In this video I talk about NFC antenna coil design and how I applied the concepts to put my contactless payment card into a 3d printed wearable ring.

References:

NFC TagInfo Android App by NXP
https://play.google.com/store/apps/details?id=com.nxp.taginfolite&hl=en_GB

Coil inductance calculator:
http://www.eeweb.com/toolbox/coil-inductance

LC resonance frequency calculator:
http://www.1728.org/resfreq.htm

PCB NFC antenna design tool by ST:
http://www.st.com/web/en/catalog/mmc/FM76/CL1766/SC1412/

Some application notes with much more information on the subject:
http://ww1.microchip.com/downloads/en/AppNotes/00710c.pdf
http://www.st.com/st-web-ui/static/active/cn/resource/technical/document/application_note/CD00221490.pdf

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