# US 11,310,908 B2 · Circuit board, inductor, and radio apparatus

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- Number: US 11,310,908 B2
- Document ID: US11310908B2
- Status: Granted
- Kind: B2
- Application number: 16/902,062
- Filed: 2020-06-15
- Published: 2020-12-17
- Granted: 2022-04-19
- Earliest claimed: 2019-06-17
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Murata Manufacturing Co., Ltd.
- Inventors: Masashi Omuro; Yu Ishiwata; Yasuhisa Yamamoto
- Web page: https://patentgrep.com/patent/US11310908B2

## CPC

- H05K 1/0243: {Printed circuits associated with mounted high frequency components}
- H05K 1/0248: {Skew reduction or using delay lines}
- H05K 1/11: Printed elements for providing electric connections to or between printed circuits
- H05K 2201/09218: Conductive traces
- H05K 2201/09281: Layout details of a single conductor
- H05K 2201/09381: Shape of non-curved single flat metallic pad, land or exposed part thereof; Shape of electrode of leadless component
- H05K 2201/1003: Non-printed inductor
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A power supply circuit board includes a substrate, a first line that is provided on a first main surface of the substrate and that has a land, a second line that is provided on the first main surface of the substrate and that has a land, an inductor that is connected to the land of the first line and the land of the second line and that is made of a ferrite material, and an open stub that is connected to at least one of the first line and the second line.

## Claims

### Claim 1

An inductor comprising:
a main body made of a ferrite material;
a line provided in the main body;
a first outer electrode that is provided on the main body and that is connected to a first end portion of the line;
a second outer electrode that is provided on the main body and that is connected to a second end portion of the line; and
an open stub that is positioned in the main body and that is connected to the line, wherein
the line is a coil, and
the open stub is positioned at a portion different than that of the coil in the main body.

### Claim 2 (depends on 1)

The inductor according to claim 1, wherein
the open stub is configured as a via provided in the main body.

### Claim 3 (depends on 2)

The inductor according to claim 2, wherein
an attenuation band of the open stub is higher than an attenuation band of the ferrite material.

### Claim 4 (depends on 2)

The inductor according to claim 2, wherein
an attenuation band of the open stub at least includes a frequency of not less than about 2.4 GHz.

### Claim 5 (depends on 1)

The inductor according to claim 1, wherein
the open stub is configured in a meander pattern.

### Claim 6 (depends on 1)

The inductor according to claim 1, wherein
the open stub is configured as a substantially fan-shaped wiring pattern or a stepwise wiring pattern.

### Claim 7 (depends on 1)

The inductor according to claim 1, wherein
an attenuation band of the open stub is higher than an attenuation band of the ferrite material.

### Claim 8 (depends on 1)

The inductor according to claim 1, wherein
an attenuation band of the open stub at least includes a frequency of not less than about 2.4 GHz.

### Claim 9 (depends on 1)

A radio apparatus comprising the inductor according to claim 1.