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6.3.1. Recommended Circuit for Passive Antenna
GNSS antenna interface supports passive ceramic antennas and other types of passive antennas. A
reference circuit design is given below.
ANT_GNSS
Module
Figure 43: Reference Circuit Design for GNSS Passive Antenna
NOTE
When the passive antenna is placed far away from the module (that is, the antenna trace is long) and the
external loss is more than 2dB, it is recommended to add an external LNA circuit for better GNSS
receiving performance, and the LNA should be placed close to the antenna.
6.3.2. Recommended Circuit for Active Antenna
The active antenna is powered by a 56nH inductor through the antenna's signal path. The common power
supply voltage ranges from 3.3V to 5.0V. Although featuring low power consumption, the active antenna
still requires stable and clean power supplies. It is recommended to use high performance LDO as the
power supply. A reference design of GNSS active antenna is shown below.
SC66_Hardware_Design
C1
R1
C4
0R
C2
NM
NM
Smart LTE Module Series
SC66 Hardware Design
Passive
Antenna
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