Transponder News

Transponder News is written by an expert who has 21 years of hands on experience with RFID technology and systems.

A news service reporting on developments regarding the use of radio based tagging transponder systems for commerce and scientific applications. Covering RFID and EAS technologies as well as magnetic/electric field coupled techniques.

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What you need to know

Choosing the frequency -
The most important decision to be made when choosing an RFID system is the operating frequency as many of the characterisitics you require are defined by the laws of physics. This is particularly true for passive RFID systems( no battery in the transponder) where the laws of physics and local regulations regultate how much one can squeeze out of the performance. For passive transponders the operating frequency choices generally are 125Khz (magnetic), 13.56 MHz (magnetic), 860Mhz to 956 MHz (UHF) (electric) and 2.45GHz ( electric)
Magnetic coupled RFID transponder systems
Electric field RFID transponder systems
Types of RFID systems
The first major catgeory of choice is between active and passive transponders. Active contain a battery to provide their energy, while passive extract energy from the energising field of the reader.Active and passive. For passive transponders a second category of choice is in the type of protocol, being either a Reader-talks-first(RTF) or a Tag-talks-first(TTF) protocol. RTF protocols generate much higher levels of interference compared to TTF protocols meaning fewer readers can operate in close proximity.Comparing protocols
Uses of RFID systems
RFID systems are capable of providing "vision" to computer systems. This means they are found in applications where-ever information is to be gathered automatically for computer networks. RFID is the fourth leg of IT systems, after computers, networks and software. Applications are found in areas such as asset tracking, courier parcel tracking, tyre identification for hire cars, files and book monitoring in buildings, sports timing, logistics, laundry tagging for automatic processing in a centralised laundry, personnel access control, vehicle access control, toll roads, and even in labelling goods in a supermarket trolley. Typical uses of RFID
Unusual applications of RFID Technology 
RFID at present is a rapidly changing technology. Originally transponders were expensive to produce and had very short operating ranges. Recent developments allow cheap UHF transponders to be made that can operate at distances further than 10 meters, read up to 1000 transponders in a zone at a time, and can be produced at prices that make it economical to use them for use in applications that need low price labelling. In this sections we detail trends that are occuring in this industry.Current trends in RFID applications
Future trends for RFID 
RFID in retail
Following a widely shown demonstration of RFID being used to read the contents of a supermarket trolley (cart) in South Africa in 1994, it was realised that the ultimate application of RFID will be the automated scanning of the supermarket trolley.
Although this is now technically possible, the lack of production facilities to produce transponders in sufficient quantities means that this application is still many years away from reality.
"Is it possible to scan a supermarket trolley using RFID?" by Mike Marsh 
Scanning systems for retail?
Technical reports
Tests of the accuracy of RFID-radar and the development of long range transponders
The biggest and fastest item ever scanned with UHF RFID
Recycling for Active Tags and batteries by Dave Miller
Pushing the Range Boundaries in UHF Passive Tags by Mike Marsh 
RFID Coal Tracking Technology By Deryck Lauf
A Modulating Retroreflector as a Passive Radar TransponderBy J.Thornton,D.J.Edwards.
Transponder's sensitivity - a new way to specify UHF transponders? by Mike Marsh 
Dynamic Performance of Passive-Tag Inductive RFID Systems by Michael Beigel
Range versus power and frequency for passive electric coupled tags by Mike Marsh 
Read range for Animal Transponders by S Farnham
Microwave ID by Staffan Gunnarsson
Performance of magnetic coupled Passive Injectable tags by Michael Beigel
Battery Technology choices for RFID Tags by Sol Jacobs 
Process synchronisation using 2.45 GHz RFID by Staffan Gunnarsson
Improved logistics with 2.45 GHz RFID by Staffan Gunnarsson 
Parts of an RFID system
What is a Transponder/What are RFID systems
EAS systems
Multiple article scanning
Single bit, read only, read/write,smartcards and RFDC
Designing RFID systems by Mike Marsh
Communication issues for transponders
Editorial & Interviews
The manufacturing challenge - Where are all those transponders going to come from?
Restrictive RFID power regulations and IT
Compatibility between the US and Europe radio frequency regions for International trade
Can RFID tags replace barcodes cost-effectively?
Transponder News
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Transponder News is edited by Mike Marsh

Last update 7 June 2011

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