ANTENNA DEVICE AND COMMUNICATION DEVICE - SONY CHEM & INF DEVICE CORP

Title:

ANTENNA DEVICE AND COMMUNICATION DEVICE

Document Type and Number:

WIPO Patent Application WO/2011/013662

Kind Code:

A1

Abstract:

Disclosed is an antenna device which is capable of stably communicating, even if the temperature changes, by maintaining a substantially constant resonance frequency. The disclosed device is provided with: an antenna coil (11a) for receiving a magnetic field transmitted from a reader/writer (2); an antenna circuit (11), comprising a capacitor (11b); and a magnetic sheet (12), which changes the inductance of the antenna coil (11a) and is formed in a position superimposed upon the antenna coil (11a). The capacitor (11b) has thermal characteristics whereby capacity changes according to changes in temperature. The magnetic sheet (12) is formed from magnetic material having thermal characteristics such that the resonance frequency of the antenna circuit (11), in the operating temperature range, is made to match substantially the oscillation frequency of the reader/writer (2) and the inductance of the antenna coil (11a) is changed by an inverse characteristic to that changing the capacity of the capacitor (11b) according to temperature changes within the operating temperature range.

Inventors:

ORIHARA KATSUHISA (JP)
SUGITA SATORU (JP)
SAITO NORIO (JP)
KANNO MASAYOSHI (JP)

Application Number:

PCT/JP2010/062618

Publication Date:

February 03, 2011

Filing Date:

July 27, 2010

Export Citation:

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Assignee:

SONY CHEM & INF DEVICE CORP (JP)
ORIHARA KATSUHISA (JP)
SUGITA SATORU (JP)
SAITO NORIO (JP)
KANNO MASAYOSHI (JP)

International Classes:

G06K19/07; H01Q7/06; G06K19/077; H01F27/00

Domestic Patent References:

WO2008105477A1

2008-09-04

Foreign References:

JP2006262053A	2006-09-28
JPH10284315A	1998-10-23
JP2009175751A	2009-08-06
JP2009111483A	2009-05-21

Other References: