Current filter externally coupled to cable

{
  "publication_number": "US11482980B2",
  "country": "US",
  "kind": "B2",
  "title": "Current filter externally coupled to cable",
  "abstract": "A current filter externally coupled to a cable includes a coupling portion coupled to a cable portion to surround the cable portion including at least one cable, the coupling portion including a flexible metal, and a ground portion detachably attached to the coupling portion and transmitting a current flowing through the coupling portion to a ground plane.",
  "claims": [
    "1. A current filter externally coupled to a cable, the current filter comprising: a coupling portion coupled to the cable to surround the cable, the coupling portion including a flexible metal; and a ground portion detachably attached to the coupling portion and transmitting a current flowing through the coupling portion to a ground plane, wherein the coupling portion has a first end on one side and a second end on another side, the second end facing the first end, and the ground portion includes at least two ground rods, wherein the at least two ground rods include a first ground rod connected to the first end and a second ground rod spaced apart from the first ground rod and connected to the second end.",
    "2. The current filter of claim 1, wherein: the cable includes at least one transmission line and a metal shield surrounding the at least one transmission line, and the coupling portion forms a capacitive coupling with the metal shield of the cable.",
    "3. The current filter of claim 1, wherein the first ground rod includes a first coupling terminal coupled to the first end and a first ground terminal connected to the ground plane, and the second ground rod includes a second coupling terminal coupled to the second end and a second ground terminal connected to the ground plane, wherein the ground portion is detachably attached to the coupling portion through the first coupling terminal and the second coupling terminal, and transmits current induced in the coupling portion to the ground plane through the first ground terminal and the second ground terminal.",
    "4. A current filter externally coupled to a cable, the current filter comprising: a coupling portion coupled to the cable to surround the cable, the coupling portion including a flexible metal; a ground portion detachably attached to the coupling portion and transmitting a current flowing through the coupling portion to a ground plane; and a locking device attached to the coupling portion to fix the coupling portion to the cable.",
    "5. The current filter of claim 4, wherein the coupling portion has a cylindrical shape having a length extending in a first direction, wherein a diameter of a first cross-section taken by cutting the coupling portion in a second direction crossing the first direction is adjusted using the locking device.",
    "6. A current filter externally coupled to a cable, the current filter comprising: a coupling portion coupled to the cable to surround the cable, the coupling portion including a flexible metal; and a ground portion detachably attached to the coupling portion and transmitting a current flowing through the coupling portion to a ground plane, wherein the ground portion includes a ground plate in contact with at least a portion of the coupling portion, and a plurality of ground pins connected to the ground plate.",
    "7. The current filter of claim 6, wherein each of the plurality of ground pins includes a coupling terminal coupled to the ground plate and a ground terminal coupled to the ground plane, wherein the ground portion is detachably attached to the coupling portion through the coupling terminal, and transmits current induced in the coupling portion to the ground plane through the ground terminal.",
    "8. The current filter of claim 6, further comprising a locking device attached to the coupling portion to fix the coupling portion to the cable, wherein a size of the coupling portion when the coupling portion is coupled to the cable is adjusted using the locking device.",
    "9. A current filter externally coupled to a cable, the current filter comprising: a coupling portion coupled to the cable to surround the cable, the coupling portion including a flexible metal; and a ground portion detachably attached to the coupling portion and transmitting a current flowing through the coupling portion to a ground plane, wherein the ground portion includes a ground plate in contact with at least a portion of the coupling portion, wherein the ground plate has a mesh shape.",
    "10. The current filter of claim 9, wherein the ground plate includes a first surface in contact with at least a portion of the coupling portion, and a second surface opposite to the first surface and connected to the ground plane, wherein the ground portion is detachably attached to the coupling portion through the first surface, and transmits current induced in the coupling portion to the ground plane through the second surface.",
    "11. The current filter of claim 9, further comprising a locking device attached to the coupling portion to fix the coupling portion to the cable, wherein a size of the coupling portion when the coupling portion is coupled to the cable is adjusted using the locking device."
  ],
  "description_excerpt": "One or more embodiments relate to a current filter externally coupled to a cable to reduce the influence of external electromagnetic waves on the cable.\n\nHigh-altitude electromagnetic pulses (HEMPs) refer to electromagnetic pulses generated by a high-altitude nuclear explosion. In recent years, interest in HEMP protection facilities that can defend against HEMPs is increasing due to a nuclear threat caused by North Korea's nuclear development. The evaluation of these protection facilities is done through evaluation by electromagnetic shielding effectiveness (SE) and pulsed current injection (PCI) testing, and the contents thereof are specified in MIL-STD-188-125-1 which is the HEMP protection standard applied domestically and internationally.\n\nIn order to block a general external signal, a shield that covers the outside of a cable and is grounded, and a filter connected to a signal line are used. However, electromagnetic pulses (EMPs) or HEMPs have very strong energy, and this strong energy transfers energy exceeding the shielding performance of general shields and filters to the cable, and thus the protection system may be disabled. In addition, in the case of an internal filter, there is a problem in that the internal filter does not function properly when a received signal and an external noise signal have the same frequency.\n\nIn addition, when a standard or design target is given, it is difficult to change the internal filter and an external cable shield, and thus, it is difficult to efficiently cope with EMPs with energy spread out in a wide frequency range.",
  "cpc": [
    "H03H 7/0138",
    "F16B 2/08",
    "H01B 11/10",
    "H01P 1/202",
    "H02G 3/0481",
    "H02G 3/22",
    "H03H 1/0007",
    "H03H 7/0115",
    "H05K 9/0098"
  ],
  "ipc": [
    "H01P 1/202",
    "H02G 3/22",
    "H03H 7/01"
  ],
  "assignees": [
    "Agency for Defence Development"
  ],
  "inventors": [
    "Kil Soo JEONG",
    "Jeong Seop KIM",
    "Ju Hang SOHN",
    "Dong Hyeok Lee",
    "Chang Gyun KIM",
    "Soung Hwan CHI",
    "Heejae JUN",
    "Yong Woo Park"
  ],
  "filing_date": "2021-02-19",
  "publication_date": "2022-10-25",
  "grant_date": "2022-10-25",
  "priority_date": "2020-10-26",
  "application_number": "US-202117179408-A",
  "family_id": "81257720",
  "cited_by_count": 0,
  "citations": [
    "JPH06205527A",
    "US5493068A",
    "US20030218521A1",
    "US20150288233A1",
    "KR101609635B1"
  ]
}