# US 10,483,623 B2 · Antenna device and electronic apparatus

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- Number: US 10,483,623 B2
- Document ID: US10483623B2
- Status: Granted
- Kind: B2
- Application number: 15/824,689
- Filed: 2017-11-28
- Published: 2018-03-29
- Granted: 2019-11-19
- Earliest claimed: 2011-11-09
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Murata Manufacturing Co., Ltd.
- Inventors: Hiromitsu Ito
- Web page: https://patentgrep.com/patent/US10483623B2

## CPC

- H01Q 1/243: {with built-in antennas}
- H01Q 1/2225: {used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal}
- H01Q 1/36: Structural form of radiating elements, e.g. cone, spiral, umbrella; {Particular materials used therewith}(H01Q1/08, H01Q1/14 take precedence)
- 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 7/06: with core of ferromagnetic material (H01Q7/02 takes precedence)
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

An antenna device includes an antenna coil, a magnetic sheet, and a metallic member. The antenna coil is formed on a flexible base. The antenna coil is wound into a loop or a spiral in which a winding central portion is a coil opening portion. The magnetic sheet is disposed at a back surface of the flexible base. A square opening is formed in the metallic member. The antenna coil is exposed from the opening of the metallic member. A first side of the antenna coil is hidden by the metallic member and part of the coil opening portion and a second side are exposed from the opening, so that a magnetic flux links with the second side.

## Claims

### Claim 1

An antenna device comprising:
a planar metallic member; and
an antenna coil that is wound into a loop or a spiral,
wherein the metallic member has an opening whose entire periphery is surrounded by a metal,
wherein the antenna coil is disposed on a side of one principal surface of the metallic member such that both of an inner region and an outer region of the antenna coil overlap the opening in a plan view that is in a direction perpendicular to a plane defined by the side of the one principal surface of the metallic member, and
wherein a magnetic sheet is provided on a side of the antenna coil that is opposite to the metallic member.

### Claim 2 (depends on 1)

The antenna device according to claim 1, wherein a hole is formed in the magnetic sheet within a coil opening portion of the antenna coil as viewed in a direction perpendicular to the principal surface of the metallic member.

### Claim 3 (depends on 2)

The antenna device according to claim 2, wherein the antenna coil includes a curved portion.

### Claim 4 (depends on 3)

An electronic apparatus comprising:
the antenna device according to claim 3; and
a housing,
wherein the metallic member is part of the housing.

### Claim 5 (depends on 2)

An electronic apparatus comprising:
the antenna device according to claim 2; and
a housing,
wherein the metallic member is part of the housing.

### Claim 6 (depends on 1)

The antenna device according to claim 1, wherein the antenna coil includes a curved portion.

### Claim 7 (depends on 6)

An electronic apparatus comprising:
the antenna device according to claim 6; and
a housing,
wherein the metallic member is part of the housing.

### Claim 8 (depends on 1)

An electronic apparatus comprising:
the antenna device according to claim 1; and
a housing,
wherein the metallic member is part of the housing.

### Claim 9

An antenna device comprising:
a planar metallic member; and
an antenna coil that is wound into a loop or a spiral, wherein the metallic member has an opening whose entire periphery is surrounded by a metal,
wherein the antenna coil is disposed on a side of one principal surface of the metallic member, and a magnetic sheet is provided on a side of the antenna coil that is opposite to the metallic member, and
wherein the antenna coil is disposed such that a magnetic flux that enters from a side of the other principal surface of the metallic member via the opening and that exits from the side of the one principal surface of the metallic member towards the side of the other principal surface via the opening links with the antenna coil.

### Claim 10 (depends on 9)

The antenna device according to claim 9, wherein a hole is formed in the magnetic sheet within a coil opening portion of the antenna coil as viewed in a direction perpendicular to the principal surface of the metallic member.

### Claim 11 (depends on 10)

The antenna device according to claim 10, wherein the antenna coil includes a curved portion.

### Claim 12 (depends on 11)

An electronic apparatus comprising:
the antenna device according to claim 11; and
a housing,
wherein the metallic member is part of the housing.

### Claim 13 (depends on 10)

An electronic apparatus comprising:
the antenna device according to claim 10; and
a housing,
wherein the metallic member is part of the housing.

### Claim 14 (depends on 9)

The antenna device according to claim 9, wherein the antenna coil includes a curved portion.

### Claim 15 (depends on 14)

An electronic apparatus comprising:
the antenna device according to claim 14; and
a housing,
wherein the metallic member is part of the housing.

### Claim 16 (depends on 9)

An electronic apparatus comprising:
the antenna device according to claim 9; and
a housing,
wherein the metallic member is part of the housing.