LEA-M8S / LEA-M8T - Hardware integration manual
UBX-15030060 - R06
Product handling
Page 29 of 33
Production information
Maintaining a good grounding concept in the design
Shielding
Layout optimization
Filtering
Placement of the GNSS antenna
Adding a CDMA, GSM, WCDMA band pass filter before handset antenna
Out-band interference
Out-band interference is caused by signal frequencies that are different from the GNSS carrier (see
Figure 19). The main sources are wireless communication systems such as cellular, CDMA, WCDMA,
Wi-Fi, BT, and so on.
Figure 19: Out-band interference signals
Measures against out-band interference include maintaining a good grounding concept in the design
and adding a SAW or band pass ceramic filter (as recommend in section 4) into the antenna input line
to the GNSS receiver (see Figure 20).
Figure 20: Measures against in-band interference
