RFID, or Radio-Frequency Identification, is a technology that uses radio waves to communicate between a reader and a passive RFID tag or card. The RFID card, also known as a transponder, contains a microchip that stores and processes information, as well as an antenna that transmits and receives the radio signals. There are several types of RFID chips available, each with different capabilities and characteristics.
Ultra-High-Frequency (UHF) RFID chips, which operate at frequencies between 300 MHz and 3 GHz. They have a read range of up to 10 meters and are often used for inventory tracking and supply chain management. -Active RFID tags have own power source and can have much larger range and transmit much more data.
Popular brands of RFID chips include NXP, Alien Technology, Impinj, and Avery Dennison. Frequency used in RFID technology can vary by the application and region, for example in US 915 MHz is most commonly used frequency but in Europe 868 MHz is most commonly used.
RFID technology is used in a wide variety of applications, such as: Access control: RFID cards are commonly used to grant access to buildings, parking lots, and other secure areas.