u-blox ANTARIS 4 User Manual


GPSModules-SystemIntegrationManual(SIM)(incl.ReferenceDesign) Design-In
GPS.G4-MS4-05007-A1
  Page 54
your position is our focus
3.6.3 Placement
The placement of the ANTARIS
®
4 GPS Receiver on the PCB is very important to achieve maximum GPS
performance. The connection to the antenna must be as short as possible to avoid jamming into the very
sensitiveRFsection.
Make sure that RF critical circuits are clearly separated from any other digital circuits on the system
 board. To
achievethis,positionthereceiverdigitalparttowardsyourdigitalsectionofthesystemPCB.
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Non 'emitting'
circuits
PCB
Digital & Analog circuits
Non
'emitting'
circuits
Antenna
Digital Part
RF Part
RF
'emitting'
circuits
PCB
Digital & Analog circuits
RF
'emitting'
circuits
Antenna
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Digital Part
RF Part
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Figure 42: TIM placement
3.6.4 Antenna Connection and Grounding Plane Design
apassivepatchantennaoranactiveantenna.TheantennaRFconnection
is on the PCB and connects the RF_IN pin with the antenna feed point or the signal pin of the connector,
ANTARIS
®
4canbeeitherconnectedto
respectively.Figure 43 illustratesconnection to a typical five-pinRFconnector.One can
 also see the improved
shielding for digital lines according to the discussion in Section1.6.3. Depending on the actual size of the
ground area,additional vias should be placed in the outer region. In particular, the edges of the ground area
shouldbeterminatedwithadenselineofvias.
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u-blox ANTARIS 4 Specifications

General

Brand	u-blox
Model	ANTARIS 4
Category	GPS
Language	English