Ublox NINA-B4 Series, Руководство по системной интеграции, Страница: 56 / 61

NINA-B4 series - System integration manual
UBX-19052230 - R09 Appendix Page 56 of 61
C1-Public
B Antenna reference designs
Designers can take full advantage of the Single-Modular Transmitter certification approval of
NINA-B4 by integrating the u-blox reference design for these modules into their products. This
approach requires compliance with the following rules:
• Only listed antennas can be used. For the list of approved antennas, see also the NINA-B4
certification, application note [8] .
• Schematics and parts used in the design must be identical to the reference design. Use only parts
validated by u-blox for antenna matching.
• PCB layout must be identical to that provided by u-blox. Implement one of the reference designs
described in this appendix or contact u-blox.
•
The designer must use the PCB stack-up provided by u-blox. RF traces on the carrier PCB are part
of the certified design.
All available designs are described in this appendix.
B.1 Reference design for external antennas (U.FL connector)
When using NINA-B401/B411 modules together with this antenna reference design, the circuit
trace layout must be made in strict compliance with the instructions given in this section.
Components connected to the RF trace must be kept as shown in the reference design. The
reference design uses a surface-mounted U.FL micro coaxial connector to which the external
antenna plugs through a 50
Ω
coaxial cable, as shown in Figure 23 .
Figure 23: Antenna reference design