Hardware Manual

GEM3NFC Considerations
Mechanical items (especially metal) should be kept as far as possible from the module
antenna in all directions, including above and below the board surface. If possible, move
mechanical items out and away from a keepout area of 53mm x 20mm from the GEM3NFC
module edge.
Antenna Characteristics
The GEM3NFC module includes an integrated monopole chip antenna. Antenna
performance will depend on host PCB layout. The following plots show antenna radiation
pattern of the GEM3NFC antenna.
2.4GHz 2.442GHz 2.484GHz
Antenna Performance
Efficiency
Peak Gain
S11
2400MHz
65.72%
4.08 dBi
-16.0 dB
2442MHz
62.72%
3.95 dBi
-14.8 dB
2484MHz
59.73%
4.17dBi
-13.3 dB