# US 10,056,687 B2 · Flexible elongated inductor and elongated and flexible low-frequency antenna > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,056,687 B2 - Document ID: US10056687B2 - Status: Granted - Kind: B2 - Application number: 15/448,212 - Filed: 2017-03-02 - Published: 2017-09-07 - Granted: 2018-08-21 - Earliest claimed: 2016-03-04 - Assignees: Premo, S.L. - Applicants: Premo, S.L. - Inventors: Antonio Rojas Cuevas; Francisco Ezequiel Navarro Perez; Claudio Cañete Cabeza - Web page: https://patentgrep.com/patent/US10056687B2 ## CPC - H01Q 7/08: Ferrite rod or like elongated core - H01F 3/08: made from powder (powder coatings on sheets H01F3/02; on strips or ribbons H01F3/04; on wires H01F3/06) - H01F 3/10: Composite arrangements of magnetic circuits - H01F 27/022: {Encapsulation} - H01F 27/24: Magnetic cores - H01F 27/263: {Fastening parts of the core together} - H01F 27/266: {Fastening or mounting the core on casing or support (on coil H01F27/30)} - H01F 27/28: Coils; Windings; Conductive connections - H01Q 1/085: {Flexible aerials; Whip aerials with a resilient base} - H01Q 1/3241: {particular used in keyless entry systems} - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract The inductor comprises a winding arranged around a core formed by at least two rigid magnetic elements connected in an articulated manner forming an oblong assembly, each comprising: a head end A provided with a circular convex curved surface and a tail end B provided with a circular concave curved configuration, in relation to a transverse axis of the tail, parallel to the transverse axis of the head, and the configuration being complementary to said circular convex curved configuration. The head end A is coupled to the tail end B forming an articulated attachment, and the transverse axes of the head and tail coincide in the coupling area, providing a joint having a variable, adjustable angle, wherein the assembly of said two or more rigid magnetic cores is surrounded by a flexible polymer casing, including magnetic charges that work together to prevent magnetic flux dispersion in the coupling gaps or interstices between the magnetic cores. ## Claims ### Claim 1 A flexible elongated inductor comprising a winding made from a conductive element arranged around a core formed by at least two rigid magnetic cores, made from ferromagnetic material, connected in an articulated manner to one another at their ends, forming an oblong assembly, wherein each of the at least two magnetic cores comprises: a head end A, provided with a circular convex curved surface in relation to a transverse axis of the head; and a tail end B, provided with a circular concave curved configuration in relation to a transverse axis of the tail, parallel to the transverse axis of the head, said circular concave curved configuration being complementary to said circular convex curved configuration, wherein the head end A of one of said magnetic cores is coupled through contact surfaces with the tail end B of an adjacent magnetic core, forming an articulated attachment, wherein said transverse axes of the head and tail of the at least two magnetic cores are coupled to one another coinciding in the coupling area, providing a joint having a variable, adjustable angle, and wherein the oblong assembly of said two or more rigid magnetic cores is surrounded by a flexible polymer casing, including magnetic charges that work together to prevent magnetic flux dispersion in the coupling areas or interstices between said at least two magnetic cores, said flexible polymer casing including microfibers, microparticles and/or nanoparticles of a soft ferromagnetic material present alone or in any combination thereof inside the polymer matrix of said polymer casing, providing said magnetic charges. ### Claim 2 (depends on 1) The flexible elongated inductor according to claim 1, wherein each of the magnetic cores connected in an articulated manner has a rectangular cross section. ### Claim 3 (depends on 1) The flexible elongated inductor according to claim 1, wherein said articulated attachment includes at least one transverse retention configuration formed by a projection and a recess complementary to one another, defined in said head end A and tail end B, respectively, and formed from said ferromagnetic material of the mentioned magnetic cores, preventing said retention configuration from being misaligned in a transverse direction of the magnetic cores coupled to one another. ### Claim 4 (depends on 2) The flexible elongated inductor according to claim 2, wherein said articulated attachment includes at least one transverse retention configuration formed by a projection and a recess complementary to one another, defined in said head end A and tail end B, respectively, and formed from said ferromagnetic material of the mentioned magnetic cores, preventing said retention configuration from being misaligned in a transverse direction of the magnetic cores coupled to one another. ### Claim 5 (depends on 1) The flexible elongated inductor according to claim 1, wherein the flexible elongated inductor has a length greater than 15 cm. ### Claim 6 (depends on 5) The flexible elongated inductor according to claim 5, wherein the flexible elongated inductor has a maximum length of about 60 cm. ### Claim 7 (depends on 3) The flexible elongated inductor according to claim 3, wherein the flexible elongated inductor has a length greater than 15 cm. ### Claim 8 (depends on 7) The flexible elongated inductor according to claim 7, wherein the flexible elongated inductor has a maximum length of about 60 cm. ### Claim 9 (depends on 1) The flexible elongated inductor according to claim 1, wherein said microfibers, microparticles and/or nanoparticles of a soft ferromagnetic material represent about at least 50% of the total weight of the core. ### Claim 10 (depends on 4) The flexible elongated inductor according to claim 4, wherein said magnetic core has a rectangular prismatic configuration, said projection and recess being defined on respective opposing, smaller rectangular faces of both ends A and B of the magnetic core. ### Claim 11 (depends on 10) The flexible elongated inductor according to claim 10, wherein said projection and said recess adopt a central position in relation to the assembly of rigid magnetic cores coupled to one another at their ends A and B. ### Claim 12 (depends on 10) The flexible elongated inductor according to claim 10, wherein said projection and said recess adopt a side position in relation to the assembly of rigid magnetic cores coupled to one another at their ends A and B. ### Claim 13 (depends on 11) The flexible elongated inductor according to claim 11, wherein said projection and said recess have a width being 10% of a largest width of the rectangular prismatic body, or have a width being 60% of the largest width of the rectangular prismatic body. ### Claim 14 (depends on 1) The flexible elongated inductor according to claim 1, wherein the inductor has at least 5 magnetic cores coupled to one another and a total extension providing a sag of 2 cm for a length of 30 cm. ### Claim 15 (depends on 1) An elongated flexible antenna formed by a flexible inductor according to claim 1. ### Claim 16 (depends on 15) The elongated flexible antenna according to claim 15, wherein the winding made from a conductive element comprises a conductive wire or a conductive foil. ### Claim 17 (depends on 16) The elongated flexible antenna according to claim 16, wherein said antenna is an LF antenna operating in a range of frequencies of 20 KHz to 300 Khz.