Evaluation of Frequency Characteristics of Absorbing Materials Using Time-Domain Single Antenna Method at Standard Site

Frequency characteristics of absorbing materials are evaluated in single-antenna calibration technique using a log- periodic antenna on a standard ground plane. The technique is applied to the data both in frequency- and time-domains, to evaluate the frequency characteristics of absorbing materials on the ground plane. Time-domain subtraction enables us to separate the wave reflected from absorbing materials. As a result, we have found that the dynamic range of our proposed method is more than 40 dB throughout a wide frequency range from 700 MHz to 2000 MHz.