I'm designing a small board that integrate a PN512 IC along with other components (MCU, etc). I need to build a proof-of-concept device for a presentation with the suit people and everything is ready but the PN512 antenna/matching circuit design. My guidelines for a PCB antenna are:
- It must be single layer. (I've seen single layer designs with a 0 ohm resistor as a jumper over the traces)
- It can't be more than 10x10cm or 4x4in.
- I need it to successfully transmit data between the PN512 and an external NFC device, 5cm (2 in) or less range will be more than fine.
- I own a 200MHz scope to play with (Sadly, no network analyzer).
- My knowledge of the "black magic" behind this is very limited, but I'm learning as i go.
So my question is:
It is possible to build an antenna with the above requirements? Do you know of any (open) design available to get as starting point?
I've found many design guides for 2.4GHz antennas, but nothing helpful for the 13.56MHz range. Any help will be highly appreciated!