ANTENNA APPARATUS AND COMMUNICATION TERMINAL

• US 20120306714A1
• Filed: 07/26/2012
• Published: 12/06/2012
• Est. Priority Date: 04/12/2010
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: YOSUI, Kuniaki, KATO, Noboru
• Granted Patent: US 9,595,749 B2
• Time in Patent Office: Days
• US Class Current: 343/788
• CPC Class Codes: G06K 19/07777 the antenna being of the inductive type
• CPC Class Codes: H01Q 1/2208 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 Class Codes: H01Q 1/2216 used in interrogator/reader equipment
• CPC Class Codes: H01Q 1/2291 used in bluetooth or WI-FI devices of Wireless Local Area Networks [WLAN] H01Q1/241 takes precedence; WLAN in general H04W
• CPC Class Codes: H01Q 1/38 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 Class Codes: 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
• CPC Class Codes: H01Q 7/06 with core of ferromagnetic material H01Q7/02 takes precedence
• CPC Class Codes: H04B 5/0037 for power transfer
• CPC Class Codes: H04B 5/0081 with antenna coils loop aerials H01Q7/00
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

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.

Claims

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.

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 disposed in this order so as to face one another.

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 magnetic layer covers the conductor aperture and the slit portion of the booster electrode in a plan view of the power supply coil, the booster electrode, the conductor layer, and the magnetic layer.