User's Manual

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EHS6-A Hardware Interface Overview Page 20 of 41

 EHS6-A_HIO_v02.770 2014-08-13

Confidential / Preliminary

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

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