Measurement of the transient shielding effectiveness of enclosures using UWB pulses inside an open TEM waveguide

[摘要] Recently, new definitions of shielding effectiveness (SE) for high-frequencyand transient electromagnetic fields were introduced by Klinkenbusch (2005).Numerical results were shown for closed as well as for non closedcylindrical shields. In the present work, a measurement procedure isintroduced using ultra wideband (UWB) electromagnetic field pulses. Theprocedure provides a quick way to determine the transient shieldingeffectiveness of an enclosure without performing time consuming frequencydomain measurements. For demonstration, a cylindrical enclosure made ofconductive textile is examined. The field pulses are generated inside anopen TEM-waveguide. From the measurement of the transient electric andmagnetic fields with and without the shield in place, the electric andmagnetic shielding effectiveness of the shielding material as well as thetransient shielding effectiveness of the enclosure are derived.

[学科分类] 电子、光学、磁材料