Layout Guidelines; Figure 4. Layout Guidelines - ST SPLML-868 Preliminary Data Sheet

3.3

Layout guidelines

The application PCB requires a flooded ground plane. Care must be taken to ensure
there are no traces or ground planes under the area surrounding the antenna, with the
exception of minimal width traces from pins 1,2,3,4,13,14,15 and 16 of the module if these
are used. It is appropriate to place the module toward the edge of the PCB with no traces
or ground planes from the antenna to the board edge.

Figure 4. Layout guidelines

No copper on any layer surrounding antenna, except
minimal traces from pins 1,2,3,4,13,14,15 and 16
6 mm
6 mm
min .
min .
Flooded ground plane required
(signal traces allowed)
Application PCB
Doc ID TBD Rev 0.8 11/19 R
www.st.com