G - Physics – 08 – B
Patent
G - Physics
08
B
G08B 13/24 (2006.01)
Patent
CA 2098898
An EAS system in which a transmitter alternately drives first and second antennas with the same coded message signal in its entirety. The antennas, in turn, transmit first and second signals each containing the coded message signal into respective first and second partially overlapping parts of an interrogation zone. Also disclosed is an antenna structure comprised of a plurality of loops extending one after the other and successive ones of which are of opposite phase. One of the loops circumscribes an area which is smaller than each of the other loops to realize reduced coupling to adjacent structures.
Système de service régional étendu dans lequel un émetteur entraîne en alternance une première et une seconde antennes au moyen du même signal codé intégralement. Les antennes émettent à leur tour un premier et un deuxième signaux contenant chacun le signal de message codé dans une première zone d'interrogation et dans chacune des parties de cette zone qui se chevauchent partiellement. L'invention a également trait à une structure d'antenne à boucles multiples s'allongeant l'une après l'autre, les boucles étant successivement de phases opposées. L'une des boucles délimite une région plus petite que chacun des autres loupes afin de réduire le couplage à des structures adjacentes.
Drucker Frank
Morin Sylvie R.
Watkins Harry E.
Sensormatic Electronics Corporation
Smart & Biggar
LandOfFree
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