User's Manual

BGS2-E/BGS2-W Hardware Interface Overview
4 Antenna Interface
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BGS2_HIO_v01.300 Page 19 of 29 2011-03-08
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4 Antenna Interface
The RF interface has an impedance of 50Ω. BGS2-E/BGS2-W is capable of sustaining a total
mismatch at the antenna lines 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 BGS2-E/BGS2-W module and should be placed in the host application if
the antenna does not have an impendance of 50Ω.
Regarding the return loss BGS2-E/BGS2-W provides the following values in the active band:
Table 8: 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