RF security tags, also known as Radio Frequency identification tags, are a common anti-theft device used in retail stores. They work by creating a communication link with security gates placed at the entrance or exit of a shop.
At their core, RF security tags consist of an antenna and a radio transmitter. These components are typically very thin and are often sandwiched between two layers of a sticker or built into a plastic tag.
The Mechanics: Tag, Gate, and Detection
The process involves the RF tag and the security gates.
The RF Tag
As mentioned, RF security tags are made up of:
- An Antenna: This component receives signals from the security gates and transmits a response back.
- A Radio Transmitter: This is the electronic circuit that emits the radio signal.
These elements are often combined into an "inlay" within the tag.
The Security Gate
Security gates at the shop entrance continuously emit a specific radio frequency signal. When an active RF tag passes through the gate's detection zone, the gate's signal energizes the tag's antenna.
The Communication
Once energized, the tag's radio transmitter responds by sending its own signal back to the gate. This communication confirms the presence of an active tag.
According to the reference, RF anti-theft stickers work by communicating with security gates at your shop's entrance. This communication is essentially the tag responding to the gate's interrogation signal.
What Happens When a Tag is Detected?
When the security gate receives a signal from an active tag, it triggers an alarm. This alerts store staff that an item with an undeactivated tag is leaving the premises.
Deactivation
For legitimate purchases, the RF tag must be deactivated. This is typically done at the point of sale. Deactivation methods vary depending on the type of tag, but common methods include:
- Using a Deactivation Pad: Placing the tag on a special pad that emits a strong RF signal, disrupting the tag's circuit.
- Detaching Hard Tags: Physical removal of the tag.
Deactivation ensures the tag will not respond to the security gates when the customer leaves the store, preventing false alarms.
Summary Table
| Component | Function | Interaction |
|---|---|---|
| RF Tag | Contains antenna and radio transmitter. | Responds to gate signal when active. |
| Security Gate | Emits radio frequency signal, detects tag response. | Triggers alarm if an active tag is detected. |
| Deactivator | Renders the tag inactive. | Prevents the tag from responding to the gate. |
RF security tags provide a simple yet effective layer of security for retail environments by using radio frequencies to detect unauthorized removal of merchandise.
