ANTENNA APPARATUS - MURATA MANUFACTURING CO

Title:

ANTENNA APPARATUS

Document Type and Number:

WIPO Patent Application WO/2010/122888

Kind Code:

A1

Abstract:

An antenna apparatus which is capable of stable communication even when the size of said antenna apparatus is relatively smaller than the antenna of another party being communicated with, and even when two communicating antennas are disposed in close proximity on the same axis, and which is further designed so that the maximum possible distance of communication can be increased. To achieve such an apparatus, the coil window (CW) of an antenna coil module (3) at least partially overlaps the conductor aperture (CA) of a conductor layer (2). Magnetic flux (MF) passing through the coil window (CW) will pass through the conductor aperture (CA). However, the magnetic flux cannot pass through the conductor layer (2), so the magnetic flux (MF) will divert to a path which passes the conductor aperture (CA) of the conductor layer (2) as the inside and the outer edges of the conductor layer (2) as the outside. As a result, the magnetic flux (MF) passing through the coil window (CW) of the antenna coil module (3) takes the shape of a relatively large loop and interlinks inside and outside of the coil conductor (41) of a reader/writer side antenna (4).

Inventors:

KATO NOBORU (JP)
TANIGUCHI KATSUMI (JP)
SASAKI JUN (JP)
GOUCHI NAOKI (JP)

Application Number:

PCT/JP2010/056003

Publication Date:

October 28, 2010

Filing Date:

April 01, 2010

Export Citation:

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Assignee:

MURATA MANUFACTURING CO (JP)
KATO NOBORU (JP)
TANIGUCHI KATSUMI (JP)
SASAKI JUN (JP)
GOUCHI NAOKI (JP)

International Classes:

H01Q7/00; H01Q1/38

Domestic Patent References:

WO2007138857A1

2007-12-06

Foreign References:

JP2009044715A	2009-02-26
JP2003331250A	2003-11-21
JP2008097473A	2008-04-24

Other References: