Wi-Fi allows for wireless networking over local areas. There are different types of RFID tags - active tags which contain batteries and communicate over longer distances, semi-passive tags which contain batteries to power the chip but only transmit when receiving a signal, and passive tags which derive power from reader signals. RFID systems operate at different frequencies for various read ranges and data transmission speeds and are used in many applications such as access control, asset tracking, and supply chain management.

1. Wi-Fi
Chan Hok Fung
12210765

2. Introduction
Applications Survey result Conclusion
of Wi-Fi

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RFID
• RFID = Radio Frequency Identification
• Electronic labeling and wireless identification of
objects using radio frequency
• Tag carries with its information
▫ a serial number
▫ Model number
▫ Color or any other imaginable data
• When these tags pass through a field generated by a
compatible reader, they transmit this information
back to the reader, thereby identifying the object

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Types of RFID Tags
Active Tags Semi-passive Tags Passive Tags
• Use a battery • Contain built-in • Derive their power
• communicate over batteries to power from the field
distances of several the chip’s circuitry, generated by the
meters resist interference reader
and circumvent a • without having an
lack of power from active transmitter to
the reader signal transfer the
due to long distance. information stored
• They are different
from active tags in
that they only
transmit data at the
time a response is
received

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Frequency Appx. Read Data Speed Cost Application
Range of
Tags
Low Frequency <5cm Low High • Animal Identification
(125kHz)
(passive) • Access Control
High Frequency 10 cm – 1m Low to Mediu • Smart Cards
(13.56 Mhz) Moderate m to
(passive) Low • Payment (paywave)
Ultra High 3m -7m Moderate to Low • Logistics and Supply
Frequency (433, High Chain
868-928 Mhz) (passive)
• Baggage Tracking
Microwave 10m -15m High High • Electronic toll collection
(2.45 & 5.8 Ghz) (Autotoll)
(passive)
• Container Tracking
20m – 40m
(active)

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Application Representativ Competitive Current Typical Tag Type
Segment e Applications Technologies Penetratio
n
Access Control Doorway entry Other keyless entry High Passive
technologies
Asset Tracking Locating None Low Active
tractors within a
freight yard
Asset Tagging Tracking Bar Code Low Passive
corporate
computing
systems
Authentication Luxury goods Holograms Low Passive
counterfeit
prevention
Baggage Positive bag Bar Code, Optical Low Passive
Tracking matching Character
Recognition
POS SpeedPass Credit Cards, Medium Passive
Applications Smart Cards,
Wireless Phones
SCM (Container Tracking GPS-based Systems Low Active
Level) containers in
shipping
terminals
SCM (Pallet Tracking Bar Code Minimal Active, Passive
Level) palletized
shipments
SCM (Item Identifying Bar Code Minimal Passive
Level) individual items
Vehicle Electronic toll Bar Code, License Medium Active, Passive
Identification collection plate, reader
systems
Vehicle Automotive Other theft High Passive
Immobilizers ignition systems prevention
technologies

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Document Management, 3
Inventory
Control, 4
Security, 3 Customer Services, 2
Hotel Management, 2
Library Management, 8
Other, 7
Banking and Finance, 2
Pharmaceutic
manufacturing Logistics and Supply
industries, 6 Chain Management, 8 Social Services, 1

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