Why Is RFID So Popular?

RFID (Radio Frequency Identification) technology, also known as wireless radio frequency identification technology, is a communication technology that utilizes radio signals to achieve non-contact automatic identification. It conducts bidirectional data communication through wireless radio frequency, which can identify and read/write information in electronic tags or radio frequency cards, thereby completing data communication between readers and tags and identifying targets and exchanging data.

Principles of Remote RFID
1) Configuration of remote RFID
Before studying the principles of remote RFID, it is necessary to study the structure of RFID. The RFID system consists of three parts: electronic tags, readers and writers, computers, and their application programs. Electronic tags are mainly composed of built-in antennas and circuit chips, which have the function of completing communication with RF antennas. The reader mainly consists of four parts: antenna, control unit, wireless transceiver front-end, and communication interface. Its main function is to read or write information of electronic tags. The functions of computers and application software are connected to external computers through the communication interface of readers and writers, or to the upper master station system to achieve data exchange.
2) Working principle of remote RFID
The reader and electronic tag form a responder, and its working principle is as follows. The Reader sends radio wave energy of a specific frequency to the Transformer, drives the Transformer circuit to send internal data, and then sequentially receives and interprets the data to process the application accordingly.

The characteristics of remote RFID systems
Currently, passive remote RFID systems have two operating frequency bands: UHF and 2.45 GHz. Passive ultra-high frequency systems have a reading and writing distance of over 10 meters, which is much longer than 2.45 GHz systems, making them the mainstream part of remote identification systems. Its advantages mainly include the following points:
Real time: Real time response, automatic reading of ID number, which can obtain that information.
Anti counterfeiting: The microwave display formed cannot be forged, altered, or copied.
Networking: Monitoring logistics through computer networks.
Accuracy: The accuracy of reading information is as high as 99.99%.
Low cost: It only costs a few yuan when used.
Reliability: Deals with harsh environmental conditions such as dust, moisture, etc.
Long lifespan: No battery required during use, only passive card required, no lifelong maintenance required.

The remote RFID system adopts wireless transmission mode, and the wireless environment is extremely complex. Therefore, many factors affect the read and write distance of the remote RFID system, mainly including the following points:
The main factors affecting the reading and writing distance of RF cards are the RF output power of the reader, the reflected energy, the power consumption of the RF card, the received energy and sensitivity of the reader.
2. The factors that affect the above indicators are the effective receiving and reflecting cross-sectional area of the RF card antenna and the effective receiving antenna area of the reader/writer.
When the frequency increases under the same field of view, the operating range of the passive RFID system decreases.