RFID BEAM FORMING SYSTEM
First Claim
1. A method for deriving information from an RFID tag, comprising:
- transmitting RFID tag interrogation signals from an array of antenna elements to an RFID tag;
processing signals received by each of the antenna elements from the RFID tag to alter relative phase between them; and
deriving information from the RFID tag from a combination of the processed received signals.
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Accused Products
Abstract
A multi-protocol, multi-band array antenna system may be used in Radio Frequency Identification (RFID) system reader and sensory networks. The antenna array may include array elements with an integrated low noise amplifier. The system may employ digital beam forming techniques for transmission and steering of a beam to a specific sensor tag or group of tags in an cell. The receive beam forming network is optimized for detecting signals from each sensor tag. Narrow and wideband interferences may be excised by an interference nulling algorithm. Space division multiplexing may be used by the antenna system to enhance system processing capacity.
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Citations
43 Claims
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1. A method for deriving information from an RFID tag, comprising:
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transmitting RFID tag interrogation signals from an array of antenna elements to an RFID tag;
processing signals received by each of the antenna elements from the RFID tag to alter relative phase between them; and
deriving information from the RFID tag from a combination of the processed received signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for deriving information from an RFID tag, comprising:
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steering first transmitted RFID tag interrogation signals from an array of antenna elements to a first RFID tag;
steering second transmitted RFID tag interrogation signals to a second RFID tag;
processing signals received by each of the antenna elements from the RFID tag in response to the first and second RFID tag interrogation signals; and
deriving information from the first and second RFID tag from the processed received signals. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A method of deriving information from an RFID tag, comprising:
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determining a calibration factor for an array of antenna elements in accordance with signals received by that antenna element from a calibration signal transmitter during a calibration test;
transmitting RFID tag interrogation signals from the array of antenna elements to an RFID tag;
applying the calibration factor while processing signals received from an RFID tag in response to the RFID tag interrogation signals, and deriving information from the RFID tag from the processed signals.
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31. A method of deriving information from an RFID tag, comprising:
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transmitting RFID interrogation signals using an array of antenna elements;
processing signals received from RFID tags in response to the RFID interrogation signals with a series of CIC filters having different frequency responses; and
reconstructing information from the RFID tags from signals stored in the CIC filters after the signals have been received from the RFID tags. - View Dependent Claims (32, 33, 34)
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35. An RFID system comprising:
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an antenna array having a plurality of antenna elements;
a digital receive processing block responsive to signals received by each antenna element to derive RFID tag information from the signals; and
a CIC filter in the digital receive processing block for selectively processing portions of the received signals so that the selected portions are maintained after receipt long enough to derive the RFID tag information by post processing. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43)
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Specification