Principle of RFID technology

What is the principle of rfid radio frequency identification technology? What are the applications of rfid radio frequency identification technology? Some people have such questions. RFID is commonly known as wireless radio frequency technology. As one of the key technologies for building "Internet of Things" for data connection and data exchange, wireless radio frequency technology is an emerging automatic identification technology developed in the 1980s. Use radio frequency signals to realize contactless information transmission through spatial coupling (alternating magnetic field or electromagnetic field) to achieve identification purposes. Next, I will explain to you the principles and applications of rfid radio frequency identification technology.

 What is the principle of rfid radio frequency identification technology

First, the principle of rfid radio frequency identification technology.

working principle:

After the electronic tag (Tag) enters the magnetic field, it receives the radio frequency signal from the reader (Reader), and sends out the product information (passive tag or passive tag) stored in the chip by the energy obtained by the induced current, or the tag actively Send a signal of a certain frequency (active tag or active tag), after the reader reads the information and decodes it, it is sent to the data management system for related data processing.

Derivative products:

Passive RFID products

This type of product requires close contact identification, such as food cards, bank cards, bus cards, and ID cards. The main operating frequencies are low frequency 125KHZ, high frequency 13.56MHZ, ultra high frequency 433MHZ and 915MHZ

Active RFID products

This type of product has the characteristics of long-distance automatic recognition, such as intelligent parking lot, smart city, smart transportation and Internet of Things. The main work is microwave 2.45GHZ and 5.8GHZ, UHF 433MHZ

Semi-active RFID products

Combining the advantages of both active RFID products and passive RFID products, under the trigger of low-frequency 125KHZ frequency, microwave 2.45G takes advantage, activates positioning at close range, and transmits data at long range

Second, the advantages and disadvantages of rfid radio frequency identification technology.


It has strong anti-interference, long service life, fast recognition speed, and can be operated dynamically. The data capacity of RFID tags is very large, and it is anti-collision. It can read multiple RFID tags at the same time within the effective recognition range of the reader;

High security, RFID tags can be attached to products in any form, and can encrypt passwords for tag data to improve security.


Related products are expensive, and there is no unified standard in the world. The technology of UHF band is not widely used and the technology is not mature enough.

Third, the application field of rfid radio frequency identification technology.

1. Warehouse / Transportation / Materials

RFID chips are embedded in the goods and stored in warehouses, shopping malls and other goods and logistics processes. 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

2. The field of cold chain logistics

RFID tags are embedded on the tray, which can cooperate with the warehouse management system to achieve real-time inventory and accuracy

The tag is equipped with an antenna, RFID chip and temperature sensor, as well as a button battery. Because it has both digital identification and temperature information, it can well meet the requirements of cold chain temperature monitoring.

3. Access Control / Attendance

For companies or large conferences, if you enter your identity or fingerprint information in advance, you can identify the sign-in through the door identification system, which saves a lot of time and is convenient and labor-saving.

4. Fixed asset management

Some places such as libraries, art galleries and museums with large assets or valuable items need complete management procedures or strict protection measures. When the storage information of books or valuable items changes abnormally, they will be in the system for the first time The administrator is reminded here to deal with the situation.

5. Train / car identification / baggage security inspection

The vehicle dispatching system of China's railways is a typical case. Automatic identification of vehicle numbers and information input saves a lot of time for manual statistics and improves accuracy. The application of ETC fast lane on expressway toll stations, ETC (Electronic Non-stop Toll Collection System), ETC special lanes are for those vehicles equipped with ETC vehicle-mounted devices, using electronic toll collection.

     The principles and applications of rfid radio frequency identification technology are summarized here. The future development direction of RFID should establish a unified technical standard, develop reasonable privacy protection technology, and reduce costs. Only in this way can the application and development of RFID technology be further promoted. I believe more and more industries will use it later.

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