Introduce you to RFID
When it comes to RFID, many people have not heard of it or have heard of it but are not sure what RFID is. When we check out at the supermarket, the cashier can identify the product with just one swipe of the barcode scanner; Passing through the toll station on the highway, the toll will be automatically deducted without stopping; Borrowing books from the library can be easily registered by the administrator with a simple scan; In these familiar moments, there is the same 'invisible hero' - RFID. RFID was actually born a long time ago, quietly serving various industries in every corner. RFID stands for Radio Frequency Identification, and its Chinese name is Wireless Radio Frequency Identification. Simply put, it is a non-contact automatic recognition technology that can achieve information recognition without human intervention.
The composition of RFID: The composition of RFID is very simple, consisting of three components: electronic tags, antennas, and readers. These are all essential parts of RFID's job completion.
Electronic tag: An electronic tag is a miniature device that stores target information (such as ID and attribute data), equivalent to a "wireless ID card". Its core function is to receive energy, parse instructions, and provide feedback data.
Antenna: An antenna is a physical transmission channel for energy and signals between a reader/writer and a tag, primarily used for transmitting and receiving signals.
Reader/writer: A reader/writer is a digital transceiver responsible for initiating communication, processing signals, and managing data exchange, equivalent to a "wireless card reader".
The working principle of RFID
The working principle of RFID is not complicated, and the language of communication between RFID and readers is electromagnetic waves. The reader, antenna, and electronic tag achieve energy transfer and data interaction through electromagnetic waves. Their logical relationship can be summarized as follows: the reader sends instructions and receives the tag's return signal under the control of the host, the antenna is responsible for the transmission and reception of electromagnetic waves, and the electronic tag passively or actively responds and provides feedback information.
oBU
There are two main storage areas for electronic labels - the ID area holds the world's unique "ID number" (UID), and no one can change it; The user data area is like a notepad, where you can write and draw freely, making it convenient for everyone to save the information they need.  
antenna
The antenna is responsible for sending and receiving electromagnetic wave signals, allowing RFID to "chat" with the reader. Reader/writer
The reader/writer is equivalent to the "translator" of RFID. The reader/writer first sends a signal through the antenna, and the RFID sends the information in the tag back to the reader/writer through the antenna. Finally, the reader/writer transmits the information to the host to complete the recognition.
Frequency of RFID
RFID can be divided into four categories based on frequency: low frequency, high frequency, and ultra-high frequency. Different frequencies and characteristics play unique roles in different scenarios.
 
The Application of RFID
Various industries have benefited greatly from the popularization and application of RFID technology. For example, in the traditional retail industry, relying on barcodes for inventory management requires manual scanning of each item, which is not only inefficient (a large supermarket inventory of 1000 square meters may take several hours or even a day), but also prone to distortion of inventory data due to missed or incorrect scanning, leading to "out of stock" or "backlog" problems. After adopting RFID technology, the entire lifecycle data of goods, including storage, shelving, sales, and returns, can be recorded through RFID tags, and the system can update inventory status in real time. Stores can accurately grasp "which products are on the shelves, in the warehouse, and about to sell out", avoiding "false stockouts" (products are actually in the warehouse but not on the shelves) or excessive stockpiling caused by information lag, and improving inventory turnover efficiency by 20% -50%.
In the warehousing and logistics industry, in the past, the entry and exit of goods required manual counting and registration forms, which not only consumed a lot of manpower and time. After adopting RFID technology, forklifts can quickly read the information of goods between insertion and unloading, and transmit the information of goods in and out of the warehouse back to the big data visualization board. Factory warehouse managers can have a clear understanding of the warehouse operation situation through the board data.
RFID technology is applied in logistics management and warehouse management systems, with accuracy and precision reaching or even exceeding 99%, which is much higher than the accuracy of manual visual management before, reducing cost waste and package delivery errors for enterprises. All product logistics are automatically recorded and documented, making it easier to further optimize tracking and identification.
In fact, RFID is ubiquitous in our daily lives. When you use an access card to open a hotel door, when you use an employee card to clock in at the office, when you swipe your card to borrow books from the library, and when you automatically charge for entering and exiting a parking lot, all of these miraculous RFID devices are at work. After reading the above introduction, have you gained a deeper understanding of RFID.