System for minimising coupling nulls

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(11)

EP 1 892 844 A9

(12)	CORRECTED EUROPEAN PATENT APPLICATION
	Note: Bibliography reflects the latest situation

(15)	Correction information:
	Corrected version no 1 (W1 A3)
	Corrections, see Bibliography

(48)	Corrigendum issued on:
	07.10.2009 Bulletin 2009/41

(88)	Date of publication A3:
	05.08.2009 Bulletin 2009/32

(43)	Date of publication:
	27.02.2008 Bulletin 2008/09

(21)	Application number: 07253131.2

(22)	Date of filing: 09.08.2007

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International Patent Classification (IPC):

H01Q 7/00^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR MK RS

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Priority:

23.08.2006 US 839483 P

(71)	Applicant: Tagsys SAS
	13821 La Penne-sur Huveaune (FR)

(72)	Inventor:
	Lenevez, Yves 13400 Aubagne (FR)

(74)	Representative: Swindell & Pearson
	48 Friar Gate Derby Derbyshire DE1 1GY Derby Derbyshire DE1 1GY (GB)

(54)	System for minimising coupling nulls

(57) A system is disclosed for minimizing coupling nulls between an electromagnetic field derived from one or more sources and a plurality of randomly oriented RFID tags, wherein the electromagnetic field is rotated relative to the tags such that no tag is persistently located in a coupling null relative to the field. The source of the electromagnetic field may include a passive antenna or loop that changes its orientation relative to a direction of movement of the tags. The source of the electromagnetic field may further include an active antenna or loop that is electromagnetically coupled to the passive antenna or loop. A method for minimizing coupling nulls between the electromagnetic field and the randomly oriented tags is also disclosed.

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