Magnetic Fields & RFID: Rolling to Detect

[temujin]

Hi

First, I´m new in this forum so I´m not sure if I´m posting in the right place. If I don´t...well, sorry.

Then my question...I´ll try to explain.

I´m playing with an inductively coupled RFID-reader and smart labels.
Holding the smart label 90 degrees with respect to the antenna, the smart label will not be detected.
However, if I "roll" the smart-label (sort of giving it the shape of a cigarette) it is detected even though I hold it 90 degrees with respect to the antenna.

Why does this happen?
Are additional magnetic fields created when a smart - tag is "rolled"

I hope my question was clear...hard to explain without pictures.


thanks in advance

t.

 

[Antiphon]

When it is perpendicular you are not coupling enough energy to the loop antenna
to activate the system. When you roll it, its much like tilting it and you can couple
to the tilted or rolled antenna.

 

[ravenprp]

Hi there,

Welcome to the forum! Your question is very interesting and I'll do my best to answer it.

First, let's talk about how RFID works. RFID stands for Radio Frequency Identification and it uses radio waves to communicate between a reader and a tag. The reader sends out a radio wave signal, which is picked up by the tag's antenna. The tag then sends back a unique identifier code to the reader. This communication happens through electromagnetic energy.

Now, let's talk about magnetic fields. Magnetic fields are created by electric currents and can be used to transfer energy or information. In the case of RFID, the reader's antenna creates a magnetic field, which the tag's antenna picks up and uses to power itself and communicate with the reader.

So, why does rolling the smart label make a difference? When you roll the smart label, you are essentially changing the orientation of the tag's antenna with respect to the reader's antenna. This can affect the strength and direction of the magnetic field that the tag's antenna is able to pick up. By changing the orientation, you may be aligning the tag's antenna better with the reader's antenna, making it easier for the tag to pick up the magnetic field and communicate with the reader.

Additionally, when you roll the smart label, you are also changing the shape and size of the tag's antenna. This can also affect the strength and direction of the magnetic field that the tag's antenna is able to pick up. It's possible that the rolled shape of the tag's antenna is able to pick up the magnetic field more efficiently than when it is held flat.

In conclusion, rolling the smart label can affect the magnetic fields that are created and picked up by the reader and tag, potentially making communication between the two more efficient. I hope this helps answer your question. Feel free to ask for clarification or more information if needed.