Single frequency low power RFID device
First Claim
1. A radio frequency identification (RFID) system for communicating with RFID tags, comprising:
- a host computer; and
an RFID module coupled to the host computer, wherein the RFID module includesa transceiver,a protocol processor configured to process RFID tag data,a host interface connector module configured to communicate RFID tag data with the computer,a plurality of antennas, andan antenna selector to couple an antenna of the plurality of antennas to the transceiver.
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Accused Products
Abstract
Methods, systems, and apparatuses for a reader transceiver circuit are described. The reader transceiver circuit incorporates a frequency generator, such as a surface acoustic wave (SAW) oscillator. A reader incorporating the reader transceiver circuit is configured to read a tag at very close range, including while being in contact with the tag. The transceiver can be coupled to various host devices in a variety of ways, including being located in a RFID reader (e.g., mobile or fixed position), a computing device, a barcode reader, etc. The transceiver can be located in an RFID module that is attachable to a host device, can be configured in the host device, or can be configured to communicate with the host device over a distance. The RFID module may include one or more antennas, such as a first antenna configured to receive a magnetic field component of an electromagnetic wave and a second antenna configured to receive an electric field component of an electromagnetic wave. The RFID module may include a detector that is configured to determine if the RFID module is positioned in proximity to an object, such as a RFID tag. The detector may operate as a trigger for the RFID module, to enable or trigger a function of the RFID module.
113 Citations
25 Claims
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1. A radio frequency identification (RFID) system for communicating with RFID tags, comprising:
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a host computer; and an RFID module coupled to the host computer, wherein the RFID module includes a transceiver, a protocol processor configured to process RFID tag data, a host interface connector module configured to communicate RFID tag data with the computer, a plurality of antennas, and an antenna selector to couple an antenna of the plurality of antennas to the transceiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A data capture system for communicating with RFID tags, comprising:
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a host computer; and an RFID module coupled to the host computer, wherein the RFID module includes a transceiver, a protocol processor configured to process RFID tag data, a host interface connector module configured to exchange tag data with the computer, an electronically configurable antenna system connected to the transceiver, and means to configure the antenna system to match properties of an antenna of a RFID tag proximate to the RFID module. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A radio frequency identification (RFID) reader, comprising:
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a transceiver; and an antenna coupled to the transceiver; wherein in a first mode, the antenna is tuned to a first frequency; wherein in a second mode, the antenna is in contact with a RFID tag, wherein in the second mode, the antenna is configured to be tuned for a second frequency different from the first frequency due to a load of the RFID tag in combination with a characteristic impedance of the antenna; wherein a radiation efficiency of the reader is optimized for the second frequency. - View Dependent Claims (17, 18, 19, 20)
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21. A radio frequency identification (RFID) device for communicating with RFID tags, comprising:
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an antenna configured to radiate a RF signal receivable by an RFID tag in a far field region; a transceiver coupled to the antenna; a proximity sensor that outputs a proximity signal indicating whether the antenna is proximate to an object; and a tuning module configured to tune the antenna if the proximity signal indicates that the antenna is proximate to an object. - View Dependent Claims (22, 23, 24, 25)
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Specification