Gemalto M2M GmbH ALS1-US Manual Do Utilizador

®

4 Antenna Interfaces



ALS1-US_HIO_v01.000

2013-08-14

Confidential / Preliminary

Page 24 of 34

The ALS1-US GSM/UMTS/LTE antenna interface comprises a GSM/UMTS/LTE 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



. ALS1-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 ALS1-US PCB and should be placed in the host application, if the antenna does 

not have an impedance of 50



.

Regarding the return loss ALS1-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 

 for details on how to configure antenna settings. 

Return loss in the active band

Receive

> 8dB

> 12dB

Transmit not 

applicable 

> 12dB

Idle

< 5dB

not applicable