User Instructions

BG2-E/BG2-W Hardware Interface Overview
4 Antenna Interface
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BG2_HIO_v01.000 Page 19 of 30 2010-8-30
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4 Antenna Interface
The RF interface has an impedance of 50. BG2-E/BG2-W is capable of sustaining a total mis-
match at the antenna lines without any damage, even when transmitting at maximum RF pow-
er.
The external antenna must be matched properly to achieve best performance regarding radi-
ated power, DC-power consumption and harmonic suppression. Matching networks are not in-
cluded on the BG2-E/BG2-W PCB and should be placed in the host application.
Regarding the return loss BG2-E/BG2-W provides the following values:
The connection of the antenna or other equipment must be decoupled from DC voltage. This
is necessary because the antenna connector is DC coupled to ground via an inductor for ESD
protection.
Table 8: Return loss
State of module Return loss of module Recommended return loss of application
Receive >
8dB > 12dB
Transmit not applicable >
12dB
Idle <
5dB not applicable