Recommended Circuit For Passive Antenna; Recommended Circuit For Active Antenna - Quectel Smart LTE Module Series Hardware Design

Table 38: Pin Definition of GNSS Antenna
Pin Name Pin No.
ANT_GNSS 134
GNSS_LNA_EN 202
Table 39: GNSS Frequency
Type
GPS
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 39: 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 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
SC650T_Hardware_Design
I/O
AI
DO
Frequency
1575.42± 1.023
1597.5~1605.8
1561.098± 2.046
R1
ANT_GNSS
C4 0R
NM
Module
Description
GNSS antenna Interface
LNA enable control
Passive
Antenna
C1
C2
NM
Smart LTE Module Series
SC650T Hardware Design
Comment
50Ω impedance
For test purpose only.
If unused, keep it open.
Unit
MHz
MHz
MHz
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