User's Manual

Cinterion
®
ALS6A-E Hardware Interface Overview
4 Antenna Interfaces
27
 ALS6A-E_HIO_H_v01.270a 2015-03-10
Confidential / Released
Page 26 of 36
4 Antenna Interfaces
4.1 GSM/UMTS/LTE Antenna Interface
The ALS6A-E GSM/UMTS/LTE antenna interface comprises a GSM/UMTS/LTE main 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
. ALS6A-E 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 ALS6A-E PCB and should be placed in the host application, if the antenna does
not have an impedance of 50
.
Regarding the return loss ALS6A-E 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 9: 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