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FIBOCOM SC138-
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Series Hardware Guide
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Figure 3-28-2 Reference circuit of GNSS active antenna
The power supply of the active antenna is fed by 56 nH inductance from the signal line of the antenna.
The common active antenna supplies power for 3.3 V–5.0 V.
The power consumption of active antenna is very small, but the power supply is required to be stable
and clean. It is recommended to use LDO with high performance to power the antenna. The gain of
active antenna is required to be < 17 dB. If the gain is > 17 dB, it is necessary to use the reserved π type
matching to increase the attenuation network.
3.23
Antenna Requirements
SC138 series modules provide four antenna interfaces: master set, diversity, WIFI/BT and GNSS. The
antenna requirements are shown in the following table:
Table 3-25 Antenna requirements
SC138SC138 Series Modules Antenna Requirements
System
Antenna Requirements
WCDMA/LTE
Standing wave ratio: ≤ 2
Gain (dBi): 1
Maximum input power (W): 5