Ublox NINA-B3 Series, System Integration Manual

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NINA-B3 series - System integration manual
UBX-17056748 - R13 Appendix Page 68 of 72
C1-Public
B.1.1 Floor plan
This section describes where the critical components and copper traces are positioned on the
reference design.
Figure 31: NINA-B301/B311 antenna reference design
Reference Part Manufacturer Description
1 NINA-B301/B311 u-blox NINA-B3 module with antenna pin
2 U.FL-R-SMT-1(10) Hirose Coaxial connector, 0 – 6 GHz, for 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 top layer GND-trace. See also Figure 33.
6 Copper keep-out Keep this area free from any copper on the top layer
Table 15: 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 32 and
Table 16 . 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’ shall surround at l east 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 32: Coplanar micro-strip dimension specification
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