Anti-theft RF labels are widely used in the retail industry to prevent theft of goods. Their working principle is based on radio frequency identification technology, and the specific principle is as follows:
1. Composition structure
Anti-theft RF labels usually consist of two parts: The tag itself: includes a radio frequency chip and antenna for receiving and sending signals. Electromagnetic signal source: generally an RFID reader installed at the door.
2. Working principle
The working process of anti-theft RF labels is divided into the following steps:
(1) Transmission of electromagnetic signals
The RFID reader at the door activates the nearby RF labels by emitting electromagnetic waves. This signal is usually in the low frequency, high frequency or ultra-high frequency range, depending on the type of tag.
(2) Tag response
When a product with an RF label approaches the reader, the tag's antenna receives the RF signal emitted by the reader. The chip inside the tag generates energy based on the received signal, thereby activating the chip.
(3) Transmission of tag information
The tag's chip sends its stored information back to the reader through the antenna. This information is usually pre-programmed and used to identify the product.
(4) Monitoring system response
When goods pass through the store entrance or exit, if the tag is not properly released, the reader will send an alarm signal to notify security personnel or the store system.
3. Types of anti-theft tags
Passive tag: The most common type of anti-theft label, which does not require a battery. It works by obtaining energy from the radio frequency signal of the reader.
Active tag: This type of label has a built-in battery and can actively transmit signals. It is usually used to monitor larger items or special occasions.
4. Unlocking mechanism
After purchasing goods, the store usually uses special equipment to remove the electronic chip or built-in circuit in the anti-theft tag, making the tag unable to respond to the signal of the reader. This process will make the tag lose its function and avoid triggering an alarm.
In summary, anti-theft RF labels work by using electromagnetic waves to activate items tagged with them. The label then transmit information to interact with the store's surveillance system. If an item leaves the store without authorization, the system triggers an alarm. This technology offers high security and efficiency, and is widely used in modern retail anti-theft management.