Using TEM Cell Measurements to Estimate the Maximum Radiation From PCBs With Cables Due to Magnetic Field Coupling

• Published in: IEEE transactions on electromagnetic compatibility Vol. 50; no. 2; pp. 419 - 423
• Main Authors: Shaowei Deng, Hubing, T.H., Beetner, D.G.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.05.2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Boards; Cables; Couplings; Design. Technologies. Operation analysis. Testing; Electric potential; Electrical engineering. Electrical power engineering; Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; Exact sciences and technology; Inductance; Integrated circuits; Joining; Magnetic field coupling; Magnetic field measurement; Magnetic fields; Mathematical models; Microstrip; mutual inductance; radiated emissions; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; TEM cells; Transformers and inductors; Transmission electron microscopy; transverse electromagnetic (TEM) cell; Voltage; Voltage measurement; mutual inductance; radiated emissions; transverse electromagnetic (TEM) cell; Magnetic field coupling; Printed circuit board; TEM mode; Mutual inductance; Modeling; Magnetic moment; Electric field; Transmission electron microscopy; Magnetic coupling; Integrated circuit; radiated; Printed circuit; Mathematical model; Radiated power; Magnetic field
• ISSN: 0018-9375; 1558-187X
• DOI: 10.1109/TEMC.2008.919026

Common-mode currents can be induced on cables attached to printed circuit boards (PCBs) due to electric and magnetic field coupling. This paper describes a technique for using transverse electromagnetic (TEM) cell measurements to obtain an effective common-mode voltage (or magnetic moment) that quantifies the ability of traces and integrated circuits on PCBs to drive common-mode currents onto cables due to magnetic field coupling. This equivalent common-mode voltage can be used to reduce the complexity of full-wave models that calculate the radiated emissions from a system containing the board. It can also be used without full-wave modeling to provide a relative indication of the likelihood that a particular board design will have unintentional radiated emissions problems due to magnetic field coupling.