Antenna apparatus and communication terminal

Patent metadata

Field	Value
Publication number	US-9595749-B2
Application number	US-201213558747-A
Country	US
Kind code	B2
Filing date	Jul 26, 2012
Priority date	Apr 12, 2010
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

An antenna apparatus includes a power supply coil, a booster electrode sheet, a magnetic sheet, and a ground substrate arranged in this order from the top. The power supply coil includes a spiral coil conductor located on a flexible substrate. The booster electrode sheet includes a booster electrode located on an insulating substrate. The booster electrode includes a conductor region covering the coil conductor, a conductor aperture covering a coil window, and a slit portion connecting the outer edge of the conductor region and the conductor aperture in plan view. The magnetic sheet covers the booster electrode sheet so that the magnetic sheet covers a region slightly larger than a region including the conductor aperture and the slit portion of the booster electrode.

First claim

What is claimed is:

1. An antenna apparatus comprising:
a power supply coil including a loop or spiral coil conductor including a coil window at a winding center;
a booster electrode that faces the power supply coil and includes a conductor aperture and a slit portion connected to the conductor aperture;
a conductor layer facing the power supply coil or the booster electrode; and
a magnetic layer disposed between the power supply coil or the booster electrode and the conductor layer; wherein
the booster electrode includes a region that does not cover the magnetic layer in a plan view of the power supply coil, the booster electrode, the conductor layer, and the magnetic layer;
the booster electrode includes a portion that protrudes outside of an outer periphery of the magnetic layer in the plan view of the power supply coil, the booster electrode, the conductor layer, and the magnetic layer; and
an induced current flowing in the same direction as that of a current flowing around the booster electrode is generated at the conductor layer.

2. The antenna apparatus according to claim 1 , wherein the magnetic layer covers the conductor aperture and the slit portion of the booster electrode in the plan view of the power supply coil, the booster electrode, the conductor layer, and the magnetic layer.

3. The antenna apparatus according to claim 1 , wherein the magnetic layer protrudes from the booster electrode in an extension direction from the conductor aperture to the slit portion of the booster electrode in the plan view of the power supply coil, the booster electrode, the conductor layer, and the magnetic layer.

4. The antenna apparatus according to claim 1 , wherein the magnetic layer extends to an outer edge of the conductor layer or a position spaced apart from the outer edge of the conductor layer in the extension direction from the conductor aperture to the slit portion of the booster electrode in the plan view of the power supply coil, the booster electrode, the conductor layer, and the magnetic layer.

5. The antenna apparatus according to claim 1 , wherein the power supply coil, the booster electrode, the magnetic layer, and the conductor layer are arranged in order from top to bottom.

6. The antenna apparatus according to claim 1 , wherein the power supply coil and the booster electrode are coupled to each other via an electromagnetic field or a magnetic field, and the booster electrode and the conductor layer are coupled to each other via an electromagnetic field or a magnetic field.

7. The antenna apparatus according to claim 1 , wherein the power supply coil and the conductor layer are coupled to each other via an electromagnetic field or a magnetic field.

8. A communication terminal comprising an antenna apparatus including:
a power supply coil including a loop or spiral coil conductor including a coil window at a winding center;
a booster electrode that faces the power supply coil and includes a conductor aperture and a slit portion connected to the conductor aperture;
a conductor layer facing the power supply coil or the booster electrode; and
a magnetic layer disposed between the power supply coil or the booster electrode and the conductor layer; wherein
the booster electrode includes a region that does not cover the magnetic layer in a plan view of the power supply coil, the booster electrode, the conductor layer, and the magnetic layer;
the booster electrode includes a portion that protrudes outside of an outer periphery of the magnetic layer in the plan view of the power supply coil, the booster electrode, the conductor layer, and the magnetic layer; and
an induced current flowing in the same direction as that of a current flowing around the booster electrode is generated at the conductor layer.

Assignees

• Yosui Kuniaki
• Kato Noboru
• Murata Manufacturing Co

Inventors

• Yosui Kuniaki
• Kato Noboru

Classifications

• H01Q7/00 Primary

  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

• H01Q7/06

  with core of ferromagnetic material (H01Q7/02 takes precedence) · CPC title

• H01Q1/2208 Primary

  associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems (methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00) · CPC title

• H01Q1/38

  formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface  H01Q15/142)} · CPC title

• H01Q1/2216 Primary

  used in interrogator/reader equipment · CPC title