Development of 10 kHz–400 MHz high sensitivity monopole electric field probe

As the electromagnetic environment becomes increasingly complex, the measurement of electric field intensity, a crucial parameter, is essential. An electric field probe is designed to fulfill this function. In this paper, the development of an electric field probe is presented, with a frequency range of 10 kHz–400 MHz. The probe comprises four components: a monopole antenna, an impedance conversion module, an amplifier, and a detection module. The probe utilizes DC voltage to indicate the field intensity. Following calibration in a TEM cell, the error of the probe is less than 6 dB. With the use of shielding, the probe’s sensitivity reaches 90 dB (μV/m), and the maximum detectable field intensity is 140 dB (μV/m).