Antenna Matching Circuit - Nokia 9000i Service Manual

After Sales
Technical Documentation

Antenna matching circuit

The purpose of the antenna matching circuit is to transform the antenna
feedpoint impedance to 50 ohm, which is the nominal impedance of the
antenna cable. The matching circuit consists of a series inductor and
capasitor and shunt inductor in GSM and series inductor and shunt
inductor in PCN. The antenna matching circuit has its own ground area
connected to the braid of the antenna cable. Antenna ground and digital
ground are not connected together at the UIF Module.
Amendment 1 04/97
RAE/RAK–1N
UIF
Page 4– 13