The role of the drain wire in modern foil cable shields
Hoeft, L.O.
Estes, J.C.
BDM Int., Inc., Albuquerque, NM;
This paper appears in: Electromagnetic Compatibility, 1993. Symposium Record., 1993 IEEE International Symposium on
Publication Date: 9-13 Aug 1993
On page(s): 16-19
Meeting Date: 08/09/1993 - 08/13/1993
Location: Dallas, TX, USA
ISBN: 0-7803-1304-6
References Cited: 4
INSPEC Accession Number: 4991599
Digital Object Identifier: 10.1109/ISEMC.1993.473789
Current Version Published: 2002-08-06
Abstract
Theoretical and experimental analysis of a wide range of shields
that combine an electrically thin cylindrical shield with a drain
wire/current diverter shows that the surface transfer impedance can be
characterized as a solid foil shield in parallel with the impedance of
the drain wire. The drain wire/current diverter should be modeled as an
inductor and a frequency-dependent resistor in series. The resistance is
frequency-dependent because of skin depth effects. Neglecting
high-frequency aperture coupling, the surface transfer impedance of a
foil shield with drain wire can be characterized in three frequency
regimes. At low frequencies, the transfer impedance is determined by the
resistance of the drain wire. At intermediate frequencies, the
resistance of the drain wire increases due to skin depth and inductive
effects. For most cable shields, the skin depth effect will dominate. At
higher frequencies, for cable samples that use good (circumferential)
shield termination techniques, the surface transfer impedance is
determined by the transfer impedance of the foil shield
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