(57) In this radio set filtering solution, all passive filtering elements in the transmission
and reception branch are combined as an integrated filtering unit (25). The active
radiofrequency components (11, 14, 17, 30) are connected to the ports of the filtering
unit directly without separate impedance matching networks, since the impedance of
the ports is adjusted so that it is correct for the internal connections of the filtering
unit. The filtering unit may contain a duplex filter (25a, 25b), in which case it
is connected directly to the antenna (21). Also, by adjustment of the antenna port,
a separate antenna-impedance matching network inside the filtering unit is avoided.
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