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FIBOCOM NL668-LA Series Hardware Guide
Page 47 of 61
It is recommended to use linear polarization.
4) Radiation pattern
Radiation p
attern refers to the antenna’s electromagnetic field strength in the far field in all directions.
Half-wave dipole antenna is the most suitable terminal antenna. For built-in antenna, PIFA antennas or
IFA antennas are recommended:
Antenna area: 6mm high x 10mm wide x 100mm long.
Antenna radiation direction: Omni_directional (all direction).
5) Gain and directivity
Antenna directivity refers to the electromagnetic field strength of electromagnetic wave in all directions.
Gain is a collection of antenna benefits and antenna directivity.
6) Interference
In addition to the antenna performance, other interferences on the PCB also affect the performance of
the module. In order to ensure the high performance of the module, interference must be controlled.
Suggestions: For example, LCD, CPU, FPC cable, audio circuit, power supply should be away from the
antenna as far as possible, and make the appropriate isolation and shielding, or filtering on the path.
7) Antenna index requirements
Table 7-6 Main antenna requirements
NL668-LA series module main antenna requirements
Frequency range
It must use the most suitable antenna to adapt to the relevant frequency band
Bandwidth (WCDMA)
WCDMA band 1 (2100): 250 MHz
WCDMA band 2 (1900): 140 MHz
WCDMA band 5 (800): 70 MHz
WCDMA band 8 (900): 80 MHz
