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COMPARISON OF EMI

SUPPRESSANT TUBING WITH BEADS


The new EMI suppressant tubing introduces a 
breakthrough
in the field of RFI/EMI suppression.
When conventional EMI
filters could not be used
 practically, ferrite beads were used
to obtain some 
measure of suppression. EMI suppressant
tubing offers 
many superior qualities when compared to the
ferrite beads.

 



 

                   FERRITE BEADS

 
EMI
SUPPRESSANT TUBING

Saturation
Saturation at less than 5 amperes.
Therefore limited to line currents below this value
No saturation at any current.
Performance remains constant at any oper. freq.
Loss
Various losses at DC and at oper.freq. of 60, 400
& 1000Hz
No losses at DC or at any oper. freq.
Resonance
Resonate at relatively low freq. in the 1-100 MHz range.
Beyond resonant freq. attenuation drops off sharply.
No resonant freq. Attenuation increases with
frequency

         Attenuation        Increasing number of beads beyond a small number
      provides little attenuation increase. Resonant frequency
           is only shifted and attenuation drops off sharply after
                                    resonant frequency.
Attenuation is proportional to length and rises with
frequency.

         Permeability        Bead permeability is maximized. this limits their
attenuation characteristics beyond 50 MHz. Due to high
       permeability beads becoming lossy resisters and
                               attenuation is not enough.

Low permeability with high DC resistivity.
This is necessary for maximum smooth attenuation
from 10 MHz to 100 GHz.

 Flexibility Radiation
          Sheilding

        Ferrite beads are rigid, when more than one bead is
        usedthe gaps between the beads cannot effectively
        prevent RF radiation. Ferrite beads will radiate high
                                         frequencies
Flexibility and pliable. Can be applied with no
gaps or spaces. Can be used as an RF shield.



 
 
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