Cinterion
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ALAS5 Hardware Interface Overview
2.2 GSM/UMTS/LTE Antenna Interface
32
ALAS5_HIO_v00.030a 2019-04-01
Confidential / Preliminary
Page 24 of 50
2.2.1 Antenna Installation
The antennas are connected by soldering the antenna pads (ANT_MAIN, ANT_DRX_MIMO,
ANT_GNSS) and their neighboring ground pads directly to the application’s PCB.
The distance between the antenna pads and their neighboring GND pads has been optimized
for best possible impedance. To prevent mismatch, special attention should be paid to these
pads on the application’ PCB.
To prevent receiver desensitization due to interferences generated by fast transients like high
speed clocks on the external application PCB, it is recommended to realize the antenna con-
nection line using embedded Stripline rather than Micro-Stripline technology.
For type approval purposes (i.e., FCC KDB 996369 related to modular approval requirements),
an external application must connect the RF signal in one of the following ways:
•Via 50
coaxial antenna connector (common connectors are U-FL or SMA) placed as close
as possible to the module's antenna pad.
• By soldering the antenna to the antenna connection line on the application’s PCB (without
the use of any connector) as close as possible to the module’s antenna pad.
• By routing the application PCB’s antenna to the module’s antenna pad in the shortest pos-
sible way.
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