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FIBOCOM NL668-LA Series Hardware Guide
Page 48 of 61
NL668-LA series module main antenna requirements
Bandwidth (LTE)
LTE band 1 (2100): 250 MHz
LTE band 2 (1900): 140 MHz
LTE Band 3 (1800): 170 MHz
LTE Band 4 (2100): 440 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
Impedance
50
Ω
Input power
> 33dBm (2 W) peak power GSM
> 23dBm average power WCDMA & LTE &TD-SCDMA&CDMA&EVDO
Standing wave ratio
recommended
≤ 2:1
7.5.2 Antenna Reference Design
Antenna is a sensitive device, susceptible to the external environment. For example, the size of the
module, the location of the antenna, the space it occupies, and the surrounding ground all may affect
antenna performance. In addition, the RF cable connect with antenna, and the location of the fixed
antenna also may affect its performance. NL668-
LA series module’s three antenna all led by welding
plate. recommended clients use the U.FL-R-SMT-1 antenna connector and corresponding match
adapter cable. Figure 7-1 is reference design of main antenna and diversity antenna.