ATBECHDEDKESFRGBGRITLILUNLSEMCPTIESILTLVFIROMKCYALTRBGCZEEHUPLSKBAHRIS..MT..RS......................JDIM360 Ver 2.15 (14 Jul 2008) - 1999001/01892844CORRECTED EUROPEAN PATENT APPLICATIONA9A320091007W171deBibliographieenBibliographyfrBibliographieEP07253131.220070809enenen839483 P20060823US200910072009412008022720080920091007200941H01Q 7/00 20060101AFI20090629BHEP deSystem zur Minimierung von KopplungsnullstellenenSystem for minimising coupling nullsfrSystème pour la minimisation des zéros de couplage1Tagsys SAS08368050KP/16046EP180, Chemin de Saint-Lambert13821 La Penne-sur HuveauneFRLenevez, YvesAvenue de Verdun, La Malouniere Bat H13400 AubagneFRSwindell & Pearson0010114148 Friar GateDerby Derbyshire DE1 1GYGBATBEBGCHCYCZDEDKEEESFIFRGBGRHUIEISITLILTLULVMCMTNLPLPTROSESISKTRALBAHRMKRS20090805200932

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.