# US 10,122,065 B2 · Antenna device, card information medium, electronic apparatus, and method for manufacturing antenna device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,065 B2 - Document ID: US10122065B2 - Status: Granted - Kind: B2 - Application number: 15/652,284 - Filed: 2017-07-18 - Published: 2017-11-02 - Granted: 2018-11-06 - Earliest claimed: 2015-04-08 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Nobuyuki Tenno - Web page: https://patentgrep.com/patent/US10122065B2 ## CPC - H01Q 1/22: by structural association with other equipment or articles - G06K 19/07773: {Antenna details (antennas for wireless devices, e.g. RFID tags, in general H01Q1/22)} - G06K 19/07779: {the inductive antenna being a coil} - H01F 5/003: {Printed circuit coils} - H01Q 1/2275: {associated to expansion card or bus, e.g. in PCMCIA, PC cards, Wireless USB} - 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 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 - H01Q 1/243: {with built-in antennas} - H01Q 1/273: {Adaptation for carrying or wearing by persons or animals} - 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 - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract An antenna device includes a coil including first linear conductors on a first principal surface side of a multilayer body, second linear conductors on a second principal surface side, first end-surface conductors and second end-surface conductors disposed on end surfaces. Each of the first linear conductors includes a first main portion, a first end portion, and a second end portion. Each of the second linear conductors includes a second main portion, a third end portion, and a fourth end portion. The width of each of the first end-surface conductors is smaller than the width of the first main portion and the width of the second main portion. The width of each of the second end-surface conductors is smaller than the width of the first main portion and the width of the second main portion. ## Claims ### Claim 1 An antenna device comprising: a multilayer body including a plurality of insulating layers laminated in a lamination direction; and a coil including a plurality of linear conductors and end-surface conductors, each of the linear conductors being disposed on a surface of the insulating layers and including two end portions and a main portion connecting the two end portions, the two end portions being positioned on outer edges of the insulating layers; each of the end-surface conductors being disposed on an end surface parallel or substantially parallel to the lamination direction, the end-surface conductor connecting the two end portions in the linear conductors in the lamination direction; wherein a width of the end-surface conductor is smaller than a width of the main portion, and an interval between the end-surface conductors adjacent to each other is wider than an interval between the main portions being next to each other in a direction parallel or substantially parallel with respect to the surfaces of the insulating layers and the end surface of the multilayer body. ### Claim 2 (depends on 1) The antenna device according to claim 1, wherein in the direction parallel or substantially parallel with respect to the surfaces of the insulating layers and the end surface of the multilayer body, a line width of each of the two end portions is smaller than a line width of the main portion. ### Claim 3 (depends on 2) The antenna device according to claim 2, wherein each of the two end portions has a line width that gradually decreases as a distance from the main portion increases. ### Claim 4 (depends on 2) The antenna device according to claim 2, wherein in each of the two end portions, a line width of a portion that is adjacent to the main portion is larger than a line width of a portion that is remote from the main portion. ### Claim 5 (depends on 1) The antenna device according to claim 1, wherein a width of a connection portion between the end-surface conductor and each of the two end portions differs from the line width of the end-surface conductor. ### Claim 6 (depends on 5) The antenna device according to claim 5, wherein the connection portion between the end-surface conductor and each of the two end portions is located inside the edges of the insulating layers. ### Claim 7 (depends on 1) The antenna device according to claim 1, wherein the end-surface conductor includes a plurality of interlayer connection conductors linked together. ### Claim 8 (depends on 7) The antenna device according to claim 7, wherein each of the interlayer connection conductors has a circular or oval cross-sectional shape. ### Claim 9 A card information medium comprising: an antenna; and a memory; wherein the antenna includes: a multilayer body including a plurality of insulating layers laminated in a lamination direction; and a coil including a plurality of linear conductors and end-surface conductors, each of the linear conductors being disposed on a surface of the insulating layers and including two end portions and a main portion connecting the two end portion, the two end portions being positioned on outer edges of the insulating layers, each of the end-surface conductors being disposed on an end surface parallel or substantially parallel to the lamination direction, the end-surface conductor connecting the two end portions in the linear conductors in the