Professional EAS tag manufacturer
Electronic article surveillance (EAS) system

With more than 20 year's development, Electronic article surveillance (EAS) system plays a indispensable leading role in the retail security market. It is widely applied by more and more businesses.

Electronic article surveillance (EAS) system is a effective technological method for protecting merchandise from shoplifting. Special EAS tags or labels are fixed onto merchandise in retail stores, books in libraries. Sometimes the EAS systems are even used for protecting some quite important properties in the office buildings and factories.


The EAS tags/labels will be removed or deactivated by the clerks when the item is paid and checked out. A detection system is installed at the exits of store, when the system detects any active tags, it will sounds an alarm to alert the staff.

Reusable EAS tags are mostly used on soft textiles, and disposable soft labels are normally pasted on the items packed with a box or plastic bags. For some high-value merchandises, ink security tag and alarm tag may be used instead. 


  

  Contents

  1. Types of EAS system

      Radio-frequency (RF) systems

      Acousto-magnetic (AM) systems

      Magnetic systems

      Microwave systems

  2. Invisible EAS system

  3. Installation of EAS systems

  4. Questions of EAS systems




Types of EAS systems


 ● Radio-frequency (RF) systems 8.2Mhz

  Acousto-magnetic (AM) systems  58Khz

  Electro-Magnetic (EM) systems

 ● Microwave systems



Radio Frequency system

Radio Frequency (RF) systems are the most widely used system in the world today, and there is a wide selection of  RF tags and labels on different sizes, which are compatible with RF systems. The RF tags/labels are essentially a miniature LC electronic circuit with a antenna,which frequency is from 1.75Mhz to 9.5MHz. Nowadays the most widely used frequency is 8.2Mhz RF system. When the tag/label attached to an item responds to a specific frequency emitted by a RF transmitter. The response from the tag/labels is then picked up by the RF receiver. On the process the tag/label response signal will trigger an alarm when the frequency are matched. Mostly the RF sensor takes frequency sweep technology to make sure it can deal with different frequencies.



RF soft label circuit

  RF label circuit

rf hard tag circuit

   RF tag circuit

ferrite circuit for RF hard tag

  RF ferrite circuit


Types of RF sensors

  RF TR system (1 Transmitter + 1 Receiver)

   RF Mono system (Integrate the transmitter and receiver into one frame)

   RF Handheld system (For checking the bags in a close range


RF Mono system

When the exit of a store is small, the RF mono system will be a good choice. It integrate both the transmitter and receiver into one antenna frame. Mono system is able to be applied with pulse or continuous sweep techniques or a combination of both.   


Digital Signal processing (DSP) technology

The RF sensor emit a low-energy RF pulse, to listen to the RF tag/label. Vikson system takes the advanced DSP technology will be able to distinguish between the tag signal and extraneous noise, which will highly reduced false alarm cause by some small metal object, such as key buckles and rings.



Acousto-magnetic (AM) systems

The Acousto-magnetic system has the enhanced ability to protect wider aisle and reduce metal interference.

The quite smart AM tags are mainly has three components: an magnetostictive strip, magnetically semi-hard magnetic strip and ferromagnetic amorphous strip. The three strips are enveloped by a plastic case made of PE of PVC material. 

The AM transmitter will send signals on frequency about 58Khz in pulses to form a magnetic field. When the AM tag enters this surveillance field, the magnetostictive strip will physically getting shrinks about one-thousandth of an inch over its full length. As a result of driving the tag is getting smaller and larger.

Like this it will constantly absorbing energy from the transmitter, and will responds the transmitter by emitting a single frequency signal like a tuning fork. When this tag signal is detected by receiver and correctly recognized by a microcomputer, the alarm will be triggered. (Mostly the AM transmitter and receiver are integrated into one frame antenna, and the microcomputer is independent.)


          component of acousto-magnetic tag

              Acousto-magnetic tag



Electro-Magnetic systems

The Electro-Magnetic (EM) system is mostly used by libraries, for the tags can be deactivated when books are borrowed and re-activated upon return. Except for that, the EM tag is much thinner than any other type of EAS tag/label, so it can be easily concealed in the pages of a book.  The EM system is also suitable for some low-value goods in retail stores, for the tags' small size and low cost.


The EM tag is essentially a metal wire or ribbon with high permeability. It is made of a strip of amorphous metal with low magnetic saturation, and it is also lined with ferromagnetic material with a moderate coercive field. When the tag enters the detection zone, the EM receiver will detect the change of signal cased by the tag goes from active to saturated. The EM system works through intensive low frequency magnetic fields (In the range of 70Hz ~ 1KHz) generated by the transmitter. When the EM tag strip enters this area, it will emit a unique frequency pattern, which will be picked up by receiver and then trigger alarms. For the low-frequency character, it can be attached to metal surfaces.



microwave eas tags

Microwave EAS strip tags



Microwave systems

The microwave system are mostly applied in clothing retail stores. The Microwave transmitter A will emit a low-frequency (about 100Khz) detection field, and transmitter B will send microwave. When the Microwave tag enters the detection zone, it will mix the signals from A & B transmitters together to form a modulated signal which can trigger alarm. 



Invisible EAS system


The traditional EAS antennas take up some places on the aisle. When the customers are crowed, it may takes some inconvenience. Vikson develops a new advanced floor-based invisible EAS anti theft system, which will be buried into the sub-floor can multiple units can be installed end to end, to make sure maximum detection performance and making it ideal for clothing stores with wider aisle. Although this new system sounds perfect, but this is not suitable for all retailers, for the deterrent effect of traditional EAS system can not be denied.