Specifications

Cinterion
®
EHS5-E/EHS5-USR4 Hardware Interface Overview
2.2 RF Antenna Interface
28
 ehs5_hio_v04.000 2019-01-16
Confidential / Preliminary
Page 19 of 46
2.2 RF Antenna Interface
The RF interface has an impedance of 50. EHS5-E/EHS5-USR4 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 radi-
ated power, modulation accuracy and harmonic suppression. Antenna matching networks are
not included on the EHS5-E/EHS5-USR4 module and should be placed in the host application
if the antenna does not have an impedance of 50
.
Regarding the return loss EHS5-E/EHS5-USR4 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