RFID, as an important part of the Internet of Things, plays a crucial role in various fields such as library management, logistics management, and smart retail. According to different frequency bands, the main frequency bands commonly used by
RFID are high frequency and ultra-high frequency. Let's take a look at the difference between
RFID ultra-high frequency and high-frequency readers?
What is the difference between
RFID ultra-high frequency and high-frequency readers?
1. Different frequency ranges
The typical operating frequency of high-frequency
RFID is 13.56MHz, and it is generally passive. When the tag exchanges data with the reader, the tag must be located within the near-field area radiated by the
RFID reader antenna. The reading distance of high-frequency tags is generally less than 1 meter.
The operating frequency of ultra-high frequency
RFID is between 860MHz and 960MHz, and does not provide different national setting standards, such as China's frequency bands of 840-844MHz and 920-924MHz; EU frequency range 865MHz~868MHz; The Japanese frequency band is between 952MHz and 954MHz.
2. Different anti-interference abilities
Both high-frequency and ultra-high frequency
RFID systems heavily rely on the communication environment between the reader and tag.
High frequency technology mainly transmits signals through near-field induction coupling, which relatively reduces potential wireless interference and makes high-frequency technology highly immune to environmental noise and electromagnetic interference.
Ultra high frequency uses the principle of electromagnetic emission, making it more susceptible to electromagnetic interference. Although some ultra-high frequency tags (such as Gen2) have excellent performance in preventing interference from metals and liquids after technological improvements, they are still slightly inferior to high-frequency tags and require other methods to compensate.
3. Different standard protocols
The International Organization for Standardization/International Electrotechnical Commission developed the ISO/IEC 15693 standard in 1999 to standardize the implementation of high-frequency radio frequency identification technology. The high-frequency band of 13.56MHz has become an effective International Scientific and Medical (ISM) band worldwide, and its power level has also been unified worldwide.
The standards for ultra-high frequency are not so uniform, and the frequencies used in different countries are also not the same. The ultra-high frequency designated by the European Union is 865-868MHz, while the United States is 902-928MHz, India is 865-867MHz, Australia is 920-926MHz, and Japan is 952-954MHz. However, countries such as China have not yet provided a suitable frequency range for ultra-high frequency and are in a state of missing standards. The direct consequence of the lack of uniformity in the ultra-high frequency band is the disconnection of the supply chain for enterprises attempting to establish a seamless global supply chain.
4. Different application scope
High frequency technology can be applied in most daily life scenarios, such as library management, industrial management, public management, logistics and warehousing management, community property management, building access control systems, etc., all of which basically use high-frequency
RFID technology.
Ultra high frequency
RFID technology has advantages such as the ability to read multiple tags at once, long recognition distance, fast data transmission speed, high reliability and lifespan, and resistance to harsh outdoor environments. Widely used in railway vehicle automatic recognition, container recognition, and can also be used in highway vehicle recognition and automatic toll collection systems.
The above is the difference between
RFID ultra-high frequency and high frequency readers. Although high frequency and ultra-high frequency may seem like the difference in frequency bands, they have different advantages and characteristics in practical applications. Therefore, when choosing
RFID ultra-high frequency readers or high-frequency readers, it is also necessary to choose based on the application scenario.
