Antenna device and communication apparatus

• US 10,644,402 B2
• Filed: 02/01/2018
• Issued: 05/05/2020
• Est. Priority Date: 07/16/2013
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Yosui, Kuniaki, Yazaki, Hirokazu
• Primary Examiner(s): Smith, Graham P
• Assistant Examiner(s): Maldonado, Noel
• Application Number:
  US15/885,853
• Publication Number:
  US 20180159223A1
• Time in Patent Office: 824 Days
• CPC Class Codes: H01Q 1/2208 associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: H01Q 1/523 between antennas of an array
• CPC Class Codes: H01Q 21/08 the units being spaced along or adjacent to a rectilinear path waveguide fed H01Q21/0037
• CPC Class Codes: H01Q 7/06 with core of ferromagnetic material H01Q7/02 takes precedence

Abstract

An antenna device includes a power supply coil including wire patterns provided on or in magnetic layers and antenna coils including wire patterns provided on or in the magnetic layers. The power supply coil and the antenna coils include coil winding axes thereof coinciding with a lamination direction of the magnetic layers and generate magnetic field coupling to each other. The power supply coil is located on an inner side portion relative to the antenna coils when seen in the lamination direction. At least portions of the antenna coils are located on outer side portions relative to the power supply coil in the lamination direction. With this, an antenna device and a communication apparatus capable of communicating with a communication party reliably without forming an unnecessary communication path with a party-side coil are provided.

Claims

1. An antenna device comprising:

a laminated body including magnetic layers;

a power supply coil provided on one or more of the magnetic layers; and

an antenna coil that is provided on one or more of the magnetic layers and that generates magnetic field coupling to the power supply coil;

wherein

the power supply coil is located on an inner portion of the antenna coil when seen in a winding axis direction of the power supply coil.

2. The antenna device according to claim 1, wherein the power supply coil and the antenna coil are provided over a plurality of layers of the magnetic layers.

3. The antenna device according to claim 1, wherein a portion of the power supply coil is provided on a same layer of the magnetic layers as the antenna coil.

4. The antenna device according to claim 1, further comprising a capacitor which is connected to the antenna coil.

5. A communication apparatus comprising:

the antenna device according to claim 1.