User's Manual

GE866-DUAL Hardware User Guide

1VV0301051 Rev. 2 – 2014-04-07

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Reserved. Page 35 of 82

Mod. 0805 2011-07 Rev.2

to the GE866-QUAD through the PCB with the antenna pad (pin

G2).

WARNING:

High Frequency harmonics may still not be sufficiently

attenuated in the GE866’s small package. The suggested Pi

network, between antenna output of the module and antenna

connector on application board, is used to meet the standard

specifications.

In first designs its use is strongly recommended.

In the case that the antenna is not directly developed on the

same PCB, hence directly connected at the antenna pad of the

GE866-QUAD, then a PCB line is needed in order to connect with

it or with its connector.

This transmission line shall fulfill the following

requirements:

ANTENNA LINE ON PCB REQUIREMENTS

Impedance

50 ohm

Max Attenuation

0,3 dB

No coupling with other signals allowed

Cold End (Ground Plane) of antenna shall be equipotential to the

GE866-QUAD ground pins

This transmission line should be designed according to the

following guidelines:

• Ensure that the antenna line impedance is 50 ohm;

• Keep the antenna line on the PCB as short as possible, since

the antenna line loss shall be less than 0,3 dB;

• Antenna line must have uniform characteristics, constant

cross section, avoid meanders and abrupt curves;

• Keep, if possible, one layer of the PCB used only for the

Ground plane;

• Surround (on the sides, over and under) the antenna line on

PCB with Ground, avoid having other signal tracks facing

directly the antenna line track;