The working principle and application scenario of RFID technology 2019-04-22
Radio Frequency Identification (RFID) is a wireless communication technology that uses radio signals to identify specific targets and read and write related data without the need to identify mechanical or optical contact between the system and a particular target.

The working principle and application scenario of RFID technology
Many people may think that the RFID application is complicated. In fact, the basic working principle of RFID technology is not complicated: after the tag enters the magnetic field, it receives the RF signal from the reader, and sends the product stored in the chip by the energy obtained by the induced current. Information (passive tag, passive tag or passive tag), or the tag actively sends a certain frequency signal (Active Tag, active tag or active tag), the reader reads the information and decodes it, and sends it to the central information system. Related data processing.

The working principle and application scenario of RFID technology
A complete RFID system consists of a reader and an electronic tag, the so-called transponder and application software system. The working principle is that the Reader emits a specific frequency of radio wave energy to drive the circuit. The internal data is sent out, and the Reader receives the interpretation data in order, and sends it to the application for corresponding processing.

According to the communication and energy sensing between the RFID card reader and the electronic tag, it can be roughly divided into two types: inductive coupling and backscatter coupling. Generally, the low-frequency RFID mostly adopts the first type, and the higher frequency mostly adopts the second method.

The working principle and application scenario of RFID technology
The reader can be a read or read/write device depending on the structure and technology used, and is an RFID system information control and processing center. The reader usually consists of a coupling module, a transceiver module, a control module, and an interface unit. The half-duplex communication is generally used for information exchange between the reader and the transponder, while the reader provides energy and timing by coupling to the passive transponder. In practical applications, management functions such as collection, processing, and remote transmission of object identification information can be further implemented through Ethernet or WLAN. The transponder is the information carrier of the RFID system, and the transponder is mostly composed of a coupling element (coil, microstrip antenna, etc.) and a microchip to form a passive unit.

  main application:

1. Application of library management system

2. Management application of gas cylinder

3. Management and application of garment production line and logistics system

4. Three-table pre-charge system

5. Management and application of hotel door locks

6. Large conference personnel channel system

7. Fixed assets management system

8. Management and application of pharmaceutical logistics system

9. Management of smart shelves

10. Jewelry inventory management.

The working principle and application scenario of RFID technology
At present, RFID products on the market comply with international standards and have a reliable security encryption mechanism. This is because the current second-generation ID card and subsequent bank cards in China use this technology.

Each label has unique identification information, and the label is bound to the product information during the production process, and the label uniquely represents the corresponding item in the subsequent circulation and use. Whether it is pre-sale, in-sale, or after-sale, users can verify it in a very simple way whenever they want to verify. With the popularity of NFC mobile phones, users' own mobile phones will be the simplest and most reliable ones.

The average label storage time can be several years, ten years, or even decades. Such a storage period is sufficient for most products.

In order to consider the security of information, the application of RFID in anti-counterfeiting generally adopts the 13.56M frequency band label, and the RFID label cooperates with a unified distributed platform, which constitutes a whole process of product anti-counterfeiting system.

Moreover, for the user, the characteristics of RFID and cost performance have a natural advantage, the working frequency is 13.56MHz, and the wavelength of this frequency is about 22m. In addition to metallic materials, the wavelength of this frequency can pass through most materials, but tends to reduce the read distance. The label needs to be more than 4mm away from the metal, and its anti-metal effect is superior in several frequency bands. This band is recognized worldwide and there are no special restrictions. The sensor is generally in the form of an electronic tag, although the magnetic field region of the frequency drops rapidly, but a relatively uniform read/write area can be produced. The system is anti-collision and can read multiple electronic tags simultaneously. Some data information can be written to the tag. The data transfer rate is faster than the low frequency, and the price is not very expensive.

In general, RFID plays an irreplaceable role in our lives, ranging from bus cards, access cards, and ID cards. Large to the Internet of Things, asset equipment management, can be regarded as an important step in the development of modern scientific and technological civilization.

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