How do RF systems work?
Radio Frequency (RF) Systems are the most
widely used systems in the United States today and RF tags and labels are
getting smaller all the time. As you can see in the drawing at the right, the
RF EAS system works like this: A label -- basically a miniature, disposable
electronic circuit and antenna -- attached to a product responds to a specific
frequency emitted by a transmitter antenna (usually one pedestal of the
entry/exit gate). The response from the label is then picked up by an adjacent
receiver antenna (the other pedestal). This processes the label response signal
and will trigger an alarm when it matches specific criteria. The distance
between the two gates, or pedestals, can be up to 80 inches wide. Operating
frequencies for RF systems generally range from 2 to 10 MHz (millions
of cycles per second); this has become standard in many countries. Most of the
time, RF systems use a frequency sweep technique in order to deal with
different label frequencies.
Sometimes both the transmitter and receiver
are combined in one antenna frame -- these are called mono systems and they can
apply pulse or continuous sweep techniques or a combination of both. According
to Tag Point Ltd. experts, mono systems could be effective for you if your
store's entry is small. The mono system is used with hard labels, which are
slightly more expensive than paper labels used with RF sweep techniques.
Sensors(gates/pedestals) made by Checkpoint
Systems, one of the largest manufacturers of EAS products , emit a low-energy RF pulse, which
"listens" for the tag. This technology, known as digital signal
processing, actually "learns" about its surroundings so that it can
accurately distinguish between the tag signal and extraneous noise. Store
employees love this because it virtually eliminates false alarms! (Store owners
often ask why there are no invisible sensors. Cross Point experts say it is
technically possible to create an invisible system by, for example, installing
an antenna loop around a store's door. However, tests have shown that the
preventive value of a visible system is greater and results in decreased
theft.)
There are many different ways to implement
an RF system (see this patent and the patents it references for one type of
implementation). The basic idea is that the tag has a helical antenna etched
from thin aluminum bonded to a piece of paper. At the end of the antenna is a
small diode or RC network that causes the tag to emit a radio signal in response
to the radio signal it receives. To disarm the tag, a strong RF pulse (much
stronger than the gates emit) blasts the tag and burns out the diode or RC
components. Between the gates a burned out tag does not emit a signal, so the
gates let it pass without an alarm.
We
are source tagging suppliers in China.
Our
products are Acoustic Magnetic label and Radio Frequency label, it compatible
with all existing security systems.
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Cobra
Tech
Co.,Ltd
ShunDe,FoShan,GuangDong,528300 China
Tel:+86 757-63928676
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