# US 10,122,086 B2 · Antenna device and communication apparatus

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- Number: US 10,122,086 B2
- Document ID: US10122086B2
- Status: Granted
- Kind: B2
- Application number: 15/585,439
- Filed: 2017-05-03
- Published: 2017-08-17
- Granted: 2018-11-06
- Earliest claimed: 2014-11-14
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Murata Manufacturing Co., Ltd.
- Inventors: Katsuhito Kuroda; Kengo Onaka
- Web page: https://patentgrep.com/patent/US10122086B2

## CPC

- H01Q 5/321: within a radiating element or between connected radiating elements
- H01Q 1/242: {specially adapted for hand-held use}
- H01Q 5/328: between a radiating element and ground
- H01Q 5/335: at the feed, e.g. for impedance matching
- H01Q 5/371: Branching current paths
- H01Q 9/145: {by varying the electrical length}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

In an antenna device including a high-band antenna element and a low-band antenna element that are connected to a common feed point and feeding electric power using one feed point, influence by unnecessary resonance of the low-band antenna element in a high band is suppressed. The antenna device includes a high-band antenna element and a low-band antenna element that are connected to a common feed point, an antenna-shortening inductor that is connected to between the low-band antenna element and the feed point, and a capacitor that is connected to the antenna-shortening inductor in parallel.

## Claims

### Claim 1

An antenna device comprising:
a high-band antenna element and a low-band antenna element that are connected to a common feed point;
an antenna-shortening inductor that is connected between the low-band antenna element and the feed point; and
a capacitor that is connected to the antenna-shortening inductor in parallel.

### Claim 2 (depends on 1)

The antenna device according to claim 1, including a ground conductor extended in a planar manner,
wherein the high-band antenna element and the low-band antenna element are formed in a non-ground region at an edge of the ground conductor.

### Claim 3 (depends on 2)

The antenna device according to claim 2,
wherein the antenna-shortening inductor comprises a plurality of inductors connected in series and a switch that switches a current path to the plurality of inductors.

### Claim 4 (depends on 2)

A communication apparatus comprising:
an antenna device; and
a communication circuit that is connected to the antenna device,
wherein the antenna device is the antenna device according to claim 2.

### Claim 5 (depends on 1)

The antenna device according to claim 1,
wherein the antenna-shortening inductor comprises a plurality of inductors connected in series and a switch that switches a current path to the plurality of inductors.

### Claim 6 (depends on 5)

The antenna device according to claim 5,
wherein the switch comprises at least a part of the capacitor.

### Claim 7 (depends on 6)

The antenna device according to claim 6,
wherein the plurality of inductors are arranged in a meander form.

### Claim 8 (depends on 6)

The antenna device according to claim 6,
wherein the plurality of inductors are arranged in a helical form.

### Claim 9 (depends on 6)

A communication apparatus comprising:
an antenna device; and
a communication circuit that is connected to the antenna device,
wherein the antenna device is the antenna device according to claim 6.

### Claim 10 (depends on 5)

The antenna device according to claim 5,
wherein the plurality of inductors are arranged in a meander form.

### Claim 11 (depends on 10)

A communication apparatus comprising:
an antenna device; and
a communication circuit that is connected to the antenna device,
wherein the antenna device is the antenna device according to claim 10.

### Claim 12 (depends on 5)

The antenna device according to claim 5,
wherein the plurality of inductors are arranged in a helical form.

### Claim 13 (depends on 12)

A communication apparatus comprising:
an antenna device; and
a communication circuit that is connected to the antenna device,
wherein the antenna device is the antenna device according to claim 12.

### Claim 14 (depends on 5)

A communication apparatus comprising:
an antenna device; and
a communication circuit that is connected to the antenna device,
wherein the antenna device is the antenna device according to claim 5.

### Claim 15 (depends on 1)

A communication apparatus comprising:
an antenna device; and
a communication circuit that is connected to the antenna device,
wherein the antenna device is the antenna device according to claim 1.