lamination direction; and a width of the end-surface conductor is smaller than a width of the main portion, and an interval between the end-surface conductors adjacent to each other is wider than an interval between the main portions being next to each other in a direction parallel or substantially parallel with respect to the surfaces of the insulating layers and the end surface of the multilayer body. ### Claim 10 An electronic apparatus comprising: an antenna; and a casing that houses the antenna; wherein the antenna includes: a multilayer body including a plurality of insulating layers laminated in a lamination direction; and a coil including a plurality of linear conductors and end-surface conductors, each of the linear conductors being disposed on a surface of the insulating layers and including two end portions and a main portion connecting the two end portion, the two end portions being positioned on outer edges of the insulating layers, each of the end-surface conductors being disposed on an end surface parallel or substantially parallel to a lamination direction in which the insulating layers are laminated in the multilayer body, the end-surface conductor connecting the two end portions in the linear conductors in the lamination direction; and parallel or substantially parallel to a width of the end-surface conductor is smaller than a width of the main portion, and an interval between the end-surface conductors adjacent to each other is wider than an interval between the main portions being next to each other in a direction parallel or substantially parallel with respect to the surface of the insulating layers and the end surface of the multilayer body. ### Claim 11 A method for manufacturing an antenna device, the antenna device including: a multilayer body including a plurality of insulating layers laminated in lamination direction; and a coil including a plurality of linear conductors and end-surface conductors, each of the linear conductors being disposed on a surface of the insulating layers and including two end portions and a main portion connecting the two end portion, the two end portions being positioned on outer edges of the insulating layers, each of the end-surface conductors being disposed on an end surface parallel or substantially parallel to a lamination direction in which the insulating layers are laminated in the multilayer body, the end-surface conductor connecting the two end portions in the linear conductors in the lamination direction; the method comprising the steps of: forming a paste pattern corresponding to the plurality of linear conductors on the insulating layers; forming through holes in the plurality of insulating layers and filling the through holes with conductive paste for the end-surface conductors; laminating the plurality of insulating layers and firing them; and cutting the multilayer body along a line passing through the plurality of end-surface conductor; wherein a width of each of the end-surface conductors is smaller than a width of the main portions. ### Claim 12 (depends on 1) The antenna device according to claim 1, further comprising outer connection electrodes disposed on a principal surface of the multilayer body, the outer connection electrodes being electrically connected to ends of the coil. ### Claim 13 (depends on 9) The card information medium according to claim 9, further comprising outer connection electrodes disposed on a principal surface of the multilayer body, the outer connection electrodes being electrically connected to ends of the coil. ### Claim 14 (depends on 10) The electronic apparatus according to claim 10, further comprising outer connection electrodes disposed on a principal surface of the multilayer body, the outer connection electrodes being electrically connected to ends of the coil. ### Claim 15 (depends on 11) The method for manufacturing an antenna device according to claim 11, further comprising a step of forming outer connection electrodes on a principal surface of the multilayer body, the outer connection electrodes being electrically connected to ends of the coil. ### Claim 16 (depends on 1) The antenna device according to claim 1, wherein the linear conductors on one of the insulating layers are angled in a direction different from a direction in which the linear conductors on another one of the insulating layers are angled. ### Claim 17 (depends on 9) The card information medium according to claim 9, wherein the linear conductors on one of the insulating layers are angled in a direction different from a direction in which the linear conductors on another one of the insulating layers are angled. ### Claim 18 (depends on 10) The electronic apparatus according to claim 10, wherein the linear conductors on one of the insulating layers are angled in a direction different from a direction in which the linear conductors on another one of the insulating layers are angled. ### Claim 19 (depends on 11) The method for manufacturing an antenna device according to claim 11, wherein the linear conductors on one of the insulating layers are angled in a direction different from a direction in which the linear conductors on another one of the insulating layers are angled. ### Claim 20 (depends on 9) The card information medium according to claim 9, wherein the end-surface conductor includes a plurality of interlayer connection conductors linked together.