Three Minutes To Take You To Understand RFID Technology

RFID technology actually refers to radio frequency technology. Its technology mainly relies on the principle of magnetic field or electromagnetic field to realize two-way communication between devices through radio frequency, so as to realize the function of exchanging data. The biggest feature of this technology is that it can obtain each other without contact. RFID information, ETC, logistics, and libraries are several typical application scenarios. The commonly used radio wave frequency bands for RFID technology mainly include: low frequency, high frequency, ultra-high frequency and microwave frequency bands.RFID system composition RFID system is mainly composed of three parts: reader, electronic label and data management system.

RFID Reader: Also known as a reader , it is mainly used to read out the information in the electronic tag, or write the information required by the tag into the tag. According to different uses, readers are divided into read-only readers and read/write readers, which are the information control and processing center of the RFID system. When the RFID system works, the reader transmits radio frequency energy in an area to form an electromagnetic field, and the size of the area depends on the transmission power. The tags in the coverage area of the reader are triggered, send the data stored in it, or modify the data stored in it according to the instructions of the reader and can communicate with the computer network through the interface.

RFID Tag: The electronic tag is mainly used to store certain data information. At the same time, it will accept the signal from the reader and send the required data back to the reader. The electronic tag is generally attached or fixed to the on the item.

Data management system: The main work is to process the electronic tag data transmitted by the reader for analysis, and at the same time complete the functions required by the user. For example, the following system flow:

How RFID systems work: When the rfid tag is within the recognition range of the reader, the reader emits radio wave energy of a specific frequency, and the electronic tag will receive the radio frequency signal sent by the reader and generate an induced current. Using the energy generated by this current, the electronic tag sends out the information stored in its chip. Such electronic tags are generally referred to as passive tags or passive tags, or the tags actively send a signal of a certain frequency to the reader, and such electronic tags are generally referred to as active tags or active tags. After the reader receives the information returned by the electronic tag, it decodes it, and then sends it to the relevant application software or data management system for data processing.

RFID classification: RFID technology can be divided into three categories according to the power supply method of its tags, namely passive RFID, active RFID and semi-active RFID.

1. Passive RFID

The passive RFID system obtains energy through the electromagnetic induction coil to supply power to itself for a short time and completes the exchange of information. The utility model has the advantages of simple structure, low cost, low failure rate and long service life. However, the effective identification distance of passive RFID is usually short, and it is generally used for close contact identification. Passive RFID mainly works in the lower frequency band 125kHz, 13.56MHz and so on. Typical applications of passive RFID systems include: bus cards, second-generation ID cards , and canteen meal cards.

2. Active RFID

The research and development of active RFID system started late, but it has been applied in various fields. ETC, for example, uses an active RFID system. Active RFID is powered by an external power supply or built.

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