Integration Manual

ANNA-B4 series - System integration manual
UBX-21000517 - R03 Appendix Page 66 of 76
C1-Public
B Antenna reference designs
Designers can take full advantage of the ANNA-B4 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. For the list of approved antennas, see section Approved
antennas.
• Schematics and parts used in the design must be identical to those used in the u-blox reference
design. RF components may show different behavior at the frequencies of interest due to different
construction and parasitic; use only parts validated by u-blox for the antenna matching.
• PCB layout must be identical to that provided by u-blox. Implement one of the reference designs
included in this section or contact u-blox.
• The designer must use the stack-up provided by u-blox. RF traces on the carrier PCB are part of
the certified design.
Three different reference designs are available:
• Design the internal antenna with the module in the corner of the PCB
• Design the internal antenna with the module along the edge of the PCB
• Include an external antenna into the design with a short trace to a U.FL connector
B.1 Internal antenna reference design with module at PCB corner
When using the ANNA-B4 together with this antenna reference design, the circuit trace layout must
be made in strict compliance with the instructions below.
This section describes where the critical copper traces are positioned on the reference design. It is
important not to route any traces in any layer in the antenna strip clearance area.