What are the design considerations when using embedded antenna?

  1. Choose DC-DC converter with low switching frequency.

  2. The input and output line of DC-DC converter should be far away from antenna. Note: All Power Supplies should be far away from antenna.

  3. Antenna should be far away from LCD, especially the FPC of LCD.

  4. 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 CPU, SDRAM and FLASH.

  5. Use the shielding case to cover the CPU, SDRAM, FLASH and DC-DC converter.

  6. Antenna should be far away from the SIM card.

  7. Please ensure that the enclosure surrounding the antenna and structural components are not metal materials.

  8. As the enclosure and components surrounding the embedded antenna will have influence on the RF performance, it is strongly suggested to provide the device to the antenna vendor to optimize the antenna performance. Also Quectel provides the document <Antenna_Design_Notes> for your reference.