Reference Circuit Design For Passive Antenna; Reference Circuit Design For Active Antenna - Quectel SC200L Series Hardware Design

6.3.1. Reference Circuit Design 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 32: 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 2 dB, it is recommended to add an external LNA circuit for better GNSS
receiving performance, and place the LNA close to the antenna.

6.3.2. Reference Circuit Design for Active Antenna

The active antenna is powered by a 56 nH inductor through the antenna's signal path. The common
power supply voltage ranges from 3.3 V to 5.0 V. 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.
ANT_GNSS
Module
Figure 33: Reference Circuit Design for GNSS Active Antenna
SC200L_Series(Dual-band Wi-Fi)_Hardware_Design
U1
C3
LNA
C4
NM
3V3
C1
1uF
C3
R2
0R
C4
C5
100pF
NM
NM
Smart Module Series
Passive
Antenna
C1
C2
NM
Active Antenna
R1
C2
10R
100pF
L1
56nH
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