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Comparison of Active and Passive RFID in Warehouse Applications
May 28, 2018

Comparison of Active and Passive RFID in Warehouse Applications


Passive RFID is composed of an antenna and a chip. When a tag enters a magnetic field, it is driven by the integrated circuit through the received electromagnetic waves. These electromagnetic waves are emitted by an RFID reader. When the tag receives a sufficiently strong signal, the RFID tag is activated and data can be sent to the reader. Passive RFID recognizes and records information through the reader's communication with RFID tags. The antenna can be installed anywhere to identify the information of the recording tag. RFID is typically installed in the warehouse doorway or on a key node, which we usually call "the throat."


Passive RFID can track or monitor the shipments of pallets, boxes and goods entering and leaving the warehouse. When entering the warehouse, the goods may already have an RFID tag, or they may need to initialize the tag, enter the cargo information, and then past it on the goods. When carrying out warehousing business, you can use fixed RFID readers, handheld RFID handheld data terminals, and forklift-type mobile readers to perform key storage and inventory, inventory, and picking. During business hours, goods associated with RFID tags are automatically recorded, and the collected information can be transmitted to the data center management platform in real time.


And for active RFID, it is an active RFID electronic tag. It is a type of electronic tag that is divided according to the different methods of electronic tag power supply. It usually supports long-distance identification. The active RFID electronic tag periodically transmits signals according to preset rules. When the RFID tag enters the active area of the reader, the reader obtains the information transmitted by the tag, which completes the process of identifying the tag.


Active RFID readers are placed in areas of the warehouse where goods need to be monitored and tracked. According to the site environment, active readers are deployed to ensure coverage and signal strength, and the wireless LAN is wirelessly connected. Entry planning is the same thing. There are different types of active tags, some active tags can set different signal emission cycles, can be at specific times and rules, and if the tag is moved or out of the library, it will automatically alarm. For inventory counts, tags can automatically wake up and report their regular presence.





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