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FIBOCOM FG621-LA Series Hardware Guide
Page 45 of 57
FG621-LA series module Main Antenna Requirements
LTE Band 4(2100): 450 MHz
LTE Band 5(850): 70 MHz
LTE Band 7(2600): 190 MHz
LTE Band 12(700): 48 MHz
LTE Band 13(800): 21 MHz
LTE Band 28(700):100 MHz
LTE Band 66(2100): 490 MHz
LTE Band 40(2300): 100 MHz
Impedance
50
Input power
> 25dBm average power for WCDMA & LTE
Standing wave ratio
recommended
≤ 2:1
7.4.2 Antenna Reference Design
The antenna is a sensitive device and is easily affected by the external environment. For example, the
position of the antenna, the space it occupies, and the surrounding ground all may affect antenna
performance. In addition, the RF cable connecting the antenna, and the position of the fixed antenna also
may affect antenna performance. The three-way antenna of FG621-LA series module adopts the pad-out
way. It is recommended that clients use the U.FL-R-SMT-1 antenna connector and the matching RF
adapter cable. Figure 7-1 is the reference circuit design for the main and diversity antennas:
1.5nH
0
Ω
NC
NC
NC
NC
Module
ANT_MAIN
ANT_DIV
Main Antenna
DIV Antenna
Figure 7-1 Reference circuit for main and diversity antennas
Note:
All matches must be placed close to the antenna to make sure the characteristic impedance of
transmission cable is 50Ω.