# US 2014/0191920 A1 · Low passive intermodulation chokes for electrical cables > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0191920 A1 - Document ID: US20140191920A1 - Status: Published application - Kind: A1 - Application number: 13/797,940 - Filed: 2013-03-12 - Published: 2014-07-10 - Earliest claimed: 2013-01-10 - Assignees: Venti Group, LLC - Inventors: WILLIAM ERNEST PAYNE; RICHARD SMITH - Web page: https://patentgrep.com/patent/US20140191920A1 ## CPC - H01Q 1/526: {Electromagnetic shields} - H01Q 1/52: Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure (absorbing means H01Q17/00) - H01Q 21/26: Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract This disclosure relates to chokes for suppressing undesired signals such as such as common mode electromagnetic interference (EMI) and/or radio frequency interference (RFI). The chokes can include an electro-conductive sleeve disposed over an electrical cable and the sleeve can be configured to suppress an undesired signal. In some embodiments, the electro-conductive sleeve and have a half-wave sleeve, which can be electrically open at both ends. Additional insulating material can be included between the electrical cable and the sleeve. Multiple electro-conductive sleeves and be disposed substantially concentrically over the cable. The chokes can be configured to reduce passive intermodulation (PIM). The sleeve can have a longitudinal slot that extends the length of the sleeve. The sleeve can include multiple slots that separate the sleeve into multiple panels, which can be configured to suppress different signals. ## Claims ### Claim at position 1 -13. (canceled) ### Claim 14 An antenna array system comprising: a plurality of antenna elements; a splitting module configured to couple the plurality of antenna elements to at least one feed line; an electrical cable coupling the splitting module to at least one of the plurality of antenna elements; and a choke for suppressing an undesired signal, the choke configured to exhibit low passive intermodulation (PIM), the choke comprising an electro-conductive sleeve disposed over an outer surface of the electrical cable, wherein a longitudinal slot is disposed between ends of the electro-conductive sleeve, and wherein the longitudinal slot extends through the entire electro-conductive sleeve. ### Claim 15 (depends on 14) The antenna array system of claim 14, further comprising: a radiating component coupled to the electrical cable, the radiating component configured to emit energy; and a shield member disposed over the radiating component, the shield member configured to suppress at least some of the energy emitted by the radiating component; wherein the choke is coupled to the shield member such that positioning the shield member over the radiating component causes the choke to be disposed over the electrical cable. ### Claim 16 (depends on 15) The antenna array system of claim 15, wherein the choke is electrically insulated from the shield member. ### Claim 17 (depends on 4) The antenna array system of claim 4, wherein the electro-conductive sleeve is a half-wave sleeve. ### Claim at position 6 -94. (canceled) ### Claim 95 (depends on 14) The antenna array system of claim 14, wherein the choke comprises a second electro-conductive sleeve disposed over the electro-conductive sleeve, wherein a second longitudinal slot is disposed between ends of the second electro-conductive sleeve, and wherein the second longitudinal slot extends through the entire second electro-conductive sleeve. ### Claim 96 (depends on 95) The antenna array system of claim 95, wherein the second electro-conductive sleeve has a length that is shorter than the electro-conductive sleeve. ### Claim 97 (depends on 95) The antenna array system of claim 95, wherein the choke comprises an insulating layer disposed between the electro-conductive sleeve and the second electro-conductive sleeve. ### Claim 98 (depends on 95) The antenna array system of claim 95, further comprising additional insulating material disposed between the electro-conductive sleeve and an insulating outer jacket of the electrical cable, wherein the additional insulating material is configured to increase suppression of EMI and/or RFI by the choke. ### Claim 99 (depends on 14) The antenna array system of claim 14, further comprising additional insulating material disposed between the electro-conductive sleeve and an insulating outer jacket of the electrical cable, wherein the additional insulating material is configured to increase suppression of EMI and/or RFI by the choke. ### Claim 100 (depends on 99) The antenna array system of claim 99, wherein the electrical cable has a radius and wherein the additional insulating material has a thickness of about 25% to about 200% of the radius of the electrical cable. ### Claim 101 (depends on 99) The antenna array system of claim 99, wherein the electrical cable has a radius and wherein the additional insulating material has a thickness of about 50% to about 100% of the radius of the electrical cable. ### Claim 102 (depends on 99) The antenna array system of claim 99, wherein the additional insulating material is a different type of material than the insulating outer jacket of the electrical cable. ### Claim 103 (depends on 14) The antenna array system of claim 14, wherein the ends of the electro-conductive sleeve overlap such that an area near a second end is disposed over an area near a first end. ### Claim 104 (depends on 103) The antenna array system of claim 103, wherein an insulating material is disposed between the area near the first end and the area near the second end. ### Claim 105 (depends on 103) The antenna array system of claim 103, wherein the area near the first end and the area near the second end are capacitively coupled. ### Claim 106 (depends on 14) The antenna array system of claim 14, wherein the electro-conductive sleeve extends around less than a full cross-sectional perimeter of the electrical cable. ### Claim 107 (depends on 106) The antenna array system of claim 106, wherein the electro-conductive sleeve extends around about 50% to about 95% of the cross-sectional perimeter of the electrical cable. ### Claim 108 (depends on 14) The antenna array system of claim 14, wherein an insulating material is disposed in the longitudinal slot between the ends of the electro-conductive sleeve. ### Claim 109 (depends on 14) The antenna array system of claim 14, wherein air is disposed in the longitudinal slot between the ends of the electro-conductive sleeve. ### Claim 110 (depends on 14) The antenna array system of claim 14, wherein the electro-conductive sleeve is insulated from the electrical cable.