Antenna device and communication terminal device

Patent metadata

Field	Value
Publication number	US-9882267-B2
Application number	US-201514749879-A
Country	US
Kind code	B2
Filing date	Jun 25, 2015
Priority date	Jun 28, 2012
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

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.

First claim

What is claimed is:

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.

2. 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.

Assignees

• Murata Manufacturing Co

Inventors

• Nakano Shinichi
• Yosui Kuniaki
• Kato Noboru

Classifications

• H01Q9/045

  with particular feeding means (for circular polarisation H01Q9/0428) · CPC title

• H01Q7/00

  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 · CPC title

• H01Q9/0407

  Substantially flat resonant element parallel to ground plane, e.g. patch antenna (dipole H01Q9/285; monopole H01Q9/40) · CPC title

• H01Q1/48

  Earthing means; Earth screens; Counterpoises · CPC title

• H01Q1/243 Primary

  with built-in antennas · CPC title