NINA-B3 series - System integration manual
UBX-17056748 - R13 Appendix Page 67 of 72
C1-Public
B Antenna reference designs
Designers can take full advantage of NINA-B3’s Single-Modular Transmitter certification approval by
integrating the u-blox reference design into their products. This approach requires compliance with
the following rules:
• Only listed antennas can be used. Refer to NINA-B3 series data sheet [2] for the listed antennas.
• 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 the one provided by u-blox. Implement one of the reference designs
described in this section 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.
The available designs are presented in this section.
B.1 Reference design for external antennas (U.FL connector)
When using the NINA-B301/B311 together with this antenna reference design, the circuit trace
layout must be made in strict compliance with the instructions below.
Components connected to the RF trace must be kept as indicated in the reference design. The
reference design uses a U.FL micro coaxial connector to connect the external antenna via a 50 Ω
coaxial cable.
Figure 30: Antenna reference design
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