Gemalto M2M GmbH ALS3-USR4 ユーザーズマニュアル
Cinterion
®
ALS3-US R4 Hardware Interface Overview
5.1 GSM/UMTS/LTE Antenna Interface
34
ALS3-USR4_HIO_v03.915
2017-03-27
Confidential / Preliminary
Page 32 of 44
5.1.2.2
Routing Example
Interface to RF Connector
shows a sample connection of a module‘s antenna pad at the bottom layer of the mod-
ule PCB with an application PCB‘s coaxial antenna connector. Line impedance depends on line
width, but also on other PCB characteristics like dielectric, height and layer gap. The sample
stripline width of 0.33mm is recommended for an application with a PCB layer stack resembling
the one of the ALS3-US R4 evaluation board shown in
width, but also on other PCB characteristics like dielectric, height and layer gap. The sample
stripline width of 0.33mm is recommended for an application with a PCB layer stack resembling
the one of the ALS3-US R4 evaluation board shown in
. For different layer stacks the
stripline width will have to be adapted accordingly.
Figure 9: Routing to application‘s RF connector
Figure 10: ALS3-US R4 evaluation board layer table
e.g.
ANT_
MAIN
MAIN
G N D
G N D
Edge of module PCB
Stripline (50 ohms) on top
layer of evaluation board from
antenna pad to module edge
Width = 0.33 mm
E.g., U.FL antenna
connector
50 ohms microstrip line
G N D
G N D
Ground connection