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What are the differences between high frequency and ultra-high frequency electronic tags?

September 26,2022.

With the development of Internet of Things technology, RFID electronic tags have been maturely applied in various fields, and the functions of RFID tags in different frequency bands are also different. High-frequency RFID technology and UHF RFID technology are both important technical application directions in the RFID field. Let's take a look at them. What is the difference between high frequency RFID electronic tags and UHF RFID electronic tags?

1. Different scope of application

High-frequency RFID tags, with a typical operating frequency of 13.56MHz, are generally passive, and the tags must be located in the near-field area radiated by the RFID reader antenna during data exchange; the reading distance of high-frequency tags is generally less than 1 meter is not very expensive in terms of price. High-frequency tags can be widely used in book management (book labels), AGV car site identification (AGV round coin landmark), production tracking and traceability management (industrial code body) and other applications.

UHF RFID electronic tags, operating frequencies between 860MHz and 960MHz, can be divided into two categories: active tags and passive tags. When working, the tag is located in the far-field area of the antenna radiation field of the UHF reader; the reading distance of the UHF tag is generally greater than 1 meter, typically 4 meters to 6 meters, or even more than 10 meters. It has three main advantages: strong safety performance, strong confidentiality, strong penetration performance, can be used in harsh environments, reusable, large data memory capacity, widely used in asset management, warehouse management, automatic vehicle identification , supply chain, logistics management, etc.

2. Different degrees of technological development

High frequency technology is relatively mature than UHF technology. From the initial commercialization in 1995 to today's widespread and mature practical application, high-frequency technology has achieved quite good results. UHF technology has just begun to enter the stage of large-scale application, and its technical level has not fully reached the stage of maturity.

3. Different work characteristics

High-frequency tags are cheaper than UHF tags, save energy, and have strong penetrating power to non-metallic objects, and the working frequency is not restricted by radio frequency control; UHF has a wide range of action and fast data transmission, but it consumes more energy and has better penetrating power. Weak, there can't be too much interference in the working area, and the price of UHF is higher.

4. Different signal interference

Both HF and UHF RFID systems are very dependent on the communication environment between the reader and the tag, however, the near-field inductive coupling of HF technology reduces potential wireless interference, making HF technology less sensitive to ambient noise and electromagnetic interference It has a strong "immunity"; while UHF adopts the principle of electromagnetic emission, so it is more susceptible to electromagnetic interference. At the same time, metal reflects the signal and water absorbs the signal, all of which interfere with the normal function of the tag.

5. Different standards

The International Organization for Standardization/International Electrotechnical Commission formulated the ISO/IEC, 15693 standard in 1999, which regulates the implementation of high-frequency radio frequency identification technology. The high frequency band of 13.56MHz becomes the International Scientific and Medical (ISM) band valid worldwide. After Japan agreed to use consistent high-frequency frequencies in December 2002, its power levels were also harmonized worldwide. UHF standards are less uniform, and the frequencies used by different countries are not the same. The EU-designated UHF is 865~868MHz, the United States is 902~928MHz, India is 865~867MHz, Australia is 920~926MHz, Japan is 952~954MHz, and China and other countries have not given a suitable UHF. The frequency band range, in the standard missing state.

All in all, both high-frequency and ultra-high-frequency RFID electronic tags can play the role of identification, item tracking and information collection. The RFID system composed of electronic tags, readers, antennas and application software is directly connected to the corresponding management information system, and each item can be accurately tracked. This comprehensive information management system can bring many benefits to customers , including real-time data collection and tracking management, can effectively prevent errors and greatly improve the management level of enterprises.

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