The very high impedance, multi-turn FerriShield ferrite from Leader Tech offers a massive amount of EMI suppression in a very small 1.25 x 1.23 x 1.25 inch package. The bisected, snap-on design offers three pass-through openings for cables with a diameter up to .203” (5,8mm).
To boost impedance a cable can be “looped” through 1, 2 or 3 of the ferrite openings. A single pass through the SS28B2035-3 ferrite provides 340 ohms of impedance at 100MHz. If the same cable is passed through additional holes, impedance is equal to the square of the number of turns. Depending on circuit load and frequencies involved, much of the increase can be realized.