Sierra Wireless AirPrime XA1110, Hardware Design Manual, Page: 18 / 36

Hardware Design Guide
Rev 3.0 Aug.19 18 41111116
Figure 2-16: GNSS Module with a Clean GND Plane
Don’t place any trace such as I
2
C (SCL/SDA), SPI (CLK/MISO/MOSI), UART (TX/
RX) underneath the GNSS module, otherwise it will cause a sensitivity decrease.
For XA1110
To avoid the interference, place many vias on the two sides of the RF trace which
goes from the module to the SMA/RF connector on your system PCB as
illustrated in
Figure 2-17 below.
Don’t place any high-speed traces such as I
2
C (SCL/SDA), SPI (CLK/MISO/
MOSI), UART (TX/RX) underneath the GNSS module.
Figure 2-17: GNSS Antenna Module with Clear GND Plane