3 types, 6 fields, 7 advantages of RFID technology

Why is our express delivery always accurate on the route? Why are the books in the school library managed neatly and orderly? Why are some accidentally stolen items quickly tracked back? And these have to use RFID technology because of 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 recognize and read and write data without mechanical contact or a specific complex environment. Today, the RFID technology application that everyone talks about is actually an RFID tag, which already exists in all aspects of our lives.
There are two ways to work. One is to receive the RF signal from the reader when the RFID tag enters the valid recognition range of the reader. The energy obtained by the induced current is used to send the information stored in the chip. The other is The RFID tag actively transmits a signal of a certain frequency, and the reader receives the information and decodes it, and sends it to the central information system for data processing.

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. These card types require close contact during work identification. The main working frequencies are low frequency 125KHZ and high frequency 13.56MHZ. UHF 433MHZ and 915MHZ. These products are also common in our lives and are relatively early in development.
2. Active RFID products:
This type of product has the characteristics of long-distance automatic identification, so it is applied to some large-scale environments, such as smart parking lots, smart cities, smart transportation and Internet of Things. Their main work is microwave 2.45GHZ and 5.8GHZ. , UHF 433MHZ.
3. Semi-active RFID products:
As the name implies, it is the combination of active RFID products and passive RFID products. It combines the advantages of both, and enables the microwave 2.45G to take advantage of the low frequency 125KHZ frequency to solve the problem that active RFID products and passive RFID products cannot solve. Problems such as access control, area location management, and security alarms, proximity positioning, and long-distance transmission of data.
Six fields
RFID technology is highly resistant to interference and does not require manual identification. It is often used in some areas where information needs to be collected or tracked, including but not limited to the following seven points:
1. Warehouse / Transportation / Materials:
The RFID chip is embedded in the goods, stored in warehouses, shopping malls and other goods as well as in the logistics process. The goods related information is automatically collected by the reader, and the management personnel can quickly check the goods information in the system, reduce the risk of being discarded or stolen, and improve the goods. Hand over speed, improve accuracy, and prevent stocking and anti-counterfeiting.
2. Access control / attendance:
Some companies or some large conferences can identify themselves by the door identification system by entering the identity or fingerprint information in advance, which saves a lot of time, convenient and labor-saving.
3. Fixed asset management:
Some places, such as libraries, art galleries, and museums, where assets are large or expensive, require complete management procedures or rigorous protection measures. When the information stored in books or valuables changes abnormally, it will be in the system for the first time. Remind the administrator to handle the situation.
4. Train/car identification/baggage screening:
The railway dispatching system of China's railway is a typical case, which automatically identifies the vehicle number and information input, saves a lot of manual statistics and improves the accuracy.
5. Medical information tracking:
Case tracking, waste tracking, and drug tracking 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 require real-time tracking.
Seven advantages
1. Strong anti-interference
One of the most important advantages is non-contact identification, which works in harsh environments, and is extremely penetrating, allowing you to quickly identify and read labels.
2. The data capacity of RFID tags is very large.
It can be expanded to 10k according to the user's needs, much higher than the 2,725-digit capacity of the two-dimensional bar.
3. Can operate dynamically
Its tag data can be dynamically modified by programming and can be dynamically tracked and monitored as long as the object to which the RFID tag is attached appears within the effective recognition range of the reader.
4. Long service life
Because of its strong anti-interference, RFID tags are not easily damaged and have a long service life.
5. Anti-collision
It can read multiple RFID tags simultaneously within the effective recognition range of the reader.
6. High security
The RFID tag can be attached to the product in any form, and the tag data can be password encrypted to improve security.
7. Fast recognition
As soon as the RFID tag enters the valid recognition range of the reader, the data is immediately read, and in general, the identification can be completed in less than 100 milliseconds.
Fourth, the common advance and retreat
Of course, every technology has its advantages and disadvantages. The development of RFID technology to today, there will be defects, that is, the technical application of UHF frequency band is not enough, the technology is not mature enough, the related products are expensive, and the stability is not high. There is no uniform standard in the international arena.
At present, RFID technology has been closely related to our daily life. In the current Internet of Things era, if the RFID technology is perfected, the RFID UHF technology is mature, and the RFID UHF market is widely used, the development of the Internet of Things will also Push to a new height.