Trimble Outdoors 58052-00 Benutzerhandbuch

6      RF LAYOUT CONSIDERATIONS

7 2      Copernicus GPS Receiver

The following items need to be considered for the Copernicus GPS Receiver RF 
layout: 

•

PCB track connection to the RF antenna input must have impedance of 50 
ohms.

•

PCB track connection to the RF antenna input must be as short as possible.

•

If an external antenna is used, PCB track connection to the RF antenna input 
must transition from the circuit board to the external antenna cable, which is 
typically a RF connector. 

•

 If there are any ground planes on the same layer as the microstrip trace, please 
refer to the Coplaner Waveguide design. Not covered in this manual.

•

PCB track connection to the RF antenna input must be routed away from 
potential noise sources such as oscillators, transmitters, digital circuits, 
switching power supplies and other sources of noise.

•

RF and bypass grounding must be direct to the ground plane through its own 
low-inductance via 

•

Active or passive antennas may be used. If using a passive antenna the 
connection to the antenna input shall be very short. It is possible to mount the 
patch antenna on the same PCB as the Copernicus GPS module. Designers 
must be aware of noise generating circuitry and proper design precautions 
taken (shielding,.).

The PCB track connection to the RF antenna input must not have:

•

Sharp bends.

•

Components overlaying the track.

•

Routing between components to avoid undesirable coupling.