期刊名称：International Journal of Computer Science and Network
印刷版ISSN：2277-5420
出版年度：2019
卷号：8
期号：2
页码：154-156
出版社：IJCSN publisher
摘要：Radio-frequency identification (RFID) tags and tag readers make use of proximity and have automated ad hoc setup for
transferring small amounts of information. The key features of the RFID tag are a fixed unique identifier and necessary proximity of tags
to a tag reader. However, some kinds of RFID tags exist that cycle through a predefined list of identifiers. Also some manufacturers have
developed RFID tags that are compatible with WiFi networks to extend location tracking to a whole WiFi network, avoiding the need for
an extra tracking network. The cheapest variety of RFID tags are called passive, although 'reactive' would be a better term, because they
draw their power to transmit from the radio signal of the tag reader. They are commonly used for tracking the movement of objects,
typically at distances of up to a few metres, but potentially up to 200 metres with 'active' or 'semi-active' tags i.e. with their own power
source. RFID tags are also widely used to control and monitor access through door and gate entry systems and to 'tag' animals and
occasionally people. They are increasingly being used in asset tracking and security applications. The ability to add a unique identifier to
objects that can be tracked is very useful and should lead to further innovations, especially in combination with other technologies.
