ZED-F9T - Integration Manual
For FR-4 PCB material with a dielectric permittivity of for example 4.7 we can calculate the trace
width at 1575 MHz for 50 Ω impedance.
A grounded co-planar RF trace is recommended as it provides the maximum shielding from noise
with adequate vias to the ground layer.
The RF trace must be shielded by vias to Ground along the entire length of the trace and the ZED-
F9T high accuracy timing receiver RF_IN pad should be surrounded by vias as shown in the figure
below.
Figure 38: RF input trace
The RF_IN trace on the Top layer should be referenced to a suitable ground layer.
4.7.3.2 Vias for the ground pads
The ground pads under the ZED-F9T high accuracy timing receiver need to be grounded with vias to
the lower ground layer of the PCB. A solid ground layer fill on the top layer of the PCB is recommended.
This is shown in the figure below.
Figure 39: Top layer fill and vias
UBX-19005590 - R01
4 Design
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