RFID CORE TECHNOLOGY
In the simplest terms, RFID is a technology that utilizes radio waves for communication between a transmitter and a receiver. In the case of RFID for business, the receiver is a reader/antenna and the transmitter is a tag. The tag is encoded with a unique identification number. This number is transmitted to the reader anytime the tag is queried. The unique ID number can then be referenced in a database for additional information regarding the tagged item. Any RFID system is made of two main components: hardware, software/database. The hardware consists of tags, reader and antennas. The software consists of middleware and a database table containing a list of all encoded tags and at least one initial cross reference for the tag. There are a wide number of tags on the market. Depending on the tag, the operating frequency range will be at 125 khz, 13.56 mhz, 915 mhz, 2.45 ghz or 5.8 ghz. A tag is designed to work in only one frequency range. Tags are available in a wide range of styles and shapes. Tags also have limited read ranges. Tag type, style and frequency is dictated by structure of the item to be tagged, general environmental conditions in which the tag must operate, and the range at which the tag must be read. Tags can be divided into two main groups: active and passive. While the definition for each group continues to evolve, there is an easy definition which helps to separate the two groups. Active tags have a built-in power source (i.e. Battery) and will broadcast their signal to readers. Passive tags do not have a built in power source. Instead passive tags wait for a reader's signal to reach them and provide power to the tag. The passive tag will then utilize the signal from the reader for power and broadcast its unique ID back to the reader on the reader's signal. Currently tags in the 915mhz range are being used for many supply chain applications. These tags have a 64 or 96 bit memory capacity and are governed under a set of...
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