# US 2013/0154891 A1 · Antenna device and communication terminal device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0154891 A1 - Document ID: US20130154891A1 - Status: Published application - Kind: A1 - Application number: 13/765,512 - Filed: 2013-02-12 - Published: 2013-06-20 - Earliest claimed: 2010-08-12 - Assignees: Murata Manufacturing Co., Ltd. - Inventors: Hiroyuki KUBO; Hiromitsu ITO; Kuniaki YOSUI - Web page: https://patentgrep.com/patent/US20130154891A1 ## CPC - G06K 19/07779: {the inductive antenna being a coil} - G06K 19/0779: {the antenna being foldable or folded} - H01Q 1/243: {with built-in antennas} - H01Q 7/06: with core of ferromagnetic material (H01Q7/02 takes precedence) - H01Q 7/08: Ferrite rod or like elongated core - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract An antenna device or a communication terminal device including the antenna device includes ground conductor, which serves as a plate-shaped conductor and is provided in an inner layer of a circuit board. An antenna coil is mounted so that a first main surface of a magnetic core faces the circuit board. The antenna coil is arranged so that a first conductor portion of a coil conductor is at a position that is closer to the ground conductor than a second conductor portion. The antenna coil is arranged so that the first conductor portion of the coil conductor is positioned in the vicinity of a longitudinal direction end portion of a casing, and the first conductor portion of the coil conductor is bent in a direction toward the ground conductor. ## Claims ### Claim 1 An antenna device comprising: an antenna coil including a magnetic core having a first main surface and a second main surface and a coil conductor wound around the magnetic core, and a planar conductor arranged close to the magnetic core, wherein the coil conductor includes a first conductor portion positioned on a first main surface side of the magnetic core and a second conductor portion positioned on a second main surface side of the magnetic core and arranged at a different position to the first conductor portion when viewed in plan from a direction of the first or second main surface, and wherein the antenna coil is arranged so that the first main surface side of the magnetic core is on the planar conductor side and so that the first conductor portion of the coil conductor is close to an end portion of the planar conductor, and the first conductor portion of the coil conductor is bent in a direction toward the planar conductor. ### Claim 2 (depends on 1) The antenna device according to claim 1, wherein the width of one end of the magnetic core is larger than the width of the remaining portion of the magnetic core. ### Claim 3 (depends on 1) The antenna device according to claim 1, wherein the magnetic core is a mixture of a magnetic powder and a resin molded into a sheet shape, or is a sintered magnetic body that is made into a plurality of small pieces. ### Claim 4 (depends on 1) The antenna device according to claim 1, wherein the planar conductor is a ground electrode that is formed in a circuit board arranged inside a casing and the second conductor portion of the coil conductor is arranged so as to face the planar conductor. ### Claim 5 (depends on 4) The antenna device according to claim 4, wherein the width of one end of the magnetic core is larger than the width of the remaining portion of the magnetic core. ### Claim 6 (depends on 4) The antenna device according to claim 4, wherein the magnetic core is a mixture of a magnetic powder and a resin molded into a sheet shape, or is a sintered magnetic body that is made into a plurality of small pieces. ### Claim 7 (depends on 6) The antenna device according to claim 6, wherein the width of one end of the magnetic core is larger than the width of the remaining portion of the magnetic core. ### Claim 8 (depends on 1) The antenna device according to claim 1, wherein an end portion of the magnetic core, in said plan view, protrudes a predetermined distance from the end portion of the planar conductor. ### Claim 9 (depends on 1) The antenna device according to claim 1, further comprising an insulating support between the antenna coil and the planar conductor. ### Claim 10 A communication terminal device comprising: an antenna coil including a magnetic core having a first main surface and a second main surface and a coil conductor wound around the magnetic core, a planar conductor arranged close to the magnetic core, and a casing that houses the antenna coil and the planar conductor, wherein the coil conductor includes a first conductor portion positioned on a first main surface side of the magnetic core and a second conductor portion positioned on a second main surface side of the magnetic core and arranged at a different position to the first conductor portion when viewed in plan from a direction of the first or second main surface, and wherein the antenna coil is arranged so that the first main surface side of the magnetic core is on the planar conductor side and so that the first conductor portion of the coil conductor is close to an end portion of the planar conductor, and the first conductor portion of the coil conductor is bent in a direction toward the planar conductor. ### Claim 11 (depends on 10) The communication terminal device according to claim 10, wherein the width of one end of the magnetic core is larger than the width of the remaining portion of the magnetic core. ### Claim 12 (depends on 10) The communication terminal device according to claim 10, wherein the magnetic core is a mixture of a magnetic powder and a resin molded into a sheet shape, or is a sintered magnetic body that is made into a plurality of small pieces. ### Claim 13 (depends on 10) The communication terminal device according to claim 10, wherein the planar conductor is a ground electrode that is formed in a circuit board arranged inside a casing and the second conductor portion of the coil conductor is arranged so as to face the planar conductor. ### Claim 14 (depends on 13) The communication terminal device according to claim 13, wherein the width of one end of the magnetic core is larger than the width of the remaining portion of the magnetic core. ### Claim 15 (depends on 13) The communication terminal device according to claim 13, wherein the magnetic core is a mixture of a magnetic powder and a resin molded into a sheet shape, or is a sintered magnetic body that is made into a plurality of small pieces. ### Claim 16 (depends on 15) The communication terminal device according to claim 15, wherein the width of one end of the magnetic core is larger than the width of the remaining portion of the magnetic core. ### Claim 17 (depends on 10) The communication terminal device according to claim 10, wherein an end portion of the magnetic core, in said plan view, protrudes a predetermined distance from the end portion of the planar conductor. ### Claim 18 (depends on 10) The communication terminal device according to claim 10, further comprising an insulating support between the antenna coil and the planar conductor.