Effect of conductive objects on the magnetic field radiated by loop antennae

The magnetic field radiated from a small loop antenna is used for calibration of field strength meters. When conductive objects are in close proximity to the antenna, the magnetic field is affected by them. Experiments to study the effects of a conductive square plate smaller than 2 m on one side, and those of an upright human body on the magnetic field were carried out at the frequencies up to 50 MHz. The transmitting and receiving loop antennas were arranged coaxially, the spacing between them ranging from 0.25 to 0.75 m. The conductive objects were moved first in the parallel position to, and second in the normal position to the loop axis. The relationship between the limit of the errors and the distance from the object to the antenna is shown in the tables.