User's Manual

Bluegiga Technologies Oy
Preliminary – information subject to change
Page 18 of 27
A transmission line impedance calculator, such as TX-Line made by AWR, can be used to approximate the
dimensions for the 50 ohm transmission line. Figure 15 shows an example for two different 50 ohm
transmission lines.
FR4,ε
r
=4.6
Prepreg,ε
r
=3.7
W=0.15mm
h=0.076mm
G=0.25mm
GNDstitchingvias
RFGROUND
RFGROUND RFGROUND
RFGROUND
FR4,ε
r
=4.6
h=1mm
W=1.8mm
MICROSTRIP
CPWGround
Figure 15: Example cross section of two different 50 ohm transmission line