User Guide

ME310G1 Hardware User Guide
1VV0301588 Rev. 4 Page 49 of 77 2020-01-21
Input power
ME310G1-W1: > 24dBm Average power
ME310G1-WW: > 33dBm Average power
VSWR absolute max
≤ 10:1 (limit to avoid permanent damage)
VSWR recommended
≤ 2:1 (limit to fulfill all regulatory requirements)
6.3.1. PCB Design guidelines
When using the ME310G1, since there's no antenna connector on the module, the antenna
must be connected to the ME310G1 antenna pad by means of a transmission line
implemented on the PCB.
This transmission line shall fulfil the following requirements:
Item
Value
Characteristic Impedance
50 ohm (+-10%)
Max Attenuation
0.3 dB
Coupling
Coupling with other signals shall be avoided
Ground Plane
Cold End (Ground Plane) of antenna shall be
equipotential to the ME310G1 ground pins
The transmission line should be designed according to the following guidelines:
• Make sure that the transmission line’s characteristic impedance is 50ohm ;
• Keep line on the PCB as short as possible, since the antenna line loss shall be less
than about 0.3 dB;
• Line geometry should have uniform characteristics, constant cross section, avoid
meanders and abrupt curves;
• Any kind of suitable geometry / structure (Microstrip, Stripline, Coplanar, Grounded
Coplanar Waveguide...) can be used for implementing the printed transmission line
afferent the antenna;
• If a Ground plane is required in line geometry, that plane has to be continuous and
sufficiently extended, so the geometry can be as similar as possible to the related
canonical model;
• Keep, if possible, at least one layer of the PCB used only for the Ground plane; If
possible, use this layer as reference Ground plane for the transmission line;
• It is wise to surround (on both sides) the PCB transmission line with Ground, avoid
having other signal tracks facing directly the antenna line track.
• Avoid crossing any un-shielded transmission line footprint with other signal tracks
on different layers;