User Guide

CCS Technical Documentation System Module
NPM-2NX
Issue 1 07/02 ãNokia Corporation Page 63
Antenna
The main antenna is an internal dual resonance PIFA-antenna. The antenna gain is 0 dBi
in both bands.
EMC
RF shielding on NPM-2NX is achieved by 2 rectangular surface mounted metal shields
with clip on lids. This approach is technically effective and allows the RF implementation
to progress without critical dependencies on the plastic cover development.
One shielded area contains the Tx blocks: upconverter, PA, power detector module, RF
and IF filters and the LB duplexer. The other contains the RF ASIC, Rx filters, VCTCXO and
synthesizer components. Outside are the high band LNA, upper band duplexer and
diplexer.
Considerable care has also been taken to minimise coupling between lines and to mini-
mise radiation. There is a flooded ground on layer 3, and in the RF area most of layer 8 is
flood ground. Hot vias have been kept to a minimum by using blind vias between layer 1
and 2
Radiated spurious emissions, Receiver
Definitions, methods of measurements and spec limits are defined in IS-137 and GSM1900
standard standards. Some highlights:
Table 36: Radiated spurious emissions, Receiver
Conducted spurious emissions, Receiver
Definitions, methods of measurements and spec limits are defined in IS-137 and J-STD-
007 standards. Some highlights:
UHF LO Phase Noise -117 dBC/Hz at 60 kHz for
AMPS
-122 dBc/Hz at 120 kHz for
TDMA LB
-117 dBc at 400 kHz
-130 dBc at 1600 kHz
Frequency/MHz
Specification limit/dBm
IS137
Specification limit/dBm
GSM1900 standard
25-70 -45 -57dBm
70-130 -41 -57dBm
130-260 -41-32 -57dBm
174-260 -32 -57dBm
260-470 -32-26 -57dBm
470-2000 -21 -57 / -47dBm