Can an NFC phone be uniquely identified by an NFC reader?

Are there any solutions available where a smartphone can be identified by a separate NFC reader, allowing a specific phone to be identified to, say, open an automated door? (This is reverse of having an NFC reader within the phone.) —Name withheld ——— Actually, NFC...

Can we use UHF tags and readers at other frequency ranges?

Can we use UHF tags and readers at other frequency ranges, such as LF, HF and microwave? Do the the readers and tags operate independent of frequency range? — No. Readers are designed to operate at a specific frequency or frequency range and can only communicate...