Method of designing devices based on transmission lines for testing radioelectronic equipment for electromagnetic compatibility

Annotation: Transmission line-based devices (TL) are often used as an al-ternative to anechoic and reverberation chambers when evalu-ating the shielding effectiveness of materials and cables, as well as the levels of emission and susceptibility of small radioelec-tronic equipment (RE), in the context of electromagnetic com-patibility (EMC). One type of structurally complex devices based on TL are TEM cells. They are a closed system of a com-plex metal structure in which transverse electromagnetic waves propagate. These waves generate an electromagnetic field where parameters are in accordance with standards for conduct-ing EMC tests. Development of such devices based on TL with specified parameters and characteristics often represents a chal-lenge. The technique developed in this work made it possible, through the use of several types of computer simulation and cal-culation, to take into account the technological processes of manufacturing a complex shape of waveguide structures made of metal at the design stage. The technique is described in detail using the example of creating a classical symmetrical TEM cell for testing RE objects for EMC up to 20×100×100 mm in size, at |S11| ≤ –21.2 dB in the frequency range up to 2 GHz. It has been tested in the process of creating devices based on TL: a stripline, a small-sized TEM cell and a CTEM cell with operat-ing frequency ranges up to 3, 5 and 12 GHz, respectively.

Keywords: parametric optimization, computer simulation, radioelectronic equipment, tem-cell, electro-magnetic compatibility, transmission lines, design methodology