Anti-Theft System
Anti-Theft Systems are devices which prevent unauthorized access
to Cars or other mobile systems. The evolution of Anti-theft systems has ranged
from simple key to RFID Tags, Bio metric Identification, and Palm Vein
Recognition, etc.
The anti-theft systems are combination of smart sensors coupled
with intelligent algorithms which can wisely distinguish between actual theft
and fake ones. Upon detection of theft they immediately raise an alarm or
notify the user with necessary details like geographical locations, time stamp
, state of the device while theft occurred i.e.: If the anti-theft system is
considered in automobiles , crucial data like whether the engine was turned on
, doors were unlocked ,etc. are transmitted to the owner.
Anti-theft systems protect valuables such as vehicles and personal
property like wallets, phones, and jewelry. They are also used in retail
settings to protect merchandise in the form of security tags and
labels. Anti-theft systems include devices such as locks and keys, RFID
tags, and GPS locators.
Block Diagram for Anti-Theft System:
Consider any general
anti-theft system, it consists of above mentioned blocks at the minimum level.
Passive and Active Anti-Theft Systems
Passive and active anti-theft devices are the two options
available when considering an anti-theft system.
Passive Anti-Theft devices automatically arm themselves when the vehicle is turned off, the ignition key removed, or a door is shut. No additional action is required.
Active Anti-Theft devices require some independent physical action before they are set, such as pushing a button, or placing a “lock” over a vehicle component part. This physical action must be repeated every time the anti-theft device is set or it will not function.
Rf (Radio Frequency) Anti-Theft Systems
The Radio Frequency
(RF) technology used in anti-Theft systems is based on a very thin, spiral-shaped
LC oscillating circuit, which is used to radiate into space the high-frequency
electromagnetic waves needed to operate the system. Different radio frequencies
can be configured, but the one that is typically and most widely used is 8.2
MHz. The circuit, which acts as both transmitter and receiver of the waves, is
very simple and at the same time inexpensive. The systems placed near the shop
openings (antennas or anti-theft barriers) work in pairs,
both as source and destination of the signal, so the process is as follows:
·
TRANSMITTING
ANTENNA emits a constant radio
signal in the immediate vicinity
·
The
signal is intercepted by a LABEL or by a TAG
that is sufficiently close
·
If
the label or tag has not been properly disconnected using the appropriate
equipment in the checkout counters (a DEACTIVATOR or a DETACHER respectively),
it will emit an additional signal
· The signal is picked up by the RECEIVER ANTENNA: when it happens, the alarm is triggered.
Anti-theft Systems (Acousto-Magnetic)
Acousto-Magnetic (AM) technology applied to anti-theft systems is the latest and most innovative one on the market. By using this technique, a physical phenomenon called magnetostriction is set in motion, which affects all the Anti-theft accessories used to protect goods.Anti-theft systems with acousto-magnetic (AM) technology are very effective because the receiver is able to analyse the incoming signal and assess whether it actually comes from a compatible anti-shoplifting tag or plate in the shop or whether it is a false alarm.
The anti-shoplifting system with Radio Frequency (RF) technology
offered by IDISEC is therefore a very useful solution for protecting the goods
on display from potential theft and is the ideal choice for a wide range of
businesses.
In this way, the elements
concerned are able to create a pulsed magnetic field.
·
As the LABEL or Anti-Theft
PLATE is placed in a magnetic field, there is a shift in the
distribution of electrons in the metal material (following its magnetisation).
·
As a result, there is a change
in the size of the plates inside the accessory, which begin to vibrate,
expanding and compressing at a rhythmic frequency, which can be
identified as a characteristic signal: this phenomenon is called MAGNETOSTRICTION.
· With magnetostriction, the label or anti-shoplifting plate then emits a signal that is picked up by the system (specifically, by the RECEIVER).
Anti-theft systems with acousto-magnetic (AM) technology are very effective because the receiver is able to analyse the incoming signal and assess whether it actually comes from a compatible anti-shoplifting tag or plate in the shop or whether it is a false alarm.
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| ANTI-THEFT SOFT LABEL |
Anti-Theft Soft Labels:- The electromagnetic antitheft label is specifically designed to prevent theft in stores. The electromagnetic technology used for this very discreet
sticker is widely used for food products, books and on all types of objects.
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| Anti Theft Security TAG |
Anti-Theft Tags: Anti-Theft tag is a small “signal transmitter” that you put on the merchandise that you want to protect. The tag will signal to the EAS antennas to make them alarm if they come to close. E.g. if someone is trying to steal the item and take them through the exit without paying/removing the tag.
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| UHF ANTI-THEFT TAG |
Anti-Theft Antenna:-
RF EAS antennas are most often made of aluminum, based on subtractive aluminum technology on both sides of a plastic support, for example a support made of polypropylene (PP) or of polyethylene terephthalate (PET). These antennas are typically shaped as a coil or as a closed loop. Once the RF EAS antenna has been formed on both sides of the substrate, a bridge must be devised in order to ensure the electrical continuity between the depositions on both sides, typically either by mechanical crimping or by a plated hole (“via”). The RF antenna of the EAS may not be used to resonate with an integrated circuit operating in UHF frequency ranges.
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| Anti Theft Antenna |
In order to hinder the proper operation of the two antennas, even if they are operating in very distant frequency ranges, a minimum separation distance must be maintained between the two antennas. In order to simplify the manufacturing method, the UHF antenna may be made concurrently with the RF EAS antenna.
In one specific embodiment, the EAS antenna and/or the UHF
antenna are manufactured using a mechanical method for metal subtraction, for
example, die cutting.
Another problem solved by the invention relates to the assembling of the UHF integrated circuit with the UHF antenna manufactured concurrently with the RF EAS antenna. Indeed, in order to obtain an optimal performance of the RF EAS antenna and to limit its cost, said antenna is generally deposited onto a substrate made of polypropylene or of PET. On this type of support, interconnection by way of flip-chip technology of an integrated circuit to the UHF aluminum antenna is difficult because, first, polypropylene does not withstand the temperatures needed for properly welding the integrated circuit, and, second, the overall system being highly flexible, the integrated circuit comes off easily when affixed in a conventional manner. These problems are probably the reasons why no one has yet considered depositing the RF EAS antenna and the UHF antenna on the same substrate.