Factors affecting the reading distance or inability to read RFID electronic tags in RFID technology systems 123
With the continuous development of technology, the concept of logistics network is no longer unfamiliar to everyone. Many industries or enterprises are very interested in using RFID electronic tags to manage fixed assets. Generally speaking, a complete RFID asset management solution includes RFID fixed asset management system, RFID reader/writer, RFID printer, RFID electronic tag, etc. RFID electronic tag is an important part of the entire system. If there is a problem with RFID electronic tag, it will affect the operation of the entire system. So, what are the factors that affect the reading distance of RFID electronic tags? Below is a summary for everyone:
Radio Frequency Identification Technology
Factors affecting the reading distance or inability to read RFID electronic tags in RFID technology systems 123
Factors affecting the reading distance of RFID electronic tags:
- It is related to the RF power of RFID readers. If the RF power is low, the reading and writing distance is close, while if the power is high, the reading distance is far;
- It is related to the gain of 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 far;
- It is related to the coordination between the polarization direction and relative angle of RFID tags and antennas. If the direction is consistent, the coordination is high, and the reading and writing distance is longer. Conversely, if there is no coordination, the reading distance is shorter;
- Related to the attenuation amount of the feeder unit, the larger the attenuation amount, the closer the read and write distance, and vice versa, the smaller the attenuation amount, the farther the read distance;
- It is related to the total length of the feed line connecting the reader/writer and the antenna. The longer the feed line, the closer the read/write distance, and vice versa, the shorter the feed line, the farther the read distance.
Factors affecting the reading distance or inability to read RFID electronic tags in RFID technology systems 123
Reason for inability to read RFID electronic tags:
1、 RFID electronic tag damaged
In RFID electronic tags, there are chips and antennas. If the chips are compressed by external forces or high static electricity, they may fail. Or damage to the RFID signal receiving antenna can also cause failure. So RFID electronic tags cannot be compressed, damaged or torn apart. Generally, RFID electronic tags with high requirements are encapsulated in plastic cards to avoid damage from external forces.
2、 Affected by interfering objects
RFID electronic tags cannot pass through metal objects. When the tag is obstructed by metal, it will affect the reading distance of the RFID reader, and may even be impossible to read at all. Meanwhile, the radio frequency information of RFID electronic tags is also difficult to penetrate through water, and if 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 perform penetrative communication. If the usage scenario is special, it is necessary to customize anti metal tags or other electronic tags with special characteristics, such as high temperature resistant tags, waterproof tags, etc.
Factors affecting the reading distance or inability to read RFID electronic tags in RFID technology systems 123
3、 Reading distance too far
RFID electronic tags have different production processes, application environments, RFID readers, and reading distances. If the reading distance is too far, it will affect the reading effect.
The above summarizes the factors that affect the reading distance or inability to read RFID electronic tags. With the continuous development of RFID technology, more and more industries will also apply it in detail.
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