EAS AM tag is an electronic tag widely used in commodity anti-theft systems. Its working principle mainly involves two parts: transmitter (or called antenna) and receiver.
Transmitters: Transmitters are a pair of electromagnetic antennae located at a doorway or merchandise display area. It sends electromagnetic signals around it at a specific frequency.
Tags: EAS AM tags are small electronic devices that are attached to merchandise. Inside the tag is a coil and a magnetic rod. The bar magnet is made of thin film magnetic material and is normally magnetized. When the tag comes close to the transmitter, the electromagnetic signal from the transmitter hits the coil, causing the magnetization state of the magnet to change.
Receiver: The receiver is usually located in a detection unit near the transmitter. It is responsible for receiving electromagnetic signals from the transmitter and analyzing and judging them.
During the working process, when the goods with EAS AM tags pass through the doorway or commodity area, the tags will be affected by the electromagnetic signal sent by the transmitter. When the tag receives an electromagnetic signal, the magnetic rod inside reverses its magnetization. Once the magnetic rod of the tag changes, the receiver will detect this change and send out an alarm signal to remind the staff that the item has not been checked out.
In summary, the working principle of the EAS AM tag is that the electromagnetic signal sent by the transmitter interacts with the magnetic rod inside the tag. When the tag is affected by the electromagnetic signal, the magnetization state of the magnetic rod will change, and the receiver will detect this. change and issue an alarm signal. This technology is widely used in shops, libraries and other places to ensure the safety of goods and prevent theft.