The reason why the RFID electronic tag cannot be read and the factors that affect the reading distance?

With the popularization of the concept of the Internet of Things, we are more interested in using RFID electronic tags to manage fixed assets, generally speaking, a complete set of solutions includes RFID fixed asset management system, RFID printer, RFID tag, RFID reader, etc. As an important part, if there is any problem with RFID electronic tags, it will affect the whole system. The reason why the RFID electronic tag cannot be read

1. RFID electronic tag is damagedRFID electronic tag, there are chips and antennas, if the chip is pressed by external force or high static electricity may fail. antenna, if the RFID signal receiving antenna is damaged, it will also cause failure. Therefore, the RFID electronic tag can not be pressed, damaged or torn. Generally, RFID electronic tags with high requirements will be packaged in plastic cards to avoid damage by external forces

Second, there are interfering objects that affect the RFID electronic tag can not pass through the metal, when the tag is blocked by metal, it will affect the reading distance of the RFID inventory machine, or even can not read at all. At the same time, the radio frequency information of RFID electronic tags is also difficult to penetrate water, and if it is blocked by water, the sensing distance will also be limited. In general, the signal of RFID tags can penetrate non-metallic or non-transparent materials such as paper, wood and plastic, and can carry out penetrating communication. If the use scenario is special, it is necessary to customize anti-metal tags or electronic tags with other characteristics, such as high temperature resistance, waterproof, etc

Third, the reading distance is too far RFID electronic tags according to the production process is different, the application environment is different, the RFID reader is different, the reading distance is not the same, if the reading distance is too far, it will affect the reading effect. Factors affecting the reading distance of RFID electronic tags:

1. It is related to the RFID reader RF power, if the RF power is small, the reading and writing distance is close, on the contrary, if the power is large, the reading distance is far

2. It is related to the gain of the RFID reader antenna, the gain of the reader antenna is small, and the reading and writing distance is close, anyway, the gain is high and the reading distance is long

3. It is related to the degree of coordination between the polarization direction and the relative angle of the RFID tag and the antenna, the direction is consistent and the degree of coordination is high, and the reading and writing distance is far, on the contrary, the reading distance is close if it is not cooperated

4. It is related to the attenuation of the feeder unit, the larger the attenuation, the closer the reading and writing distance, and vice versa, the attenuation decreases and the reading distance is far

5. It is related to the total length of the feeder connecting the reader and the antenna, the longer the feeder, the closer the reading and writing distance, and vice versa, the feeder is short and the reading distance is far