Ring antennas for resonant circuits
First Claim
1. A ring antenna for a resonant circuit for mounting on or around an object comprising:
- a core ring having a first core surface and a second core surface wherein said core ring is made from a ferromagnetic material;
a wire coil including wire made from an electrically conductive material; and
a shield made from a non-magnetic material, affixed to said second core surface thereby separating said core from a surface of said object, and wherein said shield is separated from said first core surface by an air gap.
1 Assignment
0 Petitions
Accused Products
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.
372 Citations
30 Claims
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1. A ring antenna for a resonant circuit for mounting on or around an object comprising:
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a core ring having a first core surface and a second core surface wherein said core ring is made from a ferromagnetic material; a wire coil including wire made from an electrically conductive material; and a shield made from a non-magnetic material, affixed to said second core surface thereby separating said core from a surface of said object, and wherein said shield is separated from said first core surface by an air gap. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A ring antenna for a resonant circuit for mounting on or around an object comprising:
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a core ring having a first core surface and a second core surface wherein said core ring is made from a ferromagnetic material; a wire coil including wire made from an electrically conductive material wound around at least a portion of said core and having a first coil surface and a second coil surface wherein an air gap separates said first coil surface and said first core surface and said second coil surface is affixed to said second core surface; and a shield made from a non-magnetic material, affixed to said at least one of said core surfaces thereby separating said core from a surface of said object. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A ring antenna for a resonant circuit for mounting on or around an object comprising:
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a core ring having a first core surface and a second core surface and a third core surface wherein said core ring is made from a ferromagnetic material; a wire coil including wire made from an electrically conductive material wound around at least a portion of said second core surface; an electromagnetically transparent encasement for encasement of said coil and said core ring; and a shield made from a non-magnetic material affixed to said first and second core surfaces, and wherein an air gap exists between said encasement and said shield at the point wherein said shield is affixed to said first core surface. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A ring antenna for a resonant circuit for mounting on or around an object comprising:
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a core ring having a first core surface and a second core surface and a third core surface wherein said core ring is made from a ferromagnetic material; a wire coil including wire made from an electrically conductive material wound around at least a portion of said second core surface; an electromagnetically transparent encasement for encasement of said coil and said core ring; and a shield made from a non-magnetic material, affixed to said second core surface, and wherein an air gap exists between said shield and said first core surface and said shield and said third core surface. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A ring antenna for a resonant circuit for mounting on or around an object comprising:
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a core ring having a first core surface with an upper end and a second core surface with a an outer end wherein said core ring is made from a ferromagnetic material; a wire coil including wire made from an electrically conductive material wound around at least a portion of said second core surface; and a shield made from a non-magnetic material, affixed to at least a portion of said core thereby separating said core from a surface of said object, and wherein said shield extends beyond the upper end of said first core surface and the outer end of said second core surface. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification