| 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.
|
