Experimental Formulation to Estimate the Power Density in the Near Field of a Linear Transmitting Antenna

In order to find an estimation of the Near Field power density in the space between two half-wave dipole antennas, an empirical formulation was developed to achieve the reduced gain of the dipoles in the Fresnel region. The power density is calculated by taking the values of the wave impedance at each point in the space, which were found through the measurement results. The obtained results are helpful to the project designer prior to laboratory testing, saving time and costs. In the design of an antenna for a RF Harvesting System, once the effective area of the receiving antenna is known, the estimation of the captured energy is found in the particular case presented herein.