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How to improve the read rate of UHF RFID multi-tags?

How to improve the read rate of UHF RFID multi-tags?

Issue Time:2022/07/05

Abstract: When the reading distance is longer and the scanning range of the radio wave is wider, UHF RFID is generally used.

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In the practical application of RFID, it is often required to read a large number of tags at the same time, such as the inventory of warehouse goods, the inventory of library books in library scenarios, including dozens or even hundreds on conveyor belts or pallets. The reading of cargo labels. In the case of reading a large number of goods, it is called the reading rate according to the probability of being successfully read.


When the reading distance is expected to be longer and the scanning range of the radio wave is wider, UHF RFID is generally used. Therefore, in the field of logistics and supply chain, UHF RFID technology is chosen worldwide. Therefore, I will further elaborate on the reading rate of UHF RFID.


What are the factors that affect the read rate of UHF RFID?


In addition to the read distance and scan direction mentioned above, the read rate is also affected by many other factors. For example, the movement speed of the goods at the entrance and exit, the communication speed between the tag and the reader, the material of the pasted goods and the outer packaging, the placement of the goods, the temperature and humidity of the environment, the height of the ceiling, and the relationship between the reader and the reader. influence between devices, etc.


I believe that after reading the above description, you must be able to realize that in the actual application of RFID, it is actually very easy to be affected by the external environment, and these different environmental factors are intertwined with each other, which together constitute the key difficulties that need to be overcome in the implementation of RFID projects. .


How to improve the read rate of RFID multi-tags?


If you want to improve the multi-tag reading rate, you have to start from the reading principle.


When multiple tags are read, the reader will query first, and the tags will answer the reader's query successively. If multiple tags respond at the same time during the reading process, the reader will query again, and the queried tag will be marked to make it "sleep" to prevent it from being read again. In this way, the high-speed data exchange process between the reader and the tag is called congestion control and anti-collision.


To improve the read rate of multiple tags, the reading range and reading time can be extended, and the number of information exchanges between tags and readers can be increased. In addition, the high-speed communication method between the reader and the tag can also improve the read rate.


However, in a real-world scenario, the situation is far too complicated. For example, sometimes there are metal goods in the goods, which may cause the label to be unreadable at some angles. Therefore, the direction of the antenna and the placement of the goods are very important factors, and a reasonable design is required to allow the reader to read the tags from all angles.

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