# US 9,882,267 B2 · Antenna device and communication terminal device

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- Number: US 9,882,267 B2
- Document ID: US9882267B2
- Status: Granted
- Kind: B2
- Application number: 14/749,879
- Filed: 2015-06-25
- Published: 2015-11-05
- Granted: 2018-01-30
- Earliest claimed: 2012-06-28
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Murata Manufacturing Co., Ltd.
- Inventors: Shinichi Nakano; Kuniaki Yosui; Noboru Kato
- Web page: https://patentgrep.com/patent/US9882267B2

## CPC

- H01Q 1/243: {with built-in antennas}
- G06K 19/07794: {the record carrier comprising a booster or auxiliary antenna in addition to the antenna connected directly to the integrated circuit}
- H01Q 1/48: Earthing means; Earth screens; Counterpoises
- H01Q 1/521: {reducing the coupling between adjacent antennas}
- 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 9/0407: {Substantially flat resonant element parallel to ground plane, e.g. patch antenna (dipole H01Q9/285; monopole H01Q9/40)}
- H01Q 9/045: {with particular feeding means (for circular polarisation H01Q9/0428)}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS

## Abstract

An antenna device includes a first conductor plane and a second conductor plane that face each other. The first conductor plane and the second conductor plane are electrically continuous through a first connection conductor, a second connection conductor, and a chip capacitor. A power feed coil is disposed between the first conductor plane and the second conductor plane. The power feed coil includes a magnetic core and a coil conductor. The coil conductor defines a pattern such that the coil conductor winds around the magnetic core. The power feed coil is disposed at a position closer to the first connection conductor and magnetically couples with the first connection conductor.

## Claims

### Claim 1

An antenna device incorporated in electronic equipment, the antenna device comprising:
a ground conductor provided in a circuit board in the electronic equipment;
a conductor portion of a casing of the electronic equipment; and
a power feed coil; wherein
the power feed coil is disposed within the casing and on the circuit board of the electronic equipment;
at least two points of the ground conductor are connected to at least two points of the conductor portion of the casing, respectively, such that the ground conductor and the conductor portion of the casing define a looped current path; and
the power feed coil is magnetically coupled to the looped current path.

### Claim 2 (depends on 1)

The antenna device according to claim 1, wherein
the looped current path is included in an LC resonant circuit; and
a resonant frequency of the looped current path is in the HF band and is in a carrier frequency band of communication signals or near the carrier frequency band.