RFID wireless communication technology

Radio Frequency Identification (English: Radio Frequency IDentification, abbreviation: RFID) is a wireless communication technology that can identify specific targets and read and write related data through radio signals without identifying the mechanical or optical contact between the system and a specific target.

The radio signal is transmitted through a radio frequency electromagnetic field and transmitted from a label attached to the item to automatically identify and track the item. Some tags receive energy from the electromagnetic field emitted by the recognizer when they are identified, do not require a battery, and the tag itself has a power supply and can actively emit radio waves (electromagnetic fields tuned to a radio frequency). The tag contains electronically stored information that can be identified within a few meters. Unlike the barcode, the radio frequency tag does not need to be within the line of sight of the recognizer, and it can also be embedded within the tracked object.

Conceptually speaking, RFID is similar to bar code scanning. For bar code technology, it attaches an encoded bar code to an object and uses a dedicated scanning reader to transmit information from bar magnetic to scan and write using optical signals. RFID, on the other hand, uses a dedicated RFID reader and a dedicated RFID tag that can be attached to the target, and uses frequency signals to transmit information from the RFID tag to the RFID reader.

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

Many industries use radio frequency identification technology. Attaching the tag to a car in production, the factory can easily track the progress of the car on the production line. The warehouse can track where drugs are located. RFID tags can also be attached to livestock and pets to facilitate positive identification of livestock and pets (active recognition means preventing the same identity from being used by several animals). RFID identification cards allow employees to access locked building parts, and RF transponders on cars can also be used to collect toll roads and parking fees.

Some radio frequency tags are attached to clothing, personal belongings, and even implanted in the body. Because this technology may read personal information without my permission, this technology also has the infringement of personal privacy concerns.

Initially in the technical field, transponders are electronic modules that can transmit information to reply information. In recent years, due to the rapid development of radio frequency technology, transponders have new ideas and meanings, and are also called smart labels or tags. The reader of the RFID electronic tag communicates wirelessly through the antenna and the RFID electronic tag, and can read or write the tag identification code and memory data. RFID technology can identify high-speed moving objects and can identify multiple labels at the same time. The operation is quick and easy.

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