Combined HF and UHF RFID device
First Claim
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1. A radio frequency identification device configured to be worn on a human appendage, comprising:
- an antenna structure of a first type, wherein the antenna structure of the first type is multi-planar;
an antenna structure of a second type;
a first dielectric layer configured to electrically isolate the antenna structure of the first type from the antenna structure of the second type; and
a reflective shield disposed relative to the antenna structures of the first and second types such that interference between the human appendage and the antenna structures of the first and second types is reduced during operation.
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Abstract
A wearable RFID device is configured with a geometry and materials that allow an HF RFID system and a UHF RFID system to operate in close proximity to a human body and to each other with minimal impact on performance. An RFID device may have a three-dimensional, multi-planar UHF antenna incorporated into a dielectric core with an HF antenna, or a single-plane UHF antenna separated from an HF antenna by a rigid spacer. A conductive metal backplane is disposed adjacent the wearable RFID device to improve antenna performance when disposed in close proximity to an absorbing body, such as a human being.
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Citations
19 Claims
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1. A radio frequency identification device configured to be worn on a human appendage, comprising:
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an antenna structure of a first type, wherein the antenna structure of the first type is multi-planar; an antenna structure of a second type; a first dielectric layer configured to electrically isolate the antenna structure of the first type from the antenna structure of the second type; and a reflective shield disposed relative to the antenna structures of the first and second types such that interference between the human appendage and the antenna structures of the first and second types is reduced during operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A radio frequency identification device configured to be worn on a human appendage, comprising:
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an antenna structure of a first type; an antenna structure of a second type, wherein the antenna structure of the first type and the antenna structure of the second type are single-planar; a dielectric layer configured to electrically isolate the antenna structure of the first type from the antenna structure of the second type, wherein the dielectric layer comprises a spacer that separates the antenna structure of the first type and the antenna structure of the second type, and wherein the dielectric layer is formed with a cavity in which at least one radio frequency identification chip is disposed; and a reflective shield disposed relative to the antenna structures of the first and second types such that interference between the human appendage and the antenna structures of the first and second types is reduced during operation.
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19. A radio frequency identification device configured to be worn on a human appendage, comprising:
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an antenna structure of a first type; an antenna structure of a second type, wherein the antenna structure of the first type and the antenna structure of the second type are single-planar; a dielectric layer configured to electrically isolate the antenna structure of the first type from the antenna structure of the second type; and a reflective shield disposed relative to the antenna structures of the first and second types such that interference between the human appendage and the antenna structures of the first and second types is reduced during operation, wherein the antenna structure of the second type is disposed on the dielectric layer, and the antenna structure of the first type is disposed between the dielectric layer and the reflective shield.
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Specification