RFID classification,Animal Microchip manufacturer

　　RFID classification

　　1. Passive RFID

　　RFID technology can be divided into three categories according to the power supply mode of its tags, namely passive RFID, active RFID and semi-active RFID.

　　Passive RFID systems use electromagnetic induction coils to obtain energy to temporarily power themselves to complete information exchange. Its simple structure, low cost, low failure rate and long service life. However, the effective identification distance of passive RFID is usually short, and it is generally used for short-distance contact identification. Passive RFID mainly works in the lower frequency band 125kHz, 13.56MHz, etc. Typical applications of passive RFID systems include: bus cards, second-generation ID cards, and canteen meal cards.

　　2. Active RFID

　　The research and development of active RFID systems started late, but they have been applied in various fields. For example, in the highway electronic toll collection (Electronic Toll Collection, ETC), an active RFID system is used. Active RFID is powered by an external power supply or a built-in battery, and actively sends signals to the reader, which has a longer transmission distance and a faster transmission speed. The active RFID tag can establish data communication with the reader in the range of 100m, and the reading rate can reach 1700 times/s. Active RFID mainly works in ultra-high frequency bands such as 90OMHz, 2.45GHz, 5.8GHz and microwave frequency bands, and has the function of identifying multiple tags at the same time. The above-mentioned characteristics of the active RFID system make it widely used in high-performance, large-scale RFID scenarios.

　　3. Semi-active RFID

　　Since the effective identification distance of passive RFID system is short (generally less than 2500px); the active RFID identification distance is long enough (generally less than 100m), but it needs an external power supply or built-in battery, and the volume is relatively large. In order to solve this contradiction, a semi-active RFID system came into being. Semi-active RFID technology is also called low-frequency activation trigger technology. Under normal circumstances, a semi-active RFID tag is in a sleep state and only supplies power to the part of the tag that holds the data, so it consumes less power and can be maintained for a long time. When the tag enters the recognition range of the RFID reader, the reader first accurately activates the tag in a small range with a 125kHz low-frequency signal to make it enter the working state, and then transmits information to it through the 2.4GHz microwave. In other words, multiple low-frequency readers are placed in different locations to activate semi-active RFID products, thereby not only positioning, but also data collection and transmission can be achieved.

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