Wave transmission lines and networks – Transmission line inductive or radiation interference...
Patent
1985-11-04
1988-07-26
Nussbaum, Marvin L.
Wave transmission lines and networks
Transmission line inductive or radiation interference...
333167, 333172, 333185, H03H 706
Patent
active
047603550
ABSTRACT:
A ferrite sleeve or bead either in round configuration or square or rectangular configuration and either whole or split is employed as a means for reducing radiation emissions associated with a computer or the like data processing system. The ferrite system is disposed over the I/O cable either over a segment thereof or along the length thereof and in one embodiment is in the form of one or more ferrite beads that may be associated with wires internal to the data processing system. In a further embodiment of the invention the ferrite sleeve may be replaced by an equivalent circuit network comprising a parallel inductor and resistor in which the inductor is wound over a resistive core. The ferrite sleeve is dimensioned to have an impedance at the operating frequency greater than the signal cable conductor means radiation resistance, thus establishing a voltage divider circuit between the impedance of the ferrite sleeve and the radiation resistance, to thus reduce emissions due in particular to common mode noise.
REFERENCES:
patent: 2368474 (1945-01-01), Keister
patent: 3191132 (1965-06-01), Mayer
patent: 3516026 (1970-06-01), Curran et al.
patent: 3551858 (1970-12-01), Cielo
patent: 4378539 (1983-03-01), Swanson
patent: 4506235 (1985-03-01), Mayer
patent: 4519664 (1985-05-01), Tillotson
Grant-"The Use and Misuse of Cores to Suppress Digital System Noise", Electronics, Jan. 18, 1971; pp. 77-80.
Dash Glen
Straus Isidor
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