ADAPTIVE COUPLER FOR REACTIVE NEAR FIELD RFID COMMUNICATION
First Claim
1. A multi-layer electromagnetic coupler arrangement for coupling electromagnetic power to a planar metallic trace of arbitrary geometric shape, the electromagnetic coupler arrangement comprising:
- a top surface layer forming a top surface of the electromagnetic coupler arrangement, said top surface layer being arranged closest to said metallic trace to which the electromagnetic power is to be coupled;
a dielectric layer having a surface covered by said top surface layer;
an input signal source layer for providing an AC electromagnetic input field signal; and
a one- or a two-dimensional array of phase altering elements sized and mutually arranged to provide a phase compensation for a spatial change of position between each of said phase altering elements and a neighboring said phase altering element for transforming said input field signal into a distributed electromagnetic field with substantially constant phase across said top surface;
wherein said one- or two-dimensional array of phase altering elements is provided between said input signal source layer and said dielectric layer.
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Accused Products
Abstract
An adaptive near field electromagnetic coupler for coupling electromagnetic power to a plane metallic trace (inlay) independently of the inlay geometry and/or orientation without external control algorithms. This is achieved by employing a microstructure of phase altering elements suitable for creating a constant phase field distribution along a top surface of the coupler structure. This is advantageously applicable to printing devices having a function of encoding RFID layers printed on a medium. In view of the provided flexibility, the coupler arrangement can be employed in a variety of printers of different mechanical design.
5 Citations
20 Claims
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1. A multi-layer electromagnetic coupler arrangement for coupling electromagnetic power to a planar metallic trace of arbitrary geometric shape, the electromagnetic coupler arrangement comprising:
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a top surface layer forming a top surface of the electromagnetic coupler arrangement, said top surface layer being arranged closest to said metallic trace to which the electromagnetic power is to be coupled; a dielectric layer having a surface covered by said top surface layer; an input signal source layer for providing an AC electromagnetic input field signal; and a one- or a two-dimensional array of phase altering elements sized and mutually arranged to provide a phase compensation for a spatial change of position between each of said phase altering elements and a neighboring said phase altering element for transforming said input field signal into a distributed electromagnetic field with substantially constant phase across said top surface; wherein said one- or two-dimensional array of phase altering elements is provided between said input signal source layer and said dielectric layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification