LE910Cx Hardware Design Guide
1VV0301298 Rev.40 Page 68 of 149 2023-03-16
Not Subject to NDA
7.5.4. GNSS Antenna – PCB Line Guidelines
Ensure that the antenna line impedance is 50 Ohm.
Keep the line on the PCB as short as possible to reduce the loss.
The antenna line must have uniform characteristics, constant cross section,
avoiding meanders and abrupt curves.
Keep one layer of the PCB used only for the Ground plane; if possible.
Surround (on the sides, top and bottom) the antenna line on the PCB with Ground.
Avoid having other signal tracks directly facing the antenna line track.
The Ground around the antenna line on the PCB must be strictly connected to the
main Ground plane by placing vias at least once per 2mm.
Place EM-noisy devices as far away from the LE910Cx antenna line as possible.
Keep the antenna line far away from the LE910Cx power supply lines.
If there are EM-noisy devices, such as fast switching ICs, around the PCB hosting
the LE910Cx, ensure shielding the antenna line by burying it inside the layers of
PCB and surrounding it with Ground planes; or shield it with a metal frame cover.
If you do not have EM-noisy devices around the PCB of LE910Cx, use a Micro strip
line on the surface copper layer for the antenna line. The line attenuation will be
lower than a buried one.
7.5.5. GNSS Antenna – Installation Guidelines
The LE910Cx, due to its sensitivity characteristics, is able to perform a fix inside
buildings. (In any case, the sensitivity could be affected by the characteristics of
the building, that is shielding.)
The antenna must not be co-located or operating in conjunction with any other
antennas or transmitters.
The antenna must not be installed inside metal cases.
The antenna must be installed according to the antenna manufacturer’s
instructions.
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