Core antenna for EAS and RFID applications
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United States of America Patent
Stats
-
Jan 8, 2008
Grant Date -
Aug 10, 2006
app pub date -
Feb 4, 2005
filing date -
Feb 4, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A core antenna system for use in electronic article surveillance (EAS) and radio frequency identification (RFID) systems. The core antenna system may include a core antenna. The core antenna may include a core, a first resonant winding disposed around at least a portion of the core, the first resonant winding having a first number of winding turns N1, and a second non-resonant winding disposed around at least a portion of the core, the second non-resonant winding having a second number of winding turns N2, the second number of turns greater than or equal to the first number of turns. The core antenna may be mounted on a shield plate and tuned to an operating frequency on the shield plate such that when the shielded core antenna is further mounted on a mounting surface, e.g., of a checkstand, no significant de-tuning of the antenna takes place.
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