensation of frequency dispersion in time reversal techniques for ultra-wideband electromagnetic waves

The time reversal (TR) invariance of Maxwell´s equation is broken in a lossy dispersive medium. Although phase shift induced by the dispersion is automatically compensated by the TR process (via phase conjugation), attenuation during both forward and back-propagation in dispersive media is inevitable. A method based on short-time Fourier to compensate small losses due to dispersive attenuation due to has been proposed here. Numerical results were used to illustrate the effectiveness of the approach. Extension of the method to random medium and optimal windowing schemes are possible future research directions