Data is typically stored in user memory on a tag. This is separate from the field for the unique serial number, which can be pre-programmed or assigned by a user. The air-interface protocol standards for passive HF and UHF tags (for example, the UHF EPC Gen 2...
MEMS (micro-electro-mechanical systems, which are smaller than microscopic dust mites) have been used for several decades in everything from inkjet printers to accelerometers that deploy air bags in cars. A MEMS RFID tag contains micromechanical components that are...
“Chipless RFID” is a generic term for systems that use RF energy to communicate data but don’t store a serial number in a silicon microchip in the transponder. Some chipless tags use plastic or conductive polymers instead of silicon-based microchips....
Low- and high-frequency tags work better on products with water and metal. In fact, there are applications in which low-frequency RFID tags are embedded in metal auto parts to track them. Radio waves bounce off metal and are absorbed by water at ultrahigh frequencies....
There are many different RFID vendors with different areas of expertise. Some make active tags. Some make passive tags. Some focus only on UHF. Others sell low-, high- and ultra-high frequency systems. RFID Journal has created a searchable database of RFID vendors...
