Far field antenna factor estimation for a single antenna measurement using time frequency analysis

We have already proposed a single antenna method for estimating an antenna factor of log-periodic dipole array antenna at 10 m antenna distance. In this paper, we apply a time-frequency analysis to suppress some undesired reflection waves for our single antenna method. And, we estimate the far field antenna factor using estimated antenna distance that determined by the time-frequency analysis. Further, we apply the antenna radiation center distance modified equation for estimate the far field antenna factor of log-periodic dipole array antenna. We show the result that compare with the estimated far field antenna factor and antenna factors using other methods. The estimated antenna factor by our proposed method has good agreement with far field gain that is less than 0.3 dB difference in the frequency range from 300 MHz to 1000 MHz at antenna height D= 5 m.