Transponder Setup of a tag
The nucleus of an RFID system is a data carrier -- the transponder or tag. It consists of a small chip and an antenna integrated in a package like a glass rod or an adhesive label. There is often a number, unique worldwide, stored on the chip that is linked to information in a database. In the meantime there are also passive transponders with memory capacity of up to 2 kbits, enabling extra information to be stored. Differentiaton
The most common distinction made between transponders is how they are powered. They come in both passive and active versions.
Passive transponders have no voltage supply of their own, and obtain their energy by creating an induction field by means of the radio signals of the reader. Although the lack of an energy source means shorter range, it does allow smaller and lighter components. Furthermore, passive transponders need no maintenance and cost much less. They are used primarily for product authentification and tracking, and also as a data medium in access control systems.
Active transponders draw their energy from a built-in battery, so they can also send signals to transmit data. Their integrated energy source makes them more expensive than passive counterparts, but on the other hand they have a reading range of up to 100 meters. Their main use is in the identification of objects with a long lifetime and that are often reused. Design
Transponders are available in many different sizes, designs and safety classes depending on what they are intended for. Common forms are, in particular, adhesive labels or chip cards. There are read-only versions that, as the name implies, can only be read, and read/write versions that allow both reading and writing of the transponder. |
