CONFIDENTIAL 12
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2005-06-08
3.5 RF-interface
An external GPS antenna (active or passive) can be connected to the HPM103H-6 using
the RF-input line. A 50 ohm PCB stripline is needed on the motherboard, see figure
below for example layout.
Figure 8 Example of RF interface layout on customer PCB
The width of the 50ohm stripline is dependent of the PCB material and thickness. On
FR4 material the width [W] (at 1.5GHz) is roughly 2 times the thickness [H] of the PCB.
If the PCB thickness is for example 0.8mm then the width of the stripline should be
1.6mm and so on.
W
H
GND plane on lower PCB layer
Figure 9 Stripline widths versus PCB thickness
HPM103H-6
