LoRa USB Dongle PCB Design

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I need a compact USB dongle that can both send and receive LoRa data on the European 868 MHz band, all while relying on a built-in PCB antenna—no external connectors. The job covers the full hardware cycle: schematic capture, PCB layout, antenna tuning, a clean Bill of Materials, and ready-for-manufacture Gerbers. USB should enumerate as a standard serial or CDC device so any computer can treat the dongle as a simple COM port; feel free to choose a proven bridge such as an STM32 with native…

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