User's Manual

HE920 Hardware User Guide
1vv0301014 Rev.9 – 2014-01-23
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 48 of 84
 Keep one layer of the PCB used only for the Ground plane; if possible.
 Surround (on the sides, over and under) the antenna line on PCB with Ground. Avoid
having other signal tracks directly facing the antenna line track.
 The Ground around the antenna line on PCB has to be strictly connected to the main
Ground plane by placing vias once per 2mm at least.
 Place EM noisy devices as far as possible from HE920 antenna line.
 Keep the antenna line far away from the HE920 power supply lines.
 If EM noisy devices are around the PCB hosting the HE920, such as fast switching ICs,
take care of shielding of 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 you do not have EM noisy devices around the PCB of HE920, use a strip line on the
superficial copper layer for the antenna line. The line attenuation will be lower than a
buried one.
6.5.5. GPS/GNSS Antenna – Installation Guidelines
 The HE920, due to its sensitivity characteristics, is capable of performing a fix inside
buildings. (In any case the sensitivity could be affected by the building characteristics
i.e. shielding)
 The Antenna must not be co-located or operating in conjunction with any other antenna
or transmitter.
 Antenna shall not be installed inside metal cases.
 Antenna shall be installed also according antenna manufacture instructions.