engleski

Symmetrical Transversal Electromagnetic Mode Cell

Transverse electromagnetic (TEM) transmission line cells are devices used to establish and measure electromagnetic (EM) fields in a shielded environment. The TEM cells are used for radiated emission and immunity testing of electronic equipment or integrated circuits. They consist of the central part, which is a rectangular coaxial transmission line, and tapers that are used as transitions from coaxial connectors to the central rectangular part. This report presents the methodology for analysis of symmetrical TEM cells. Several aspects of the TEM cell are analyzed. Electromagnetic simulations are used to get insight into electric and magnetic field distributions and to determine S-parameters and voltage standing wave ratio. Analytical approach is used to calculate characteristic impedance as well as resonant and cut-off frequencies. When using EM simulations the TEM cell is treated by varying levels of geometrical complexity. Firstly, 2D EM simulations have been performed in order to analyze a cross-section of the cell and to establish correlation with known analytical approaches to calculate characteristic impedance and resonant frequencies. Secondly, 3D EM simulations are performed without taking into account the tapers ; these simulations are labelled as 2.5D simulations. Thirdly, full 3D EM simulations are done by including the tapers in the simulated structure. Additionally, the influence of the PCB test port is analyzed.

TEM cell

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