# US 2014/0191916 A1 · Antenna device and electronic apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0191916 A1 - Document ID: US20140191916A1 - Status: Published application - Kind: A1 - Application number: 14/207,335 - Filed: 2014-03-12 - Published: 2014-07-10 - Earliest claimed: 2011-10-07 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Hiromitsu ITO - Web page: https://patentgrep.com/patent/US20140191916A1 ## CPC - H01Q 7/06: with core of ferromagnetic material (H01Q7/02 takes precedence) - G06K 19/07771: {the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object} - H01Q 1/2216: {used in interrogator/reader equipment} - H01Q 1/38: formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142)} - H01Q 1/48: Earthing means; Earth screens; Counterpoises - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS ## Abstract An antenna device includes an antenna coil, a magnetic core, and a metal member. The antenna coil is mounted on a flexible base. The antenna coil is wound in a loop shape or a spiral shape such that its winding center section is a coil opening section. The magnetic core passes through a slit opening section in the flexible base. The metal member has a rectangular opening. The antenna coil is exposed through the opening in the metal member. A front-side coil conductor is nearer the opening than the magnetic core, and thus a magnetic flux links the front-side coil conductor. ## Claims ### Claim 1 An antenna device comprising: an antenna coil; a magnetic core; and a metal member, the antenna coil being wound in a loop shape or a spiral shape along the magnetic core such that a winding center section thereof is a coil opening section, the magnetic core passing through the coil opening section, the metal member having an opening, and part or all of a portion of the antenna coil being exposed through the opening in the metal member, the portion being nearer the metal member than the magnetic core. ### Claim 2 (depends on 1) The antenna device according to claim 1, wherein the winding center section of the antenna coil is displaced from a center of the opening in the metal member in a direction in which the portion of the antenna coil being nearer the metal member than the magnetic core approaches the center of the opening. ### Claim 3 (depends on 2) The antenna device according to claim 2, wherein the magnetic core has an outer shape extending along the opening in the metal member. ### Claim 4 (depends on 1) The antenna device according to claim 1, wherein, when seen in a direction perpendicular to the opening in the metal member, the magnetic core extends to a region defined between an outer edge of the portion of the antenna coil being nearer the metal member than the magnetic core and an inner edge of the metal member, the inner edge defining the opening. ### Claim 5 (depends on 1) The antenna device according to claim 1, wherein a portion of the antenna coil, the portion being parallel to a direction through which the magnetic core passes, is positioned outside the opening. ### Claim 6 (depends on 1) The antenna device according to claim 1, wherein another metal member, different from the metal member, is not disposed on a surface of each of the antenna coil and the magnetic core, the surface being opposite the metal member. ### Claim 7 (depends on 1) The antenna device according to claim 1, wherein the magnetic core has a hole inside the coil opening section when seen from a direction perpendicular to the opening in the metal member. ### Claim 8 (depends on 1) The antenna device according to claim 1, wherein the antenna coil includes a curved section that overlaps the opening in the metal member when seen from a direction perpendicular to the opening in the metal member. ### Claim 9 (depends on 1) The antenna device according to claim 1, wherein the opening in the metal member has two perpendicular axes in a planar direction in an opening plane thereof, and the winding center section of the antenna coil is displaced from the center of the opening along both the two axes. ### Claim 10 (depends on 1) The antenna device according to claim 1, further comprising: an excitation coil electromagnetic-field coupled to the antenna coil, wherein the antenna coil constitutes at least part of a resonant circuit. ### Claim 11 (depends on 1) An electronic apparatus comprising: the antenna device according to claim 1, wherein the metal member is part of a casing.