The meaning of RFID:

RFID technology, also known as radio frequency identification, is a communication technology, commonly known as electronic tags. A specific target can be identified by radio signals and related data can be read and written without the need to establish mechanical or optical contact between the identification system and the specific target.

For radio frequency, it is generally microwave, 1-100GHz, which is suitable for short-distance identification communication.

RFID readers are also divided into mobile and fixed types. At present, RFID technology is widely used, such as: libraries, access control systems, food safety traceability, etc.

definition

Radio Frequency Identification (RFID) is a wireless communication technology that can identify specific targets through radio signals and read and write related data without the need to establish mechanical or optical contact between the identification system and the specific target.

The radio signal transmits the data from the tag attached to the item through the electromagnetic field tuned to the radio frequency to automatically identify and track the item. Some tags can get energy from the electromagnetic field emitted by the identifier when they are identified, and do not need batteries; there are also tags that have power themselves and can actively emit radio waves (electromagnetic fields tuned to radio frequencies). The tags contain electronically stored information and are identifiable within a few meters. Unlike barcodes, RFID tags do not need to be within the line of sight of the identifier and can also be embedded within the object being tracked.

RFID technology is used in many industries. By attaching the tag to a car in production, the factory can easily track the car's progress on the production line. Warehouses can track where medicines are. Radio frequency tags can also be attached to livestock and pets to facilitate positive identification of livestock and pets (positive identification means preventing several livestock from using the same identity). RFID ID cards can give employees access to locked parts of buildings, and RFID transponders in cars can also be used to levy toll roads and car parks.

Some RFID tags are attached to clothing, personal belongings, and even implanted in the human body. Since this technology may read personal information without my permission, this technology will also have the concern of violating personal privacy.

concept

Conceptually, RFID is similar to barcode scanning. For barcode technology, it attaches the encoded barcode to the target and uses a special scanning reader to transfer the information from the bar magnetic to the scanning reader using optical signals. RFID uses a special RFID reader and a special RFID tag that can be attached to the target, and uses frequency signals to transmit information from the RFID tag to the RFID reader.

structure

Structurally, RFID is a simple wireless system with only two basic components, which is used to control, detect and track objects. The system consists of an interrogator (platform) and many transponders.

current situation

Originally in the technical field, a transponder refers to an electronic module that can transmit information and reply information. In recent years, due to the rapid development of radio frequency technology, the transponder has a new meaning and meaning, and is also called a smart tag or tag. The reader of the RFID electronic tag communicates wirelessly with the RFID electronic tag through the antenna, which can realize the reading or writing operation of the tag identification code and memory data. RFID technology can identify high-speed moving objects and identify multiple tags at the same time, which is fast and convenient to operate.

In the future, the rapid development of RFID technology is of great significance to the progress of the Internet of Things.

component

Label: composed of coupling elements and chips, each label has a unique electronic code, which is attached to the object to identify the target object;

Reader: A device that reads (and sometimes writes) tag information, and can be designed to be hand-held or stationary;

Antenna: transmits radio frequency signals between the tag and the reader.