RF identification device with near-field-coupled antenna
First Claim
1. An RF device comprising a processing circuit, a first antenna, a substrate having upper and lower faces, and an electromagnetic expansion, said electromagnetic expansion comprising a third antenna, a fourth antenna and an electrical network connected to said third and fourth antennas;
- wherein said first antenna is configured to be magnetically or electromagnetically coupled to said fourth antenna and said third antenna is configured to be magnetically or electromagnetically coupled with a second antenna, the electromagnetic expansion being configured to generate a replica of each electromagnetic signal received by said third antenna;
wherein the third and fourth antennas include conductive lines formed on the upper face of the substrate and at least one crossing point at which a first one of the conductive lines has an interruption point defining two facing ends, said facing ends being capacitively coupled, and the third and fourth antennas further include a second one of the conductive lines having a transverse connection portion extending between said facing ends of the first one of the conductive lines to provide a conductive electrical connection of a first segment of the second one of the conductive lines to a second segment of the second one of the conductive lines.
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Abstract
An embodiment of a RF identification device is formed by a tag and by a reader. The tag is formed by a processing circuit and a first antenna, which has the function both of transmitting and of receiving data. The reader is formed by a control circuit and by a second antenna, which has the function both of transmitting and of receiving data. The processing circuit is formed by a resonance capacitor, a modulator, a rectifier circuit, a charge-pump circuit and a detection circuit. The antenna of the tag and the processing circuit are integrated in a single structure in completely monolithic form. The first antenna has terminals connected to the input of the rectifier circuit, the output of which is connected to the charge-pump circuit. The charge-pump circuit has an output connected to the detection circuit.
19 Citations
16 Claims
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1. An RF device comprising a processing circuit, a first antenna, a substrate having upper and lower faces, and an electromagnetic expansion, said electromagnetic expansion comprising a third antenna, a fourth antenna and an electrical network connected to said third and fourth antennas;
- wherein said first antenna is configured to be magnetically or electromagnetically coupled to said fourth antenna and said third antenna is configured to be magnetically or electromagnetically coupled with a second antenna, the electromagnetic expansion being configured to generate a replica of each electromagnetic signal received by said third antenna;
wherein the third and fourth antennas include conductive lines formed on the upper face of the substrate and at least one crossing point at which a first one of the conductive lines has an interruption point defining two facing ends, said facing ends being capacitively coupled, and the third and fourth antennas further include a second one of the conductive lines having a transverse connection portion extending between said facing ends of the first one of the conductive lines to provide a conductive electrical connection of a first segment of the second one of the conductive lines to a second segment of the second one of the conductive lines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- wherein said first antenna is configured to be magnetically or electromagnetically coupled to said fourth antenna and said third antenna is configured to be magnetically or electromagnetically coupled with a second antenna, the electromagnetic expansion being configured to generate a replica of each electromagnetic signal received by said third antenna;
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14. An RF system comprising an external system including a control circuit and a second antenna, a plurality of RF devices and a plurality of electromagnetic expansions, each RF device comprising a processing circuit and a first antenna, said first antenna and said processing circuit being integrated in a single chip in completely monolithic form;
- each electromagnetic expansion comprising a third antenna, a fourth antenna and an electrical network connected to said third and fourth antenna, wherein each third antenna is configured to be magnetically or electromagnetically coupled with said second antenna, each electromagnetic expansion being configured to generate a replica of each electromagnetic signal received by the corresponding third antenna and generated by the second antenna, and wherein the third and fourth antennas include at least one crossing point formed by two facing ends of a first conductive line formed on a first surface of the chip that are capacitively coupled and by a second conductive line formed on the first surface and having a conductive connection portion also formed on the first surface and extending between the facing ends of the first conductive line.
- View Dependent Claims (15, 16)
Specification