# US 8,786,501 B2 · Memory card

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- Number: US 8,786,501 B2
- Document ID: US8786501B2
- Status: Granted
- Kind: B2
- Application number: 13/476,307
- Filed: 2012-05-21
- Published: 2012-12-13
- Granted: 2014-07-22
- Earliest claimed: 2011-06-13
- Assignees: Fujitsu Component Limited
- Applicants: Masahiro Yanagi; Shigemi Kurashima; Hideaki Yoda
- Inventors: Masahiro Yanagi; Shigemi Kurashima; Hideaki Yoda
- Web page: https://patentgrep.com/patent/US8786501B2

## CPC

- H01Q 1/2275: {associated to expansion card or bus, e.g. in PCMCIA, PC cards, Wireless USB}
- H01Q 1/48: Earthing means; Earth screens; Counterpoises
- H01Q 9/42: with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

A disclosed memory card having a built-in antenna and being connected to an electronic apparatus includes a circuit board configured to be covered by a case, an antenna element formed on one surface of the circuit board or on one surface of a board mounted on the circuit board, and a ground element formed on another surface of the circuit board or on another surface of the board mounted on the circuit board, wherein a part or all of the antenna element and a part or all of the ground element are formed to protrude outside the electronic apparatus when the memory card is connected to the electronic apparatus.

## Claims

### Claim 1

A memory card having a built-in antenna, the memory card connectable to an electronic apparatus, the memory card comprising:
a circuit board configured to be covered by a case;
an antenna element formed on one surface of the circuit board or on one surface of a board mounted on the circuit board; and
a ground element formed on another surface of the circuit board or on another surface of the board mounted on the circuit board,
wherein a part or all of the antenna element and a part or all of the ground element are formed to protrude outside the electronic apparatus when the memory card is connected to the electronic apparatus.

### Claim 2 (depends on 1)

The memory card according to claim 1,
wherein the antenna element is formed to be in a L shape and has an antenna element linear portion as a part of the L shape,
the ground element is formed to be in a L shape, and
the antenna element linear portion protrudes outside the electronic apparatus when the memory card is connected to the electronic apparatus.

### Claim 3 (depends on 1)

The memory card according to claim 1,
wherein the circuit board includes the ground element,
the ground element includes a ground area, and
a gap between the antenna element and the ground area is smaller than or equal to 0.05λ, where λ designates a wavelength used by the built-in antenna.

### Claim 4 (depends on 1)

The memory card according to claim 1,
wherein a shape of the antenna element and a shape of the ground element are substantially symmetrical with respect to the circuit board and the board.

### Claim 5 (depends on 1)

The memory card according to claim 1,
wherein the circuit board is a printed-wiring board, and the board is another printed-wiring board.

### Claim 6 (depends on 5)

The memory card according to claim 5,
wherein the printed-wiring board has plural layers, the antenna element is formed on two or more layers of the plural layers and the ground element is formed on two or more layers of the layers on which the antenna element is not formed among the plural layers.

### Claim 7 (depends on 1)

The memory card according to claim 1,
wherein the built-in antenna is used for a frequency band between 2.4 GHz to 2.5 GHz.

### Claim 8 (depends on 1)

The memory card according to claim 1,
wherein the built-in antenna is used for communications for a wireless LAN or Bluetooth (“Bluetooth” is a registered trademark).

### Claim 9

A memory card having a built-in antenna, the memory card connectable to an electronic apparatus, the memory card comprising:
a circuit board configured to be covered by a case;
an antenna element formed on one surface of the circuit board or on one surface of a board mounted on the circuit board; and
a ground element formed on another surface of the circuit board or on another surface of the board mounted on the circuit board,
wherein a width of the antenna element is smaller than 1 mm, and a width of the ground element is smaller than 1 mm.

### Claim 10 (depends on 9)

The memory card according to claim 9,
wherein the antenna element is formed to be in a L shape, and
the ground element is formed to be in a L shape.

### Claim 11 (depends on 9)

The memory card according to claim 9,
wherein the circuit board includes the ground element,
the ground element includes a ground area, and
a gap between the antenna element and the ground area is smaller than or equal to 0.05λ, where λ designates a wavelength used by the built-in antenna.

### Claim 12 (depends on 9)

The memory card according to claim 9,
wherein a distance from an edge of the circuit board on a side, which is opposite to a connection side of the memory card connected with electronic apparatus, to the antenna element and the ground element is smaller than or equal to 0.5 mm.

### Claim 13 (depends on 9)

The memory card according to claim 9,
wherein a distance from an edge of the circuit board on a side, which is opposite to a connection side of the memory card connected with electronic apparatus, to the antenna element and the ground element is smaller than or equal to 0.5 mm and/or the width of the antenna element is smaller than or equal to 0.5 mm.

### Claim 14 (depends on 9)

The memory card according to claim 9,
wherein a sum of the width of the antenna element and a distance from an edge of the circuit board on a side, which is opposite to a connection side of the memory card connected with electronic apparatus, to the antenna element and the ground element is smaller than or equal to 1.0 mm.

### Claim 15

A memory card having a built-in antenna, the memory card connectable to an electronic apparatus, the memory card comprising:
a circuit board configured to be covered by a case;
an antenna element formed to be in a L shape on one surface of the circuit board or on one surface of a board mounted on the circuit board;
a ground element formed to be in a L shape on another surface of the circuit board or on another surface of the board mounted on the circuit board; and
a ground area provided on the circuit board,
wherein a gap between the antenna element and the ground area is smaller than or equal to 0.05λ where λ designates a wavelength used by the built-in antenna.

### Claim 16 (depends on 15)

The memory card according to claim 15,
wherein
a distance from an edge of the circuit board on a side, which is opposite to a connection side of the memory card connected with electronic apparatus, to the antenna element and the ground element is smaller than or equal to 0.5 mm.