User Manual

ZE51/61-2.4 RF Module User Guide
1VV0300868 Rev.4 – 31/03/2011
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 37 of 50
VI.4. Antenna connection on Printed Circuit Boards
Special care must be taken when connecting an antenna or a connector to the module. The RF output impedance
is 50 ohms, so the strip between the pad and the antenna or connector must be 50 ohms following the tables
below. Ground lines should be connected to the ground plane with as many vias as possible, but not too close to
the signal line.
PCB material PCB thickness H (mm) Coplanar line W (mm) Coplanar line G (mm)
FR4
0.8 1 0.3
1.6 1 0.2
Table 1 : Values for double face PCB with ground plane around and under coplanar wave guide (recommended)
PCB material PCB thickness H (mm) Coplanar line W (mm) Coplanar line G (mm)
FR4
0.8 1 0.22
1.6 1 0.23
Table 2 : Values for simple face PCB with ground plane around coplanar wave guide
(not recommended)