Methods and apparatus for arbitrary antenna phasing in an...

Details Methods and apparatus for arbitrary antenna phasing in an... Methods and apparatus for arbitrary antenna phasing in an...

2009-02-02

2011-11-01

Nguyen, Phung (Department: 2612)

Communications: electrical

Selective

Interrogation response

Reexamination Certificate

active

08049598

ABSTRACT:
A method for controlling electronic article surveillance (EAS) transmissions is described. The method includes calculating system parameters associated with one or more of a desired frequency a desired duty cycle, and a desired phase difference between antennas for a transmitter, and initializing a counter with a value based on the system parameters. The method also includes comparing a count from the counter to the system parameters, and modulating EAS transmission signals based on the comparison between the count and the system parameters. An EAS transmitter and an EAS system are also described.

REFERENCES:
patent: 4274083 (1981-06-01), Tomoeda
patent: 4679046 (1987-07-01), Curtis et al.
patent: 6118378 (2000-09-01), Balch et al.
patent: 6801028 (2004-10-01), Kernahan et al.
patent: 6995672 (2006-02-01), Yones

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