Reproduction forbidden without Fibocom Wireless Inc. written authorization – All Rights Reserved.
FIBOCOM NL668-EAU-MiniPCIe-10 Hardware User Manual
Page 41 of 56
Radiation pattern 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*10mm wide*100mm long.
Antenna radiation direction: Omni_directional.
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.
Recommended antenna gain ≤2.5dBi.
6) Interference
In addition to the antenna performance, other interferences on the PCB also may 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 as far as
possible away from the antenna, and make the appropriate isolation and shielding, or filtering on the path.
7) Antenna parameter requirements
Module main antenna requirements
Frequency range
It must use the most suitable antenna to adapt to the relevant band
Bandwidth
（
GSM/EDGE
）
GSM900: 80 MHz
GSM850: 70 MHz
GSM1800(DCS): 170 MHz
Bandwidth (WCDMA)
WCDMA band I (2100): 250 MHz
WCDMA band V (850): 70 MHz
WCDMA band VIII (900): 80 MHz
Bandwidth (LTE)
LTE band 1(2100): 250 MHz
LTE Band 3(1800): 170 MHz
LTE Band 5(850): 70 MHz
LTE Band 7(2600): 190 MHz
LTE Band 8(900): 80 MHz
LTE Band 20(800): 71 MHz
LTE Band 28(700): 100 MHz
LTE band 38(2600): 50 MHz
LTE band 40(2300): 100 MHz
LTE band 41(2500): 100 MHz
