High-Q and over-coupled near-field RFID reader antenna for improved tag read range
First Claim
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1. An RFID system, comprising:
- a tag including a tag antenna and a first integrated circuit coupled together that selectively transfers a data signal; and
a reader including a reader antenna and a second integrated circuit coupled together that in combination receives the data signal from the tag;
wherein at least one of the tag antenna and the reader antenna have a Q-factor that is greater than 30;
wherein the reader antenna and the second integrated circuit are sufficiently matched in impedance to over-couple the reader antenna and the second integrated circuit to each other.
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Abstract
An RFID system in which at least one of the RFID tag antenna and the RFID reader antenna has an impedance matching network associated therewith in order to better match the impedances of the two antennas. This impedance matching places the antennas into an over-coupled regime once they are within a reasonable distance of each other (e.g., 2 to 50 mm). It also increases the Q-factor of the improved antenna, which can greatly increase the range at which the RFID reader can read the RFID tag. This improved RFID system may be used in any of a variety of application, including operating a door lock mechanism.
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Citations
11 Claims
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1. An RFID system, comprising:
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a tag including a tag antenna and a first integrated circuit coupled together that selectively transfers a data signal; and a reader including a reader antenna and a second integrated circuit coupled together that in combination receives the data signal from the tag; wherein at least one of the tag antenna and the reader antenna have a Q-factor that is greater than 30; wherein the reader antenna and the second integrated circuit are sufficiently matched in impedance to over-couple the reader antenna and the second integrated circuit to each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification