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LF Scattering of a cylindrical shield in an alternating magnetic field
Dick Harberts, Geran Peeren, Mark van Helvoort
Philips, Netherlands, The
Electromagnetic shields are commonly applied to reduce electromagnetic emission from electronic circuits. In many applications, also the scattering of incident magnetic fields has to remain sufficiently low. Commonly-applied approximate formulas in literature give erroneous results for scattering at low frequencies. In this paper, an improved solution of the diffusion equation is presented that accurately describes scattering of a cylindrical shield in a transversal alternating magnetic field down to low frequencies.
Influence of Planar Material Size and Position on Shielding Effectiveness Measurements using the Dual Waveguide Method
Evangelia Tourounoglou1,2, Vasiliki Gkatsi1,2, Anne Roc'h3, Robert Vogt-Ardatjew4, Hans Schipper1, Frank Leferink1,4
1Thales Netherland B.V. , Netherlands, The; 2Aristotle University of Thessaloniki, Greece; 3University of Eindhoven, Netherlands, The; 4University of Twente, Netherlands, The
The dual waveguide method for shielding effectiveness measurements is a very effective and practical method, as it can provide reliable results quickly and in a wide frequency range. However, when it comes to planar materials, the size and position of the sample is critical. Different sizes and shapes of the sample need to be tested in order to determine the one that provides reliable results. Furthermore, the position of the sample along the waveguide, as well as its distance from the source, using different lengths of waveguides, need to be investigated. In this paper, these two parameters are studied in order to examine their effect on the results.
Characterization of the Low Frequency Electric and Magnetic Shielding Effectiveness of On-Board Gaskets in the Stripline Set-up
Yanling Wang1, Tim Claeys2, Davy Pissoort2
1Xi'an Microelectronics Technology Institute, China, People's Republic of; 2KU Leuven Bruges Campus, Spoorwegstraat 12, Bruges, Belgium
This paper studies new sources to be used the stripline set-up for the measurement of shielding effectiveness of on-board gaskets. While the original goal of the study was to
develop sources that increase the low frequency dynamic range of the stripline set-up, it became clear that the low frequency dynamic range can be increased but that at those frequencies sources either represent either an electric or magnetic source.
This knowledge allows to use the stripline set-up to characterize either the low frequency electric or the magnetic shielding effectiveness, which is quite important for on-board applications due to the small distances between the on-board sources and the on-board shield.