User Guide

ME910G1 HW Design Guide
1VV0301593 Rev.7 Page 65 of 98 2021-02-02
• Keep the antenna line far away from GSM RF lines.
• If there are noisy EM devices around the PCB hosting the module, such as fast
switching ICs, take care of the shielding of the antenna line by burying it inside the
layers of PCB and surround it with Ground planes, or shielding it with a metal
frame cover.
• If there are not noisy EM devices around the PCB hosting the module, use a strip-
line on the superficial copper layer for the antenna line. The line attenuation will
be lower than a buried one.
Hardware-based solution for GNSS and LTE coexistence
When a stand-alone GNSS receiver is present in the user application, the LTE
transmission may desensitize the GNSS receiver in particular if the decoupling between
the LTE and GNSS antennas is low. A SAW filter can be added on LTE side, to protect
GNSS receiver from LTE out-of-band emissions, as described in the schematic below.
When the GNSS receiver embedded in the ME910G1 module is used, there is no condition
for degradation, since the LTE part and the GNSS part are never active simultaneously,
therefore the filtering on the LTE side is not needed.
Figure 22: Reference schematic