The most widely used labels in the security systems for goods are the RF-labels. These labels are used in almost all sectors - supermarkets, department stores and professional markets.
The construction of the RF label is simple. The electronic part of the label is located at the bottom and is usually applied directly with a permanent adhesive on the product. A coil, which also serves as an antenna, is connected to a small capacitor. It receives and sends radio waves. Together, they form a resonant circuit with a frequency of about 8.2 MHz. When an activated label approaches the vicinity of the detectors(Gates), which are usually placed at the exit of a store, the radio-electronic oscillator circuit triggers an alarm. The deactivation of electronic article surveillance is usually be done after payment at the cashpoint either by mechanical control of the electronic part or by electrical manipulation.
The covering material on the top of the label is usually made of paper but can also be PE or PP material. The label can be imprinted with the particular information by a suitable printer. One of the biggest advantages of the RF-label is the low cost and the possibility to combine electronic retail security and pricing as well.