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Radio frequency identification technology is a core technology for Internet of Things applications . It has the characteristics of fast reading and writing, long-distance transmission, etc., which provides convenience for various convenient applications of the Internet of Things .
We usually divide RFID tags into the following three categories:
1. Passive RFID tags
Features: Passive, no internal power supply module. It drives the internal integrated circuit by receiving the electromagnetic waves. This unique electromagnetic wave is sent by the RFID reader. When a passive tag receives a signal of a certain strength, it can successfully stimulate its internal to send data to the reader. This data includes the ID number and data in an electrically erasable programmable read-only memory pre-existing in the tag.
Advantages: Passive tags are low in price, small in size, easy to carry, and require no power supply. At present, it is a type of electronic tag that is used more in the market.
Disadvantages: Passive RF tags rely on the electromagnetic waves emitted by the reader to obtain working energy, so if the propagation path is accompanied by energy attenuation, the reading distance of the passive tag will be greatly limited.
2. Semi-active RFID tags
Features: The specification of the semi-active tag is similar to that of the passive one, except that it has a small power supply battery inside. The voltage of the small battery can just drive the integrated circuit inside the tag. The faint signal sent out, in fact, the tag still has enough voltage to transfer the data stored in the tag to the reader.
3. Active RFID tags
Features: It has an internal power supply module, which can self-sufficiently supply the externally generated signal voltage required by the internal integrated circuit. In general, active tags can read long-distance data information and have a large capacity of memory.
September 6, 2015
Chengdu Xinxin Electronic Technology Co., Ltd. Editorial Department
Editor: Little Devil in Gourd