Equivalent Probe Model of Non-contact Measurement for Near-field

In this paper, a complete equivalent circuit model for electric field probes in non-contact measurement is proposed. At first, we used the electromagnetic simulation software by Ansys Q3D to construct a segmented three-dimensional electric field probe structure, extract the capacitance, inductance, and resistance respectively. Then we use the transmission line pi-model to create an equivalent circuit model and bring in the probe parameters extracted in sections by ADS circuit simulation software. Finally, compare the characteristics of the constructed probe with the original one to confirm the feasibility of the probe model. It can further realize the establishment of probe coupling transmission line structure so that the characteristics of the system circuit can be restored in the future.