Polarized RFID Antenna with Spatial Diversity
AssigneeSymbol Technologies, Inc.
InventorsRobert I. Sandler, Carl DeGiovine, Mark W. Duron, Rehan K. Jaffri
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Abstract
A system, apparatus, and techniques for interrogating a Radio Frequency Identification (RFID) tag are disclosed. The system includes an RFID reader that includes a pivotable polarized antenna for reading a reader/tag link. The antenna moves at a specific frequency over a specific distance resulting in reader/tag links being moved out of a null region of the reader. Advantageously, by pivoting the antenna, the antenna apparatus minimizes signal fading and improves signal quality from tags.
Claims20
An RFID reader comprising:
- an antenna pivotable between a first and second position;
- an RE transmitter for transmitting an RF signal to an REID tag through the antenna;
- an RE receiver for receiving the RE signal from the RFID tag through the antenna;
- and
- a signal processor for processing the RF signal.
A method of providing spatial diversity in an RFID reader comprising:
- pivoting an antenna between a first and second position;
- transmitting an RF signal to an RFID tag through the antenna;
- receiving the RF signal from the RFID tag through the antenna;
- and
- processing the RF signal using a signal processor.
An RFID reader comprising:
- An antenna assembly comprising 1) an antenna to transmit and receive a RF signal and 2) a ground plane operatively coupled to the antenna, the ground plane pivotable at a set rate and distance between a first and second position in at least one of a horizontal, vertical, angular, and circular direction;
- and
- a signal processor for processing the RF signal.
Dependencies are inferred from the claim text.