In the practical 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 warehouse goods, the inventory of the number of books in the library scene, including dozens or even hundreds on conveyor belts or pallets. The reading of each cargo label. In the case of reading a large number of goods, it is called the reading rate according to the probability of being successfully read.
In the case where the reading distance is desired to be longer and the scanning range of the radio wave is wider, UHF RFID is generally used. So what are the factors that affect the reading 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 outer packaging, the placement of the goods, the temperature and humidity of the environment, the height of the ceiling, and the distance between the reader and the reader. influence, etc. In the actual application of RFID, it is actually 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 RFID reader queries first, and the tags respond to 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.
In addition, it should be noted in practical applications that sometimes there are metal commodities in the goods, which may interfere with 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 placement of the goods is a very important factor, which requires a reasonable design, and it is necessary to ensure that the electronic label is non-damaged and readable.
We are mainly engaged in various types of handheld devices, provide hardware devices such as UHF handheld devices and software customization services, support multi-tag reading, and provide our customers with solutions such as inventory management and asset inventory.
Post time: Sep-30-2022