Patent ID: 8599575

Claim:
An electromagnetic interference (EMI) filter comprising: (a) a housing comprising a substantially enclosed first compartment and a substantially enclosed second compartment; (b) a first circuit card located in the first compartment of the housing that converts a signal transmitted on a conductive based medium to a signal transmitted on a non-conductive based medium; (c) a second circuit card located in the second compartment of the housing that converts a signal transmitted on a non-conductive based medium to an Ethernet signal; (d) at least one non-conductive based medium that transmits a signal from the first circuit card to the second circuit card; and (e) at least one waveguide through which the non-conductive based medium passes from the first compartment to the second compartment; the filter providing a radiated electromagnetic emission amplitude (dBμV/m) versus frequency (Hz) graph having a largest peak within a frequency range of about 30 MHz to about 1 GHz that is equal to or less than about 44 dBμV/m when measured at a distance of about 3 meters from the filter.