Specifications

WM_PRJ_Q2501_PTS_002 - 001
March 2004
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4.2.5 RF circuit routing constraints
4.2.5.1 General recommendations
If RF signals need to be routed on the application board, the following
recommendations must be observed for the PCB layout:
 The RF signals must be routed using traces with 50 Ω characteristic
impedance.
Basically, the characteristic impedance depends on: the dielectric, the
width of the trace and the height between the ground plane.
In order to respect this constraint, WAVECOM recommends to use
MicroStrip or StripLine structure and compute the Trace width with a
simulation tool (like AppCad shown in the Figure below and that is
available free of charge at the following internet address:
http://www.agilent.com
).
Figure 38: AppCad Screenshot for MicroStrip design