This paper presents a new test procedure for measuring theshielding effectiveness (SE) of small and medium-size enclosures againsthigh-frequency fields and currents in the frequency range up to 1 GHz.For the measurements, the method of coupled transmission lines is used.The external circuit is a 50 Ohm transmission line consisting of asingle cylindrical conductor fixed on the shield, while the internaltransmission line is formed by a sense wire in the center of theenclosure and the inner shield wall. The voltage transfer functionbetween the external and the internal transmission line provides anexpression for the SE
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