I'm using NFC tags on a poster. The tags are actually behind the poster but I'd like a longer scan distance in the region of 15cm. Is it possible if I use more than one tag ?
How can I increase the scan distance of my NFC tag ?
You can't. The scan distance of an NFC tag can't be increased.
You have two options. First, use a large NFC tag (around 4cm) and place it as close to the user as possible. For example, if the poster is behind glass then try and put some padding behind the poster to push the poster towards the glass (or put the sticker on the glass of course).
Second, you can put NFC tags in an array where you put three or four of them next to each other. This will not increase the scan distance but will increase the hotspot area so the user doesn't have to be so exact. Some users who have tried this have commented that it can cause intermittent responses if the phone hits the spot between the tags and moves a little. However, on balance, it's a reasonable trick.
Hmm I am trying to get back the tag manufacturer info, the phones are android, samsung5. samsung6? Do you know which smartphones yield better results?