Some researchers are writing about this technology and saying that it has problems with interference when the product is wet or is placed where we find metal structures, as warehouses.
As far as I know RFID will always have problems with metal - it can't see through metal, and metal reflects and causes dead spots. Water will always be a problem for UHF, but HF and below can see through water because they use the magnetic near-field. Low-frequency tags may even be readable through thin metal foil.
See the note below, for example
http://www.ti.com/lit/wp/slyy056/slyy056.pdf
Dear Mehdi Imani,
Thank you for your feedback. Do you know or wrote any paper about these problems?
Regards,
I don't know any direct references, but you could try reading articles on electromagnetic shielding and EMC, which is the other side of the problem - which materials stop electromagnetic signals, and how much of the signal gets through , or round, boxes or barriers..
What you want to know is a problem that runs through all communications and radar technology.
Thank, Malcolm, I”ll search articles ablutor thlê-se subjects. I”m supervising an undergraduate thesis, which is about RFID use in hospitals.
There is a good recent paper talking about the interference of other signals on the UHF RFID system as per the attached file.
Thank you very much, Mr. El-Awamry, I downloaded it and will read.
Regards,
Priscilla Ribeiro
Hello Priscilla Cristina Cabral Ribeiro ,
Very interesting question. While UHF tags do face issues with penetration in metals and water as most of their energy gets absorbed, there is an other interesting type of passive tag based on Surface Acoustic Wave (SAW) technology. SAW RFID tags can work excellently even in the presence of metallic as well as under multi-path environments, owing to their acoustic delay line which also contributes to the total time taken for the signal to be received at the RFID reader. I would highly suggest you to go through this article to clear most of your doubts.
Article A Comparative Survey on Silicon Based and Surface Acoustic W...
All the best.
This system works on different frequencies like low-frequency LF (125 – 135 kHz), high-frequency HF (13.65 MHZ) and, Ultra-high frequency (868-928 MHz) according to the requirements and applications.
High-frequency tags work fairly well on objects made of metal and can work around goods with medium to high water content. Typically, HF RFID systems work in ranges of inches, but they can have a maximum read range of about three feet (1 meter).
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