UHF RFID tags are an important branch of RFID tags. Passive radio frequency tags divided into low-frequency tags. High-level tags and ultra-high-frequency tags. Low-frequency tags mainly use in simple access control systems. And their reading distance is generally within 20 cm. High-level tags, including NFC series, have good encryption and can be read at close range. Then there is only the UHF tag, which is a long-distance reading tag. Unique can reach 2 to 8 meters. And the UHF tag can have anti-collision function and fast reading speed. Because of these properties, almost all UHF tags use in the process of logistics warehouse management.
UHF Tag Inventory Management
Improve Read Rate
In the actual application process, the reading rate of ultra-high screen tags is a very important factor. Because batch reading, in addition to reading speed. Whether it can ensure good reading without revealing reading is an important key to refined management.
So how to ensure that UHF tags will not be missed?
There are many factors that affect read rates. Although in the laboratory we can clearly measure the reading distance. And the reading time of the 100% reading rate. As long as the card machine determine, the settings of the card machine determined. And the label, distance, and antenna direction determined. The read rate guaranteed. But in actual use, the situation is much more complicated. For example, in a warehouse, the environment of the warehouse may change. For example, a large amount of steel has been newly imported into the warehouse today. Or it is raining today and the temperature and humidity have changed drastically. Which will affect the admission of labels.
Angle
So in the actual antenna read head installation and debugging process. All antenna positions, the angles of items. And the position of the card reader need to repeatedly debugged and verified. In order to obtain the best measurement distance. Then the reading range of the card reader also needs to be adjusted according to actual needs. The reading range is not as large as possible, and needs to keep within a certain range. There is also the position and direction of the objects placed when purchasing the goods. Which is also very particular.
Of course, after using the omnidirectional antenna, the antenna position problem weaken. but it still has some influence.
Influencing Factors
After the UHF card reader reads the object, there will be an anti-collision setting. That is, the tags that have been read will automatically locked and no longer read. In this way, the reading efficiency of the card machine can improve. There is also the issue of the speed of vehicles entering the warehouse. Sometimes there are many items in a batch of goods entering the warehouse. Then we need to set a warehouse entry speed. To avoid misreading and missing reading. In some cases, we can set up multiple card machines to read the same batch of labels. The multi-card machine reads tags from different positions to improve the reading speed and avoid missed reads.
UHF Tag Inventory Management 2
Label Life
Of course, in general, new tags have good performance. And the rate of fast and missed reading is low. However, label life may shortened if labels used and stored improperly. For example, some labels are not resistant to light. If they exposed to the sun for a long time, the service life of the label will relatively short. This requires regular replacement.
If the label is to be used outdoors, specific industrial labels recommended. The expected life of these labels will be longer.
Special attention should pay to the use of labels in metal environments. Especially when there are labels that will use against metal surfaces.We should use anti-metal labels. Otherwise, the metal will block a lot of RF signals. Vulnerabilities are often prone to occur.
Summarize
All in all, it is a systematic project to improve the reading rate and reduce and avoid misreading and missing reading.
All the usage environment and the service life of the label need to pay attention to. Be sure to do a good job of testing before putting it into actual use. Various times, various environments, various quantities of goods. And the speed of purchase must fully tested, and there should be no sloppy work.
Keyword: RFIDHY Warehousing NFC tag RFID Solutions
Text: Li Shijun RFIDHY
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