Electronic component, antenna and RF tag

Patent metadata

Field	Value
Publication number	US-11228106-B2
Application number	US-201816481900-A
Country	US
Kind code	B2
Filing date	Jan 29, 2018
Priority date	Jan 31, 2017
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

The present invention relates to an electronic component, and also relates to an antenna for information communication using a magnetic field component, which is capable of satisfying both of downsizing and improvement in communication sensitivity. The electronic component of the present invention comprises a ferrite core and a coil, in which a ferrite constituting the ferrite core has a spinel structure and comprises Fe, Ni, Zn, Cu and Co as constitutional metal elements, and when contents of the respective constitutional metal elements in the ferrite are calculated in terms of Fe 2 O 3 , NiO, ZnO, CuO and CoO, contents of Fe 2 O 3 , NiO, ZnO, CuO and CoO in the ferrite are 46 to 50 mol %, 20 to 27 mol %, 15 to 22 mol %, 9 to 11 mol % and 0.01 to 1.0 mol %, respectively, based on a total content of Fe 2 O 3 , NiO, ZnO, CuO and CoO.

First claim

The invention claimed is:

1. An antenna comprising an electronic component comprising a ferrite core and a coil, in which a ferrite constituting the ferrite core has a spinel structure and integrally consists of Fe, Ni, Zn, Cu and Co as integral constitutional metal elements, and when contents of the respective integral constitutional metal elements in the ferrite are calculated in terms of Fe 2 O 3 , NiO, ZnO, CuO and CoO, contents of Fe 2 O 3 , NiO, ZnO, CuO and CoO in the ferrite are 46 to 50 mol %, 20 to 27 mol %, 15 to 22 mol %, 9 to 11 mol % and 0.01 to 1.0 mol %, respectively, based on a total content of Fe 2 O 3 , NiO, ZnO, CuO and CoO,
wherein a μQ product of the ferrite constituting the ferrite core as measured at 13.56 MHz is not less than 9000, and
wherein CoO is not present as part of a mixture of the ferrite.

2. The antenna according to claim 1 , wherein a molar ratio of Zn to Ni (Zn/Ni) in the ferrite constituting the ferrite core is 0.58 to 1.0.

3. The antenna according to claim 1 , wherein a molar ratio of Ni to Cu (Ni/Cu) in the ferrite constituting the ferrite core is 2.00 to 2.50.

4. The antenna according to claim 1 , wherein Q (μ′/μ″) of the ferrite core which is a ratio of a real part μ′ to an imaginary part μ″ of a complex magnetic permeability of the ferrite constituting the ferrite core as measured at 13.56 MHz is 50 to 170.

5. An RF tag comprising the antenna according to claim 1 to which IC is mounted.

6. The RF tag according to claim 5 which is coated with a resin.

Assignees

• Toda Kogyo Corp

Inventors

• Nomura Satoshi
• Koujima Jun
• Nishio Yasushi
• NAKATSUKASA Manato
• Fujii Yasuhiko

Classifications

• H01Q7/06 Primary

  with core of ferromagnetic material (H01Q7/02 takes precedence) · CPC title

• H01F1/34

  non-metallic substances, e.g. ferrites · CPC title

• G06K19/07775

  the antenna being on-chip · CPC title

• H01F17/00

  Fixed inductances of the signal type {(coils in general H01F5/00)} · CPC title

• H01Q1/2208

  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 title