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Differences of the UHF and HF RFID Tags in Application

With the rapid development of the Internet of Things technology, the application of electronic tags has been involved in various fields. Here DTB RFID will briefly introduce the difference between UHF and HF RFID electronic tags in application:

1. Differences between the HF and UHF tags

The typical working frequency of high-frequency RFID tags is 13.56MHz, which is generally passive. When the tag exchanges with the operating data, the tag must be located in the near-field area radiated by the RFID reader antenna. The reading distance of high-frequency tags is generally less than 1 meter. Because high-frequency tags can be easily made into a card shape, they are widely used in electronic tickets, electronic ID cards, electronic locks and anti-theft (electronic remote door lock controllers), residential property management, building access control systems, etc.

The operating frequency of UHF tags ranges from 860MHz to 960MHz, and can be divided into active tags and passive tags. During operation, the radio frequency tag is located in the far-field area of the UHF reader's antenna radiation field, and the coupling mode between the RFID tag and the antenna is electromagnetic coupling. The radiated field of the UHF reader antenna provides radio frequency energy to the passive tag and wakes the passive tag. The reading distance of the corresponding radio frequency identification system is generally greater than 1 meter, typically 4 to 6 meters, and the maximum can reach more than 10 meters. Reader antennas are generally directional antennas. Only radio frequency tags within the directional beam range of the reader antenna can be read/written. Due to its long reading distance and fast data transmission rate, UHF tags are widely used in automatic identification of railway trains, container identification, and also in highway vehicle identification and automatic toll collection systems.

2.The characteristics of HF tags and UHF tags

HF tags are cheaper, and energy-saving, and have a strong ability to penetrate non-metallic objects. Their working frequency is not restricted by radio frequency control, so they are most suitable for objects with high water content, such as fruits.

UHF has a wide range of action and fast data transmission speed, but they consume more energy and have weak penetration, so there should not be too much interference in the operation area. They are suitable for monitoring items transported from the seaport to the warehouse. Moreover, the price of UHF systems is relatively high, generally about 10 times that of high frequency systems.

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