Ublox NINA-B4 Series, System Integration Manual, Page: 57 / 61

NINA-B4 series - System integration manual
UBX-19052230 - R09 Appendix Page 57 of 61
C1-Public
B.1.1 Floor plan
Figure 24 shows where the critical components and copper traces are positioned on the reference
design.
Figure 24: 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 26
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 microstrip dimensions used in the reference design are shown in Figure 25 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 25: Coplanar microstrip dimension specification
1
2
3
4
5
6