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 23 of 50
2.2 GSM/UMTS/LTE Antenna Interface
The ALAS5 GSM/UMTS/LTE antenna interface comprises a GSM/UMTS/LTEmain antenna as
well as a UMTS/LTE Rx diversity/MIMO antenna to improve signal reliability and quality
1
. The
interface has an impedance of 50
. ALAS5 is capable of sustaining a total mismatch at the an-
tenna interface without any damage, even when transmitting at maximum RF power.
The external antennas must be matched properly to achieve best performance regarding radi-
ated power, modulation accuracy and harmonic suppression. Matching networks are not in-
cluded on the ALAS5 PCB and should be placed in the host application, if the antenna does
not have an impedance of 50
.
Regarding the return loss ALAS5 provides the following values in the active band:
1. By delivery default the UMTS/LTE Rx diversity/MIMO antenna is configured as available for the module
since its usage is mandatory for LTE. Please refer to [1] for details on how to configure antenna settings.
Table 4: Return loss in the active band
State of module Return loss of module Recommended return loss of application
Receive >
8dB > 12dB
Transmit Undefined mismatch >
12dB
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