Closed-Form Model for Calculating the Current Induced by the TEM-Cell Center Conductor

The improvement of the modern electronic component base is aimed at increasing the speed and the degree of integration. This leads to a decrease in the level of immunity of the to external electromagnetic interference. Consequently, it is imperative to analyze the amplitudes and waveforms induced currents and voltages on electronic components at the preliminary design stage. The utilization of analytical models in closed form is more advantageous than numerical methods, as it is less time-consuming. This paper presents an analytical model used to calculate the currents and voltages induced on a microstrip transmission line by the center conductor of a TEM-cell. The effects of sources with different waveforms are shown, namely, electrostatic discharge, the Gaussian pulse and harmonic signals at frequencies of 1 GHz, 100, and 10 MHz. It is shown that the analytical model allows for preliminary estimation of the induced current under the influence of different forms of signals at the TEM-cell input. The adequacy of the proposed analytical model was verified when the printed circuit board thickness and the microstrip transmission line length were varied. The maximum difference between the results obtained by the analytical model and numerical methods does not exceed 25%. A follow-up experiment showed the convergence of the results.