# US 10,374,283 B2 · Coil for antenna and antenna system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,283 B2 - Document ID: US10374283B2 - Status: Granted - Kind: B2 - Application number: 15/374,680 - Filed: 2016-12-09 - Published: 2017-03-30 - Granted: 2019-08-06 - Earliest claimed: 2014-06-24 - Assignees: AGC Inc. - Applicants: Agc Inc. - Inventors: Fumitaka Terashima - Web page: https://patentgrep.com/patent/US10374283B2 ## CPC - H01Q 1/1278: {in association with heating wires or layers} - H01F 5/00: Coils (superconducting coils H01F6/06; fixed inductances of the signal type H01F17/00) - H01F 38/14: Inductive couplings - H01Q 1/3208: {characterised by the application wherein the antenna is used} - H01Q 1/48: Earthing means; Earth screens; Counterpoises - H01Q 7/08: Ferrite rod or like elongated 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 A coil for an antenna includes a ferrite core; and a winding conductor configured to have a conducting wire wound around the ferrite core as a core bar. The winding conductor includes an inner winding positioned inside when viewed from a plane perpendicular to the core bar, and an outer winding positioned outside of the inner winding. A length of the outer winding when viewed from a plane parallel to the core bar is different from a length of the inner winding. ## Claims ### Claim 1 A coil for an antenna, comprising: a ferrite core; and a winding conductor configured to have a conducting wire wound around the ferrite core as a core bar, wherein the winding conductor includes an inner winding positioned inside when viewed from a plane perpendicular to the core bar, and an outer winding positioned outside of the inner winding, wherein a length of the outer winding when viewed from a plane parallel to the core bar is different from a length of the inner winding, wherein the outer winding is the conducting wire continuous with the inner winding, and wherein the coil has an impedance of 4 kΩ or greater with respect to an entire range of an AM band. ### Claim 2 (depends on 1) The coil for the antenna as claimed in claim 1, wherein the length of the outer winding when viewed from the plane parallel to the core bar is shorter than the length of the inner winding. ### Claim 3 (depends on 2) The coil for the antenna as claimed in claim 2, wherein the length of the outer winding is greater than or equal to 50% and less than or equal to 85% of the length of the inner winding. ### Claim 4 (depends on 2) The coil for the antenna as claimed in claim 2, wherein a number of turns of the conducting wire of the outer winding is greater than or equal to 50% and less than or equal to 85% of a number of turns of the conducting wire of the inner winding. ### Claim 5 (depends on 2) The coil for the antenna as claimed in claim 2, wherein the length of the outer winding is in a range from 40% to 90% of the length of the inner winding. ### Claim 6 (depends on 2) The coil for the antenna as claimed in claim 2, wherein the length of the outer winding is in a range from 60% to 80% of the length of the inner winding. ### Claim 7 (depends on 2) The coil for the antenna as claimed in claim 2, wherein the number of turns of the conducting wire of the outer winding is in a range from 40% to 95% of the number of turns of the conducting wire of the inner winding. ### Claim 8 (depends on 2) The coil for the antenna as claimed in claim 2, wherein the number of turns of the conducting wire of the outer winding is in a range from 60% to 80% of the number of turns of the conducting wire of the inner winding. ### Claim 9 (depends on 1) The coil for the antenna as claimed in claim 1, wherein the winding conductor has a start point of the conducting wire at which winding starts, and an end point of the conducting wire at which the winding ends, wherein a distance between the start point and the end point when viewed from the plane parallel to the core bar is in a range from 5% to 60% of a total length of the winding conductor. ### Claim 10 (depends on 9) The coil for the antenna as claimed in claim 9, wherein the distance between the start point and the end point is in a range from 15% to 50% of the total length of the winding conductor. ### Claim 11 (depends on 9) The coil for the antenna as claimed in claim 9, wherein the distance between the start point and the end point is in a range from 20% to 40% of the total length of the winding conductor. ### Claim 12 (depends on 1) An antenna system comprising: a glass antenna for a vehicle configured to be disposed in a window glass plate of the vehicle, and to include a defogger including multiple heater wires, and a pair of bus bars to which terminal parts of the heater wires are connected, an antenna conductor, and a power feeding point for the antenna conductor, in the window glass plate of the vehicle, wherein the defogger is heated up by a current flowing from a power source to a ground through the bus bars and the heater wires, wherein the antenna conductor is electrically connected with the defogger, wherein a coil device is disposed in which the coil for the antenna as claimed in claim 1 is connected between the defogger and the power source, and between the defogger and the ground, respectively. ### Claim 13 (depends on 12) The antenna system as claimed in claim 12, wherein the defogger is partitioned up and down to include a first defogger including first multiple heater wires and a first pair of bus bars, and a second defogger including second multiple heater wires and a second pair of bus bars, wherein the antenna conductor is electrically connected with at least one of the first defogger and the second defogger, wherein the coil device is disposed between both or one of the first defogger and the second defogger electrically connected with the antenna conductor, and the power source and the ground. ### Claim 14 (depends on 1) The coil for the antenna as claimed in claim 1, wherein the conducting wire is further wound on the outside of the outer winding to form the winding conductor having three or more stages. ### Claim 15 (depends on 1) The coil for the antenna as claimed in claim 1, wherein the coil has the impedance of 4.5 kΩ or greater with respect to the entire range of the AM band.