Effects of Dipole Length on Dosimetric Probe Sensitivity

Accurate measurements of electromagnetic radiation effects on human body require the use of very sensitive and highly miniaturized dosimetric probes with electrically-small dipole-sensors to improve spatial scanning resolution. In this paper, the authors investigate the effect of decreasing the size of the dipole-sensors on the sensor sensitivity, as well as the effect of varying the relative-permittivity of the substrate and the probe-shell. Numerical simulations of various dipole-sensor lengths, substrate and shell relative-permittivity, have been performed using the finite-element-method. Results show that the dipole-sensors length is inversely proportional to the probe gain-magnitude; and it is preferable to use substrates with relative-permittivity as small as possible