Patent ID: 8519665

Claim:
An adjustable EMI suppression core comprising: an outer core having a first reluctance and further comprising a first circular aperture, a second circular aperture, and a third circular aperture arranged in sequence; said first and third apertures having equal diameters and being dimensioned to pass respective wires therethrough; said first and third apertures disposed at a distance from a nearest point of the second aperture, said distance less than the diameters of the first and third apertures; an inner core being rotatably engagable within said second aperture, said inner core and said second aperture having mating threads; a plastic case enclosing said outer core and said inner core; said inner core further comprising a first section having a second reluctance having a value not more than two times the first reluctance, a second section having a third reluctance at least five times the first reluctance, and a third section having said second reluctance; wherein a normal mode permeance peak and a common mode permanence peak are ninety degrees out of phase with each other when the inner core is rotated within the second aperture; and wherein, for each 180° rotation of the inner core within the second aperture, the normal mode permeance and common mode permeance peaks are greater than the respective normal mode permeance and common mode permeance peaks 180° previous.