The difference between high frequency rfid tags and ultra high frequency rfid tags

Radio frequency identification technology is a technology that uses radio waves for data transmission and identification. It can realize automatic identification, tracking and management of objects. The RFID system mainly consists of two parts: a reader (Reader) and a tag (Tag). The reader communicates with the tag through radio waves to obtain the information Stored in the tag.

RFID technology can be divided into several types according to different operating frequencies: low frequency (LF), high frequency (HF), ultra high frequency (UHF) and microwave (MW). Among them, high frequency and ultra-high frequency are the two most widely used RFID technologies at present. They each have their own advantages and limitations, and have different applicability in different scenarios.

This article will compare the differences between high frequency and ultra-high frequency RFID technology from the following aspects:

Working principle: High-frequency RFID technology uses the principle of near-field inductive coupling, that is, the reader conducts energy transmission and data exchange with the tag through the magnetic field; UHF RFID technology uses the principle of far-field electromagnetic radiation, that is, the reader conducts energy transmission and data exchange with the tag through electromagnetic waves. Energy transmission and data exchange.

Working range: High-frequency RFID technology is affected by magnetic field attenuation, and its working range is small, generally within 10 centimeters; UHF RFID technology is affected by electromagnetic wave attenuation, and its working range is larger, generally more than 1 meter.

Reading speed: High-frequency RFID technology is limited by the principle of near-field inductive coupling, so its reading speed is slow, and it is difficult to read multiple tags at the same time; UHF RFID technology is limited by the principle of far-field electromagnetic radiation. The reading speed is faster and it is easier to read multiple tags at the same time.

Anti-interference ability: High-frequency RFID technology has strong "immunity" to environmental noise and electromagnetic interference due to the near-field inductive coupling principle, so it has strong anti-interference ability; UHF RFID technology has strong anti-interference ability due to the principle of far-field electromagnetic radiation. It is more susceptible to electromagnetic interference and therefore has weaker anti-interference capabilities.

Cost: High-frequency RFID technology is more expensive because it requires the use of complex and expensive coils to manufacture tag antennas, and more materials are needed to protect the chip from damage or electrostatic discharge; UHF RFID technology is more expensive because it can be used Simple and cheap metal strips or printed wires are used to make the tag antenna, and less material can be used to protect the chip from damage or electrostatic discharge, so the cost is lower.

Application scenarios: Due to its small working range, slow reading speed, strong anti-interference ability, and high cost, high-frequency RFID technology is more suitable for scenarios that require accurate identification, security and confidentiality, and complex environments, such as Access Control, electronic pasSports, and smart cards. etc.; due to its large working range, fast reading speed, weak anti-interference ability, and low cost, UHF RFID technology is more suitable for scenarios that require rapid identification, large-scale management, and simple environments, such as logistics tracking and warehousing management. , supermarket settlement, etc.

High-frequency and ultra-high-frequency RFID technologies each have their own advantages and disadvantages, and the selection should be weighed and compared based on specific needs and conditions.