| 摘要 |
A conveyor system for processing items on which radio frequency identification tags are disposed includes a frame and a conveyor that is disposed moveably on the frame and that conveys items through a path of travel, each item having at least one respective radio frequency identification tag disposed thereon. A plurality of antennas is disposed proximate the path of travel so that the antennas radiate radio frequency signals into a first area through which the items pass and receive responses to the radio frequency signals from the respective radio frequency identification tags. At least one of plurality of antennas is disposed so that the items pass through the path of travel between the conveyor and the at least one antenna. At least one radio frequency transmitter drives the antennas. At least one radio frequency receiver receives the signals and outputs first signals corresponding to the responses. A detector is disposed with respect to the path of travel so that second signals output by the detector indicate a height of items passing proximate the detector. A processor receives the first signals from the receiver and is programmed to control the at least one transmitter to drive respective antennas in a predetermined sequence, associate a first signal with a first item if the processor receives the first signal from the receiver while at least a portion of the first item is within a second area that includes at least part of the first area, and based on the second signals, eliminate the at least one the plurality of antennas from the predetermined sequence when the first item is within the second area if the height of the first item is below a predetermined threshold.
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