The purpose of the shielding ground of the PN532 RFID antenn

Adafruit Ethernet, Motor, Proto, Wave, Datalogger, GPS Shields - etc!

Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.
Locked
User avatar
ozanyds
 
Posts: 6
Joined: Fri Sep 28, 2018 10:55 am

The purpose of the shielding ground of the PN532 RFID antenn

Post by ozanyds »

Hi,

I have a question about the RFID antenna on the PN532 Breakout board.

Can anyone provide me some information on how does the shielding conductor positioned on the opposite layer of the antenna loop serve in terms of antenna performance (See the picture attached, the substrate is transparent to make the top and bottom layers visible simultaneously)? I am trying to understand the reasoning of this additional shield since it is usually not common to have it in 13.56 MHz RFID antennas (at least what I have seen from the other differential antenna design I was able to see so far).

Is it for reducing the possible unwanted radiation for interference reasons? But this should not be a problem since the 13.56MHz band is ISM band, right? The shielding also cannot block to the radiation on the opposite side of RFID antenna since we are dealing with magnetic fields for such short distances rather then electromagnetic radiation.

Can anyone help me understand technical-wise reasoning maybe?

Thanks a lot.
Attachments
PN532 breakout board RFID antenna.png
PN532 breakout board RFID antenna.png (74.75 KiB) Viewed 148 times

Locked
Please be positive and constructive with your questions and comments.

Return to “Arduino Shields from Adafruit”