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A simple method for the measurement of complex permittivity is presented using an open TEM (Transverse ElectroMagnetic) cell. The scattering parameters of the TEM cell are measured with and without a rectangular sample of the material under interest in the cross section of the cell. Then the principle is to run a FDTD (Finite Differences Time Domain) simulation of the measurement setup and find the complex permittivity of the sample model which minimizes the error between measurement and simulation thanks to an optimization loop. This method provides the complex permittivity of any non-metallic materials between 1 kHz and 200 MHz. The aim of this work is to make a fast parameter extraction to build a 3D simulation model and predict the shielding effectiveness of a complex geometry made of such a material.

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In this paper, a "virtual" signal integrity method applied on twisted-wire pairs (shielded or not) is presented. The method is based on S-parameter measurements made in a reverberation chamber. From these balanced measurements, an impedance imbalance approximation is added in postprocessing through the introduction of a given common-mode rejection ratio. Then, the signal integrity can be tested for any level of the average electromagnetic field generated within the chamber. The method is illustrated in the simple case of a square useful signal in order to demonstrate the relevance of the method.

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