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8 Use of GPS & GLONASS Antennas
8.1 Connecting a GPS & GLONASS antenna to the GPS &
GLONASS receiver
The ANT pin is used to connect a GPS&GLONASS antenna to the receiver. The
design of the antenna connection has to be done strictly according to RF design
rules. A 50 Ω PCB strip line is required. The following drawings shall explain the
guidelines. A major rule is to keep the strip line as short as possible. Additionally,
antenna ground (ANT_GND) should be routed to the ground plane of the PCB (the
ground plane is on a lower PCB layer) by vias as demonstrated in the drawing.
Motherboard Bottom Layer
GPS Receiver
ANT_GND
Vias to Top Layer
GPS receiver solder pads
In order to achieve the impedance of 50 Ω, the width of the strip line needs to be
calculated. It depends on the thickness or height of the PCB layer (both parameters
are shown in following drawing). For the calculation, it is assumed that the PCB
material is FR4.
V1.0-Mar-14
Top view
ANT_INT
Figure 14: Antenna connector strip line A5100-A
User's Manual
Motherboard Top Layer
50Ωstrip line
GPS Receiver
ANT_GND
ANT_INT
Vias to GND Layer
Page 29 of 43
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