Why can our courier be on the route accurately all the time? Why is the huge amount of books in the school library managed in an orderly manner? Why can some accidentally stolen items be quickly tracked back? And these have to use RFID technology, because in this In the era of the Internet of Things, it is one of the key technologies for data connection and data exchange.

What is RFID technology? RFID, also known as radio frequency identification, identifies and reads and writes specific target data through radio signals, and can complete the identification and read and write data without mechanical contact or a specific complex environment. Today, the application of RFID technology that everyone is talking about is actually RFID tags, which already exist in all aspects of our lives. It works in two ways. One is that when the RFID tag enters the effective recognition range of the reader, it receives the radio frequency signal sent by the reader, and uses the energy obtained by the induced current to send out the information stored in the chip. The other is The RFID tag actively sends a signal of a certain frequency, and after the reader receives the information and decodes it, it is sent to the central information system for related data processing. In the middle of the twentieth century, based on the improvement and application of radar, radio frequency identification technology began to lay the foundation, and then began to develop initially. Until today, the application of RFID technology has a history of half a century. At present, RFID technology is widely used in China. The development of foreign countries is in good condition, especially the United States, Germany, Sweden, Japan, South Africa, the United Kingdom and Switzerland and other countries, all have relatively mature and advanced RFID systems, and my country is not far behind in the development of this area. Launched a fully autonomous research long-distance automatic identification system.
Next, the editor will take you to understand RFID technology:
three types
There are three main categories of products derived from RFID technology:
1. Passive RFID products: such products require close-contact identification, such as meal cards, bank cards, bus cards and ID cards, etc. These card types all require close contact during work identification, and the main working frequencies are: Low frequency 125KHZ, high frequency 13.56MHZ, ultra high frequency 433MHZ and 915MHZ. This type of product is also more common in our life, and it is also a product that has developed relatively early.
2. Active RFID products: This type of product has the characteristics of long-distance automatic identification, so it is correspondingly applied to some large-scale environments, such as smart parking lots, smart cities, smart transportation, and the Internet of Things. Their main work There are microwave 2.45GHZ and 5.8GHZ, ultra-high frequency 433MHZ.
3. Semi-active RFID products: As the name suggests, it is a combination of active RFID products and passive RFID products. It combines the advantages of the two, and under the trigger of the low frequency 125KHZ frequency, allows microwave 2.45G to play its advantages and solves the problem of active RFID products. The problems that cannot be solved by passive RFID products, such as the application of access control access management, regional positioning management and security alarm, activate positioning at short distances, and transmit data over long distances.
six areas
RFID technology has the characteristics of strong anti-interference and no need for manual identification, so it is often used in some fields that need to collect or track information, including but not limited to the following seven points:
1. Warehouse/transportation/materials: Embed RFID chips into the goods, store them in warehouses, shopping malls and other goods and in the logistics process, the relevant information of the goods is automatically collected by the reader, and the management personnel can quickly query the goods information in the system to reduce discarded or The risk of theft can improve the speed of goods handover, improve the accuracy, and prevent smuggling and anti-counterfeiting.
2. Access control/attendance: For some companies or some large conferences, by entering the identity or fingerprint information in advance, they can identify and sign in through the door identification system, which saves a lot of time in the middle, which is convenient and labor-saving.
3. Fixed asset management: Some places with huge assets or valuable items such as libraries, art galleries and museums need to have complete management procedures or strict protection measures. When the storage information of books or valuables changes abnormally, The administrator will be reminded in the system at the first time, so as to deal with the relevant situation.
4. Train/car identification/luggage security inspection: The vehicle dispatching system of my country's railways is a typical case, which automatically recognizes the vehicle number and information input, saves a lot of time for manual statistics, and improves the accuracy.
5. Medical information tracking: Case tracking, waste tracking, drug tracking, etc. are all good ways to improve hospital service levels and efficiency.
6. Military/Defense/National Security: The dynamics of some important military drugs, guns, ammunition or military vehicles need to be tracked in real time.
Seven advantages
1. Super anti-interference, it has one of the most important advantages is non-contact recognition, it can work in severe and harsh environments, can and has strong penetrating power, can quickly identify and read labels.
2. The data capacity of the RFID tag is very large, it can be expanded to 10k according to the needs of users, which is much higher than the capacity of 2725 digits of the two-dimensional code bar.
3. It can be operated dynamically, its tag data can be dynamically modified by programming, and can be dynamically tracked and monitored, as long as the object attached to the RFID tag appears within the effective recognition range of the reader.
4. Long service life, because of its strong anti-interference, the RFID tag is not easy to be damaged and has a long service life.
5. Anti-collision, within the effective recognition range of the reader, it can read multiple RFID tags at the same time.
6. High security, RFID tags can be attached to the product in any form, and can encrypt the tag data with a password to improve security.
7. The recognition speed is fast. As soon as the RFID tag enters the effective recognition range of the reader, the data will be read immediately. Generally, the recognition can be completed in less than 100 milliseconds.
Advance and retreat together
Of course, every technology has its advantages and disadvantages. The development of RFID technology to this day will also have defects. That is, the technical application of UHF frequency band is not widely enough, the technology is not mature enough, the related products are expensive and the stability is not high. , and there is no uniform international standard.
At present, RFID technology is closely related to our daily life. In the current Internet of Things era, if RFID technology is improved, RFID UHF technology is mature, and RFID UHF market development is widely used, then the development of the Internet of Things will also be Take it to a new level.