16.4.2.2.1 Reader Option #1: Fixed RFID Readers
This option consists of installing ?¬?xed RFID readers at the dock doors. The reader??™s
antennas are then placed on each side of the dock door behind protective bollards at the
height at which the products will pass. This con?¬?guration is referred to as an RFID portal.
When the forklift or pallet truck passes through the RFID portal during activity ??????3.7.
Backup pallet truck into the warehouse,??™??™ the tags are automatically scanned. The advantage
of this option is that it signi?¬?cantly reduces the activities necessary in the receiving process.
It also offers more ef?¬?cient read rates than the other reader options because it uses more
antennas. Its main disadvantage is that it requires more investment than the other two
options described later. Additionally, this option may not permit to capture all the case
smart labels. If the items within the cases on the pallet contain metal, liquid, or other
dielectric components then it may be dif?¬?cult to obtain a tag read of the cases located in the
middle of the pallet because of their in?¬‚uence on RF propagation. Another factor limiting
the capacity to read the cases in the middle of the pallets is tag shadowing. Tag shadowing
occurs when multiple tags are in close proximity, which can occur with tagged cases on a
pallet. Tags are continuously being improved in order to be read more effectively and at
greater distances.
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