Wide-band reflection coefficient measurements using direct and inverse frequency-time domain transformations

The problem of measurement of modulus of the reflection coefficient (RC) in wide frequency band in presence of additional reflections such as reflections in a horn antenna is considered. The Prony´s method and the method of separation of autocorrelation function of layered structure by windowing in time domain for the restoration of the square modulus of the RC in wide frequency band were compared. The values of the error of restoration methods under consideration in the chosen frequency band have been calculated. It has been shown the advantage of the Prony´s method application in sliding frame by the results of the numerical simulations and real measurement data processing. The technique of data extrapolation at the edges of the frequency band for applying Prony´s method is proposed.