What is the minimum antenna size that an NFC reader device can have?

[selvaraj_karupp]

What is the optimum NFC antenna size for NFC reader device? The reader should be able to identifiy commonly used tags and Mobile devices.

What is the Minimum clearance required between the NFC antenna and adjacent Metal part?

[jimmychan]

I think this article may useful for you.

https://nfc.today/advice/nfc-tag-sizes