User's Manual

HE910 Hardware User Guide

1vv0300925 Rev.28 – 2015-06-24

• 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;