Gemalto M2M GmbH EHS6-A 사용자 설명서
Cinterion
®
EHS6-A Hardware Interface Overview
Page 20 of 41
EHS6-A_HIO_v02.770
2014-08-13
Confidential / Preliminary
2.2 RF Antenna Interface
22
2.2
RF Antenna Interface
The RF interface has an impedance of 50
. EHS6-A 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 EHS6-A module and should be placed in the host application if the
antenna does not have an impedance of 50
are not included on the EHS6-A module and should be placed in the host application if the
antenna does not have an impedance of 50
.
Regarding the return loss EHS6-A 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