Telit Wireless Solutions HE910 - Page 54

HE910 Hardware User Guide
1VV0300925 Rev. 32 Page 54 of 111 2019-11-25
• The ground surrounding the antenna line on PCB has to be strictly connected to
the main Ground Plane by means of via holes (once per 2mm at least), placed
close to the ground edges facing line track;
• Place EM noisy devices as far as possible from HE910 antenna line;
• Keep the antenna line far away from the HE910 power supply lines;
• If EM noisy devices are present on the PCB hosting the HE910, 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 shield it with a metal frame
cover.
• If EM noisy devices are not present around the line, the use of geometries like
Microstrip or Grounded Coplanar Waveguide has to be preferred, since they
typically ensure less attenuation if compared to a Stripline having same length;