Harsh-environment IoT gateways—used in industrial automation, outdoor base stations, energy systems, mining networks, and smart transportation infrastructure—operate under extreme thermal stress and wideband RF loading. These platforms demand stable impedance, low-loss transmission, and high-temperature RF reliability to maintain continuous connectivity across Sub-6 GHz, C-Band, and mmWave IoT communication channels. Multilayer HF PCB architectures, built with...


