Presently, my problem is that I have this NFC/RFID Tag, and due to the small antenna on the tag, it needs to make direct contact with the reader (presently tested using both a smartphone w/ NFC capabilities, as well as a cheap HF RFID reader module connected to an Arduino UNO).
My project requires an extremely small NFC/HF RFID tag that can be read from about 1-2mm, through a layer of material. For an easier visual understanding, it is as if the reader is in your pocket, and it would have to pick up the tag through the material. Presently, this is just thick enough that I cannot get consistent results.
So my question is - is it physically impossible for me to ever read this tag given my constraints? Or, would increasing my read range help at all? Not sure how I would amplify my range on the smartphone, but I'd imagine a different antenna on the HF Reader would do the trick there.
If it is a matter of physical limitations, is there an alternative I am not thinking of? NFC/RFID is not an absolute requirement, as I am not trying to read data off the tag. I am using the presence of the tag within the reader's field to trigger an event, and I cannot think of a better technology that could potentially identify something that is so small/discreet nearby without being within a direct line of sight. So if there are any suggestions for an alternative, I am more than willing to modify my design to accommodate. Likewise, I am not tied to this particular tag if there exists a better one of comparable dimensions.
Thanks in advance for any suggestions/references!