Free space antenna facor evaluation of logperiodic antenna using time-domain and pulse compression techniques

We have proposed the method for evaluating the free-space antenna factor of a log-periodic broadband antenna (LPDA) with time-domain technique. Our method is based on the techniques of time domain analysis and pulse compression techniques. The proposed method enables us to isolate the direct wave from the reflected waves on the ground plane in an open area test site, and to evaluate the free-space antenna factor. In this paper, we explain the free-space antenna factors and its uncertainty of our proposed method.