US 9,814,165 B1
Methods, devices, and systems for filtering electromagnetic interference
Stephen D. McNally, San Diego, CA (US)
Assigned to DJM ELECTRONICS, INC., San Diego, CA (US)
Filed by DJM Electronics, Inc., San Diego, CA (US)
Filed on Oct. 18, 2013, as Appl. No. 14/58,098.
Application 14/058,098 is a continuation of application No. 13/018,175, filed on Jan. 31, 2011, granted, now 8,599,575.
Claims priority of provisional application 61/301,134, filed on Feb. 3, 2010.
This patent is subject to a terminal disclaimer.
Int. Cl. H05K 9/00 (2006.01)
CPC H05K 9/002 (2013.01) 22 Claims
OG exemplary drawing
 
1. An electromagnetic interference (EMI) filter comprising:
(a) a housing comprising at least one substantially enclosed compartment, said housing attached to an electromagnetically shielded enclosure;
(b) at least one circuit card located in, but separate from a boundary of said compartment that converts a digital signal transmitted on a non-conductive based medium to a digital signal transmitted on a conductive based medium and that converts a digital signal transmitted on a conductive based medium to a digital signal transmitted on a non-conductive based medium;
(c) at least one non-conductive based medium that transmits a digital signal; and
(d) at least one waveguide configured to lessen or prevent passage of radiated electromagnetic interference below a cutoff frequency through which the non-conductive based medium passes to said compartment.