Gnss Antenna Interface - Quectel EC21 Series Hardware Design

5.2. GNSS Antenna Interface

The following tables show the pin definition and frequency specification of GNSS antenna interface.
Table 27: Pin Definition of GNSS Antenna Interface
Pin Name Pin No.
ANT_GNSS 47
Table 28: GNSS Frequency
Type
GPS/Galileo/QZSS
GLONASS
BeiDou
A reference design of GNSS antenna is shown as below.
NOTES
1. An external LDO can be selected to supply power according to the active antenna requirement.
2. If the module is designed with a passive antenna, then the VDD circuit is not needed.
EC21_Hardware_Design
I/O Description
AI GNSS antenna
Frequency
1575.42± 1.023
1597.5~1605.8
1561.098± 2.046
VDD
GNSS
Antenna 10R
47nH
NM
Figure 36: Reference Circuit of GNSS Antenna
Confidential / Released
0.1uF
Module
100pF
ANT_GNSS
NM
LTE Module Series
EC21 Hardware Design
Comment
50 ohm impedance
Unit
MHz
MHz
MHz
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