Integration Manual

NINA-B4 series - System integration manual
UBX-19052230 - R09 Appendix Page 56 of 60
C1-Public
B.1.1 Floor plan
Figure 22 shows where the critical components and copper traces are positioned on the reference
design.
Figure 22: NINA-B401/B411 antenna reference design
Reference
Part
Manufacturer
Description
1
NINA-B401/B411
u-blox
NINA-B4 module with antenna pin
2
U.FL-R-SMT-1(10)
Hirose
Coaxial connector with shield cutoff frequency of 0–6 GHz for
plugging the external antenna.
3
Carrier PCB
Should have a solid GND inner layer underneath and around the
RF components (vias and small openings are allowed)
4
RF trace
Antenna coplanar microstrip matched to 50 Ω
5
GND trace
Minimum required for top-layer GND trace, as shown in Figure 24
6
Copper keep-out area
Keep this area free from any copper on the top layer
Table 22: Included parts in the antenna connector design
B.1.2 RF trace specification
The 50 Ω coplanar micro-strip dimensions used in the reference design are shown in Figure 23 and
Table 23. GND stitching vias should be used around the RF trace to ensure a proper GND connection.
No other components are allowed within this area.
The solid GND layer beneath the “top layer” must surround at least the entire RF trace and connector.
No signal traces are allowed to be routed on the GND layer within this area, but vias and small openings
are allowed.
Figure 23: Coplanar micro-strip dimension specification
1
2
3
4
5
6