User's Manual

Cinterion
®
AGS2-E Hardware Interface Overview
5 Antenna Interfaces
31
 AGS2-E_HIO_v00.021 2014-03-20
Confidential / Preliminary
Page 28 of 40
5 Antenna Interfaces
5.1 GSM Antenna Interface
The RF interface has an impedance of 50. AGS2-E is capable of sustaining a total mismatch
at the antenna pad without any damage, even when transmitting at maximum RF power.
The external antenna must be matched properly to achieve best performance regarding radi-
ated power, modulation accuracy and harmonic suppression. Antenna matching networks are
not included on the AGS2-E module and should be placed in the host application.
Regarding the return loss AGS2-E provides the following values in the active band:
Table 11: 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