The basic components of RFID system is,
RFID Tags:
Chip tags consist of a microchip usually attached to physical objects and store a unique identification for the object that they are attached to. In addition, they might store some other data..
Their are three typs of tags, first one is tag only activated when they are within the interrogation zone of the interrogator "passive tags", second and third ones are tags use internal batteries to power their circuits "Active and Semi-passive tags" and usually have longer read range. Chip tags can be both read-only (programmed during manufacture) or, at higher complexity and cost, read-write, or both. Chip tags contain memory. The size of the tag depends on the size of the antenna, which increases with range of tag and decreases with frequency.
RFID Interrogator "Reader":
Depending on the application and technology used, some interrogators not only read, but also remotely write to, the tags. For the majority of low cost tags (tags without batteries), the power to activate the tag microchip is supplied by the reader through the tag antenna when the tag is in the interrogation zone of the reader, as is the timing pulse - these are known as passive tags.
Middleware:
Middleware is the interface needed between the interrogator and the existing company databases and information management software.
