According to the working frequency of the tag, the types of RFID tags can be divided into low frequency RFID tags, high frequency RFID tags, ultra-high frequency(UHF) RFID tags, microwave tags, etc.
The typical working frequency of low frequency RFID tags is 125kHz to 134.2kHz. Low frequency tags are mostly the above-mentioned passive tags. The working energy of the tag is obtained from the radiated near field of the reader-writer coupling coil through inductive coupling. And the reading and writing distance is small, which is generally within 10cm and less than 1 meter.
1. Energy saving, strong penetrating ability, basically free from external interference;
2. But it has slow data transmission speed, small tag capacity, low data transmission rate, poor flexibility, and is difficult to be identified.
3. Only one-to-one tags can be read in a certain period of time.
4. It is only suitable for use in low-speed and short-distance application scenarios.
The common working frequency of high frequency RFID tags is 13.56MHz, and its working principle is basically the same as that of low frequency tags, which is mostly passive tag. The working energy is obtained from the radiation field of the reader-writer coupling coil through inductive coupling, and the reading and writing distance is generally less than 1M.
1. With 14443A/B protocol, it adopts the principle of the electromagnetic induction near-field coupling, which has a short use distance.
2. But there are many encryption protocols, which are mainly used for identification occasions.
The typical UHF operating frequency is 860MHz to 960MHz, and the standards used in different countries are not the same.
UHF RFID tag has a wide range of action and fast data transmission speed, but it consumes more energy, has weak penetrating power, and there should not be too much interference in the work area.
UHF RFID is widely used in supply chain management, production line automation management, air parcel management, container management, parking lot management, non-stop toll management, library management, warehouse management, etc.
The antenna of the microwave tag is directional, which helps to determine the reading area of passive and semi-passive tags.
Generally used for long-distance recognition and the recognition of fast-moving objects, such as the field of short-distance communication and industrial control, the field of logistics, railway transportation identification and management, and the electronic toll collection (ETC) system of expressways.