6 Factors That Determine The Quality Of RFID Tag

The Internet of Things has now become the darling of the times and has entered all aspects of our life and production. Its essence is to use radio frequency automatic identification (RFID tag) technology to realize automatic identification of items (commodities) and information interconnection and sharing through the computer Internet . Among the five core key technologies of the Internet of Things, RFID technology is particularly important as the key technology for "letting things speak".
The basic working principle of RFID tag technology is not complicated: after the tag enters the magnetic field, it receives the radio frequency signal sent by the reader, and transmits the product information stored in the chip with the energy obtained by the induced current, or actively sends a signal of a certain frequency; After the information is read and decoded by the reader, it is sent to the central information system for relevant data processing.
An RFID (Radio Frequency Identification) system consists of two parts: a read/write unit and an electronic transceiver. The reader sends out electromagnetic pulses through the antenna, and the transceiver receives these pulses and sends stored information to the reader in response. In fact, this is the non-contact reading, writing or erasing of data in the memory.
The technical parameters of electronic tags mainly include the energy requirements for tag activation, the reading and writing speed of tag information, the transmission rate of tag information, the capacity of tag information, the packaging size of tags, the reading and writing distance of tags, and the reliability of tags.
1. The energy requirement of RFID tag activation, when the electronic tag enters the working area of the reader, it is excited by the radio frequency signal sent by the reader, and the tag enters the working state. The activation energy of the tag refers to the energy range required to activate the electronic tag chip circuit, which requires the electronic tag and the reader to be within a certain distance, and the reader can provide the electronic tag with sufficient RF field strength.
2. The reading and writing speed of RFID tag information. The reading and writing speed of the tag includes the reading speed and the writing speed. The reading speed refers to the speed at which the electronic tag is read by the reader, and the writing speed refers to the writing speed of the electronic tag information. The speed of the tag information is generally required to be read and written in milliseconds.
3. The package size of the RFID tag, the package size of the tag mainly depends on the size of the antenna and the power supply, etc., in different occasions, there are different requirements for the package size. The small package size is millimeter level, and the large package size is decimeter level.
4. The capacity of the RFID tag information, the capacity of the tag information refers to the amount of memory carried by the electronic tag for writing data.
5. The reading and writing distance of RFID tags, the reading and writing distance of tags refers to the working distance between the tag and the reader, the reading distance and writing distance of most systems are different, and the writing distance is about 40% of the reading distance. %~80%.
6. The reliability of the RFID tag, the reliability of the tag is related to the working environment of the tag, the industrial protection level of the tag and the distance from the reader. Electronic tags can be divided into three categories: integrated circuit curing type, on-site wired rewriting type and on-site wireless rewriting type according to the different injection methods of internal storage information. According to the technical realization means of reading electronic tag data, it can be divided into three categories: broadcast transmission type, frequency doubling type and reflection modulation type.
According to the different energy supply methods (battery power supply), RFID technology can be divided into three types: active, passive and semi-active. Nowadays, the commonly popular classification methods of RFID in the industry are divided into four types: low frequency (LF), high frequency (HF), ultra-high frequency (UHF) and microwave frequency (MW) according to the different operating frequencies (unit: Hz).
The low/high frequency system generally has a working frequency of less than 30MHz, the low frequency card tag of Chenkong intelligent works at 134.2KHZ, and the high frequency card tag works at 13.56MHZ. These are the optimal solutions selected by the engineers of Chenkong technical department after testing, and meet the international standard. The basic characteristics of low-frequency tags are: the cost of RFID tags is low, the amount of data stored in the tags is small, the reading distance is short, the electronic tags have various shapes (card-shaped, ring-shaped, button-shaped, tubular), and the directionality of the reading antenna Not strong wait.
UHF systems generally operate at a frequency > 400MHz, and Chenkong uhf card tags work in the 902-928MHz frequency band. The basic features are: the cost of electronic tags and readers is high, the amount of data stored in the tags is large, the reading distance is long, and the performance of adapting to the high-speed movement of objects is good. The shape is generally card-shaped or block-shaped. There is a strong directionality.

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