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RFID,which is the abbreviation of Radio-Frequency IDentification
is of great importance and use in our modern society. RFID is a
kind of electronic devices that is made of a chip which is
not big and an antenna. RFID requires the chip a maximum capacity
of two thousands of bytes of date.
The RFID device is made to have the same purpose with the a
magnetic strip of a automatic teller machine card ,that is ATM
card.What's more, RFID device has no choice but to be scanned in
orde to gain the identifying information.
Though, RFID tags and barcodes both serve to the same purpose of
carrying information of products.It seems that RFID is superior to
Barcodes in several aspects.First and foremost,RFID device can be
placed around the scanner instead of beening placed precisely
relative to it. A barcode sometimes can not be read just because it
is positioned not in the exact place.In addition, RFID tags are
able to be read at a much longer distances and an RFID reader can
work properly even if it is up to three hundred feet away from the
tag.In contrast, the distance to read a barcode is far less,
typically less than fifteen feet.Last but not least, RFID tags is
not only a read device but also a write device.Consumers of RFID
have the chance to communicate with each other by using the tag and
to change information as much as they can,since the tag design
permits it to happen.
Then does RFID work? RFID is usually made up of three parts:
the RFID tag,which is also called a transponder, a transceiver
which is used to interpret the data, a scanning antenna. The
scanning antenna which could be always positioned to a
surface offers us radio-frequency signals to achieve two
thing: one thing is ,it enabled us to communicate with the RFID
tag,the other thing is that the RF radiation supply the
Radio-Frequency IDentification tag with energy to communicate. RFID
tags,sometimes can function well without batteries and it can be
usable even if it is a long period of time.
Now,everything has its own advantages and disadvantages.Now, there
are some shortcomings of RFID.First and formost,the public are easy
to get confused with RFID Standards for RFID was implemented in
various ways and was managed by at least one manufacturer and the
global standards is not completed.Secondly, RFID systems has the
risk of being disrupted easily. Since the electromagnetic spectrum
was used in RFID systems, it usually happens that RFID systems are
not difficult to jam while making use of the right frequency.Third,
there are RFID reader collisions.When there are signals coming from
2 or more than 2 readers overlap,there will comes the RFID reader
collisions.Then tag will have no response to simultaneous
queries. Last but no least,tag collision are easy to occur when too
many tags are placed in one small area.However,it is not so
difficult to slove this problem for the read speed is very
quick,and vendors will develop systems to make it possible for tags
to respond one at a time.
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