Ant2N
Newbie level 1
Hi everybody,
I am currently designing an NFC reader with a PN532 chip from NXP (which is one of the requirements of my circuit). I plan to draw a rectangular loop inductor on the PCB which would approximately occupy a 3x3 cm square (up to 4x4 cm). There will be other components on this PCB such as an LED driver, some LEDs, etc. The main micro-controller will stand on a separate PCB and will communicate with this board through an SPI link. Space is the main constraint: the volume occupied by the PCB has to be minimized as much as possible.
I read the NXP Antenna Design Guide https://eng.utah.edu/~mlewis/ref/NFC/AN1445.pdf carefully and I have very specific questions related to the design of the PCB that will carry the NFC controller and antenna:
- Could it be acceptable to put the components (NFC controller, LED driver) on the same PCB as the NFC antenna? What would be the "best" position relatively to the antenna in this case? (i.e. one that would limit eddy currents and inductance increase)
- How to efficiently shield the main controller board? Will a sheet of copper do the job (instead of ferrite)?
- Is there an advantage to have different length and width for the antenna?
Thanks a lot for your help!
I am currently designing an NFC reader with a PN532 chip from NXP (which is one of the requirements of my circuit). I plan to draw a rectangular loop inductor on the PCB which would approximately occupy a 3x3 cm square (up to 4x4 cm). There will be other components on this PCB such as an LED driver, some LEDs, etc. The main micro-controller will stand on a separate PCB and will communicate with this board through an SPI link. Space is the main constraint: the volume occupied by the PCB has to be minimized as much as possible.
I read the NXP Antenna Design Guide https://eng.utah.edu/~mlewis/ref/NFC/AN1445.pdf carefully and I have very specific questions related to the design of the PCB that will carry the NFC controller and antenna:
- Could it be acceptable to put the components (NFC controller, LED driver) on the same PCB as the NFC antenna? What would be the "best" position relatively to the antenna in this case? (i.e. one that would limit eddy currents and inductance increase)
- How to efficiently shield the main controller board? Will a sheet of copper do the job (instead of ferrite)?
- Is there an advantage to have different length and width for the antenna?
Thanks a lot for your help!