Gnss Antenna Interface - Quectel BG95 Series Hardware Design

In order to ensure RF performance and reliability, the following principles should be complied with in RF
layout design:
 Use impedance simulation tool to control the characteristic impedance of RF traces as 50Ω.
 The GND pins adjacent to RF pins should not be designed as thermal relief pads, and should be fully
connected to ground.
 The distance between the RF pins and the RF connector should be as short as possible, and all the
right angle traces should be changed to curved ones.
 There should be clearance area under the signal pin of the antenna connector or solder joint.
 The reference ground of RF traces should be complete. Meanwhile, adding some ground vias around
RF traces and the reference ground could help to improve RF performance. The distance between
the ground vias and RF traces should be no less than two times the width of RF signal traces (2*W).
For more details about RF layout, please refer to document [4].

5.2. GNSS Antenna Interface

The following tables show the pin definition and frequency specification of GNSS antenna interface.
Table 29: Pin Definition of GNSS Antenna Interface
Pin Name Pin No.
ANT_GNSS 49
Table 30: GNSS Frequency
Type
GPS
GLONASS
Galileo
BeiDou
A reference design of GNSS antenna interface is shown as below.
BG95_Hardware_Design
I/O Description
AI GNSS antenna interface
Frequency
1575.42±1.023
1597.5~1605.8
1575.42±2.046
1561.098±2.046
LPWA Module Series
BG95 Hardware Design
Comment
50Ω impedance
Unit
MHz
MHz
MHz
MHz
60 / 80