How to choose UHF RFID tags in the project

UHF RFID tags have a wide range of market application scenarios. They have the advantages of being able to read multiple tags at one time, long recognition distances, fast data transmission speeds, high reliability and lifespan, and tolerance to harsh outdoor environments. It can be used in Asset MANAGEMENT, production line management, supply chain management, warehousing, anti-counterfeiting traceability of various items (such as tobacco, alcohol, medicine, etc.), retail, vehicle management, etc.

At present, the common UHF RFID air interface protocols in China include international standards, national standards, industry standards, and enterprise standards. The most popular standards are 6C and 6D standards, namely ISO/IEC 18000-6C(63), ISO/IEC18000-6D(64), and the Chinese national standard GB/T 29768- 2013.

The definition and coverage of UHF electronic tag frequency bands in the world are not the same, for example: the frequency bands of China are 840~844MHz and 920~924MHz, the frequency bands of the European Union are 865MHz~868MHz, the frequency bands of Japan are between 952MHz~954MHz, and the frequency bands of Hong Kong, Thailand and Singapore are 920MHz~925MHz , the United States, Canada, Puerto Rico, Mexico, and South America have a frequency band of 902MHz~928MHz.

1. Environmental issues of label application

Especially for UHF RFID products, metals and liquids have a great influence on its performance. Therefore, whether the application environment is metal or non-metal, liquid or plastic, glass, wood, etc., is the primary consideration.

The direct impact of raw materials on the radio frequency signal: Metal has an impact on the radio frequency signal of the RFID tag. If it is used in a metal object or a working environment with a lot of metal influence, it is necessary to use an anti-metal electronic tag, so as to reduce the impact of metal on the tag data signal. , to facilitate the normal use of RFID electronic tags.

The performance of UHF RFID tags is easily affected by the environment. If it is necessary to determine whether the product is suitable for the actual application environment, in the early stage of testing, the performance must be directly tested on the object to have a reference value.

2. Influencing factors on the tag recognition distance

The reading distance is also directly related to the reader and the antenna. It is necessary to clarify the installation position and angle relationship between the tag and the reader antenna. At the same time, parameters such as power selection, antenna gain, polarization mode, and radiation angle all belong to the category that needs to be considered.

In the entire RFID system, every detail may affect the actual reading distance, and whether it can finally meet the project requirements, and even the length of the feeder (the cable connecting the antenna and the reader) needs to be considered.

Third, the understanding of the size of the label

In our many project experiences in the past, customers often hope that the size of the label is small, which is good-looking and easy to install.

However, the size of the label is precisely one of the main factors that determine the performance of the label. Generally speaking, the larger the size, the better the performance of the label can be designed. Different manufacturers, different models and specifications, different IC production technology and antenna manufacturing technology, the price has certain differences, consumers should follow Select based on actual usage and cost budget.

4. Other considerations

In addition, there are other detailed considerations, such as: Does the tag have environmental reliability requirements such as temperature and humidity resistance? How much data capacity does the tag need to write? How much is the maximum number of tags that need to be read at one time? Etc.