Ring antennas for resonant circuits
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United States of America Patent
Stats
-
Jan 26, 1999
Grant Date -
N/A
app pub date -
Dec 19, 1996
filing date -
Dec 22, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ring antenna (10) for resonant circuits for identifying metallic containers has an annular core (11) having at least one core surface (11a') corresponding to at least one surface of the container and made from ferrite. The core may be U-shaped, having a base portion and a first and second arm portions, or L-shaped, having a base portion and a first arm portion (11a). The antenna (10) also has a copper wire coil (12) wound around a first portion of the core; and an aluminum shield (13) affixed to the at least one core surface (11b') and separating the core from the surface of the container. Further, a interrogation system for identifying metallic containers includes the ring antenna (10) coupled to a resonant circuit (86) included in a transponder or a reader.
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