RFID tags can store a long range of information from a serial number to the data of many pages. Readers are made mobile to be carried in hand, or they can also be mounted overhead anywhere. The core of a Radio Frequency Identification System is a tiny electronic device, often a microchip, which has some information stored in it. These microchips are very small in size, sometimes equal to the size of a human hair, but hold a large amount of data. Some chips also have a stored power source or batteries. The Radio Frequency Identification technology has various use cases, but it is most commonly used in tracking goods and currency. The RFID tag is used to track and manage inventory by asserting it to the object, animals, people, and so on. For example, they can be connected to vehicles, electronic devices, books, phones, and so on. RFID is more beneficial than using barcodes or manual systems. The tag can easily read by passing it to a nearby reader, even if it is covered by anything invisible. Unlike barcodes, reader devices can read the tag inside a case, carton, box, or other container. RFID tags are easily read hundreds at once, but the barcodes cannot be read hundreds at a time. Some RFID tags, like Battery-Aided Passive tags, can read humidity and temperature as well.
Cost of RFID Tags
Passive RFID tags cost 0.09 US dollars in 2011, with specialized tags costing up to 5 US dollars if mounted on metal or able to survive gamma sterilization. Active tags, which are used for tracking containers, medical assets, or environmental monitoring conditions, had a price of 50 US dollars, having the highest cost of 100 US dollars each. Battery-Aided Passive (BAP) tags had a price of a range of 3-10 US dollars.
Types of RFID Systems
RFID systems are further classified into three types.
Low Frequency (LF) RFID systems
High Frequency (HF) RFID systems
Ultra-High Frequency (UHF) RFID systems.
Microwave RFID systems
Microwave RFID systems are also developed now. However, frequencies of these systems vary to a great extent based on the country and region. Low frequency (LF) RFID and High frequency (HF) RFID are some of the RFID types emerging today.
Low Frequency (LF) RFID Systems – They have a range of 30 kHz – 500 kHz, and the usual frequency is 125 kHz. They have short transmission ranges, usually anywhere from a few inches up to less than a height of 6 feet.
High Frequency (HF) RFID Systems â€“ They have a range of 3 MHz to 30 MHz, having an average frequency of 13.56 MHz. The standard range being few inches to several feet from anywhere.
Ultra-High Frequency (UHF) RFID Systems – They have a typical range of 300 MHz to 960 MHz, having a normal frequency of 433 MHz. These frequencies are read from 25-plus feet away.
Microwave RFID Systems â€“ They operate at a frequency of 2.45 GHz. The frequency depends on the RFID application used, though the actual frequency range can sometimes vary from the expected range. For example, US State Department announced releasing electronic passports facilitated with an RFID chip, having said that the chips can only read from approximately 4 inches away. Although, the State Department soon proved that the RFID readers could read the data from the RFID tags from a distance much farther than 4 inches â€“even sometimes upward than 33 feet away.
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