Voltage response and field reconstruction for a miniature fieldprobe in a spatially nonuniform electric field

A miniature E-field probe employing a 0.6-mm linear dipole antenna has been developed. The authors describe an analytical study of the probe's response to a spatially varying electric field. On the basis of the Nyquist sampling theorem, the spatial sampling frequency at which an electric field should be measured for good reconstruction is established. Using antenna theory, the voltage response of the probe is found in terms of the antenna's transmitting current and the measured electric field. This relationship is used to reconstruct the electric field from a set of discrete voltage responses. A method-of-moments program has been developed to determine numerically the voltage response of the antenna structure to a spatially varying electric field. Numerical results, which allow for the testing of certain theoretical findings important for analyzing measurement data, are presented. Although developed for only one-dimensional fields, the methodology can be applied to general three-dimensional fields