# US 2020/0287286 A1 · Multilayer inductor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0287286 A1 - Document ID: US20200287286A1 - Status: Published application - Kind: A1 - Application number: 16/764,326 - Filed: 2018-11-13 - Published: 2020-09-10 - Earliest claimed: 2017-11-14 - Assignees: Aw Branding Limited - Applicants: Aw Branding Limited - Inventors: Victor THENOT; Jean-Marie VAU; Gaël DEPRES - Web page: https://patentgrep.com/patent/US20200287286A1 ## CPC - H01Q 7/00: Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop - H01F 17/0013: {with stacked layers} - H01F 41/045: {Trimming} - H01F 2017/004: {with the coil helically wound around an axis without a core} - 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 invention provides an inductor (1) comprising at least one first conductive layer (4a) comprising at least one first turn (5) of conductive material and at least one second conductive layer (4b) comprising at least one second turn (5) of conductive material, at least one conductive bridge (7) connecting the first and second turns (5), a layer of insulating material (6a) being interposed at least partially between the first and second turns (5), the first and second turns (5) being at least partially superimposed in the stacking direction (Z) of said layers (4a, 4b, 6a), characterized in that, in the area of superimposition of said turns, the width (I1) of the section of the first turn (5, 4a) is greater than the width (I2) of the section of the second turn (5, 4b). ## Claims ### Claim 1 An inductor (1) comprising at least one first conductive layer (4a) comprising at least one first turn (5) of conductive material and at least one second conductive layer (4b) comprising at least one second turn (5) of conductive material, at least one conductive bridge (7) connecting the first and second turns (5), a layer of insulating material (6a) being interposed at least partially between the first and second turns (5), the first and second turns (5) being superimposed at least partly in the stacking direction (Z) of said layers (4a, 4b, 6a), characterized in that, in the area of superimposition of said turns, the width (I1) of the section of the first turn (5), 4a) is greater than the width (I2) of the section of the second turn (5, 4b), one of the conductive layers (4a, 4b) being formed on a substrate (3) made of paper, synthetic paper, polyethylene terephthalate, polyethylene naphthalate or polyimide. ### Claim 2 (depends on 1) Inductor (1) according to claim 1, characterised in that the difference in width between the corresponding sections of two turns (5) of two consecutive layers (4a, 4b) is between 50 and 500 μm, preferably between 100 and 300 μm. ### Claim 3 (depends on 1, 2) Inductor (1) according to claim 1 or 2, characterized in that each conductive layer (4a, 4b) is made with a conductive ink. ### Claim 4 (depends on 3) Inductor (1) according to claim 3, characterized in that the conductive ink is selected from the following inks: a carbon-based ink, e.g. based on graphite or graphene, carbon nanotubes (CNT), an ink based on a conductive polymeric material, for example polyaniline, poly(3,4-ethylenedioxythiophene), more commonly known as PEDOT, polythiophenes or polypyrrole, an ink based on metal, for example metal microparticles or nanoparticles, for example based on silver, copper, nickel, platinum, tin or gold, in particular an ink based on silver in the form of microparticles or nanoparticles. ### Claim 5 (depends on 3, 4) Inductor (1) according to claim 3 or 4, characterized in that the conductive ink is deposited by a printing process of the screen, flexographic, rotogravure, offset or inkjet type. ### Claim 6 (depends on 1, 2, 3, 4, 5) Inductor (1) according to one of claims 1 to 5, characterized in that the insulating layer (6a) is made with a UV dielectric ink. ### Claim 7 (depends on 1, 2, 3, 4, 5, 6) Radio identification transponder (2) characterized in that it comprises an inductor (1) according to one of claims 1 to 6 forming an antenna (1), and a chip or printed circuit (9) connected to the antenna (1). ### Claim 8 (depends on 1, 2, 3, 4, 5, 6) Method for manufacturing an inductor (1) according to one of claims 1 to 6, characterised in that it includes the following steps: forming at least a first conductive layer (4a) comprising at least a first turn (5) of conductive material, forming a layer of insulating material (6a) on at least part of the first conductive layer (4a), forming at least one second conductive layer (4b) comprising at least one second turn (5) of conductive material, on the layer of insulating material (6a) and/or on the first layer (4a), the first and second turns (5) being superimposed at least partly in the stacking direction (Z) of said layers, the turns (5) being dimensioned and positioned in such a way that, in the region of superimposition of said turns (5), the width of the section (I1) of the first turn (5, 4a) is greater than the width (I2) of the section of the second turn (5, 4b), and in such a way that the turns (5) are connected by at least one conductive bridge (7). ### Claim 9 (depends on 8) Method according to claim 8, characterized in that the steps of forming the conductive layers (4a, 4b) are carried out by printing with a conductive ink. ### Claim 10 (depends on 9) Method according to claim 9, characterized in that it comprises at least one step of annealing at least one of the conductive layers (4a, 4b).