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FIBOCOM SU806 Series Hardware Guide
Page 60 of 86
For GNSS passive antenna, it is recommended to add an 82nH indictor near antenna connector
to improve GNSS antenna’s ability of resist ESD. For better ability of resist ESD, please choose
TVS that junction capacitance less than 0.5pF, recommended type: ESD9D5U, with 0.5pF
junction capacitance and 5.0V embedded voltage.
4.3.2.2
Active Antenna Reference Design
The power of the active antenna is fed from the antenna's signal line through a 56nH inductor. Common
active antennas supply power from 3.3V to 5.0V. The active antenna itself consumes very little power, but
requires a stable and clean power supply. It is recommended that a high-performance LDO be used to
power the antenna.
The active antenna reference circuit is shown in the following figure:
Module
ANT_GNSS
33pF
GNSS_Antenna
0R
NC
NC
VDD_3.3V
1
0
0
pF
10R
56nH
1
uF
Figure 4-4 GNSS active antenna reference design
4.4
Antenna Requirement
SU806D-EAU series module provides four antenna interfaces: main, diversity, WIFI/BT and GNSS. The
antenna requirements are as follows:
Table 4-8 Antenna requirements
SU806D-EAU Series Module Antenna Requirement
Standard
Antenna Requirement
GSM/WCDMA /LTE
VSWR: ≤ 2
Gain (dBi) ≤ 3
Max input power (W): 5
