Recommended Circuit For Passive Antenna; Recommended Circuit For Active Antenna - Quectel SC20 Series Hardware Design

Table 44: GNSS Frequency
Type
GPS/Galileo
GLONASS
BeiDou

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.
Figure 33: 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), 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 56 nH inductor through the antenna's signal path. The common
power supply voltage ranges from 3.3 V to 5.0 V. Despite its low power consumption, the active antenna
still requires stable and clean power supplies. Therefore, it is recommended to use high-performance
LDO as the power supply. A reference design for GNSS active antenna is shown below.
SC20_Series_Hardware_Design
Frequency
1575.42 ±1.023
1597.5–1605.8
1561.098 ±2.046
Smart Module Series
Unit
MHz
MHz
MHz
82 / 133