User's Manual

SC14CVMDECT SF Cordless Voice Module
© 2012 Dialog Semiconductor B.V. 42 July 1, 2014 v1.6
7.4 MODULE PLACEMENT ON THE MAIN BOARD
In order to ensure FCC compliance, proper coverage
and to avoid detuning of the antennas, it is required to
place the module free on the main board in relation to
other surrounding materials.
Keep a distance of at least 10 mm from the antenna
elements to conducting objects and at least 5 mm to
non-conducting objects.
Keep in mind that electrical shielding objects, even
partly surrounding the antennas, will normally cause a
significant degradation of the coverage.
Place the module at the edge of the main-board as
shown in Figure 37.
If the module has to be placed away from the edge of
the main board, then avoid conducting areas in front of
the antennas and make a cut-out in the main board
underneath the antennas as shown in the figure.
Keep solid ground on layer 2 out to the edges of the
main board as shown in the figure.
7.5 PATTERN FOR PIN 79 ON THE MAIN BOARD
The copper pattern for pin 79 on the main board is very
important because it is part of the internal antenna of
the module. It is used to extend the internal antenna for
optimum RF performance.
The PCB pattern shown in Figure 41 under “pads C”
for pin 79 on the main board was used during module
certification.
7.6 PRECAUTIONS REGARDING UNINTENDED
COUPLING
The SC14CVMDECT SF includes the internal antenna,
so by integration on the main board precautions shall
be taken in order to avoid any kind of coupling from the
main board to the RF part of the module.
If there is any doubt about this, a brief radio test should
be performed.
Figure 37 Module placement on the main board (top view)
1 78
No PCB area
2
3 76
77
GND
GND GND
79
Main boardModule
antenna extension
> 10 mm
> 10 mm
> 10 mm