Radio Frequency Identification
In RFID technology the data is stored on a microchip (IC) connected to a printed antenna - called a transponder. Information (bit) is exchanged via electromagnetic waves and stored in the chip.. Because radio frequency waves are able to penetrate a lot of materials most transponders can be attached as a label or hard tag. It is also possible to imbed them in packages or products.
The Electronic Product Code (EPC) is used here as a generic term for a serialised identification of articles, packages etc.
Advantages of the RFID technology:
- High speed reading process = saving of time
- Visual contact between the label and reader is not necessary
- High reliability – even under extreme environmental conditions
- Permanent inventory possible
- Transparent exchange of information in real time
- Bulk reading – several transponders simultaneously
Most of the RFID transponder have user memories which can be encoded and read repeatedly, i.e. approximately 100.000 cycles, in addition to the locked serial identification of the product.
There are two kinds of RFID transponders to distinguish: active and passive ones. The active tags are supplied with energy by a battery. The passive tags receive their energy from the antenna’s frequency during the communication process.
A distinction is made between the frequency ranges: LF – low frequency at 125 – 134 kHz, HF – high frequency at 13.56 MHz and UHF – ultra high frequency at 865 – 869 MHz (European frequencies).
Typical RFID uses are shown in our examples of application.