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US 8,427,373 B2Granted
RFID patch antenna with coplanar reference ground and floating grounds
AssigneeSensormatic Electronics Corporation
InventorsBing Jiang, Richard John Campero, Steve Edward Trivelpiece
Life of this patent
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Abstract
In accordance with a preferred embodiment of the invention, reader antennas are provided within storage fixtures for transporting RF signals between, for example, an RFID reader and an RFID tag. In a preferred embodiment, the RFID-enabled storage fixtures are implemented using an intelligent network, which may allow enhanced flexibility in controlling systems for interrogation of RFID antennas.
Claims25
An antenna assembly, comprising:
- a planar laminate;
- a planar electrically conductive area of predetermined shape and dimension forming a radiative antenna element on the planar laminate;
- another planar electrically conductive area of predetermined shape and dimension forming a reference ground element on the planar laminate, such that the radiative antenna element and the reference ground element are coplanar, and wherein there is no substantial overlap between the radiative antenna element and the reference ground element;
- a first planar electrically conductive floating ground element that is oriented parallel to the radiative antenna element and the reference ground element, that is separated from the planar laminate by an air-filled space, and that is electrically connected directly to the radiative antenna element;
- and
- a second planar electrically conductive floating ground element on the planar laminate and coplanar with the radiative antenna element and the reference ground element;
- wherein the radiative antenna element is substantially larger than the reference ground element and the second floating ground element.
4 more elements
A method of making an antenna assembly comprising the steps of:
- providing a planar laminate;
- forming a planar electrically conductive area of predetermined shape and dimension into a radiative antenna element on the planar laminate, and forming another planar electrically conductive area of predetermined shape and dimension into a reference ground element that is substantially smaller than the radiative antenna element on the planar laminate, such that the radiative antenna element and the reference ground element are coplanar, and wherein there is no substantial overlap between the radiative antenna element and the reference ground element;
- providing a first planar electrically conductive floating ground element that is oriented parallel to the radiative antenna element and the reference ground element, that is separated from the planar laminate by an air-filled space, and that is electrically connected directly to the radiative antenna element;
- providing a second planar electrically conductive floating ground element on the planar laminate, wherein the second floating ground element is substantially smaller than the radiative antenna element and is coplanar with the radiative antenna element and the reference ground element;
- and
- attaching a connection element that electrically connects each of the radiative antenna element and the reference ground element.
3 more elements
Dependencies are inferred from the claim text.