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Controlling Radiation from External Cables

  • Michel Mardiguian
Part of the The Springer International Series in Engineering and Computer Science book series (SECS, volume 580)

Abstract

As soon as an equipment is fitted with external cables whose length exceeds the largest box dimension, it is highly probable that these cables will become the largest contributors to radiated emissions (and susceptibility, as well). We have seen (in sections 2.4 and 2.5) that two types of excitation drive these cables as radiating antennas:
  1. 1.

    Differential-mode (DM) excitation, where the currents are balanced (equal and opposite) in the wire pairs. Unless the outgoing and return carriers are spaced very far apart and untwisted, this mode is a minor contributor, though measurable.

     
  2. 2.

    Common-mode (CM) excitation, where the unbalanced portion of the current flows in the whole cable-to-ground loop. Due to the huge size of the antenna, this mode largely dominates DM excitation.

     

Keywords

Ground Plane Coaxial Cable Shield Effectiveness Cable Length Transfer Impedance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2001

Authors and Affiliations

  • Michel Mardiguian

There are no affiliations available

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