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RFID tag

Radio frequency iDentification (RFID) systems typically include tags and RFID readers, which are also known as RFID reader/writers. RFID tags are used in conjunction with a radio frequency tag reader which transmits a radio frequency (RF) carrier signal and detects data signals from the RFID tag. RFID techniques entail using a device called an RFID reader to interrogate one or more RFID tags. Interrogation is performed by the reader transmitting a radio frequency (RF) wave. An RFID tag is known which has an antenna and an IC chip, storing information about an article to be managed, electrically connected to the antenna, as a tag using the RFID technique. By transmitting radio waves at a predetermined frequency to the antenna from the transceiving antenna of an interrogator, the tag is activated, data is read from the IC chip in accordance with a read command through data communication by radio waves, and data is written in the IC chip in accordance with a write command. A tag that senses the interrogating RF wave responds by transmitting back another RF wave. A tag typically includes a wireless communication device, for example a transmitter or transponder, that is capable of wirelessly communicating stored information to the reader. The tag may communicate the information independently or in response to a signal, such as an interrogation signal, received from the reader. RFID tags can either be passive or active devices. RFID tags with a power storage device are known as active tags. Active devices are self-powered, by a battery for example. Passive devices do not contain a discrete power source, but derive their energy from an RF signal used to interrogate the RFID tag. An RFID tag typically includes an antenna system, a power management section, a radio section, and frequently a logical section, a memory, or both. In earlier RFID tags, the power management section included a power storage device, such as a battery. An active tag has an onboard power source, while a passive tag may operate without an internal power source, deriving its operating power from a field generated by the reader. Passive tags are much lighter and less expensive than active tags and may offer a virtually unlimited operational lifetime. A typical passive RFID tag utilizes an induced antenna coil voltage for operation. This induced AC voltage is rectified and results in a DC voltage. As the DC voltage reaches a certain level, the RFID device starts operating. By providing an energizing RF signal, an RFID reader can communicate with a remotely located RFID device that has no external power source such as a battery. RFID tags can be attached to items in order to identify them for a variety of purposes. For example, RFID systems utilizing readers and tags can be used in a store environment to identify individual items for purposes of inventory control and purchasing transactions.

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RFID tag product listings

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