# US 2013/0154388 A1 · Antenna device and mobile communication terminal

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- Number: US 2013/0154388 A1
- Document ID: US20130154388A1
- Status: Published application
- Kind: A1
- Application number: 13/767,960
- Filed: 2013-02-15
- Published: 2013-06-20
- Earliest claimed: 2009-11-20
- Assignees: Murata Manufacturing Co., Ltd.
- Inventors: Noboru KATO; Jun SASAKI; Teppei MIURA
- Web page: https://patentgrep.com/patent/US20130154388A1

## CPC

- H04B 5/70: specially adapted for specific purposes
- G06K 19/07749: {the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card}
- G06K 19/07756: {the connection being non-galvanic, e.g. capacitive}
- G06K 19/07786: {the antenna being of the HF type, such as a dipole}
- 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 1/40: Radiating elements coated with or embedded in protective material
- 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 13/10: Resonant slot antennas
- H04B: TRANSMISSION
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

An antenna device includes a feeding member including a coil pattern and an emitting member to emit a transmit signal supplied from the feeding member and to receive a receive signal and supplying it to the feeding member. The emitting member includes an opening portion and a slit portion communicating with the opening portion. When seen in plan view from the direction of the winding axis of the coil pattern, the opening portion of the emitting member and the inner region of the coil pattern overlap each other, and the emitting member and the coil pattern overlap each other at least partially.

## Claims

### Claim 1

An antenna device comprising:
a feeding member including a coil pattern;
an emitting member magnetically coupled to the coil pattern and arranged to emit a transmit signal supplied from the feeding member and/or to receive a receive signal and supply the receive signal to the feeding member; and
a conductor member that is opposed to the emitting member; wherein
the emitting member includes a slit portion, and the emitting member and the conductor member are capacitively coupled to each other on both sides of the slit portion.

### Claim 2 (depends on 1)

The antenna device according to claim 1, wherein the emitting member and the conductor member are capacitively coupled to each other via a capacitance assisting element.