Trimble Outdoors 58052-00 Benutzerhandbuch

Copernicus GPS Receiver     7 5

RF LAYOUT CONSIDERATIONS     6

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Figure 6.3

Stripline Transmission Lines

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The stripline topology requires three PCB layers: two for ground planes and 
one for signal. One of the ground plane layers may be the layer to which the 
Copernicus GPS module is mounted. If this is the case, 

•

The top layer must be flooded with ground plane and connected to all ground 
castellations on the Copernicus GPS module. 

•

The RF input should be connected to the signal layer below using a via. 

•

The layer below the signal layer is the second ground plane. 

•

Connect the two ground planes with vias typically adjacent to the signal trace.

•

Other signals of the Copernicus GPS module may be routed to additional layer 
using vias.

For the symmetric stripline topology where the signal trace is equal distance from 
each ground plane, the following table applies:.

Table 6.2

Typical track widths for an FR4 material PCB substrate in Stripline topology

1.6

0.631

1.2

0.438

1.0

0.372

FR4

4.6

0.8

0.286

0.6

0.2

0.4

0.111

0.2

N/A