| 摘要 |
An automatic data collection system reads data encoded in data carriers located inside enclosed environments, such as radio frequency identification (RFID) tags attached to objects located in enclosures, such as buildings, shipping containers, transportation vehicles such as airplanes, and other enclosures. The enclosures have dimensions that normally exceed the read range of the RFID tags, and/or the enclosures are composed of a material (such as metal) that impede communication of signals with external RFID readers. Therefore, internal antenna systems are provided inside of the enclosures to relay interrogation signals from RFID readers to the RFID tags, and to relay response signals from the RFID tags back to the RFID readers.
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