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How to improve the reading rate of multi-label UHF RFID equipment?

December 21,2022.

In the actual application of RFID equipment, it is often required to read a large number of tags at the same time, such as the inventory of the number of goods in the warehouse, the inventory of the number of books in the library scene, including dozens or even hundreds of labels on the conveyor belt or pallet. The reading of the goods label. For the situation of most goods being read, the probability of being successfully read is called the read rate.

UHF RFID reader is generally used when the reading distance is expected to be longer and the scanning range of radio waves is wider. So what are the factors that affect the reading rate of UHF RFID?

In addition to the reading distance and scanning direction mentioned above, the reading rate will also be 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 outer packaging, the way the goods are placed, the temperature and humidity of the environment, the height of the ceiling, and the distance between the reader and the reader. impact etc. In the actual scene 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 reading rate of RFID multi-tag? If you want to improve the reading rate of multi-tags, you have to start from the reading principle.

When reading multiple tags, the RFID reader first inquires, and the tags respond to the reader's inquiries one after another. If there are multiple tags responding at the same time during the reading process, the reader will inquire again, and the inquired tags will be marked to make them "sleep", thereby preventing them from being read again. Like this, the high-speed data exchange processing between the reader and the tag is called congestion control and anti-collision.

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

In addition, in practical applications, it is also necessary to pay attention to the fact that sometimes there are metal products in the goods, which may cause interference to the reading of non-metallic tags; the RF power of the tag and reader antenna is not enough, and the reading distance is limited; and the direction of the antenna, The location of the goods is a very important factor, which requires a reasonable design, and it is necessary to ensure that the electronic tags are readable without damage.

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