Choose a DC-DC converter with low switching frequency
The input and output line of the DC-DC converter should be far away from the antenna. Note: all power supplies should also be far away from the antenna
The antenna should be far away from the LCD, especially the FPC of the LCD.
The antenna and RF trace should be far away from the main CPU, including the SDRAM and flash. It is recommended to add EMI filters at the high-speed line of the CPU, SDRAM and flash
Use the shielding case to cover the CPU, SDRAM, flash and DC-DC converter
The antenna should be far away from the SIM card
Ensure that the enclosure surrounding the antenna and structural components are not made of metal
As the enclosure and components surrounding the embedded antenna will influence the RF performance, it is strongly recommended to provide the device to the antenna vendor to optimize antenna performance. Quectel provides the document for your reference
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