User's Manual
Table Of Contents
Cinterion
®
ALAS6A-US Hardware Interface Overview
2.2 GSM/UMTS/LTE Antenna Interface
22
ALAS6A-US_HIO_v00.130a 2016-09-28
Confidential / Preliminary
Page 15 of 40
2.2 GSM/UMTS/LTE Antenna Interface
The ALAS6A-US GSM/UMTS/LTE antenna interface comprises a GSM/UMTS/LTE main an-
tenna as well as a UMTS/LTE Rx diversity/MIMO antenna to improve signal reliability and qual-
ity
1
. The interface has an impedance of 50. ALAS6A-US is capable of sustaining a total
mismatch at the antenna 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 ALAS6A-US PCB and should be placed in the host application, if the antenna
does not have an impedance of 50
.
Regarding the return loss ALAS6A-US 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 2: Return loss in the active band
State of module Return loss of module Recommended return loss of application
Receive >
8dB > 12dB
Transmit not applicable >
12dB
Idle <
5dB not applicable