Gemalto M2M GmbH BGS5 Manuel D’Utilisation

®

3.13 RF Antenna Interface

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EHSxT_BGS5T_HIO_v01

2014-02-26

Confidential / Preliminary

Page 32 of 41

An external RF antenna is connected via the Java Terminals’s female SMA connector that is 
also the antenna reference point (ARP).

Figure 9:  Antenna connector

The system impedance is 50

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. In any case, for good RF performance, the return loss of the 

customer application’s antenna should be better than 10dB (VSWR < 2). Java Terminals with-
stand a total mismatch at this connector when transmitting with power control level for maxi-
mum RF power.

Inside the Java module an inductor to ground provides additional ESD protection to the anten-
na connector. To protect the inductor from damage no DC voltage must be applied to the an-
tenna circuit.

For the application it is recommended to use an antenna with an SMA (male) connector:

Please note that the terminal should be installed and operated with a minimum distance of 
20cm between the antenna connected to the terminal and any human bodies. Also, the trans-
mitter must not be co-located or operating in conjunction with any other antenna or transmitter.
The allowed maximum antenna gain (including cable loss) for stand-alone situation is given be-
low in 

.

Table 14:  Allowed maximum antenna gain (including cable loss)

EHS6T-USB/EHS6-LAN

3.42dBi

4.18dBi

9.64dBi

2.51dBi

15.54dBi

BGS5T

2.15dBi

2.15dBi

2.15dBi

2.15dBi

na

EHS5T

na

6.10dBi

12.30dBi

na

12.30dBi