Multi-band RFID encoder
First Claim
Patent Images
1. A multi-band near-field RFID encoder, comprising:
- a substrate;
an internal coil antenna defined within the substrate;
an annular ground plane defined on a first surface of the substrate;
a second ground plane defined on an opposing second surface of the substrate, wherein the annular ground plane and the second ground plane form a Faraday cage for the internal coil antenna; and
a second antenna disposed on the opposing second surface within the annulus defined by the annular ground plane.
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Abstract
In one embodiment, a multi-band near-field antenna for an RFID encoder includes a substrate; an internal coil antenna defined within the substrate; an annular ground plane defined on a first surface of the substrate; a second ground plane defined on an opposing second surface of the substrate, wherein the annular ground plane and the second ground plane form a Faraday cage for the internal coil antenna; and a second antenna disposed on the opposing second surface within the annulus defined by the annular ground plane.
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Citations
14 Claims
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1. A multi-band near-field RFID encoder, comprising:
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a substrate;
an internal coil antenna defined within the substrate;
an annular ground plane defined on a first surface of the substrate;
a second ground plane defined on an opposing second surface of the substrate, wherein the annular ground plane and the second ground plane form a Faraday cage for the internal coil antenna; and
a second antenna disposed on the opposing second surface within the annulus defined by the annular ground plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system comprising:
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a bar code printer;
a capacitive near-field RFID encoder integrated with the bar code printer, wherein the capacitive RFID encoder includes;
a substrate having a first ground plane on a first surface;
a plurality of capacitive elements on an opposing second surface of the substrate, each capacitive element including a plurality of serially-connected stripline conductors, the RFID encoder being configured to drive a first selected one of the capacitive elements with an RF signal and to drive a second selected one of the capacitive elements with a phase-shifted version of the RF signal; and
an annular ground plane on the opposing second surface, the annular ground plane surrounding the capacitive elements. - View Dependent Claims (12, 13, 14)
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Specification