User's Manual

Cinterion
®
EHS8 Hardware Interface Overview Page 21 of 43
EHS8_HIO_v02.770 2014-08-11
Confidential / Preliminary
2.2 RF Antenna Interface
24
2.2 RF Antenna Interface
The RF interface has an impedance of 50 . EHS8 is capable of sustaining a total mismatch
at the antenna line without any damage, even when transmitting at maximum RF power.
The external antenna must be matched properly to achieve best performance regarding
radiated power, modulation accuracy and harmonic suppression. Antenna matching networks
are not included on the EHS8 module and should be placed in the host application if the
antenna does not have an impedance of 50 .
Regarding the return loss EHS8 provides the following values in the active band:
Table 3: 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