MeiG Smart product technical information
SLM758
Hardware Design Guide
Page 61
4.18.3 GPS Antenna
The module provides the GNSS antenna pin RF_GPS. The antenna on the user's main board
should be connected to the antenna pin of the module using a 50-ohm characteristic microstrip
line or strip line.
The LNA is integrated inside the module.
To improve GNSS reception performance, customers can use external active antennas. The
recommended circuit connections are as follows:
Figure 4.38: Connecting Active Antennas
4.18.4 WiFi/BT antenna
The module provides the WiFi/BT antenna pin RF_WIFI/BT. The antenna on the user's
motherboard should be connected to the antenna pin of the module using a 50 ohm microstrip
line or strip line.
In order to facilitate antenna debugging and certification testing, an RF connector and
antenna matching network should be added. The recommended circuit diagram is as follows:
Figure 4.40: WiFI_BT antenna interface connection circuit
In the figure, R301, C301, and C302 are antenna matching devices, and the specific
component values can be determined after the antenna factory debugs the antenna. Among
them, R301 defaults to 0R, C301 and C302 do not paste by default.
