NINA-B3 series - System integration manual
UBX-17056748 - R13
Appendix
Page 69 of 72
C1-Public
Table 16: Coplanar micro-strip specification
☞
The GND spacing requirements of the NINA ANT and U.FL connector RF pins are greater than the
spacing requirement of a 50
Ω
coplanar micro-strip. However, at the conductor width and height
specified in
the increased spacing to GND does not affect the trace impedance
significantly for short trace lengths. Therefore, the impedance will still be close to 50
Ω
.
Figure 33: RF trace and minimum required GND trace of the U.FL antenna connector reference design. Dimensions are
shown in mm.
Reference
Item
Value
S
Spacing
200 +/- 50
μ
m
W
Conductor width
300 +/- 30
μ
m (match as close to 50
Ω as possible)
T
Copper and plating/surface
coating thickness
35 +/- 15
μ
m
H
Conductor height
150 +/- 20
μ
m
ε
r
Dielectric constant
(relative permittivity)
3.77 +/- 0.5 @ 2 GHz
